Summary: I bought this amp to replace a Alpine KTP, and to power a set of Alpine SPX-17 Pro. It is amazing. The clean power this amp delivers is unprecedented, I have never had an amp for my highs deliver so, nicely! You would think I had new speakers installed as well. I must warn you, if you have any engine noise, get it fixed prior to installing this amp. I had a tiny bit of whining, (picked up at HU) since I replaced my plugs and wires.
Summary: It is one of the best amplifier in my car......I love the look. It performance its like one of those big Amps which is very hard to install. But thses one, even u can stack them without any problem. Best Buy from eBay.
Summary: Just as advertised, this amp packs a powerful punch in a small package. There is no static I can hear (unlike some other amps I've owned), and the footprint makes it practical for even a family car. The only minus I can think of is that the Alpine quick-connect speaker plugs are not standard equipment across the market.
Summary: This amp is the best 4 channel out there! It is pushing actual 180watts RMS x 4 in a 2ohm or 4ohm load same output! Whats even greater is the amp doesn't ever get hot or even warm for that matter! I love this amp and they are even stackable and they are fanless bc I can't see one nor hear one lol.
Summary: where do i start? This amp is an expensive way to add a powerful sound system in a small place. i used this amp in a small ford ranger standard cab. I have an alpine media head unit (ipod/mp3/am-fm only) alpine pxa-h100 sound processer, (4) alpine sps-507 5x7 full range speakers, 1 alpine type s 10" sub and of course i use the alpine-pdx-4.150 amp to power everything.
Summary: I worked in the car stereo field for years and have heard and owned my fair share of different systems with different equipment. I am running Alpine SPX-F17T 3 way components and a set of SPX-F 2-way components in the rear. I first ran them off the deck and they sounded great, but lacked tight mid-bass and couldnt push the higher frequencies. I was skeptical about the PDX series amps due to there size and that they were a new line of Alpine products.
Summary: at the ebay price this top of the line alpine amp is awesome. very clear and crisp. I have mine pushing 2 alpine type s 5x7/6x8 component sets aswell as a type s 6.5 component set and they get down even with my gains like 3/4 the way up. if you get it in your local store you will pay an arm and a leg but in a good ebay store it is a steal.