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Deciding between 3 Yamaha Receivers

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post #11 of 21 (permalink) Old 11-28-2011, 06:08 PM
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In my experience, most of the cheaper receivers, like the ones being compared in this thread, will only increase their available output by ~66% when the resistance is cut in half TWICE, which means, less than 200WPC into 2 ohms for most ~100WPC rated receivers, even though they are rated ~100WPC into 8ohms.
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Which receivers have you seen that can provide 66% more power when load is halved?

Most of the receivers I've seen only put out maybe 30% more power.

The two most powerful receivers made in the last 10 years--the 80lb Yamaha RX-Z11 and the 97lb Denon AVR-5805--both only output 44% more power when load goes from 8 ohms to 4 ohms.


A typical receiver these days may actually produce less power into 4 ohms then 8 ohms like this Denon 1612, which only produces 70% as much power into 4ohms, and if it goes up, most only increase it by about 30-40% such as this Pioneer VSX 821.


Even power amplifiers, like this $15,000 Denon, only increase power by 49% into 4 ohms.

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post #12 of 21 (permalink) Old 11-29-2011, 01:22 PM
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and good luck finding a receiver that's actually stable into 2 ohms

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post #13 of 21 (permalink) Old 11-29-2011, 05:49 PM
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and good luck finding a receiver that's actually stable into 2 ohms

Not too hard to find those.

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post #14 of 21 (permalink) Old 11-29-2011, 08:13 PM
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I doubt that.

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post #15 of 21 (permalink) Old 11-29-2011, 08:43 PM
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The Polk Lsi series drops down to as low as 2.5 ohms in the woofer range, NHT Classics are about 4.2 ohms across the woofer band, and the Revel Ultima series run about 3.8 ohms. These are among the hardest speakers to drive recently made that I know of.

A solid 2 ohm load across the woofer band would be extremely rare and you would probably need some huge monoblocks for that.

As far as a fully 2 ohm stable receiver (capable of driving a nominal 2 ohm speaker), I can't name one off the top of my head. I don't think even think Yamaha RX-Z11 or Denon AVR-5805 could handle that without the protection circuit kicking in.

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post #16 of 21 (permalink) Old 11-29-2011, 09:05 PM
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I meant amps, like from QSC Behringer, Crown, etc. Since you would be using the pre-outs anyway if you needed that much power.

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post #17 of 21 (permalink) Old 11-29-2011, 09:21 PM
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Ah yes, pro audio power amps with dust buster tornado fans biggrin.gif

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post #18 of 21 (permalink) Old 11-29-2011, 10:03 PM
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Originally Posted by astrallite View Post

The Polk Lsi series drops down to as low as 2.5 ohms in the woofer range, NHT Classics are about 4.2 ohms across the woofer band, and the Revel Ultima series run about 3.8 ohms. These are among the hardest speakers to drive recently made that I know of.
A solid 2 ohm load across the woofer band would be extremely rare and you would probably need some huge monoblocks for that.
As far as a fully 2 ohm stable receiver (capable of driving a nominal 2 ohm speaker), I can't name one off the top of my head. I don't think even think Yamaha RX-Z11 or Denon AVR-5805 could handle that without the protection circuit kicking in.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260901106567&category=39783&_trksid=p5197.c0.m619

Something like this?

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post #19 of 21 (permalink) Old 11-29-2011, 10:11 PM
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That's a power amplifier not a receiver. If you are going to talk about power amplifiers you might as well get a pair of Emotiva XPA-1s.

http://emotiva.com/xpa1.shtm

A pair of 1200VA transformers, 1000W/channel into 4 ohms, 240,000uF of capacitance.

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post #20 of 21 (permalink) Old 11-29-2011, 10:30 PM
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Originally Posted by astrallite View Post

That's a power amplifier not a receiver. If you are going to talk about power amplifiers you might as well get a pair of Emotiva XPA-1s.
http://emotiva.com/xpa1.shtm
A pair of 1200VA transformers, 1000W/channel into 4 ohms, 240,000uF of capacitance.

http://www.allegrosound.com/Sansui_B2101.html Pretty cool for a vintage amp though.smile.gif To be honest I couldn't run any of those amps in my house for very long without tripping a circuit.

I have a H/K 3490 and a pair of Lsi9's in 10x12 room.redface.gif

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