Tri-amping Qs:

Gentlemen,
Thanks for your responses. I appreciate them very much and I appreciate you taking the time to write those long answers. I can now go looking for an amp that will have enough headroom @ approximately 75-100w.

Al: Thanks for your two responses. That was thoughtful. Your answers gave me a way to think differently about my questions and gave me a basis to compare amplifiers.

mzkmxcv: Thanks for taking the time to respond. Your answer added more to my knowledge and provided an answer to what power I would need to deal with headroom and also extended my understanding of how to determine how powerful an amp should be to drive particular speakers. Now I know, in the future, that I double the wattage as a good rule of thumb.

When I said "peak," I should have said, "On my chintzy iPhone-based dB meter, A-weighted, the needle infrequently taps105dB," usually in orchestral music. The EP 2.3s have an onboard DSP, so I can use your information about that. I also appreciate your opinion about tri-amping. That will save me a pile of cash and allow me to put more money into a higher quality single amp. I guess it's the geek in me that thought tri-amping would be better than using a single amp.

Again, thanks to you both,
GP

You’re welcome, Gary. Glad I was helpful.

Upon re-reading my previous post, to be precise I should make a slight tweak as follows (the words shown in caps have been added):

From: "At various points in the room, if the two speakers are reproducing identical signals and again putting aside the effects of room reflections, the addition of a second speaker will cause SPL to increase by amounts ranging from minus infinity (i.e., no sound) to 6 db, depending on whether the phase relation of the two outputs at a particular vantage point causes them to sum constructively, destructively, or somewhere in between.

To: "At various points in the room, if the two speakers are reproducing identical signals and again putting aside the effects of room reflections, the addition of a second speaker will cause SPL to increase by amounts ranging from minus infinity (i.e., no sound AT SOME FREQUENCIES) to 6 db AT SOME FREQUENCIES, depending on whether the phase relation of the two outputs at a particular vantage point causes them to sum constructively, destructively, or somewhere in between.

Regards,
-- Al

iPhone-based dB meter, A-weighted 

Being A-weighted would cause a discrepancy, C-weight should be used. On my iPhone I use the SLA Lite app, I have a calibrated mic but I haven’t compared the two to see how off the iPhone is.

mzkmxcv,
Thanks for clearing that up for me. 
GP