Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W

I am very happy with the subwoofer amp. I had to replace my A/V receiver with one that did not have an internal subwoofer amp, and this little amp fit the bill. It works exactly like it did with my previous receiver. If you have passive woofers and your receiver does not have an internal amp for subwoofer output then I highly recommend this little amp. It comes with a crossover switch on the back (B & M). B position is for Subwoofer Mode ( 20 -200hz) M position is for full frequency (20 - 20khz).

Just received after my old power subwoofer amp seemed to put out less bass, thought I'd revive it with a new amp instead of fixing a 20 year old amp. Everything is included (amp, power supply) and all you need to do is use your own speaker wire and hook it up to your subwoofer. In my case I tested the amp with my old car subwoofer and wow...works really good! At first I was a bit disappointed at full max BUT it was because I had the wrong settings, fortunately the instructions provided were helpful. From the factory it comes in setting "M" which is for full range speakers. After I switched the mode to "B", wow, I had to turn down my volume! Pretty legit and nice unit I have here.We'll see on the durability and longevity of this unit as its only been about 2 hrs. Will update as time goes on.

If you do the obvious thing and plug this into a switched outlet on your receiver, you get an annoying thunk when you power off your receiver with this turned on. I get the same thing if I pull the plug out of the wall, so it's not my receiver. I'm also using their power brick, so a different one may not do this.I am leaving it on all the time. It probably draws less than the built in subwoofer amp it's replacing, which was always warm to the touch. Otherwise, it seems to work well.

I was a little sceptical about this subwoofer amp, due to it's small size and low price. And...I was pleasantly surprised with the sound output after installation. I recently replaced a 20 year old, Home Theater In A Box, 5.2 receiver with a new Sony 7.2 receiver. The old unit had a dedicated amplified subwoofer output, as well as a passive output for an amplified sub. I was running an older Sony powered sub (next to the media stand below the TV), as well as the passive sub that came with the HTIB (behind the couch). The new Sony unit also has 2 sub outputs, but are both passive. So, instead of spending the extra bucks on a new powered sub, I decided to give this little amp a chance. And it delivers! This old subwoofer has never sounded so good. Zero distortion or rattles. Just clean, clear, powerful bass. Actually had to turn down the volume knob to about 1/3, because it was drowning out the rear surround speakers. Well worth the money. Would be cheap at twice the price.

100 watts of clean class D amplification for your DAC’s subwoofer output. Adjustable with your favorite streamer’s phone app. Perfect!

There is definitely not 100w of output here, when my old mp3 amp this was replacing had louder output at only a claimed 30w. I returned this amp immediately and I tried their similar NS-03G under the "Nobsound" branding, and I had the same result. The unit itself looks nice, the materials and build quality are excellent - however the actual would output (the whole point of this device) is lacking.

I had to replace my previous amplifier with a new Yamaha amp but I wanted to use the existing speakers first since they are mounted on the ceiling. The only surprise I got was that my subwoofer needed a preamplifier to work with the new amplifier. I was thinking about replacing it too but came across this inexpensive alternative. Since I had nothing to loose, I ordered it and was pleasantly surprised. It worked better than I expected and I could adjust the base separately giving me more flexibility to lower or raise the amount of base depending on my mood. You can’t beat this item for the price if you have to preamp a subwoofer.

I needed the unit to preamp my subwoofer and it did a very moderate job of doing that the sound is muffled not very clear and I am not that happy with it for what I wanted to use it for if I hook up two other speakers to it and use it for a microphone maybe it will be better but I wanted to have it as a preamp for my subwoofer and it doesn't meet the standard sorry but that's what I have to say about it if you buy it don't use it as a subwoofer amp