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I've been trying to determine if this Yamaha receiver can power and is certified for 4 ohm speakers.

Specifically these are the speakers I'm going to be using:

http://www.triadspeakers.com/products/iws4mm.html


(5 of them for 5.1, and possible two additional speakers undetermined at this time for rear 7.2. I will also have two subs that have their own external amplification).


The speaker specs are:


Power Handling :

Maximum power rating 100 watts


Impedance:

Nominal impedance 4 ohms

3.6 ohms minimum


Sensitivity:

87 dB/1W/1m


2pi Frequency Response:

80 Hz - 20 kHz (+/-3dB)



SURE APPRECIATE ANYONE'S HELP WHO IS KNOWLEDGEABLE ABOUT THIS RECEIVER. THANK YOU -
 

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According to the specs on Yamaha's website it can go down to 2 ohms. You may want to research that a little further, I don't know how that affects the other channels.
 

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Discussion Starter #4

Quote:
Originally Posted by Mflo Soldier  /t/1526227/yamaha-rxv-775wa-449-at-newegg#post_24636682


I've been trying to determine if this Yamaha receiver can power and is certified for 4 ohm speakers.
It is spec'd for 4 ohms, though they only list RMS power for 8 ohms:

 
Dynamic Power per Channel (8/6/4/2 ohms)140/180/210/250 W
 

See the specs at http://usa.yamaha.com/products/audio-visual/av-receivers-amps/rx/rx-v775_black_u/

 

also found this in the owner's manual, which you can download from there:

 

Caution

• Under its default settings, the unit is configured for 8-ohm speakers. When connecting 6-ohm speakers, set the unit’s speaker impedance to “6 Ω MIN”. In this case, you can also use 4-ohm speakers as the front speakers. For details, see “Setting the speaker impedance” (p.18). 

 

Looks like you are GTG.
 

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Does anyone have this receiver and know, or does anyone have a link online to anywhere that has verified that this receiver is OK to use with 4 ohm speakers all around?


I read the manual specifically tonight and could only find that if you switch to the 6 ohm min setting on the receiver that it says you can also use 4 ohm speakers FOR THE FRONT. This leads me to believe that they'd say that for a reason, and I guess this may mean that only the two front speakers?


In any case, all 5 of my speakers in my 7.1 setup are 4 ohm. (Zone 1)


I also have three 8 ohm type ceiling speakers. (Zone 2)


REALLY appreciate anyone out there that might know if this receiver would or wouldn't work. If nobody knows it would be great to know that too, I would just likely not proceed forward with it because I want to make sure I have a receiver that works properly with my speakers and overall setup.


Thanks, again, in advance if anyone can comment -
 

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Call Yamaha and ask them. As of a couple years ago, they had a support line that could answer these types of questions. I got great service from them, even when I called late at night. They were down in Texas, from what the fellow told me.
 

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I did that yesterday in fact. Their "level 1" support I talked to said this receiver model only supported 4ohm speakers on front two L and R. What was more interesting was, when I asked him to recommend any Yamaha receiver that would support my 4 ohm speakers all around in my 7.1 setup, he said Yamaha didn't have ANY receiver that would support. I find this hard to believe. I have an open pending case with their "level 2" support to see if they can confirm this information further but haven't heard back yet.

Hmmm...
 

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If you only need 5 channels, pick up an Emotiva UPA-500 for $399 to use with it - the Yamaha 775 has a full set of pre-outs. For 850 bucks, you'll have a killer combo that will provide a solid 100 WPC at 4 ohms with all 5 channels driven, and you can still use Yamaha's YPAO to fine tune the sound across all the speakers. If you have big power needs, get the XPA-5, for 300 watts per channel.
 

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Hey talked to Yamaha next level support, who called me back. He confirmed that other than the L and R two channels that can be 4 ohm speakers, none of the other speakers can be 4 ohm. He also confirmed that there are ZERO Yamaha receivers that support all 4 ohm speakers ... I'm a little surprised on that. FYI for everyone.
 

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Quote:
Originally Posted by Mflo Soldier  /t/1526227/yamaha-rxv-775wa-449-at-newegg/0_100#post_24724232


Hey talked to Yamaha next level support, who called me back. He confirmed that other than the L and R two channels that can be 4 ohm speakers, none of the other speakers can be 4 ohm. He also confirmed that there are ZERO Yamaha receivers that support all 4 ohm speakers ... I'm a little surprised on that. FYI for everyone.

There are very few surround receivers rated for use with 4 ohm speakers for all channels. If you doubt this, take a look at other brands, and look at the manuals, as well as the warnings on the rear panels near the speaker terminals.


For example, here is a picture of the rear panel of a Denon AVR-X4000:

http://usa.denon.com/Assets/images/products/AVR-X4000/EL_avrX4000_e3_bk_re.jpg


If you look closely, they recommend a minimum of 6 ohm speakers on the back panel. And this is not a low end Denon. The same is true of most other brands.


Very often, one can get away with hooking them up anyway, but if you want to be safe, it is usually best to buy a separate power amplifier rated for low impedances if one has low impedance speakers.
 

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Quote:
Originally Posted by Jack D Ripper  /t/1526227/yamaha-rxv-775wa-449-at-newegg#post_24729552


There are very few surround receivers rated for use with 4 ohm speakers for all channels. If you doubt this, take a look at other brands, and look at the manuals, as well as the warnings on the rear panels near the speaker terminals.


For example, here is a picture of the rear panel of a Denon AVR-X4000:

http://usa.denon.com/Assets/images/products/AVR-X4000/EL_avrX4000_e3_bk_re.jpg


If you look closely, they recommend a minimum of 6 ohm speakers on the back panel. And this is not a low end Denon. The same is true of most other brands.


Very often, one can get away with hooking them up anyway, but if you want to be safe, it is usually best to buy a separate power amplifier rated for low impedances if one has low impedance speakers.

Not that I doubt it, I just thought that out of everything Yamaha has there would be something out there that could support these speaker requirements. That Denon you reference IS lower end to me b/c higher quality (higher cost too) manufacturers do have products that support 4 ohm all around.


Just wanted to post what I found out on this Yamaha model and ALL Yamaha products if it is helpful info for anyone. That is, you can scratch out any Yamaha receiver if you're looking for something certified to drive all your 4 ohm speakers w/out worry of having issues. And this info is directly from Yamaha's tech team who called me back when I inquired on this RX-775 model.
 
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