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In Reply to: RE: Bi-amping posted by Satie on August 30, 2014 at 09:53:57
"... The 3.x models don't have a 1:1 ratio of top and bass, it is more like 2:3. But many of us like to elevate bass slightly above the mids so being set for 1:2 (top to bass) is useful. ..."
Hi Satie,
This is from the 3.6 manual, Section 11.3:
"Since the effective crossover point for the MG3.6/R is approximately 250Hz, the power requirements for the bass midrange/treble amps are nearly the same. Therefore, use amplifiers of similar power rating. ..."
Is Magnepan and the manual wrong ???
The 20.x panels are crossed over lower, but they also go lower than the 3.X's.
I usually use @ 700 WPC (or more) top and bottom when I biamping my 3.x or 20.x.
Follow Ups:
The nominal 50/50 power distribution point is at 350Hz. If you put your crossover at that point, and you had symmetrical HP/LP electrical crossover slopes, you would need equal power amplifiers for top and bottom.
Cheers,
Dave.
Hi Davey,
Is 350Hz for the 3.X, 20.X or [20Hz to 20kHz] range ?
TIA
P.S.
Are you still running dual dipole subs ?
350Hz is approximate for the 20-20khz range. Some would argue it's lower than that. It might be, depending upon the type of music listened to.
Of course, you don't actually achieve the benefits of bi-amping unless the bandwidth is limited upstream of the power amps via a line-level crossover. This could allow the usage of lower-powered amplifiers and still yield the same effective power, or the same powered amplifiers but yield much increased effective power.
I've been using the dual-dipole woofer setup in my primary system for over fifteen years now. :)
Dave.
"... 350Hz is approximate for the 20-20khz range. Some would argue it's lower than that. It might be ..."I would assume if the speaker can not reproduce the lower octave(s), then the half-way point would change accordingly (i.e. move up).
"... I've been using the dual-dipole woofer setup in my primary system for over fifteen years now. :) ..."
I saw your old post and looked up the Adire DPL-12 (fs 16.3) drivers. Looks like they would make good subwoofers. Sorry to read the Adire driver company is no longer in business.
http://www.adireaudio.com/Files/OldAdireDrivers.pdf
Edits: 09/02/14
Even though the speakers might not be able to reproduce it, the amplifier is still trying to drive it, so that wouldn't shift a "half-way" point unless there was a low-frequency high-pass filter employed ahead of the bass amplifier.
The Adire DPL-12 drivers were ideally suited (Q-wise) to dipole usage with only 6db/octave dipole correction required. However, there are still plenty of drivers that will work effectively. It's mainly about quiet operation and large excursion capability. The necessary equalization can be handled by a variety of electronic solutions.
Dave.
I would say they are wrong if you listen to large scale classical and rock, which have a heavier bass proportion. Furthermore, bass requires serious damping which the upper range is not likely to need.
That said, 700 WPC top and bottom is likely sufficient for the bass unless you have a large room and overkill for the top.
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