Main chanel A/B power

[Kilwox]

<font color='#000000'>This might be a silly question, but on my RX-V2400 it is rated at 120 W/chanel. &nbsp;If I hook up speakers to both the A and B main jacks, does each pair get 120W or is is split between them? &nbsp;In other words does each pair only get 60W then?
I only really use the B pair of speakers at parties when the volume is a little higher, and maybe that's the wrong time to be splitting power?
Any info will be helpful.</font>

 

[zumbo]

<font color='#000000'>Power is split when using A/B at the same time. Each speaker would roughly get 60w. Not a good thing for jamming. Also, speakers would need to be no lower than 8ohms each when this is being implemented. I would suggest to use 7ch stereo at a lower volume for parties. This is what Yamaha recomends.

Not a silly question at all.

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[RX-V2400]

<font color='#000000'>Not a silly question at but I don not agree with Zumbo's answer. Both A and B speaker poles give the same voltage and will, all other things being equal give the same power. The problem is the drain on the power supply that will reduce the available power not only to the front A and B but all chanells. Having an 8 ohm speaker on each of A and B is the same as having a 16 ohm speaker on A only. So as Zumbo rightly says if you had 4 ohm speakers on both A and B that would give aboutt he same power as one 8 ohm speaker on A.

But to give a more meaningful amswer I need ask why would you want speakers on A and B when you have five other chanells already? If you want more volume from your whole system then you must add a front end power amp.</font>

 

[Kilwox]

<font color='#000000'>The speakers attached to the B jacks are in the kitchen, about 50 feet away from my livingroom. &nbsp;If I'm understanding you correctly RX-V2400, if all the speakers are 8 ohm, then the amp is seeing a 16 ohm load. &nbsp;Does this mean that all the speakers are still gettign 120W, but the current draw on the power supply is doubled??</font>

 

[RX-V2400]

<font color='#000000'>I think so, but listen to what Zumbo will say. Why are you not using the zones features. Read the zones part of the manual. What is your problem? are you lacking power?</font>

 

[annunaki]

<font color='#000000'>When using A/B channels on a receiver, I was under the understanding that the power available, is halved. (e.g. 120x2 watts into A, add channel B and each speaker would receive 60 watts per channel) When both channel A and B are selected I believe it may turn on a regulator for power rather than simply paralleling the outputs. In some models it actually might parallel the outputs, but the amplifier is not capable of doubling its power into a lower impedence and/or is regulated into the lower impedence.</font>

 

[Guest]

<font color='#000000'>&quot;When both channel A and B are selected I believe it may turn on a regulator for power rather than simply paralleling the outputs. In some models it actually might parallel the outputs, but the amplifier is not capable of doubling its power into a lower impedence and/or is regulated into the lower impedence.&quot;

This above statement is correct. &nbsp;

RXV2400,
The power does not get equally distributed if both A and B terminals are being used. &nbsp;It uses the same voltage and current, but bumps up the impedance effectively resulting in half the headroom being available to both A and B outputs. &nbsp;Basically, if you have two sets of 8 ohm speakers being powered and you flip on both sets at the same time, you will be bumped up to 16 ohms while driving both sets, resulting in half the volume and/or output. &nbsp;

This is a built in protection scheme of the unit in order to not damage itself. &nbsp;The headroom of this shared line is fixed and can not be doubled or split up. &nbsp;It simply doubles the impedance to lessen the output of both sets if used at the same time. &nbsp;If one were to &quot;crank&quot; the volume up in order to compensate for this fact, serious damage to the unit could occur. &nbsp;So if you are using both A and B at the same time, only use them at moderate listening levels. &nbsp;

All other channels will operate independently from these &quot;shared&quot; channels. &nbsp;Also, each (L&amp;R) channel has the maximum potential of 120 watts. &nbsp;And that does not mean each channel driven simultaneously. &nbsp;Most all receivers at this price point or below, are only rated at 1 channel driven to its max. &nbsp;So while the 2400 could possible do 120 watts on one speaker at a time, this does not mean that 2 or more channels will ever be pushing out 120 watts at the same time. &nbsp;

This also does not mean that each channel gets an even 60 watts. &nbsp;A person will most likely be using different types of speakers on each set of output terminals. &nbsp;Thus, different speakers will demand varying amounts of power on the &quot;shared&quot; channels. &nbsp;One set of speakers may be more efficient and only require 20 watts, while the other needs at least 50 to run. &nbsp;

best,

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