I'm confused

Pick up a higher powered ( 150 - 200 wpc ) 3 channel amp and use that for your center, left and right channels. This will take the load off of the power supply in the Denon and allow it to deliver more power to the remaining four channels in both a more consistent and dynamic manner.

Since you had all 7 channels pulling on the power supply at the same time, i'm sure that the power supply was sagging. This causes the power available to any channel at any given time to be reduced, resulting in starvation, clipping and smeared sonics. By reducing the number of channels drawing upon said power supply, in effect, you help to stabilize the power supply and minimize sag. This allows the amp to run at rated power with greated dynamic headroom for the remaining four channels.

At the same time that all of this is taking place, the majority of signal that you are listening to would be fed to the three front speakers in both a higher quality and more potent manner via the three channel amp. You get the most bang for the buck this way and can always upgrade the remaining channels at a later date should you feel the need. Sean
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Marty, it seems that you haven't actually stated your goal; is it to listen to bombastic movies without clipping? And/or do you want to be able to clearly hear each instrument in a 2 channel symphony? While it's true that the same amount of money will get a better 2 channel system, how much would you miss by not having good surround sound (for music as well as movies)? I believe your most cost effective solution here is indeed a more powerful multi-channel amp, because the Denon, while not super-high-end, has excellent features (I'm assuming it DOES have multichannel pre-outs) as a pre-amp. As I think Marty is alluding to, you might even be able to solve your clipping problem with a decent powered sub-woofer to replace some of the amp-sapping low frequency duties. I must say however, that in most AVRs, the sound quality will suffer slightly in some ways when using bass management on the receiver, but the tradeoff may be acceptable to your ears. You also really should divulge what your speakers are and what their efficiency is if you know it.

Good luck,

Mike R.

All of the advice above is good, so please excuse me if I question one aspect of your thinking (and I don't mean this as a personal insult in any way). You didn't mention any near-term plan to get a larger listening room, so I don't see the merit of a 7.1 HT system in a room that measures 12'x13'. Infact, I think the 7.1 HT setup is questionable for the vast majority of home listeners for two reasons:
1. there is very little software being made for either 6.1 or 7.1 format, and from the articles that I've read there is little intent in Hollywood to do so;
2. adding several more sets of speakers, plus the required amplification, adds a lot of cost and provides little or no improvement over a high quality 5.1 system (unless, perhaps, the listening room is quite large).

With regard to point #1, I suggest you go the following two links on Bryston's Web site and read the comments about 5.1 vs. the expanded formats:
1. http://www.bryston.ca/newsletters/55_files/vol5is5.html
(see the article called "Encode vs. Decode")
2. http://www.bryston.ca/newsletters/64_files/vol6is4.html
(see the article called "The Great Capitulation")

My personal advice is to stick with the 5.1 HT setup and invest more money in the quality of your amps and speakers, probably adding a good subwoofer, before adopting the expanded formats. Sean's recommendation to get a decent 3-channel amp (such as the Adcom GFA-5503) for your center and surround speakers makes a lot of sense (and is the approach I used in assembling my own HT system). Investing in better quality 5.1 format equipment will result in a much better HT system than adding several more mediocre speakers and channels of amplification.

Lej1447,

Five years ago I set up an HT system using a Marantz 5.1 pre/pro and an ATI AT1505 5x150 watt amp feeding five NHT monitors. I also have an NHT 12" sub and all this is in a 12x14 room. By now all this equipment is yesterday's tech, but I haven't had the urge to upgrade since. It may be because my interest has been focused on 2 channel listening ever since.

But I wll tell you that I never feel a need for more power or dynamics even on demanding movie scenes. It may have to do with what some of the respondents here have recommended about using a high current amp other than the Denon for your front channels. With the monitors set to small and the subwoofer set to cover everything below what the monitors are fed, I get the full effect of crashes, explosions and dinosaur stomps in a convincing and controlled manner.

In my small room, I feel adding more channels isn't necessary.

Lej1447, just some food for thought..... maybe it's not the amp running out of steam, but possibly the wall? I use a Denon 3803 for my HT. It is rated at 105wpc. I am using said amp in conjunction with 89db efficient speakers in a room just slightly larger than your room configuration. Since that room only has 15 amp receptacles, I find that the amp is fully capable of drawing more power than the wall receptacle can provide.

Maybe a regenerative power conditioner may be in order? If you are trying to avoid more amplifiers (space limitations, heat, interconnects, etc.), could this possibly provide you with an alternative? Needless to say, all of your HT components will benefit from a stabilized power source. Power "draw down" or "sags" will become virtually nonexistent. You will find that your amp will sound like it's on steroids, not to mention the clocks in your DVD player and receiver will become much more stable.

You will probably not notice a major difference in SPL by going from 100 to 200 wpc. But, stabilize the AC power and you will notice that extremely dynamic passages will become much more effortless for the amp to reproduce. You would be surprised. That little Denon is probably capable of drawing as much as 1000-1200 watts from the wall at high volume level passages. Unless you stabilize those types of power draws, the amp will have a tendency to sound it's clipping when it is actually not. This also wreaks havoc on your digital section since the DA/AD clocks need a stable voltage supply.

Something like an Exactpower EP-15 or Accuphase will provide you with a very stable 120v/60 cycle power waveform, no matter what type of load you put it up against. Again, ALL of your HT components will benefit from this type of power conditioning, the unit will not occupy a lot of space, will generate virtually no heat, and would probably be extremely cost effective, condsidering your other options.

Also, if you decide to upgrade to other components at a later date, they will all benefit from stable, clean power.

Just a thought.