Average Reviews:
(More customer reviews)I purchased this Polk Audio PA200.4 amplifier as part of an (initially) reasonably priced stereo upgrade for my 2006 Prius. However, when I received and installed the unit, I found that it introduced a noticeable (and extremely annoying) hiss into my system. This noise was present in all of my speakers (especially the tweeters) at any volume even when the amplifier wasn't connected to any inputs. Thinking that it was a problem with the particular unit that I received, I exchanged it for an identical unit and had the same issue. Eventually, I replaced this Polk amp with a nicer (and more expensive) JL Audio XD400/4 amplifier, which provided much cleaner and more powerful output in a smaller package. I understand that these amps are not directly comparable due to their price difference, but my experience has been to avoid the bottom-line amps from any manufacturer. I have been enjoying a more expensive Polk amp in my other car for the last few years, so I don't suggest that Polk amps all have this issue. However, the PA200.4 is certainly a dud in their product line. *Note: I should also mention that the coating on the rails of this Polk amp seems to corrode over time such that a white powdery finish forms at the surface. The first unit that I received had this problem worse than the second, but it was apparent in both. Although this "corrosion powder" looks like it will brush off, it is impossible to remove completely.
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