Hosyond D800 Bluetooth Receiver Amplifier 2.1 Channel 50W×2 + 100W Subwoofer, Hi-Res Audio Class D Amp with USB/AUX/USB Input, Bass Treble Control for Home Theater DIY Speakers

This amplifier is incredible for the price. Great quality, adjustments to output and subwoofer, multiple input types.

I used 2 Pioneer 4 way speakers and 1 8inch skar sub running off of a dewalt battery and it sounds awesome

The Hosyond D800 is a very inexpensive plate amp that includes a multitude of inputs for a self contained audio system build. As other reviewers mentioned, this appears to have been sourced specifically for Karaoke use, but the unit itself works decently as a self-contained audio amplifier and interface for a portable speaker build, a camper audio system installation, or other applications where extreme fidelity is not required.My unit worked well on Bluetooth and connected rapidly to my iphone (It was listed as D103- which doesn't match the model number). The Volume Control and Adjustment pots are firm and knobs are simply chrome plated plastic, so there's little purchase on the adjustments.The amp setup includes provisions for both DC power, as well as directly connected AC Power. I tested the board with AC Power, and it worked fine with my small bookshelf speakers. Although the advertisement shows 220w output, the breakdown is realistically 50x2 and 100x1 for the Left and Right Channel and Woofer respectively. As with most amps of this price range, i found distortion to be fairly prevalent as you increased the volume. I don't doubt the 50w rating is a "PEAK" rating, and not a realistic full output rating.Nevertheless, at only 24 dollars at the time of review-- This could make a clever all-in-one board for specific applications. It is small enough to install in many situations, it has multiple input options, and it works well on Bluetooth. 4 stars if you adjust your expectations accordingly.

I wanted to use this in my garage, so made a case for it out of 3mm acrylic (you will definitely want to put this in a box because there is high voltage on the power supply board). My case is about 275mmW x 100mmH x 100mm D, which is about the smallest case that you could use.I suspect this was intended as a replacement for cheap karaoke systems (it has two 1/4" microphone inputs with echo, which I didn't test). It even says "🎤Karaoke" on the front panel. You have to use the remote to switch between the line input, Bluetooth, and (analog) FM modes (though it'll go to Bluetooth input when a remote device connects).There is no mode display, so you have to listen to the voice prompts when you change modes. These are given in very highly accented English. There is a hard to see power LED that indicates when the amp is enabled (the physical power switch must also be on, of course). There is no FM frequency display.The subwoofer controls are crossover frequency and volume. I found that with the frequency knob fully clockwise the peak frequency was about 80Hz.The front panel says "50W+50W+100W". This is way different from the specs in the item title ("220Wx2 + 350W").I was curious about its actual performance, so I hooked it up to a 5Ω load resistor, low-distortion signal generator, and my Keithley 2015 THD (total harmonic distortion) multimeter. Using the line input with the volume control at maximum, the right channel stayed below 0.5% THD up to an output of about 35W (input 600mV RMS), then the distortion rose sharply as the wattage was increased. At 47W the distortion had risen to about 14%.Testing the subwoofer channel, I found that the distortion was about 1% at 39W, rising sharply to about 16% at 51W. At 61W the distortion was a whopping 31%.If I were to write the specifications for this amp, I would say that it was 35W/channel x 2 + 40W for the subwoofer.The build quality is OK for what it is.So: is it "HIFI"? I wouldn't say that it was. Is it "50W+50W+100W"? No. Though the R+L channels can put out 50W, the distortion is about 15% at that wattage. And the subwoofer has already got over 30% distortion at 60W (I didn't try to push it to its limits).And the specs in the item title ("220Wx2 + 350W") appear to be entirely made up.

This all worked fine on Bluetooth but on other inputs it would constantly stop playing and speak out the input or cut off completely.

Was a great find for my project. I used it to power a ported subwoofer and two four-inch coaxial speakers that I use as a TV sound bar. Hosyond builds a great and useful product.

I ordered this to use in my garage to take the place of a failing boombox with detachable speakers. Hooked up speakers to the back of the board as per instructions. Powered the unit on and I was greeted with female voice telling me it was ready to pair Bluetooth, which I did. Popped some batteries in the remote and I was able to switch between I believe it was FM, auxiliary input, and One other option which I forget what it was. I go back and check but I can't. More on that in a minute I popped in a a USB drive full of mp3s of music. And I was able to get about 30 seconds of music before I heard a loud snap and the unit decided to not work anymore.No matter what I do, I cannot get this unit to do anything now other than light up the red LED. Sometimes the LED's on solid. Sometimes it flashes slowly. Sometimes it flashes rapidly. Removing power and waiting for a while and then putting power back on again. Makes no difference. I get no voice message telling me what mode I'm in. It doesn't ask me to pair Bluetooth (which it might not because it's already paired with my phone). Basically now it's a paperweight.

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