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

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.

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).

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.

I wanted to find a mono amplifier for my old Velodyne subwoofer. I had bypassed the power supply and internal amp when they both failed. I wanted to free up an old 220w Kenwood for my surround speakers. The sub worked with the speaker cone directly connected to the amp, via the wire terminals. This product arrived with no instructions nor could I find any on their website. I connected the sub out from my Denon receiver and I wired this amp to the sub and turned it on. It worked for maybe ten minutes and then speaker cone began banging again the frame basket. Douk audio customer service was Totally inadequate! They repeatedly said that they could not understand my hookup to the sub. I tried using another speaker and had the same results! I did not even get to raise the volume and the speaker began banging loudly. The product was defective and I told them this several times! THEY DID NOT! Offer to replace it. I’m returning this amp as soon as possible! By the way, Fosi products look exactly like DoukAudio amps.

I looked long and hard for a subwoofer amp, but couldn't find one with the right combination of features. That is, until I found this amp. The instructions are easy to understand, and the craftsmanship looks like expensive higher end equipment. I also like that I can plug in my headphones in to the amp itself, so I don't have 25ft of headphone cable connected to my stereo. I work way too much, and needed to be incentivized to stay in bed a little longer... This is the perfect addition to my existing equipment.

The power supply that came with unit was bad. Fortunately I had one that worked. Bad quality control.

I have an old 10" powered Kenwood subwoofer. Speaker went out a few years back. I replaced that with a car audio Kicker sub. Then about 4 months ago the amp went out. Bought this amp, drilled a hole in the back of the Kenwood sub, hooked up the Kicker, siliconed the drill hole around the wires and it works amazing! Louder than original. Actually have to use the power level on this at around 40%. Have it in my home gym, around 600 square feet and it sounds amazing. Will pick up another once my upstairs amp goes out.

Works really good along with my old Kenwood receiver. The addition of a subwoofer makes my old sound systems shine!!!! Now it is 2.1 system! This little amp is compact and enough to drive my 6" passive subwoofer. I just have it cranked halfway and is more than enough to bring those sub-frequencies up to par with the music. Enjoying my music with a new perspective thanks to this little guy. When you get it, don't forget to put the switch in bass mode. Recommended unit!!!!

Tenía un equipo de sonido Onkyo con subwoofer pasivo, hace poco lo reemplacé por uno nuevo que sólo tiene salida para subwoofer activo, mi subwoofer anterior aún servía, así que decidí comprar este adaptador y funcionó a la perfección.

I two of these have this paired with topping E30 dac, L30 headphone/pre-amp and a pair of old Kef 60S on my desk, one per channel obviously. Much stronger bass / mid-range and improved sound stage compared to my old little class d amp (75W). Separation is improved and crosstalk is pretty much eliminated with this set-up. Definitely Hi Value Hi Fi!

Bought this awhile ago and wanted to give it some trial time before posting feedback. This was replacing my previous subwoofer preamp. It still working great. No hums like my last one. I have it set pretty low level, but it can get pretty high.

Funciona muy bien con un subwoofer de 200 whats , el filtro para subwoofer funciona perfecto