AIYIMA D03 Bluetooth 5.0 Digital Power Amplifier 150W x 2 Stereo HiFi 2.1CH with Sub Class D Amp USB DAC Optical Coaxial OLED Support AptX 24Bit/192kHz : �鶹��.ca: Electronics

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AIYIMA D03 Bluetooth 5.0 Digital Power Amplifier 150W x 2 Stereo HiFi 2.1CH with Sub Class D Amp USB DAC Optical Coaxial OLED Support AptX 24Bit/192kHz

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144 ratings

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Item dimensions L x W x H	18 x 12.8 x 4 Centimetres
Voltage	32 Volts
Manufacturer	AIYIMA
Maximum supply voltage	36 Volts (DC)
Minimum supply voltage	24 Volts
Mounting type	Coaxial,Plug Mount
Brand	AIYIMA
Number of channels	2
Output power	1.5E+2 Watts
Package type	Box

About this item

Use classic TAS5548 + TAS5624 power amplifier chip,Max output power is 150W+150W, load 4Ohm speaker, Let you enjoy Stereo Hi-Fi Music
Bluetooth uses QCC3034 chip, version 5.0, supports ACC SBC APT-X and APT-X LL APTX-HD lossless transmission, low frequency output is specially designed to connect active subwoofer, it is very easy to build a 2.1 channel system
Bluetooth, PC-USB, Optical, Coaxial, RCA Audio input,Multiple input options to meet your different needs,Perfectly compatible with most home audio equipment, such as mobile phones, computers, tablets, TVs, TVs, MP3, CD players, etc
With treble and bass adjustment of ±12 dB and EQ effect, the sound is more delicate, compact and powerful internal layout,to ensure HiFi clear and pure sound, exquisite appearance and with LED Large display screen and remote control design bring you different enjoyment
Package including a remote control that infrared adjust the inputs mode/volume/bass/treble/EQ/mute/loudness setting ect,With 32V/5A power supply, it is enough to drive most desktop/bookcase/desktop/ceiling/outdoor/floor-type speakers

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Product details

Is discontinued by manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 18 x 12.8 x 4 cm; 1 kg
Date First Available ‏ : ‎ July 14 2021
Manufacturer ‏ : ‎ AIYIMA
ASIN ‏ : ‎ B098QSPJJG
Item model number ‏ : ‎ D03
Country of origin ‏ : ‎ China

�鶹�� Rank: #126,118 in Electronics (See Top 100 in Electronics)
- #609 in Audio Component Amplifiers

Customer Reviews:
144 ratings

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From the brand

AIYIMA AUDIO

Explore the infinite possibilities of the HiFi world

Product Description

Bluetooth Version	QCC3034 Bluetooth 5.0 support: ACC, SBC, aptX, aptX-LL, APTX-HD
PC-USB/opt/coa sampling rate	24bit/192khz
PC-USB operating system	Win 10 / Max OS/MAC/Linux/Mobile OTG
Signal to noise ratio	93db
Tonal gain (treble and bass)	±14
Input sensitivity	0.775V
Frequency response	20-20Khz (±1.25db)
Subwoofer output level	2.1V

Total harmonic distortion	0.001% (1kHz 1w)
Speaker impedance	4-8Ω
Output power	150W*2 (4Ω load) 36V, 6%THD+N
Input mode	RCA/Bluetooth/PC-usb/optical/coaxial
Support equipment	mobile phones, tablets, computers, MP3, TV, etc
Output mode	passive speaker, active subwoofer speaker
Working power supply	DC24v-36V(DC32V 5A power recommended)

RCA Audio output

Meet most of the home audio speakers, you can use the RCA banana head output, you can also use bare wire connection, practicality

Unique and Amazing design

This hifi digital Power amplifier add a OLED display screen,Easy to view, simple and beautiful when enjoy HiFi music

Multiple input methods

Bluetooth/PC-USB/Optical/Coaxial/RCA Audio inputs,Multiple input options to meet your different needs

Add Active Subwoofer Output

The D03 power amplifier with active subwoofer output,which forms 2.1 channel home theater system

Tips for Using the AIYIMA D03 DAC Bluetooth Amplifier

1.Computer system below WIN10 need download the drivers!(Contact me for it, or go to our Official-website to load).

Above WIN10 and Apple System don't need it.if have pops in speaker when using BT connection.

Android user try change the Bluetooth AVRCP version to 1.5 or 1.6 (rather than the default 1.4)

2.The OPT input only support SPDIF two channel sound, doesn't support TOSLINK 5 channel surround sound.

3.The optical fiber cannot be folded;The audio cable and PC-USB cable should not be too long, so as not to affect the output of the signal.Thanks!

Note:If no audio output when you connect TV,you need to adjust the TV audio source output to optical fiber, coaxial output.

Pay attention to switch to the corresponding input mode.

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Kevin
Great Amp for a remote, secondary system
Reviewed in Canada on October 1, 2022
Verified Purchase

I'm using this amp to power bookshelf speakers on my patio. I stream either from my main stereo using a bluetooth tramsmitter, or from my phone or tablet. I use the AptX HD codec, which sounds pretty good. AptX Low Latency is also available. The amp does not support LDAC, but _may_ support AAC for iPhone users. (cannot test this)

The advertised 130 watts is not usable power, unless you like high distortion! The same measuring methodology is used by all similar amps though, so it is not deceptive or inaccurate. I would guess it provides 30 to 40 watts of clean power into the 8 ohm speakers I have. This is PLENTY for normal listening with reasonably efficient speakers. Remember that doubling the power only provides a small (3db) volume increase, so moderate volumes do not need high power.

The construction is not fancy, but is solid. The speaker banana jacks work well, and the inputs look good, though not using any. The sub-woofer output is nice to have, though also not using that. The external power brick it's pretty hefty. If pushing the amp hard, it might be worthwhile replacing this with something bigger & better, but I don't have any power issues. The remote is compact and includes bass & treble controls, which is handy.

I cannot comment on its audiophile sound quality. I did not hook this up to my main system, so have only heard it with budget speakers on my balconey! However, I think this amp could work well in a starter or secondary sound system. The internal DAC seems decent for Bluetooth streaming. I don't know how the analog inputs sound, if planning to use an external DAC or phono-amp. There are sound reviews out there if want that level of info.

Overall this tiny amp is exactly what I needed and expected, so I'm very pleased with it. Hopefully it will work well for many years.

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Kevin

Great Amp for a remote, secondary system

Reviewed in Canada on October 1, 2022
I'm using this amp to power bookshelf speakers on my patio. I stream either from my main stereo using a bluetooth tramsmitter, or from my phone or tablet. I use the AptX HD codec, which sounds pretty good. AptX Low Latency is also available. The amp does not support LDAC, but _may_ support AAC for iPhone users. (cannot test this)

The advertised 130 watts is not usable power, unless you like high distortion! The same measuring methodology is used by all similar amps though, so it is not deceptive or inaccurate. I would guess it provides 30 to 40 watts of clean power into the 8 ohm speakers I have. This is PLENTY for normal listening with reasonably efficient speakers. Remember that doubling the power only provides a small (3db) volume increase, so moderate volumes do not need high power.

The construction is not fancy, but is solid. The speaker banana jacks work well, and the inputs look good, though not using any. The sub-woofer output is nice to have, though also not using that. The external power brick it's pretty hefty. If pushing the amp hard, it might be worthwhile replacing this with something bigger & better, but I don't have any power issues. The remote is compact and includes bass & treble controls, which is handy.

I cannot comment on its audiophile sound quality. I did not hook this up to my main system, so have only heard it with budget speakers on my balconey! However, I think this amp could work well in a starter or secondary sound system. The internal DAC seems decent for Bluetooth streaming. I don't know how the analog inputs sound, if planning to use an external DAC or phono-amp. There are sound reviews out there if want that level of info.

Overall this tiny amp is exactly what I needed and expected, so I'm very pleased with it. Hopefully it will work well for many years.

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Sebastian
Great versatile option for the price
Reviewed in Canada on February 2, 2023
Verified Purchase
I almost bought the A07 for my vinyl setup, but given all the many inputs and versatility that the D03 offers, the choice was clear.
First of all, the sound quality is really good, there's also no power on pop sound, and the low level noise is almost zero. Build quality is nice, and the buttons have a good touch to them.
This ended up being a great soundbar replacement, using the optical in for TV, aux input for the vinyl player and an occasional phone Bluetooth play. The sub output also made it a good deal since I used it to immediately upgrade my system.
When it comes to power, I have never used more than half to stand just behind the line of being "that neighbour". In apartment and condo settings this will be plenty.
The bass and treble settings are quite effective, the maximum and minimum limits have a big impact on the sound, and are helpful for removing the bass from spoken youtube videos or streams, for example.
There are some cons:
Every time the optical source changes the sample rate there's a dip in the sound, and it mutes for like half a second, this can be annoying sometimes when watching a movie (like one or two times in one movie), normal soundbars can do this flawlessly.
The remote feels scarily cheap, especially because there's no replacement, it's not for sale. Anywhere.
The screen is illegible from a normal tv watching distance, you do most of the settings by guessing.
Apart from that, this is a really good deal.

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Sebastian

Great versatile option for the price

Reviewed in Canada on February 2, 2023
I almost bought the A07 for my vinyl setup, but given all the many inputs and versatility that the D03 offers, the choice was clear.
First of all, the sound quality is really good, there's also no power on pop sound, and the low level noise is almost zero. Build quality is nice, and the buttons have a good touch to them.
This ended up being a great soundbar replacement, using the optical in for TV, aux input for the vinyl player and an occasional phone Bluetooth play. The sub output also made it a good deal since I used it to immediately upgrade my system.
When it comes to power, I have never used more than half to stand just behind the line of being "that neighbour". In apartment and condo settings this will be plenty.
The bass and treble settings are quite effective, the maximum and minimum limits have a big impact on the sound, and are helpful for removing the bass from spoken youtube videos or streams, for example.
There are some cons:
Every time the optical source changes the sample rate there's a dip in the sound, and it mutes for like half a second, this can be annoying sometimes when watching a movie (like one or two times in one movie), normal soundbars can do this flawlessly.
The remote feels scarily cheap, especially because there's no replacement, it's not for sale. Anywhere.
The screen is illegible from a normal tv watching distance, you do most of the settings by guessing.
Apart from that, this is a really good deal.

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Thomi
Makes for a very good computer desktop 2.1 Chanel audio system
Reviewed in Canada on July 16, 2022
Verified Purchase
Note the amp sounded very poor out of the box. I spent some worth while time to find the best input ( in my case it turned out to be the USB input from my iMac) I also had to go into the iMac settings and set the output to 192 Khz from the DAC the default setting was only 48Khz. Once I did that I only had to adjust Treble and Base to +2 db and it sounds very nice and 'warm' especially playing lossless audio and all my digitised albums. Might also mention there is no audible noise in the background when there are quiet or silent patches in an audio track. VERY pleased with this amp for the price. Makes a very good computer desktop audio system with a Pair of Kanto Yaro2 speakers and a Paradigm Active Subwoofer.

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2 people found this helpful

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Not_there_yet
Amazing customer service
Reviewed in Canada on May 3, 2023
Verified Purchase
I like this product a lot. I unfortunately had a little problem with it where it wouldn’t connect to the Bluetooth after a few months, but the company was very quick to respond, and also sent me a replacement incredibly fast. Excellent customer service and communication, and also a wonderful product that I’m very happy with.

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�鶹�� Customer
Great Amp
Reviewed in Canada on January 17, 2023
Verified Purchase
Well worth the wait to get this amp. YouTube gives this amp a high rating and so do I.

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Oliver B.
Por el precio y el tamaño: excelente
Reviewed in Mexico on July 18, 2024
Verified Purchase

Hasta ahora..ha funcionado de maravilla el mini amplificador
Es pequeño de tamaño..pero suena de verdad muy muy bien
Y si le pones un subwoofer activo...el sonido es espectacular 👌

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Norman B. Bernstein
Surprisingly good
Reviewed in the United States on May 10, 2024
Verified Purchase
I wanted to upgrade my audiovisual setup in my new house, and needed a small stereo amp, with just three specific features: an optical input, a subwoofer output, and a usable remote control for at least volume. After scouring the �鶹�� website, I settled on the Aiyima D03. While I have had mixed results when buying electronics from an unknown mainland China manufacturer, this product was the simplest one available with the right combination of features. I wanted the optical input, because my entire signal chain is digital: HDMI from the BluRay DVD/CD player, into the Samsung TV, out via the TV's optical port, through a Bluetooth transmitter (for using Apple AirPods), and then out to the amp. I also needed the subwoofer output to drive an existing powered speaker, and finally, the remote volume control was also mandatory. The product also supports Bluetooth, although I won't be using that.

This product fit the bill perfectly, and I have been very pleasantly surprised by it. The D03 is truly tiny; the cord-bump power supply is actually bigger than the amp. While it has a volume knob and input selection controls, the remote provides that, along with bass and treble controls, input selection, and more. When I connected it to my Klipsch bookshelf speakers, I got excellent sound performance, and completely quiet operation, no noise or hum.

The amp features a nice graphic display which unfortunately, and owing to the tiny size of the amp, cannot be read from more than a few feet away. No matter, in my application, I really don't need to see it, since I'll only be using the optical input.

The product came with a Bluetooth antenna (which I won't be using) and an optical cable, but without the necessary AAA batteries (x2) needed for the remote.

Despite the five star rating I'm giving this product, no product is absolutely perfect, and I do have a minor criticism or two. The binding posts for the speaker outputs are really tiny, and a challenge to use with my stubby fingers. They also won't work well with heavy gauge speaker wire, so it makes sense to use 18 ga. or smaller wire, and abandon the myth that speaker cable gauge has anything to do with sound quality, especially with nearby bookshelf speakers. The instruction guide is also rather minimal, albeit sufficient.

Class D amp design, something which I did professionally until my retirement, is truly amazing, in terms of reducing the size and weight of amplifiers. While class D amps have their challenges, they have the advantage on not needing massive amounts of iron and copper for transformers, as well as big heatsinks. As for the power output, I never believe the power rating claims of manufacturers like these, because they never specify the conditions for such a test. However, suffice it to say that the amp is far more powerful than it needs to be, to drive the Klipsch bookshelf speakers.

Of course, since I only just installed this amp 24 hours ago, reliability will be my chief concern, and I would reserve the right to edit my review, should things go pear-shaped. However, once past the infancy failure stage, audio electronics can run for a very long time; I once had a Technics receiver in my office which remained turned on continuously for well over 20 years, until it finally failed. We'll see if Aiyima holds up as well.

UPDATE: I've had this product since last May, and bought a second one for my daughter in August. I'm knocking off one star, for a couple of small problems in both that might be annoying to users. First, the IR remote control has a particularly weak output... it requires pointing the remote directly at the amplifier, and unless there's a clear and direct view, it often fails to work. Second, the volume control, via the remote, is difficult to use; each 'step' results in a very small volume change, so it takes a lot of clicks to meaningfully raise or lower the volume.

Aside from those two issues, I still consider it to be an excellent product.

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granger
Preferred D05 over D03
Reviewed in the United States on March 31, 2023
Verified Purchase
The first thing to understand about either of these is that they are dac-amps. When you are using digital inputs the signal stays digital all the way through except for the final output to the speakers. There are just a few amps that work this way but as digital inputs become the most common sources this is truly ideal because you are avoiding both dac adc conversions when using a digital amplifier - and you don't need a high end dac to get good sound. The downside is that the analog input must go through an analog digital conversion and that is not a strong point of this amp. So as you read others' comments its critical to know what inputs they used. And, of course, bluetooth is not hifi either.

I will say that using the digital inputs both of these are truly excellent. I have had many amps including an Aiyama A07, Sabaj A10, Hypex digital, several tube amps, and several class AB amps. In terms of top to bottom detail both the Hypex and D03/D05 are standouts. I did not find the Aiyama A07 as good in soundstage and 'rhythm'. The high end of the Sabaj felt more digital, a bit harsher and flat.

But don't forget that dac's can make a huge difference. I have some high end dac's including an RME and Marantz DAC1 so I know what a decent dac should do. The precision, imaging, and soundstage you get from D03/D05 are competitive.

I highly doubt there's a significant power difference between them despite the specs since they both provided the same power supply (same as the A07 also). They had more power than I could use with the KEF Q100's I was driving. Sound of the two were very similar with the top end feeling a bit more lively with the D05. Both provide an exciting, detailed sound that felt 3d with the instruments suspended in space.

I like the aesthetics and creature comforts of the D05 much more, however. It's a bit lower, longer, and narrower with a larger volume knob and more space for the speaker posts on the back. When you change settings the display changes so that you can see what's changed from a distance. There's a loudness contour that's useful at low volumes. And you can blank out the screen if you want. I haven't found any use for the eq settings. Note that a long press on the display button switches to hi gain which is about the same gain as the D03. Overall, the D05 is worth a few extra bucks.

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Olver
Lo mejor por el precio... no lo ouedo creer
Reviewed in Mexico on April 8, 2023
Verified Purchase
Cabe en tu mano...y no esperas mucho de él
Error
Es un mega ampli que te va a hacer bailar
Genial!

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Mike Duskis
Excellent, but requires days to warm up
Reviewed in the United States on August 8, 2022
Verified Purchase
Aiyima D03: 30 day review

I'm writing this review now because I wish someone had written it months ago. It contains some facts that weren't obvious to me and may not be obvious to you. It also contains some subjective impressions. They are my own. I've had no contact with the seller or any other party with a financial interest in your purchasing decision.

I'll start with the bottom line so you can skip the rest if you'd like. The Aiyima D03 is an excellent amp but it's not a good fit for everyone. You're most likely to enjoy it if the following statements are true about you:
* You're looking for a stereo (two channel) amplifier for a small to mid-sized room.
* You are moderately picky about sound quality.
* You listen mainly to digital audio sources.
* You don't already have a favorite DAC that you expect to pair with your new amp.
* You are prepared to be extremely patient as your new amp warms up.

The Basics

The Aiyima D03 is a Class D integrated amplifier. I'll explain those terms in case you're unfamiliar with them.

"Class D" is a relatively new amplification strategy that relies on electronic switches to do most of the work and consequently can acheive much higher efficiency than the previously dominant "AB" class. This efficiency is why the Aiyima D03 is so much smaller than competing products like the (also excellent) Sony STRDH190 and Yamaha R-S202. The main difference between the classes lies in how much power they require and how much heat they generate. Class D amps don't necessarily sound better or worse than Class AB amps. As with many things in life, the outcome depends a great deal on the details.

All amplifiers amplify sound. Integrated amplifiers also provide some kind of conversion or processing. The exact kind will vary from one model to another. In the case of the D03, you'll find a bluetooth receiver and a DAC that allows you to connect digital audio sources (coaxial, optical, USB) directly to the amp. Like simple ("power") amplifiers, the D03 also allows you to connect an analog (RCA) source.

Power

Here's where comparison shopping gets tricky. Manufacturers usually advertise an amplifier's power in terms of watts-per-channel. This might lead you to the obvious conclusion that a 100 WPC amp will produce twice the sound volume of a 50 WPC amp. Obvious, but not even close to correct. First, WPC will vary dramatically with the resistance (ohms) of your speakers. Some manufacturers (like Yamaha) assume 8 ohm speakers. Others (like Aiyima) assume 4 ohm speakers. This prevents a straightforward comparison. Second, the relationship between watts and decibels is not linear. Each watt you add produces only a third of the volume that the previous watt did. You can learn the gritty details by researching speaker sensitivity and amplifier power. Or you could take my word for it and accept that the D03 has more than enough power to drive most bookshelf speakers deep into hearing damage territory. Don't let the small size fool you.

Alternatives to Consider

The price gives you some idea about how Aiyima positioned the D03 relative to its competition. It's in line with the previously mentioned Sony SDRDH190 and Yamaha R-S202, both fine, basic, entry-level class AB integrated amplifiers. It's priced considerably higher than the Pyle PDA6BU which offers comparable features but also introduces much more harmonic distortion and noise. On the opposite boundary, you can find an array of high end integrated amplifiers from makers like Yamaha, Denon/Marantz, and Onkyo with prices that start a couple of hundred dollars more than the D03 but quickly reach well into the stratosphere. The law of diminishing returns applies. You get to decide how much you are willing to pay for that next nibble of improved fidelity.

Aiyima isn't the only manufacturer of class D integrated amplifiers on �鶹��. For example, Fosi Audio produces good stuff and has a few options, all priced below the D03. You can draw your own conclusions about why each seller chose to price their products as they did.

If you listen only to analog sources or have your own DAC, the highly rated Aiyima A07 power (non-integrated) amplifier may be a better bet. As I'll describe under "subjective impressions," I see analog input as a weakness of the D03.

Subjective Impressions

At the end of all the technical terms and numbers, the only thing that really matters is how your stereo system sounds to your ears in your room. Some of the more detailed reviews include information about who is listening and what other equipment is involved. You might find this tedious to read but it ends up making a huge difference to your understanding of the product because you are different from me and I am different from the next reviewer.

I classify myself as a "discerning listener" rather than an "audiophile." I developed my ear through many years of playing musical instruments and editing audio files. On the other hand, I lack the inclinaton or patience to squeeze every last drop of fidelity out of my stereo system. I've never upgraded an op-amp. My usual standard is "sounds pretty good to me."

Here's how I like to think about the sound quality of a stereo system. You start with the quality of the original source. Then you subtract all of the distortion and noise from each component and each connection between them. In other words, an awful amplifier can make great speakers sound awful but the reverse isn't true. A great amplifier can't make awful speakers sound great. Your stereo system can sound no better than its worst component, and will almost certainly sound worse. I raise this point here because it's unfair to blame bad sound on your amplifier unless you have done the hard work of eliminating all of the other possible causes. Don't forget the connections and interactions between components.

I set the D03 up in my home office. I attached it to a pair of Polk S15 "Signature Series" bookshelf speakers, plus an Acoustic Audio PSW-6 subwoofer under my desk. The equipment is just a notch above entry-level. It's "pretty good" but won't win any audiophile competitions. The subwoofer connected to the designated RCA port on the D03 and had its crossover dialed all the way down to 50 Hz. This is not the best way to establish a speaker/subwoofer relationship but it's simple and acheived the "pretty good" sound I was going for. It also tested the D03's subwoofer output. My primary audio source is Spotify via a Macbook. It's connected to the USB port on the D03 and configured to play at 96 kHz. I found a volume of 15-20 (out of 100) to be plenty loud for my ears.

To test sound systems, I often use "Toota Lute" from Mannheim Steamroller's Fresh Aire II. It contains some back-and-forth between a guitar and a harpsichord. I can learn quite a bit from how distinct the strings sound and how well they resonate (or don't). To my astonishment, the noise coming out of the D03 setup was positively dreadful. The strings were wrapped in wax paper and stuffed down a drain pipe. Any resonance could be attributed to a plumbing accident. After fiddling with wires for a few minutes and accomplishing nothing, I remembered a D03 review which mentioned that it "came alive" after a few days. I thought the author meant that the sound went from "pretty good" to "great" so didn't pay much attention. Lacking better ideas, I kept the D03 powered on and walked away. Two hours later, I thought it sounded marginally better but couldn't tell for sure. Maybe I was fooling myself. The next day, the improvement was remarkable but I still wasn't impressed with the sound. It took an entire week of gradual progress before I started to feel good about what I was hearing. I threw challenging pieces at it from every genre I knew and had to strain my ears to detect faults. Without reservation, I can call this D03 system "pretty good."

I intended to keep using the USB port but also experimented with the others, mainly so I could mention them in this review. The optical port sounded excellent. At the same smaple rate, I couldn't detect any difference from the USB. Bluetooth sounded like bluetooth. It wouldn't be my first choice or even my third, but it worked. I found the analog (RCA) inputs to be the only disappointment. Switching from a digital source to an analog one resulted in a volume significant enough to be annoying. Even at equivalent volumes, the sound was flat and lifeless to my ears.

Wrap-up

This review starts with my bottom line so I won't belabor the point here. I like the D03 quite a bit and intend to keep it for years. If you remember only one thing from this review, I hope it's this: before you pass judgment on this amplifier, let it warm up for several days. I realize how crazy this statement is in our post-vacuum tube world, but solid state components have temperatures too.

[Update 9 Nov 23: Ejected After 16 Months]

After sixteen months of near-daily use, the D03 no longer graces my office. It didn't break and it surprised me only once, but that discovery was a doozy. In my initial evaluation, I noted a significant volume difference between analog and digital sources. I played only digital sources and forgot about this quirk -- until I got annoyed with the uneven discrete volume control and attempted to hack around it by attaching an external DAC. This hack required the analog inputs and led to truly atrocious noises pouring out of my "pretty good" speakers. After a bit more experimentation, here's what I learned:

1. Volume control is uneven. I landed in a state where 10 was too loud, 1 was about the same, and 0 worked as advertised. Discrete volume control is a challenging feature to implement. A simpler, continuous design would have served the budget D03 better.

2. Sound quality from analog sources is worse than you'd expect from a simple low-budget power amp. �鶹�� carries dozens of them.

3. The integrated DAC (TI TAS5548) performs admirably. I expect you would have trouble finding a superior DAC for less money than you would spend on the entire D03.

Bottom line: Think of the Aiyima D03 as a "good-enough" DAC with a built-in amplifier. It's a portable headphone amp for your speakers. Don't try to use it like a power amp and you'll get along fine.

In case you're curious, I replaced the integrated D03 with separates. A HiFime S2 DAC feeds an Aiyima A07. The S2 is a better DAC and the A07 is a better amp, so the same old speakers produce a richer and fuller sound. Because the S2 was designed for headphones, its analog output is louder than power amps generally expect. I mitigated this tension by sticking an adjustable attenuator between the two components. Switching to separates opens all kinds of possibilities if you're willing to get some wiring dirt under your fingernails. If you're like most people and just want to play digital audio through your speakers, the D05 remains a "pretty good" option. For this reason, I'll let my original four-star rating stand.

Still here? Let's talk about the Aiyima D05 for a moment. It's easy to think "5 is bigger than 3, so the D05 must be newer or better." Easy and reasonable but completely wrong. On paper at least, the D03 is the better amp because it contains better/newer TI chips. I didn't bother with a real-life side-by-side sound comparison. It would be fun to see one.

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