I have to agree with what everyone is trying to tell you. as I stated, bi-wiring and bi-amping are not the same thing and passive bi-amping and active bi-amping are not the same thing nor give same results. of course you can't tell the frequencies apart, there's nothing in the receiver to separate the frequency band into multiple parts for sending individually to your tweeter, wooder & mid-range. The Susano is passive bi-amping.
what you "hear" is perhaps a minor increase in volume by having 2 amps connected, but even at that, you'd have to be listening pretty loud for it to make a difference. or expectation bias...you expect it to sound different because you paid the money for expensive cable or adding amps so it does
I mentioned the math shows that even if you assumed the most optimistic results that biamping increased the power from 140 to 280 max output, it doesn't make that much difference in volume:
dB difference = 10 x LOG(power1 / power2)
Assume 140 watts per channel normal and 280 watts bi-amped:
dB difference = 10 x LOG(280/140) = 3 dB
1. 1 dB is considered the least perceptible difference
2. it takes 6 to 10 dB to be perceived as twice as loud
3. the most optimistic bi-amp result is at MAXIMUM power, which would only be the case on dynamic peaks that last fractions of second to a second maybe. during normal listening at low levels, the difference in volume would be even harder to distinguish.
4. you can accomplish the same thing by turning up your volume knob 3 dB. as long as you aren't already going into clipping or at high volume levels to begin with.
5. Klipsch RF-7 speakers are so efficient at 101 dB/meter @2.83 volts!! that it would take far less power than the Susano amps in normal mode to deliver VERY LOUD levels without any bi-amping at all. My speakers on the other hand, are only 85 dB/ meter efficiency so they do take a lot
more power than your Klipsch's to give same volume level. You don't even need the normal power capability of the Susano to drive yours
6. are you aware that the power supply in the Susano is capable of 1400 watts total? meaning it's individual amp channels are rated at 140 w X 10 channels. but, it is quite capable of exceeding that power rating at 5 & 7 channels driven. Home Theater Magazine bench tested it in 2008:
channels driven continuously into 8-ohm loads, the amp reaches 0.1% distortion at 199.4 watts
and 1% distortion at 267.3 watts.
channels driven continuously into 8-ohm loads, the amp reaches 0.1% distortion at 198.6 watts
. I was unable to measure the power level at 1% distortion because the protection circuit engaged before it reached that level. It reached the manufacturer's stated distortion of 0.05% at 181.1 watts, which is not all that far from the 200 watts specified by Pioneer.
In other words, it's a 200 X 7 power capable ampflier! How much power do you think
you need to drive those 101 dB efficient Klipsch's??
Bottom line, with those Klipsch speakers, you are "wasting" your time passive bi-amping. If you had an all Magnepan speaker setup, it might be justifiable, but really not in your case. you are free to experiment and try different things with your gear, I don't think anyone begrudges you for trying things
but we are giving you the objective side of the argument as a counterbalance to the subjective side - is what you think you hear real or significant.
if you think you are hearing "better" sound, and want to justify passive bi-amping as done in the LX90 or bi-wiring because of some audiophile urges, you are free to do so
you wanted to know about speaker damage. if you bothered to read
your own speaker manufacturer's specs on their website, you'd know the answer
....no, the RF-7's have a power rating of 250 watts rms to 1000 watts peak - clearly says that on the product sheet. so, did you really need to ask?
I am just adding to the objectivity that already been presented to you.
BTW - once upon a time, I had a Sansui quad receiver (still do actually:o) that had a double power switch for 2 ch mode. it went from 4 X 60 wpc to 2 X 120 wpc. Yes, it was slightly louder at the same volume knob setting but by no means was it anywhere close to twice as loud. And I was driving Magnepan speakers off it even back then so taxed the receiver hard so at the loud levels I listened to, one could expect to hear a slight volume increase from doubling the amp power: the VU meters on it would spike sometimes at the 40-60 watt mark. so I do know a bit from practical experience that the math doesn't lie Edited by ss9001 - 12/30/12 at 7:03am