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Customer Review
- Reviewed in Canada on May 16, 2024There is a lot to like about this little amp. It is very small so it fits just about anywhere. The sound is clean, and the bass and treble adjustments make considerable adjustment for speaker/room dynamics possible. It automatically switches from line in to bluetooth when connected to a bluetooth device. Connection is easy.
The downsides: It does require a power brick so there will be phantom power draw even when the power is off. But the main issue is the power rating. It is billed as 100 watts per channel, but the power brick that comes with it is rated for 24 volts x 4.5 amps, which makes the full power available with no losses about 100 watts total, or 50 watts per speaker. That's RMS, so peak power could be higher, but it doesn't really seem big enough to house capacitors capable of delivering too much peaking. Also, when connected to an 8 ohm speaker, the maximum theoretical wattage at 24 volts would be 72 per side (but would exceed the capability of the power supply 144>100). You would need 4 ohm speakers to get to 100+ watts, but at 6 amps per side or 12 amps total, the power supply is no where near big enough. You could try providing a larger power supply, but the power input jack does not look rated for 12 amps to me.
The sound it produces at 8 ohms is sufficient to fill a small room at loud volumes, but if you compare it to a typical old school home theater unit or stereo rated at 50 watts per channel, it is noticeably quieter. I would estimate the unit as shipped used with 8 ohm speakers is delivering about 25-30 watts RMS per channel. Still, it does so cleanly and without distortion, and can drive the base at that level.
I would note that this problem exists for pretty much all the Chinese manufactured amplifiers out there. I don't know what their rating systems mean, but they aren't giving RMS. Sometimes the thing stamped on the front ("300W+300W" or something) is no more than a model number designed to be deceptive.
The secret is to check the power supply. An amp cannot deliver more RMS wattage than voltage x amperage of the power supply output, and usually delivers less (up to half) because there are losses in the amplifier itself.
All that said, I still rate this amplifier a 4/5, because it is still a good unit for the money, if something around 25-30 watts into 8 ohms or possibly 50 watts into 4 ohms RMS is what you are looking for. It is very suitable for a single room in a house or a studio monitor. But you won't be using it for an auditorium or church, which a true 100 watt (RMS) per channel stereo could handle.
