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Post by palehorse on Aug 25, 2010 22:45:03 GMT -5
Ok, my LCR are each 8 ohm speakers (Polk Monitor 70s and CS2B), while my two surrounds are 4 ohms (Emotiva ERD-1's)... So, is it better to go with a single 5ch amp like the XPA-5, or should I split the duties with two amps like the UPA-2 and a XPA-3? My main concern is the mixture of 4 ohm and 8 ohm speakers...  |
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Post by Deleted on Aug 26, 2010 0:42:21 GMT -5
Don't get hung up on the impedance rating of speakers when you are using high quality amps like the Emotiva's. The impedance rating of the speakers is only a general nominal measurement specification which changes at different frequencies. Some receivers might have some problems (overheating and/or shutting down) with speakers that truly drop to 4 ohms or lower but not a strong amp like any of the Emo amps. A 4 ohm speaker has a lower resistance to electrical current than an 8 ohm speaker. Thus, a 4 ohm speaker will draw more power (current) from the amplifier than an 8 ohm speaker.
The XPA-5 will drive all 5 of your speakers simultaneously regardless of whether they are 4, 6 or 8 ohms (any mix) and remain quite cool. The 4 ohm speakers will simply draw (continuously) more power like 300 watts per channel versus 200 watts per channel for the 8 ohm speaker. The XPA-5 is a great choice for your 5 speakers.
Occasionally some high end or exotic design speakers might drop down near 2 ohms which could be a concern but not in your case.
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Post by palehorse on Aug 26, 2010 10:15:33 GMT -5
Don't get hung up on the impedance rating of speakers when you are using high quality amps like the Emotiva's. The impedance rating of the speakers is only a general nominal measurement specification which changes at different frequencies. Some receivers might have some problems (overheating and/or shutting down) with speakers that truly drop to 4 ohms or lower but not a strong amp like any of the Emo amps. A 4 ohm speaker has a lower resistance to electrical current than an 8 ohm speaker. Thus, a 4 ohm speaker will draw more power (current) from the amplifier than an 8 ohm speaker. The XPA-5 will drive all 5 of your speakers simultaneously regardless of whether they are 4, 6 or 8 ohms (any mix) and remain quite cool. The 4 ohm speakers will simply draw (continuously) more power like 300 watts per channel versus 200 watts per channel for the 8 ohm speaker. The XPA-5 is a great choice for your 5 speakers. Occasionally some high end or exotic design speakers might drop down near 2 ohms which could be a concern but not in your case. Excellent! That seems to be the consensus on the AVS forums as well, so it looks like the hunt is on for a used XPA5... woohoo! Thanks again for your continued assistance with my new build! |
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Post by moparmudder on Aug 26, 2010 12:49:23 GMT -5
I have a XPA-5 driving four Triad 4 ohm speakers and one 8 ohm center channel, no issues
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Post by slbenz on Aug 26, 2010 22:09:03 GMT -5
I have a XPA-5 driving four Triad 4 ohm speakers and one 8 ohm center channel, no issues Same here running two pairs of 4 ohm Magnepan IIIas and an 8 ohm Eminent Technology LFT-XII center channel when I had my home theater system up. The XPA-5 ran cooler than my Pioneer Elite receiver running as a preamp with its amps turned off. |
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