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Old 30th July 2003, 08:55 AM   #31
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Thanks for the input..

So I guess I will just have to "Just do it!" and report back to you with the results.

Thanks for pointers all.

Regards,
Bas
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Old 30th July 2003, 12:17 PM   #32
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Default Just did it!

Just ordered 16 * MCM 55-1870. Wish me luck. Any suggestions for the size of the enclosure per woofer?

Ported? I saw on the whamodyne files a port of only 3/4" wide by 3/4" wide?
Doc has 2 ports in the bottom..Only the bottom 4 ported?

Planet 10 any tips?

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Bas
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Old 30th July 2003, 01:17 PM   #33
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Bas, do you know what the T-S specs are for these drivers? The price seems phenomenal, and I've had my eye out for drivers for a line array I've been wanting to build.
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Old 30th July 2003, 01:24 PM   #34
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Hi Sy,

Found this via google..

Thiele-Small Parameter(Herstellerangaben)
Nennimpedanz/Gleichstromwiderstand: 8/6,4 Ohm
Resonanzfrequenz: 50 Hz
Gütefaktoren(Qms/Qes/Qts): 1,87 / 0,51 / 0,40
Äquivalenzvolumen(Vas): 9,8 Liter
Effektive Membranfläche(Sd): 75 cm²
Schwingspulenüberhang(Xmax): 1,3 mm

Cheers,
Bas

Interesting post by Ed Fallon (Part of the post)

....... The metal cone has resosance break up modes above 5khz which can be annoying. A well designed second order crossover around the 3khz range will work much better with this driver combo. If you are also using the same tweeter as Doc B., you will of course need to pad this down a few db as the 4 mid bass drivers will be maybe 92db 1w/m. Second order work well on the hi pass too. I'd put an adjustable lpad in at first so you can adjust it to taste and replace with a resistor lpad later.
This combo can be made to sound great as many Bottlehead customers have found. Doc has spent quite a bit of effort getting his S8's dialed in and it's very evident in listening to them.
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Old 30th July 2003, 03:11 PM   #35
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For my use, they'll roll off at 400 Hz and I'd be using 32 of them, so this looks like it might be exactly what I'm looking for. Thanks!
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Old 30th July 2003, 03:17 PM   #36
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Hi Sy,

Glad I could be of some help! 32! Wow...looks like the ultrawhamodyne without the tweeter!

Another tip. The magnet and rest of the back are treated with a damping according to the bottlehead website.

Cheers,
Bas

http://www.bottlehead.com/valve/wham...les/page8.html
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Old 30th July 2003, 03:27 PM   #37
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A bit, yes. Mine will be a dipole and only have to go down to 75-80 Hz or so. I'd love to know how (or if) the whamo designer took care of polar pattern and power law mismatches between the woofers and the tweeter. Thanks for the link.
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Old 30th July 2003, 03:33 PM   #38
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Hi Sy,


Quote:
of polar pattern and power law mismatches between the woofers and the tweeter
That sounds like gibberish to me

But there seem to be diffraction "issues" for instance a wider baffle or wings..such as on the "next" page ie. page 9 seem to benifit the sound of a box in this case. Where my natural inclination is to make a box as narrow as possible.

Anyway I would love to be kept updated on your progress.

Regards,
Bas
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Old 30th July 2003, 03:44 PM   #39
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Been reading up a little...

If passive line level EQ is possible..I might just go for a dipole as well. (I thought the EQ was done by an added piece of active electronics)

Sy ....how are you going to do the EQ?

Also anyone..do dipoles subjectively sound as "fast" as conventially loaded speakers?

Cheers,
Bas
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Old 30th July 2003, 03:48 PM   #40
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Dipoles just sound... different than point source speakers. "Fast" is not the way I'd describe the difference.

I'm a proponent of active EQ, and that's how my columns will be driven. When I have more time later, I'll explain the gibberish part.
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