Am I missing something here?

As I recall, the rate of volume attenuation for dynamic drivers is 6db/meter and 3db/meter with panels. You're sitting approx. 4 meters from the speakers. Do the math and I think we can explain most of your loss. Also. I am not very familiar with Mac gear but is there by chance a selector switch on the back panel for 4/8/16 ohms to be set according to the demands of your speakers? If so, check to make sure it is adjusted accordingly.

your mac will probably never use more than a fraction of its rated power to drive your speakers

If your original amp is good enough, which apparently it is, then you'd see extra power only during short peaks when it is called for. Most of the time your speakers are using only a few watts.

There is no impedance switch, there are separate speaker connectors for each load. They are correct. One thing I was also curious about is when I hooked up a Behringer DEQ2496 I ran unbalanced from the preamp into the DEQ XLR input, then XLR from the DEQ to XLR input on the McIntosh. The Behringer only accepts XLR. I did select the balanced switch on the amp, not sure if that matters. I think I've read here a few times allot of you guys prefer to run unbalanced, but I already had the XLR to XLR cables and figured I would get a better signal than running a bunch of adaptors. Also I do have the Zero gain/attenuation set on the DEQ as to not lose signal. This baffles me, someone must have their Revel's POUNDING.....WITHOUT 1500Watts of power. Thanks Guys

hmmm,why do you say that your energy's are crappy,ive heard a few pair of energy speakers & i thought that they sounded damm good & offered great value in this insanely priced hobby of ours.

if your looking for high spl's while running the mc352 the revels are an extreme mismatch ,any 4 ohm speaker that is 88 db is going to require a boat load of power,convert the ohmage of the revels into an 8 ohm load & you get an 85 db efficient speaker, bad news for spl's.

everybody has their own idea of what loud is & some will say that the mc 352 will drive the revels easily, it wont, from your post i gather that your looking for spl levels of around 120 or better, you have done the math & you know the revels wont give it up with the mc352.

your also comparing apples to oranges in speakers, the energy's are designed to rock & the revels are a hifi job designed to image.

the solution is simple, either look into a more efficient speaker or sell the mc352 & get an amp that doubles down in 4 ohms & push some serious wattage to the revels, either way the mc352 is not a good amp for the revels if high spl's are desired.

Good point Bigjoe, my apologees to all energy lovers. They actually DO sound pretty darn good for a lesser expensive speaker at moderate volumes. In fact I was looking at their higher end models as well. I guess I am getting frustrated, I thought it would be easy to slap together an awesome system by throwing money at it. I was wrong. At least I didn't purchase the speakers yet.(Thank God)

You say the speakers are about to explode at 92 dB. I'm not uqite sure what you mean by this, but I'm guessing they sound strained. I wonder if this si due to the limits of the speakers, not hte amplifiers. I am not familiar with the speakers, but just because a speaker is supposed to be able to handle a certain amount of power doesn't mean iot will sound good while doing so. Also, I question Acresverde's 6dB/meter calculation. Sound usually attenuates exsponentially, not arithmetically. Moving from 1 meter to 2 meters away should give a bigger change in volume than moving from 5 meters to 6 meters away.
In any event, 350WPC is a lot in the high end world, and 88dB efficiency is not bad either. I would say you if possible, try the coombination together if you can, you may be surprised. If you are buying new Revels from a store, they should be able to accomodate this