AV Receiver - 4 Ohms - AVS Forum
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post #1 of 16 Old 04-04-2007, 03:15 PM - Thread Starter
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Any suggestions for a mid-level AVR that provides mullt-zone, HDMI, etc., and supports 4 ohms speakers in a 5.1 surround set-up? I was interested in the Denon 2807 and the Yamaha 2700, but both recommend 8 ohms.
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post #2 of 16 Old 04-04-2007, 09:20 PM
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M&K recommends Denon, good for 4 ohm.
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post #3 of 16 Old 04-04-2007, 10:58 PM
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The Denon and the Yamaha are rated by the manufacturers down to 6 Ohms. You're probably safe with them but Rotel is an excellent choice for a 4 Ohm A/V Receiver that you may also want to consider. If a heavier-duty receiver doesn't have all of the features you want, you could add a stereo power amp for the fronts to either the Denon or the Yamaha with excellent results.
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post #4 of 16 Old 04-04-2007, 11:35 PM
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They'll still work at 4 ohms... Hooking up a 4 ohm speaker to an amp meant for 8 ohms doesn't automatically blow stuff up, but depending on the internal amp design, it may limit the amount of power you can get out of the amp.

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post #5 of 16 Old 04-05-2007, 05:16 AM
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A 4-ohm load on a 8-ohm rated receiver will most likely generate more heat, too. And a 4-ohm rated speaker may also dip down below 4 ohms much more often than a 8-ohm speaker - depends on the speaker. The sensitivity rating on the speaker will determine how much oomph it needs. A 4-ohm 92db speaker will be a easier load to the same receiver than a 88db 4-ohm speaker.

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post #6 of 16 Old 04-05-2007, 05:55 AM
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Arcam AVR350 will push 4 ohm speakers all day. HDMI is video pass thru only.
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post #7 of 16 Old 04-08-2007, 06:28 AM - Thread Starter
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Would you add a separate AMP to drive 5 Polk Audio LCi speakers (4 ohms) or would the AV Receiver, such as a Yamaha V-2600 or a Denon 2807 be sufficient? If you would add a separate amp, any recommendations for a budget of $500-$600?
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post #8 of 16 Old 04-08-2007, 08:57 AM
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I have an older Yamaha rxv 630 avr receiver that I use to push 4 ohm front speakers and, I think, a 6 ohm center (all diy speakers). My Yamaha pushes them fine, although I only run them at about half volume or less. A few months back, I purchased the Behringer A500, and, using the preouts on my receiver, use it to power my two mains.

My receiver does have a switch on the back for use with either 4 or 8 ohm front speakers, though. I've never (in the two years, I've used these 4 ohm speakers) had any problems with the avr heating up or any other problems. My A500 works just fine for me (but, I am not an audiophile, by any means). I think there are several amps out there in your budget that would do just fine (especially "pro" type amps, such as the Behringer. Also look at QSC and Crown and maybe others).

Best of luck, Frank

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post #9 of 16 Old 04-08-2007, 11:03 AM
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It takes a lot more current to drive a 4 ohm Thiel 7.2 speaker than it does a 4 ohm Polk LSi9 -- both being similarly efficient. Take a look at any given speaker manufacturers specs for clues to see if a modern high current reciever can effectively drive them. A 4 ohm speaker with a 1" dome tweeter and 5" woofer rated at 10 to 100 watts should be no problem, whereas a 4 ohm speaker with 1", 4", 8", and 15" metal woofers rated at 200 to 600 watts would cause most receivers a problem. It takes a lot of current to control many large woofers. I have had boomboxes in the past that had 4 - 6 ohm speakers but were driven by puny amps, so there are many other factors involved than just the 4 ohm nominal rating.
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post #10 of 16 Old 04-08-2007, 11:21 AM
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4 ohm isn't the whole story, it's a question of how low the impedence dips below 4. Ideally you want to consider the impedence curve throughout the frequency range, as well as the speaker's efficiency ratings.

BTW, I drove a pair of AR-90's (4 ohm nominally) for about 5 years with my Denon 4800.

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post #11 of 16 Old 04-09-2007, 07:50 PM
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Quote:
Originally Posted by svmtl View Post

Would you add a separate AMP to drive 5 Polk Audio LCi speakers (4 ohms) or would the AV Receiver, such as a Yamaha V-2600 or a Denon 2807 be sufficient? If you would add a separate amp, any recommendations for a budget of $500-$600?


I wouldn't add an external amplifier, you should be just fine with either of those choices. Let us know what you end up choosing

Sty - You are correct but don't forget about loudspeaker efficiency. Thiel are notoriously low ohm range loudspeakers and have been known to kill an amp or two in my travels. I love the whole idea of that happening and they sound pretty good to boot. I'd rather have way too much power than not enough, so I planned my 2CH rig to be ready for anything

Mark
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post #12 of 16 Old 04-09-2007, 07:55 PM - Thread Starter
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What i am considering are Polk audio: (LCR) LCi-RTS100 (4 ohms, 92db efficiency) and 2 rear LCi 80 (4 ohms, 90db efficiency). Another option is to install 5 LCi 80s. Do you see any difficulties driving the 5 speakers using a Yamaha 2600/2700 or Denon 2807 or 3806 or must I add a 5 channel amp?
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post #13 of 16 Old 04-09-2007, 07:57 PM
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I prefer the LCi80 option but that's entirely up to you and your application. No, I don't foresee any problems with that choice of amplification.

Mark
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post #14 of 16 Old 04-16-2007, 05:11 PM - Thread Starter
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Why do you prefer the LC80 option over the RTS? Explain.
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post #15 of 16 Old 04-16-2007, 05:13 PM - Thread Starter
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Why do you prefer the LCi80 option over the RTS? Explain.
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post #16 of 16 Old 04-16-2007, 08:40 PM
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Denon and HK AVR's have no problems with efficient/stable 4ohm speakers

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