First off, don't mean to offend anybody or stir the proverbial pot. This is just an account of me finally finding the perfect amp for powering my Polk's !
I am not advocating using just any pro amp with Polk's, this review regards only the Crown Drivecore XLS series. The S/N ratio is a respectable 103db as long as you use the 1500, 2000, or 2500 version. The cheapest version the 1000 has the least power and a 97db S/N ratio.
Harmon Intl. owns Crown and this drivecore tech has already trickled into Lexicon amps [another Harmon company].
Was running two Nakamichi PA7s to power both pairs of my SDA SRS's, but they seemed like they were being held back.
Switched then to Adcom GFA 5500s and even tried Adcom GFA 555s - still just sounded restrained. So then I tried two Carver TFM 55s - better, but still room for improvement.
And yes, these amps had all been recapped and were in good working order.
After searching around online, came across this thread - Very informative and explains most every question you might have about these amps used in a home setup.
After reading it, I went out today and bought 1ea Crown 2500 amp from Guitar Center - the listed price was 599.00, but they will price match and indeed matched a 548.00 price from the internet.
So what does 548.00 get you for a power amp ?
1. 440 WPC X 2 into 8 ohms or 775 WPC X 2 into 4 ohms
2. .5% THD & 2ohm stable
3. RCA & XLR input connections with binding post outputs.
4. They are common ground amps !
5. 10.75lb weight per amp & rack mountable.
BEST OF ALL - The sound quality and ability to drive these speakers the way MP intended. Will be buying several more of these amps soon.
IMO - these are a steal and so far are the best sounding and most neutral amp I have ever heard.
I ran mine tonight pretty hard, it never even got warm, the fan never cycled after almost two hours of use at above THX reference levels.
Will post pics of my setup soon, just thought others here might realize how under appreciated these amps are for home use.