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I like the use of separate PSU's for Bass and for mid/treble

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Timbo in Oz

In Reply to: RE: BiAmp Noodle posted by pictureguy on May 26, 2017 at 17:19:20

This is one of the advantages of bi-amping horisontally. IE one stereo power amp doing bass in L & Right channels. And, one PSU and stereo power amp doing just mid-treble.
The bass PSU may from time to time be a bit stressed when playing loud or complex music. and you won't hear that in the mid/treble as you might with just one power amp.
The half power point is around 350Hz but 600Hz is near enough if using matching amps, the amp doing <600Hz might be working 1-2 db harder on average. But on loud orchestral tuttis it may be working 3db harder, twice the power.
What does the passive crossover in your panels do? Are both the HighP and LPass set to -3db at the same frequency? (It would be a good thing to find out.) If it's not symmetrical the Mini-Dsp box/es may well do a better job of blending them than you can.

You will need a good mike and stand sitting between where your ears will be.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

Edits: 05/26/17 05/26/17

Follow Ups:

RE: I like the use of separate PSU's for Bass and for mid/treble - bare 08:47:14 05/27/17 (1)
That PS areguement "may' have plausibilty with Linear supplies. But it seems (guessing tho) that you are using SMPS gizmos on the Hypex things. Decent smps feeds directly from the mains... Bass won't sag it.
- RE: I like the use of separate PSU's for Bass and for mid/treble - pictureguy 13:14:41 05/27/17 (0)
  How did YOU know? It IS a Gizmo600 SMPS!
  
  And yes, I suspect that given a bandpass of maybe 50hz to 600hz, that the amp will not be able to tap-out a 600watt PS.
  Too much is never enough
RE: I like the use of separate PSU's for Bass and for mid/treble - pictureguy 21:53:01 05/26/17 (0)
Panel crossover is at 600hz.
I do NOT know the 'knee' frequencies,
But that being said, the Low Pass is 12db (2nd order) while the High Pass is 6db (1st order)
They CROSS at 600hz to sum flat THRU the crossover region. The 1st / 2nd order thing means they are also 90 degrees apart.

Using my Preamp, I CUT the lowest bass to the panels at 45 or 50hz which buys me a few percent and puts the crossover frequency closer to 50:50 than running full-range. The crossover in the preamp is 12db / octave.

I think that can be duplicated in MiniDSP with a little experimentation.

In my 'noodle' each amp module has its OWN 600 watt PS. Another version would include a 1200 watt PS module with outputs for a pair of the nCore.

Limiting bandwidth TO the power amp(s) buys as much as 3db AnyWay, so I would't be overly concerned with a few watts here or there. I'll buff-up the heat sinking on the nCore amps using some kind of maybe 100mmX100mm finned heat sink. I need a PRINT of the mount of the amp so I can take it to a machine shop to have the holes PRECISION drilled and tapped.

If I had a little math help, (logarithms?) I could BACK compute the knee freequencies given crossover at 600hz and the slopes. I should be able to, anyway.
Too much is never enough

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