The 2004-2008 Acura TSX Signature Series Amplifier is a the last fully-analog unit which is designed to run the ELS system well. However the design of the components suffers from cost-cutting measures by the manufacturer. The 2014 units have advanced board designs and componentry over the 2nd generation models, making them awesome platforms on which to tune. It should be noted that the amplifiers are not interchangeable. It is important to verify your exact package for accurate fitment.
The elite series features upgraded operational amplifiers from general purpose to an audiophile grade chipset from Burr Brown. This will raise the floor level and expand the sound stage giving you wider, deeper and more natural dynamic range.
Another important note is that the tweeters in the TSX are driven by the amplifier, but they are sent a full-range signal. The factory tweeters house their own capacitors to filter which control the frequencies they reproduce. J. L. Kelley offers a tweeter upgrade which is optional.
What you can expect:
Increased output. There is an average of 6-8wpc increase in power output.
Your sound stage will be wider with an audible improvement in frequency range. You will notice warmer and more detailed midrange, more controlled and less "bright" high frequency range, and tighter, more authoritative bass.
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A note on speakers:
The factory Acura soundstage and imaging as designed by Elliot Schneider is impeccable. The placement and angle of each component is designed to make the greatest auditory experience possible. And as much as the amplifier tuning improves the overall sound of the system, the speakers make an even greater advancement in the overall sound quality. Look up Phantom Audio Tweeters, Drivers, and Subwoofers to bring your listening experience to an entirely new level.