novisnick
EmoPhile
CEO Secret Monoblock Society
Posts: 27,223
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Post by novisnick on Apr 15, 2017 11:20:06 GMT -5
I have never heard the XPA-1L but I have owned both generations of the XPA-1's and I could not decipher any audible difference in Class A vs. Class A/B. The only difference was in Class A the amp got a lot warmer. I wouldn't be surprised if you are using no more than 5 or 10 watts with your Klipsch speakers. Hence the amps will always operate in class A so you wouldn't really listen the amp in class A/B. Every A/B amp has class A operation even if it is 1 watt. My Klipsch speakers run on a single AAA battery each! 😂
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Post by teaman on Apr 15, 2017 11:58:53 GMT -5
I have never heard the XPA-1L but I have owned both generations of the XPA-1's and I could not decipher any audible difference in Class A vs. Class A/B. The only difference was in Class A the amp got a lot warmer. I wouldn't be surprised if you are using no more than 5 or 10 watts with your Klipsch speakers. Hence the amps will always operate in class A so you wouldn't really listen the amp in class A/B. Every A/B amp has class A operation even if it is 1 watt. Actually my XPA-1's are paired with my Infinity SM 152's. They are 102db efficient so basically the same deal, just a larger woofer.
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Post by saru on Apr 15, 2017 15:11:20 GMT -5
Thanks, Keith, for clearing up my misconception about the two operating modes. I was under the impression that flipping the toggle switch to A-mode meant that the amp would only operate in Class A and never switch to Class A/B. Now it makes more sense to me that the toggle determines the transition point between A and A/B, and I can see how one would want to run the amp in A-mode. My 2ch listening habits (small room, sitting about 6.5 feet from loudspeakers, low-to-moderate volume levels) would probably be ideal for A-mode, for instance. I'll have to do some listening comparisons sometime, though it's likely that my volume levels in A/B-mode are low enough that it'd be Class A power anyway, so I probably won't hear a difference.
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Post by leonski on Apr 15, 2017 16:36:43 GMT -5
I wouldn't be surprised if you are using no more than 5 or 10 watts with your Klipsch speakers. Hence the amps will always operate in class A so you wouldn't really listen the amp in class A/B. Every A/B amp has class A operation even if it is 1 watt. Actually my XPA-1's are paired with my Infinity SM 152's. They are 102db efficient so basically the same deal, just a larger woofer. 102db sensitive speakers? You'll NEVER get out of class 'A' should you decide to run 'em that way.
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Post by qdtjni on Apr 15, 2017 16:44:19 GMT -5
Actually my XPA-1's are paired with my Infinity SM 152's. They are 102db efficient so basically the same deal, just a larger woofer. 102db sensitive speakers? You'll NEVER get out of class 'A' should you decide to run 'em that way. It would just be 117 dB and your out of class A.
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Post by leonski on Apr 15, 2017 17:36:25 GMT -5
Doesn't anyone GET it? The transition from A to A/B is NOT a 'brick wall'. Many measureables play a part, from speaker characteristics to line voltage to the amp to even some temperature sensitivity. Don't forget OSHA. Something like 15 MINUTES for 115dba. That's a WEIGHTED average SPL. 85db for an 8 hour day. The 'exchange' rate is 3db which halves the exposure time. From WEBMD: www.webmd.com/brain/tc/harmful-noise-levels-topic-overview1 watt continuous into your 102db sensitive speakers would be good for a very short time, per OSHA standards. And given a 10db crest factor for 10x the power? 3.5 watts into those same speakers would be QUITE more than most persons could stand.
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Post by teaman on Apr 15, 2017 17:39:38 GMT -5
Doesn't anyone GET it? The transition from A to A/B is NOT a 'brick wall'. Many measureables play a part, from speaker characteristics to line voltage to the amp to even some temperature sensitivity. Don't forget OSHA. Something like 15 MINUTES for 115dba. That's a WEIGHTED average SPL. 85db for an 8 hour day. The 'exchange' rate is 3db which halves the exposure time. From WEBMD: www.webmd.com/brain/tc/harmful-noise-levels-topic-overview1 watt continuous into your 102db sensitive speakers would be good for a very short time, per OSHA standards. And given a 10db crest factor for 10x the power? 3.5 watts into those same speakers would be QUITE more than most persons could stand. What?....I couldn't hear you, I worked in a stamping plant for eight years on a 2700 ton press line...
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Post by qdtjni on Apr 15, 2017 17:42:11 GMT -5
Leon, relax, it was a joke! Hence the smiley.
Cheers
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Post by leonski on Apr 15, 2017 18:09:10 GMT -5
Sense of humor has vanished. Trouble is, many users get wrapped around the wrong axle.
Just to take an example which is of little actual importance. For a while 'back than', many requests were made for the full data measurements of various amps. EMO made the mistake of publishing all that stuff and there was a feeding frenzy of people comparing and analyzing to death. Even though most are ill equipped to deal with that kind of information or know how the various pieces relate. In so doing? Some stuff got ignored which may have been important or was NOT reported.
I'd have settled for a few different measurements and even stuff that NOBODY reports, like an amps performance into a REAL speaker.
Have fun. My blood sugar is low and I'm heading out for dinner. Maybe some Tempura will restore me?
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