I purchased the JAD800.4 along with a JAD1200.1 to power my Infinity Kappa speakers and MB Quart subs. My first choice was the Infinity Kappa Five amp, but I had problems with two of them and was given a store credit. Second time around I decided to go with two amps (4/1channel) hoping for better performance / reliability.
I read a lot of mixed reviews on Class D amplifiers. Many people think that A/B has better sound quality, while others prefer the small footprint, high power / low heat output of Class D. Being an engineer I reviewed the specs and was very impressed with the signal to noise as well as the THD compared to Class A/B.
NVX is a relatively new brand so I turned to Google and found several good reviews. I was looking at the Polk amps and NVX seems to be very similar, with the controls panels and specs being almost identical (and NVX was in stock).
Out of the box the amps had a solid feel and clean look. They have a soft-start feature that powers them up a few seconds after they get power. This gives you time to start your engine without drawing any current. Very nice.
The sound quality is excellent - better than other A/B amps I had in the past. More than enough power - I haven't even cranked them all the way up yet and don't think I'll ever have to.
I have a second MB Quart 10 RLP on back order because with one sub I was getting distortion before I could feel the bass. It turns out that the Infinity Kappa Five amp was the weak link. The JAD 1200.1 pushes one sub very well.
The only negative I have to say about these amps is that the adjustment dials take a philips screwdriver, and they do not have an arrow or line showing you what it is set to. This made it a little inconvenient to tweak the crossover points.

Have a quick look at the Polk or Hertz hdp line and you will notice the similarities instantly. These amps are small, feature packed, and sound great. They sound as good as any d class I've heard and are priced well below their value. This is a no brainier.

great thing about this amp is the 0 gauge adapter made my install alot easier!

I've only had the amp hooked up for a day so far.but it seems to be built pretty sturdy.set on low setting right now till speakers are broken in good.comes with power cable gauge adapters to allow 1/0 power hookups.bass knob included which is great.amp splits internally to drop youre ohm,makes hooking multiple speakers simple.for durability im going to give it a five bc i havent really had a chance to work it hard yet but even at low settings hooked to two vcw104 it sounds great

I have this running two rockford fosgate p3sd4s at 2 ohms in my 4door 2500 hd silverado and they might not flex the windows but they sound great and hit hard when you want them too very nice amp looks good good clean bass got a good deal on it too ill never buy any where elts sonic is the best any body wondering just buy it you won't regret it

I am very happy with the amp powering 2 Alpine Type r 12". The amp pushes them enough to be clear and thump. Super simple to wire, love the remote amp level. Use it all the time, when I have people that don't like big bass. It is simple to just turn it down.

Also, contacted the company for advice. They answered me back right away, with a correct answer and a diagram. Great customer support.

This replaced my stolen Soundstream Reference 1000sx from the late 90s. So far its been good, I also purchased a RE Audio SEX12D2 and it sounds great. Dont know why people say the new re subs are no good. I've had a system in all my cars since 1997. Used all the top brands and i gotta say this amp is great. 1000 watt amps in the late 90s were usually in the $1000 range. Great deal too, in 15 years of being amazed at car stereo ive had from the beginning a 50 sanyo amp. upgraded to a hitron whitney, upgraded to LA Sound Malibu, then soundstream reference 200, Lanzar opti50. then US Amps usa150. then US Amps usa200, Kicker Si200, ppi art series300, ppi pc275, mtx 2150x rockford 500m.1,soundstream reference 1000sx and now this. its far the most powerful amp Ive had to date. Ive stopped purchasing car audio in 2002 since i had everything, but in the past 10 years prices have sure dropped a lot. Redid my entire system with current gear and the passion still lives on.

I have this amp hooked up to 2 12" alpine type r wired to 1 ohm and it makes em hit hard. i also have the sound dampening trunk kit and it is really good product thick and easy to install

Just got this to power 2 Kicker L7 10" and I'm very happy with the bass. Amp is really small and it came in handy as I saved some space compared to previous one since I put it under my seat. I got 25% off too so I can't complain. Small complaint is the LED is a little bright for my taste.

I buy this amp to push 3-10" kicker cvrs dual 2 ohm so I wire them at 1.5ohm and it does pretty good now I need a cap cause if I go over 30 in the stereo vol I can heard the weeknes on the bass! Plus my lights dim bad over all great amp!

my friend has this amp and its powerful a great buy for a low price

I got this amp a while back with 2 of the new 12" type-R and it beats them hard. Have it wired down to 2 ohm and everything in my car shakes. I'll be getting another one soon so I can run 1 to each sub for some crazy bass. Good amp never overheats wen after hours of torture (:

I bought the nvx sound deadner,AWESOME! Ive heard nvx amps arent too bad and are a huge "sleeper" for their price. I want to see nvx products bench tested because im very interested in this brand now. Everything ive seen from this company is well priced and performed my expectations just because of price. I think nvx will do good in the future we will see? I cant say anything about durability though but il giver a 5 because people i know havent complained yet so thats a good thing!

just bought this amp, recieved it in 2 days!!! All I have heard from the staff at sonicelectronix is great things about this amp, nvx is always a choice of mine and will be buying their new sub they are releasing soon to go with this amp.