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In Reply to: RE: "Could the need for more power be related to 'dynamic headroom'?" ... posted by Norman M on July 07, 2015 at 21:23:26
| Work is required for a driver to perform its job. Larger drivers require more work (than do smaller drivers).
But the efficiency of coupling the motion of those drivers into acoustic output, especially at lower frqeuencies, goes up as well.
Follow Ups:
You convinced me, hereafter I'm only going to be listening to my Tympani IVAs powered by an Onkyo TX8511 (which BTW does a fairly decent job with my MMGs).
From crutchfield.com:
"For high-end stereo sound at a remarkably down-to-earth price, check out this impressive receiver from Onkyo! Boasting 100 watts x 2 channels of clean, high-current power, the TX-8511 is a dream come true for music lovers everywhere. Onkyo is famous the world over for their low-impedance amplifier design — and a look inside this model reveals why.
Onkyo pays attention to detail in every aspect of construction. The transformer: oversized and shielded for maximum power capacity and stability, and minimum hum. The filter capacitor: oversized for clean sound during your music's most demanding dynamic peaks. The cast aluminum heat sink: oversized for efficient heat dissipation, and thus longer life from your receiver. Discrete outputs: designed to run cooler, and to keep your music cleaner, under high-volume, low-impedance conditions. Anti-resonant chassis and aluminum front panel: highly rigid to fight distortion-causing resonance."
If you highpassed the input to the amplifier to match the frequency response of the MMG's you'd probably not need more power, all else being equal (which isn't the case---Maggies have also generally increased in efficiency over time).But obviously people want to use the big drivers, to give substantial output at substantially lower frequencies, so the power needed to achieve desired and feasible results is of course higher than using small drivers to give less. But still less power than trying to make small drivers give the same SPL at the same low frequency!
Otherwise we could use tweeters and headphone drivers full range and we don't.
Anyway, I was thinking more of box-speakers, where higher efficiencies for towers with larger woofers than smaller standmounts are normal.
Edits: 07/08/15
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