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Old 17th February 2009, 07:34 AM   #11
Pan is offline Pan  Sweden
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David,

have you considered a 300-400Hz crossing?

It would fill out the "floor dip", increase dynamics/reduce distortion and possibly give less problems with phase distortion in the 100-250Hz range which have shown to be an area of increased sensitivity to groupdelay.


/Peter
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Old 17th February 2009, 11:50 AM   #12
56oval is offline 56oval  Australia
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Quote:
Originally posted by David Gatti
Nice to see 56oval. What's the dimensions & drivers you're using?
Why did you choose 70 degrees? A lower angle would help with diffraction.

Hi david
The front baffle 300mm wide,700mm high & its @ 250mm deep I think .
Drivers 1st you can't please everyone so here goes
Raven R1 ,6.5"PHL 1120 & 10"PHL3020 bass I haven't decided it might be a 15" or maybe try multi subs .

The 70 to 72 degree angle came from a totally different industry and I know someone who has tried it and it worked ,most likely 50mm roll over could work just the same and easier .

Cheers

Mal
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Old 17th February 2009, 11:08 PM   #13
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Quote:
Originally posted by Pan
David,

have you considered a 300-400Hz crossing?

It would fill out the "floor dip", increase dynamics/reduce distortion and possibly give less problems with phase distortion in the 100-250Hz range which have shown to be an area of increased sensitivity to groupdelay.


/Peter
Yes Pan, at this early stage, I'm considering anywhere from 200 - 400 Hz.
I will have to do some simulations, and also figure out the optimum height for the woofer. Any suggestions on that? I'm in 2 minds, thinking fairly high for the best integration with the midrange (1st order crossover), but closer to floor for less floor bounce in the midrange.

560val, sounds like quite a nice efficient design. When do you start making sawdust?
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Old 17th February 2009, 11:44 PM   #14
56oval is offline 56oval  Australia
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Quote:
Originally posted by David Gatti


560val, sounds like quite a nice efficient design. When do you start making sawdust?
When I stop looking at more efficient design's and cabinet materials .

Cheers
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Old 18th February 2009, 12:39 AM   #15
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My next (re)build will be similar too - simply because I don't have the facilities to build Troels' PMS...

My last two builds used the same drivers, one in 300mm pipes, the other in wide but thin cabs, 500x170 - it was much easier to get BSC & driver balance right in the wide cabs (& they suit available space better)

I'm rebuilding my all Peerless system, (drivers from before the move to China) 3 way, this will be bi-amped, current xover 200Hz 1st order passive, but on Pan's suggestion I'll try higher.
I want to get the Baffle width & xover freq 'co-ordinated' so that I can tweak BSC simply by changing the level on the woofer amp

re 'optimum height for the woofer' - I don't like woofers too close to the floor, I seems to muddy up the sound a bit to me.
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 18th February 2009, 12:48 AM   #16
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Quote:
Originally posted by PeteMcK
My next (re)build will be similar too - simply because I don't have the facilities to build Troels' PMS...

My last two builds used the same drivers, one in 300mm pipes, the other in wide but thin cabs, 500x170 - it was much easier to get BSC & driver balance right in the wide cabs (& they suit available space better)

I'm rebuilding my all Peerless system, (drivers from before the move to China) 3 way, this will be bi-amped, current xover 200Hz 1st order passive, but on Pan's suggestion I'll try higher.
I want to get the Baffle width & xover freq 'co-ordinated' so that I can tweak BSC simply by changing the level on the woofer amp

re 'optimum height for the woofer' - I don't like woofers too close to the floor, I seems to muddy up the sound a bit to me.

Bi-amping would be nice, and I leave that as an optional upgrade further down the track.
I agree about the bass driver close to the floor tending to muddy the sound, and I suspect that's more about crossover interaction rather than floor bounce. Since the 12" woofer already has a 6cm or so depth, then you add the increased path length to the listener's ear, it's tough to compensate for it in the crossover.
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