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Peak Listening Levels? my plans!!! ?????

Posted by Timbo in Oz (A) on February 28, 2007 at 12:54:37

In Reply to: Peak Listening Levels - Some analysis and some thoughts... posted by DevillEars on February 28, 2007 at 09:22:27:

ARGHHHHHH the turn that NOISE down syndrome!!!

spkrs 91db/w, biamp array 26 watts ~ 14db/w,

Listening distance <2 metres! say minus 5dbw?

maximum peaks? 105 minus 5 = 100db!

but these are valve amps with at least 3db headroom, two of.

so peaks over 100 are do-able sans audible clipping.

Soon I will be adding 40wp.c. to drive 'in-parallel passive' bass Eq*', using a 2nd pair of sphere 3's. Adjustable level and boost. Driven from about 180hz on and down into the 20's.

* Baffle diffraction step compensation, (single model3's Audio spheres just did NOT do BDSC'n,) as there was/IS no Lowpass xover. AND some ELF extension down into the mid 20's. Viz; a longer port and '2nd order with gain' active boost (6th order) OR sealed, and 2nd order active boost (4th). Either way the 2nd order filter should kill any infrasonic cone wobbles either from vinyl or CD, and lower the amount of power wasted on such signals while easing the load the amp sees!

This should give us another step up in achievable peaks, possibly 6db in total but actually, I'm hoping that - it lets us both listen - @ somewhat less loud levels together. As the sound will have more oomph down where orchestras growl, and rock band's pound it out, from the upper bass and on down.

And, the LP filter @ ~ 180 hz into the bass-only sphere won't be in the full-range feed to the biamped 3's. Also the bass sphere ought to add seemlessly to the main pair, BEING THE SAME DRIVER AND ENCL, and having a sphere a foot or so below - shouldn't drastically effect the mains pair's diffraction behaviour, imaging and transparency. I'll probably re-use the big cushions as well!

there is also driving the room in the bass from two different points, the slot-load on the longer port for control, AND I'll be putting a trumpet mouth on its exit avec nipples, both ala B&W's ELF ports.

Look Ma, no sub!!!!!!

Then I can build those 12's into our bed base!

Warmest

Timbo in Oz
The Skyptical Mensurer and Audio Scrounger

And gladly would he learn and gladly teach - Chaucer. ;-)!

'Still not saluting.'

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