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I have a Emotiva UPA-2 amplifier. I also have a Yamaha M-45. Is it possible to hook the Yamaha amplifier up to the Emotiva amplifier? The Emotiva is powering a pair of Cornwalls. The emotiva is rated at 125 watts a channel and the yamaha is rated at 125 watts a channel. Would I benefit anything if it is possible to do this? Could I damage anything by doing this? Thanks.

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What levels of SPL aren't you achieving with 250 watts?

Each amp will only be able to put out the amount of watts it can. Only way to do anything like you're describing would be to bridge each each and run the Emotiva to one speaker and the Yamaha to the other. I know the Emotiva can't be bridged so even that wouldn't be possible.

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While it might be possible for a technician to figure out how to bridge the pair, I wouldn't even consider it.

Each amplifier would have to be reliable at 2 ohms stereo to run a 4 ohm (Cornwall) load in bridge, and theYamaha would blow up (sooner than later) . Don't know the Emotiva, but I doubt it will like being slammed at 2 ohms either.

With an electronic crossover you could bi-amp, that would play a lot louder without stressing the amplifiers. You could also use the amplifier with the bass bass on the LF, and the amplifier with the best highs on the HF. A good electronic crossover might run you $100 used.

  • Posted by
djk(M) on December
23, 2001 at 02:21:45

In Reply to: Question:
amp power and bi-amping
posted by Tony B. on December 22, 2001 at

If you use an electronic crossover and bi-amp a
speaker like a Klipsch Cornwall with a 50W amp on the bass and a 10W amp
on the mid and hf it will play as loud as a 400W amp through the
passive crossover.If you 'bi-amp' your Newform speakers with a 250W amp
on the bass and a 160W amp on the hf without an elecronic crossover it
will play as loud as the 160W amp would play running both.The 4:1
benefit for bi-amping is only there when the spectrum is divided ahead
of the power amps and when the division point is near the mid point of
the spectral distribution of energy.On a voltage basis the division
occurs around 250hz.This must be weighted by the peak to average ratio
so that the equal energy point for above and below the crossover is
about 500hz.This is also affected by the slope of the crossover.For the
example of the Klipsch Cornwall it has a 600hz crossover point.If the
drivers were the same efficency then 50W + 50W would = 200W through the
passive crossover.In reality the HF is 10dB more efficent than the LF so
we only need 50W + 5W to = 200W.If the HF remains undistorted it will
mask distortion from the LF amp driven slightly into clipping.This means
that if we use a 10W HF amp with a 50W LF amp it would take 400W to
play the same level undistorted through the passive crossover.If you
'bi-amp' your Newform speakers without an electronic crossover each amp
will be receiving full range signal and will clip at the same point it
did with only one amp hooked up to the speakers.It does sound different
to do this, but make no mistake, you will not be getting the benefits of
dividing the signal ahead of the amplifiers.

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