Mains cancelling surrounds?

[mtrycrafts]

Another possibility is the OP's system may be underpowered, I didn't see any mention of what was being used to drive those speakers. Maybe the fronts are using up all the power. Something to consider.
Jack

I just don't know of a soundtrack, unless it is a test tone with full power to all the speakers at the same instant, in phase, etc, that would cause that condition.
He has other issues.

 

[TLS Guy]

I just don't know of a soundtrack, unless it is a test tone with full power to all the speakers at the same instant, in phase, etc, that would cause that condition.
He has other issues.

As I have stated before, I'm not convinced that the OP has a problem.

 

[Jack Hammer]

I just don't know of a soundtrack, unless it is a test tone with full power to all the speakers at the same instant, in phase, etc, that would cause that condition.
He has other issues.

It's entirely possible i"m confused. That said, I recall a few years back when I did some experimenting with an amplifier powering my fronts that my surrounds seemed to come more 'alive.' The explanation I recall being given to me was that more 'power' was freed up for the surrounds (I was using a Denon avr2805 w/claimed 110wpc to power my 4ohm speakers). (yes I re-level matched. And no this wasn't a percieved change, I was able to hear specific sounds from the surround channels that went away after I disconnected the 3 ch amp from the fronts).

Jack

 

[ned]

Another possibility is the OP's system may be underpowered, I didn't see any mention of what was being used to drive those speakers. Maybe the fronts are using up all the power. Something to consider.

It's also my understanding that speakers that have the +/- wires correct can still be out of phase due to room/setup variations. A test disc, or the audio setup portion on most THX dvd's, will offer a phasing test to help determine that.

Jack

That's a good thought except that I'm using a different amp to power my mains. I've run thru AVIA test disc and the setup is correct. I'm actually listening to a dolby tru hd blu ray demo which is suppose to highlight all channels simulation.

 

[ned]

As I have stated before, I'm not convinced that the OP has a problem.

I'm waiting for my emotiva mps-5 delivery and will report back if it is my underpowered receiver.

 

[TLS Guy]

That's a good thought except that I'm using a different amp to power my mains. I've run thru AVIA test disc and the setup is correct. I'm actually listening to a dolby tru hd blu ray demo which is suppose to highlight all channels simulation.

Now that really adds to the witches brew! You need to know the phase response of your amps. Some are phase inverting with the output 180 degrees out of phase with the input. Other amps have input in phase with output. You can have amps from the same manufacturer with some of their designs phase inverting and some not. If it is not in the specs, then you need an oscilloscope to tell. Amps I find are split about 50/50.