Originally Posted by lukeamdman
IPR1600 gets some pretty good reviews for full range. Check out the review in the amplifier measurements thread.
Originally Posted by zora
Carvin's new DCM-X series seems interesting.
I've used Carvin's, *** Crest Prolite, and others for HT/Stereo speakers and can say that I really can't tell the difference between them and my "audiophile" amps.
Originally Posted by FOH
***But, if I were dabbling into the pro amp market these days, with an eye on dsp, I'd look seriously into what Crest is offering. Their new pro-lite series (whatever it's called) looks like the goods. Yeah, it's not US built like their good stuff, but their cred is solid, and if it says Crest, I'd bet it would pass the test. The real question would be their -3dB point.
The Peavey IPR/Crest ProLite would not be my first choice for driving mains. The reason is their highish output (source) impedance. I really like the ProLite 2.0 as a sub amp, though: much better looking than the IPR, no insane blue lasershow, more sturdy feel, quieter fan even stock (replacing it with a Noctua or similar is still a worthwhile endeavor if the amp is in the listening room), not significantly more expensive.
Then again, for people who want that "tube sound" coloration the IPR/ProLite may be ideal, because "tube sound" is mostly due to the output impedance. Only unlike a tube amp the ProLite is cheap, efficient, and doesn't require fiddling with biases, etc.
Then again, with the DSP version (which I've not tried) presumably one could take a listening-position measurement with an AB amp, take a listening-position measurement with the ProLite DSP, and apply filters to compensate for the source impedance.
Originally Posted by tuxedocivic
Why so much amp to run your mains? Seems a tad rediculous. Couldn't you get by with a couple hundred watts? Maybe something non-PA with unbalanced inputs, low noise floor, no fan, 12V trigger, etc. Would probably perform better.
Agreed. Also, especially in the context of multichannel music or HT systems, a stack of pro-amps generally takes up lots of space. A 5-7 channel "home" amp is usually more compact. There are exceptions, such as the 1-RU, 8-channel Crown CT8150 (also offered in a Lexicon variant, for about the same price), and the 2-RU, 8-channel amps from Ashly and ElectroVoice. (The LexiCrown and EV also have 12V triggers onboard.)
That said, the amp that has intrigued me for a while as a mains amp is the Ashly PEMA8250.
Yes, it's expensive. But it's an 8-channel Class D amp, and even if the source impedance of the Class D modules is ordinarily unacceptable, it has a DSP to fix any FR problems caused by high source impedance. Also has both RCA and balanced inputs, US made, and their logo looks a lot like Citroën's.
The main reasons I haven't bought one are no 12V trigger, and nonremoveable rack ears. As it were, having to bend the one of the inner rack-ears on my new multikilobuck ElectroVoice CPS8.5 sub amp* to fit it my audio cabinet - bays, sadly, don't fit a standard 19" rack component) was harrowing enough.
*No, haven't yet tried the EV with mains. Do plan at some point to do listening-position measurements comparing a number of Class D amps I have on hand (the ProLite and CPS 8.5, an old Panny XR55, a Hypex UCD-based amp, and one whose chipset is unknown to me) to a class AB amp of known flawless performance (ATI AT2007).
Originally Posted by carp
I just hooked up one of Jonathan's amps he let me borrow, the Crown xls 802. I've been listening for the last 30 minutes or so every once in awhile cranking it up pretty loud. I swear I can tell a difference but I'm not going to believe myself until I can do it blind.
There is some hiss which is very noticeable from a couple feet from the speakers. From my LP you can just barely hear the hiss if you have no signal and you are really listening for it. Still... I think that would bug me over time. The hiss is the same volume no matter what the master volume is set at.
Self-noise is definitely one area where otherwise competently-designed amps differ.