Polk Audio PA D4000.4 (PAD4000.4) 800W RMS PA D Series Class-D 4-Channel Car Amplifier

I had a much expensive amplifier the one of the R series of Alpine with 6 channels!! I was only using 4 chanels cause I am an audiophile I don't care about noize, but good quality. So I decided to buy this amp for my 4 focal speakers ( 2 component and 2 full range) added a cheap DSP from Dayton audio with Aptx HD bluetooth codec capabilities and a separate subwoofer with a 1200 rms Scar subwoofer amp.The Polk sounds way better than the Alpine, amazing quality for the price and yes the watts are real not BS... This is a powerful Amp with an amazing Hifi quality.. Tweeters sound crispy and detailed and the mind range of the voices its pretty good!! Don't waste your money in more expensive amps, this old amp is powerfull and has the Hifi quality

This thing does the job in small spaces by putting out serious power. It is built well and looks clean.

great amp for a class d 4ch. i have three and two mono blocks , my favorite feature that makes me want this amp in 2022 , its been discontinued for 10 years , is the band-pass-able crossover , my first experience with this amp was two channels running 2 polk mm 6.5" component and two mm1540 woofers at 2 ohms bridged , this amp pushed the woofers to near xmax , couldnt tell it wasnt getting rms visually or audibly , and afters hours of play at high volume amps is cool and the mids never distorted or volume drop in and out when the bass gets heavy. great amp , i expanded to another 4 chn added 2 more pairs of mm 6.5 , now ive bought my third , i plan on putting all the tweeters on one amp , all the mid / high ranges on another and the mid / bass on the third . since the amps are band passable i can the mid high bandpass at 3k - 800 , and the mid bass on at 800hz - 100hz , and subs at 100hz - 10hz

I replaced my clarion amps I had on my boat for 4 years - never had an issue just looking for more power. I was surprised how hot these amps get since they are class d - after I month of use the amp keeps going into thermal protection. I called Polk and they do not warrant 3rd party sellers that are not authorized dealers. After spending 45 minutes on calls with Amazon they sent me a new one since the purchase was past 30 days. Let's see how this new one does. The sound is outstanding.

Quality unit but who ever processed this order NEVER put the amplifier in a shipping box but placed a shipping label on the actual item box!! UPDATE: I just had seen that here is an option to choose to have items shipped with the label directly on the item box or to have the item placed in a shipping box to hide the contents.... :)

I just upgraded my 2016 F150 with a decent Head unit and speakers, and felt like they needed a bit more power.This amp is compact in size but gives a nice punch to all four speakers. You can adjust its gain to fine tune the system. I like to hear my music sometimes loud, but without distortion or over modulation. This was a great choice for me.

Sounds good. Will not power a subwoofer bridged on the other two channels. Good for door speakers only.

I haven't yet installed this, but I purchased a p.1000 a while back and this one was packaged even better than the last. Good job guys I can't wait to see how this makes my system sound!!