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Old 26th May 2009, 11:42 AM   #221
Vix is offline Vix  Yugoslavia
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Uhm...yes...well...Nelson, what happened with Open Baffle articles?
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Old 26th May 2009, 07:13 PM   #222
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BOB, the Big Open Baffle Project, is on track. The writing on the
first installment (one of several) is done, and I spent some time
last weekend tarting up the diagrams.

I plan to send it to AudioXpress, and of course they have a lead
time...

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Old 27th May 2009, 03:06 PM   #223
Vix is offline Vix  Yugoslavia
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Any chance that any of these articles will be about a SOB ?(Small Open baffle)

p.s. Oh, no, that't too sad....better call it KOB (Klein Open Baffle)

And..off topic question: Have you tried multiple 8" speakers (as bass helpers)on a baffle versus one 15"? Was it worth it?

Regards,

Vix
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Old 27th May 2009, 06:24 PM   #224
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The work has included comparative measurements of different sizes and
draw a few conclusions on the subject. The smallest width baffle I have
played with is 16".

And as to multiple 8", I have tried up to 20 per side. They all work fine.

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Old 28th May 2009, 03:17 AM   #225
fff0 is offline fff0  Singapore
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Hi Nelson,

Hows the 16" baffle? Care to comment?
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Old 28th May 2009, 11:01 AM   #226
Telstar is offline Telstar  Italy
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Quote:
Originally posted by Nelson Pass
The work has included comparative measurements of different sizes and
draw a few conclusions on the subject. The smallest width baffle I have
played with is 16".
Good: that's my size
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 28th May 2009, 06:21 PM   #227
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Quote:
Originally posted by fff0
Hows the 16" baffle? Care to comment?
On the plus side, the smaller baffles tend to have a spacious sound and work
well with smaller rooms. On the minus side, they work the woofer harder,
require a higher crossover frequency, and suffer more from the cancellation
which occurs when the back of the driver is one wavelength from the front
of the driver. This cancellation is alleviated a bit if you offset the driver, but
then you cut into the apparent width and you start thinking about some sort
of side panel.

We took a pair of baffles like this to RMAF in 2007 with PM6A's and pairs
of SEAS W26 woofers, biamped and equalized. They worked well, but if
you have the space, a little bigger is better.

One thing you can do if you are constricted on width is make them a little
higher. I find baffles with the FR near the top edge are problematic, so I
usually think in terms of driver height at 3 ft or so and top edge at 5 ft, and
this gives a little more bandwidth to the FR.

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Old 28th May 2009, 06:33 PM   #228
Telstar is offline Telstar  Italy
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Quote:
Originally posted by Nelson Pass
One thing you can do if you are constricted on width is make them a little
higher. I find baffles with the FR near the top edge are problematic, so I
usually think in terms of driver height at 3 ft or so and top edge at 5 ft, and
this gives a little more bandwidth to the FR.

Yes!
That's what I did. Additional baffle height works like a little extra width in regard to the response curve.
From my simulations for 8" drivers about 30-40cm above the *driver center* looks the best.
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Old 29th May 2009, 07:04 AM   #229
fff0 is offline fff0  Singapore
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Hi Nelson,

Thanks for sharing.
When you mentioned a little bigger is better, how big is a little bigger that you are referring to?

Whats the height of ur 16" baffle? If mine is the 5nf, wat will be the main things that I will need to look out?

For the pair of baffle at RMAF 07, can I know how did the guys managed on:
1) sensitivity difference? thru Active crossover or simply equalise it thru equaliser?
2) Time and phase alignment?
3) Are the woofers wired in parallel?

Above question can be reference to your system if you dont remember the RMAF configuration. Thanks in advance.

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Old 29th May 2009, 11:41 AM   #230
Vix is offline Vix  Yugoslavia
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Hi Nelson,

Thank you for sharing. In the end, everything comes to BiB. Bigger is better , baffle too. However, with some sorts of music I can't get full enjoyment through my 50 cm wide OB's...
Ideally, I should have two set of speakers:

1. OB's
2. Horns (BIB's)

In your analogy that would be like having both BOB's and Klein Horns...
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