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Originally Posted by Bill Valley
If you are pulling out the factory amp the SVEN4 should be perfect. The signal from the factory head unit is and RCA or line level output. The SVEN can be switched from RCA to LOC. A line level signal is will give you better sound quality than a LOC. I purchased the SVEN4 which I am currently using as a LOC to power my sub. I do intend to replace the factory amp (as soon as we get rid of this damn snow) and use the line level signal from the head unit.
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The SVEN4 just seems so cheaply made, and I have horrible engine whine after installing it. Like I mentioned in my earlier post I saw a definate improvement after switching from the SNI-35; mainly in my highs and imaging. The SNI-35 gave a muffled sound and I noticed my tweeters were just not audible with them which KILLED the sound of my system.
I have tried changing ground locations, adjusting gains, I then extended the SVEN4 about 6 ft to try mounting it in different locations. I also tried three different brands of RCA cables. No matter what I get engine whine; I can't tolerate that.