Originally Posted by Bengali
I recently purchased the Pioneer Elite SC-05. Using the 1.6's for the fronts
and MMG's for the rears. I set the speakers to LARGE instead of small.
Everything is fine for awhile. I watched a movie, can't remember which
one, it had some tremendous bass and I heard the 1.6's clip, not a good
sound. Everything still sound fine. My question is it clipping due to
the crappy ICE amps cannot handle the 4 ohm load or is it because
the maggies cannot take the abuse of lower frequencies?
First let me say.. I must tell you, I'm not trained in any of this, I just go at it from what I learn on forums like this and trial and error (admittedly BIG error!)
I had a similar, but more injurious incident with my 3.6's.
I suggest you look at what your dB settings in your surround settings is. Then manually adjust your dB to the fronts down by at least 3 dB and balance the rears by turning down the db level to them by the same amount. The only down side is the overall volume setting on your receiver will be higher for a corresponding "listening" volume.
I was bi-amping with an ICE powered amp for lows and a tube for mid-highs.
I had watched a couple movies using the surround settings from the tube amp only configuration, and everything seemed OK. But I had also placed the center channel back into the mix since bi-amping, so I thought I'd use the Audyssy mic and reconfigure the surround settings.
My mistake ( I Think ) was not looking at the settings after the configuration.
Now I don't know what the settings were before I reconfigured, but I did go in and look after the damaging movie.
I watched Babylon AD. Big explosions, lots of very heavy bass too. I noticed the walls rattling, (very loud!) but didn't notice speaker issues. (It was a movie!)
I put on some music afterwards and heard a nasty buzz/rattle in the left speaker in deep male voices that hadn't been there before. Something is wrong with speaker. I called Magnepan, and they will be on their way back shortly. We'll see.
NOW I don't know all the technical mumbo-jumbo and proper terms are , but Here is what I think happened....
When I reconfigured with the Audyssy, the settings it used were +10.5 dB for the front (3.6R's) and -4 dB for the rear (Klipsch RS42s) A HUGE difference for balance, BUT the +10 gain push from the receiver was pushed to the crossover which added another +4 dB (to match the gain of the tube amps) then to the ICE amp and that puppy puts out 1000 w/chnl. So the total gain (If they add together, like I said I'm no techie.. is 14.5 dB
( I looked at the numerical Values after the fact, oops!)
Now since that, I manually backed off the settings to +4 dB to the fronts (now my 1.6's) and the rears (still Klipschs)are now -10.5 dB. Same numerical difference, good sound balance. I'm using just the ICE amp now powering the 1.6's, and boy they do kick out some good bass too! No harm or clipping happening now, however, I didn't play Babylon AD!
So once the 3.6's come back, I'll have to back off the output of the tubes instead of increasing the output of the ICE to balance out before we try the bi-Amp movies again!