Amplifier Gain - Clarification Needed

[schneiderdn]

I just purchased a Marantz SR5400 rated at 6 x 90W; I also have a Carver A400X rated at 2 x 200W. I am not sure if I should power all six speakers via the Marantz, or throw the Carver into the mix and use it for the front l/r mains.

I'm assuming from a power standpoint that the Carver would take some of the weight off of the Marantz = potentially cleaner sound from all speakers. However, I am concerned about the differences in amplifier gain (between the Carver and the Marantz) and what affect it will have on my theater setup.

Based on what I've read, I'm guessing that the volume levels of my l/r main--in relation to the other speakers--will vary with changes in master volume levels. Is this a valid concern, or I'm I confused about what gain actually means? Any clarification on this subject matter would be greatly appreciated.

 

[nm2285]

Probably the best thing you could do is use the Carver. Get an SPL meter from Radio Shack and set the levels of each of the speakers that way. What kind of speakers do you have? Maybe it's unnecessary to use the Carver, but I'm sure it couldn't hurt.

 

[schneiderdn]

Yeah, I'm sure my curiosity will lead me to try it both ways. Currently using Paradigm 7se MkII's for the front l/r and Paradigm 300 center; all three have identical drivers, are 6-ohm, and are rated at 120W (recommended), 170W (max). The carver has plenty of reserve while pushing the two mains in stereo and they sing pretty well. Thanks for the advice.

 

[Jack N]

I was concerned about different gain levels as well when I decided to use external amps. Even though I use different model amps, I stuck with the same manufacturer for all them figuring that the gain levels would be reasonably close that way. Apparently my thinking was correct because I've been unable to tell any differences between channels as far as volume is concerned. I'll be watching your thread to see what you come up with.

 

[schneiderdn]

Thanks for the input Jack N. I'd also like some clarification, but I have yet to come across an electrial guru who can tell me if this a valid concern (from what I've read, it appears that it should be).

 

[annunaki]

When setting up a system with separate amplifiers definitely utilize an SPL meter to match volume levels. Basically, what you would be doing is matching the voltage from all channels, (if the impedences are the same) reguardless of the amplifier(s) used, to the same level, thus giving the same output level in db. By using the Carver you will most likely not notice a large difference with movies. Two channel music will yield a drastic dynamic change however (for the better). You would have a lot more power available than the receiver can offer. If your system is calibrated to the standard 75db with a zero bit pink noise track, you will not experience a difference in relative volume as the master (vol) control is moved.

 

[av_phile]

Having identical gain is ideal but using different external power amplifiers is just fine provided they are level-matched in terms of delivering the same SPLs across all channels from where you are seated when listening to a multi-channel program. I would suggest using that SPL meter if you can find one. Otherwise you will just have to trust your ears.