using NAD 763 for 4.1 - how much power do I get?

[Bevan]

i'm wanting to go from 2 to 4.1 channels. not interested in a centre channel as music my only priority.

looking at the nad 763 but the 753 is also an option.

what i'm wondering is will the 4 speakers get the extra power from the 2 channels that are not being used? or are ther power supplies independent of each other? if you know what i mean.

i know the 763 had 10 watts more per channel than the 753, but would spending the extra cash for the 763 give me even more power, or will the extra channels power 'go to waste'?

power is my main consideration as i will be powering dynaudio standmounts. are there any other differences between the two models other than power and number of channels? specifically, are the pre-amp sections of equall quality??????????

thanks for any help in this matter,

bevan

 

[Resident Loser]

Yes and no...

what i'm wondering is will the 4 speakers get the extra power from the 2 channels that are not being used? or are ther power supplies independent of each other? if you know what i mean.

...but not really...how's that for a half-fast answer...

No. All channel outputs are independent(unless bridge-able, but that's a whole 'nother story)...but, then again, yes...however...it's debatable that all A/V amps actually are capable of putting out spec levels with all-channels driven...generally speaking...so, with only two channels(or less than the max #) cooking at one time, the internal power supply should be able to supply the amplifiers max output requirements or at least closer to it.

BTW, 10 watts difference isn't really a difference, as power is logarithmic in nature, meaning it requires 10X the power to sound twice as loud...or something like that.

jimHJJ(...I'll get it right eventually...)

 

[Bevan]

thanks Jim.

I guess theres no way to do the math and get an exact answer? some companies do publish a figure with only 2 channels driven and it is somewhat higher than for all channels driven simultaniously. youre saying then that the same applies, but to a lesser degree, when 4 of the 6 channels are being driven. but i thought i may have read that the front 2 or 3 channels are somehow coupled, seperate from the power supply of the rear channels??? (my knowledge of the internal working of an amp is pretty limited)

maybe i should contact NAD for an exacct figure.

i wonder why the 773 costs 33% more when power/performance gains are as negligable as you say(if the only difference is power and an extra channel)

all pretty confusing thanks again

bevan