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Post by Dark Ranger on Aug 13, 2014 12:49:17 GMT -5
Actually all our amps have a minimum of 3db of headroom with all channels driven. With only one channel driven I have measured will in excess of the 3db but I don't want to state what it was because I don't want to give people the wrong idea. Keep in mind that with only one channel driven, the full weight of the power supply is available to that one channel, so it has boat loads of headroom. Lonnie Man, there you go over-building amplifiers again. Why can't you be like other engineers and use an under-rated and pathetic power supply section with no headroom, install cheap parts throughout, and then sell the piece of crap for 3 times the normal asking price??? Where's your commitment to shoddy design and workmanship???
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bootman
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Typing useless posts on internet forums....
Posts: 9,358
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Post by bootman on Aug 13, 2014 13:42:24 GMT -5
The unit I referenced, Theater Grand, *is* a receiver. Sunfire also made separate amps, the Cinema Grand series... SCT Ah yes the old DMR-1 ...oops I meant Sunfire grand receiver.
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Post by jking on Aug 13, 2014 21:29:07 GMT -5
When Emotiva was still selling the Sherbourn PA 7-350 it was rated at 350 RMS all channels driven into 8 ohms 550 watt into 4 ohms. I bought one last year and it is a beast.
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hemster
Global Moderator
Particle Manufacturer
...still listening... still watching
Posts: 51,920
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Post by hemster on Aug 13, 2014 21:54:07 GMT -5
When Emotiva was still selling the Sherbourn PA 7-350 it was rated at 350 RMS all channels driven into 8 ohms 550 watt into 4 ohms. I bought one last year and it is a beast. Amen. Still have mine and it won't be replaced unless I win the lotería! .
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Post by sme on Aug 14, 2014 0:52:19 GMT -5
Also the lower the frequency being reproduced the more power required, RE your comment above: If I do clip, it's only on the biggest hits that land above 150 Hz or so. (?) This is not strictly true. I get a lot of help from my room for 150 Hz and below, and my subs take over at 80 Hz. In fact, in-room my speakers can do 40 Hz with about the same power as 250 Hz. Of course, I still use subs since the distortion is much less. Around 300-400 Hz, a nasty combination of reflections gives me a dip, and for frequencies above 500 Hz or so, the room becomes substantially less important, and in the treble (> 5 kHz) the speakers are essentially near-field and the "textbook" formula for calculating efficiency at the listening position is approximately correct. Kind of. See, my speakers are also more efficient and have higher impedance in the treble. That means they don't need much power to get loud, but they still demand the volts! So hopefully my XPA-5 has got 'em. So far I haven't noticed any issues.
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Post by garbulky on Aug 14, 2014 5:13:29 GMT -5
Imo the assumption that dynamic power is the most important thing is a bit off. I would look more at rated power (and sound quality) to match your needs with a little bit more assurdness. Dynamic power is just too vague imo to be useful to compare amps.
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Post by yves on Aug 15, 2014 6:59:33 GMT -5
My Cantons have several dB less speaker sensitivity than your speakers, and I am not using subs. Satellite speakers and large speakers combined with (separately powered) subs require a lot less power than large speakers that, even though they start to roll off nearly a dozen dB above 20 Hz, still provide useful output at 20 Hz, and, despite all that power mongering, enormous bass output I am getting, I can attest that my XPA-2 is in *absolute* control of my pair of Canton speakers. So much so, I actually even decided to, in manual mode of course, use the Emo-Q Gen 2 of my UMC-200 to "cheat" just a little bit, by providing a slight bump above 20 Hz in order to somewhat compensate for the speaker's rolloff curve. [ I *love* to have my cake and eat it too........].
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