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Old 23rd January 2006, 08:33 AM   #11
frugal-phile(tm)
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I'm a little late to this thread. Our BD-pipes have a champher on the back of the cutout... your freestyle effort probably has additional benefits in not being regular.

The best source of cotton felt in Canada is out of vintage Noresco speakers -- the ones with a "tweed" grill and the backs held on by Robertson screws. (as a side benefit they come with some nice isophons (sold on eBay a good source of funding towards the next project) or some Philips 5 or 7" whizzer cone drivers.

dave
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Old 23rd January 2006, 06:42 PM   #12
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Default Cotton Felt

I bought some felt from a furniture upholsterer. I posted a picture below.

The front drivers are still breaking in (the rear ones were used and already broken in). Once that is done, I will take a good listen. After I am use to the sound, I will drop in phase plugs.

So far, I am very pleased with the sound.

Cheers,
Gio.
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Old 24th January 2006, 02:17 AM   #13
chrisb is offline chrisb  Canada
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Default Bracing

Quote:
Originally posted by SCD
That whittling looks pretty good.
Remember to add lots of bracing. Cabinet resonance sucks and needs to be reduced as much as possible.
Use single strands of CAT5 wire (24 gauge) it looks skinny but do not worry "Thin is in".
Good luck


Due to the almost full length tapered divider, and the use of plywood, this enclosure is already very well braced side to side and stiff. If you haven't already permanently attached the side panel, all that's needed to complete the bracing would be a pair of vertically oriented 75mm or so wide pieces wedged between the center and front and back.
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Old 13th February 2006, 12:32 AM   #14
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I got a webpage up for this project

http://ca.geocities.com/gmilitano/Sp...s/BD-Pipes.htm

I purchased some phase plugs from Planet_10 and will try them out in a while when the speakers are fully broken in. I'll report back with the results.

Cheers,
Gio.
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Old 14th February 2006, 03:30 AM   #15
TerryO is offline TerryO  United States
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Quote:
Originally posted by GG
I got a webpage up for this project

http://ca.geocities.com/gmilitano/Sp...s/BD-Pipes.htm

I purchased some phase plugs from Planet_10 and will try them out in a while when the speakers are fully broken in. I'll report back with the results.

Cheers,
Gio.

Gio,
I couldn't help noticing that on your webpage that you stated that the upper midrange was a little forward. If you haven't installed the phase plugs you may find that this problem will disappear after you do. Your description seems to match what I heard on my 1197 "Black Box" speakers until Dave gave the drivers 2 thin coats of Puzzel Coat and installed his phase plugs. I might add that he was only too happy to do this for me (I had his car blocked in the driveway

). Seriously though, I thought they sounded pretty good before, but the improvement afterwards was very dramatic, even to these old ears.
Best Regards,
TerryO
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Old 1st March 2006, 03:27 AM   #16
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Default Measured Response of BD-Pipes

I have been playing around with an SPL meter and I came up with the following measurements of the BD-Pipes.

The attached plot shows measurements at 1 m so I have cut off readings below 1000Hz as I can't imagine they would be meaningfull. The measurements were made in a lightly furnished room 3.6 m X 6 m. The speaker was 1.2 m from the back wall and 1.8 m from the side walls.

The response seems very good with the exception of the spikes between 6 and 7kHz.

Response is very extended, dropping off slowly after 16kHz and dropping off very fast after 18kHz. These measurements are with the Planet_10 phase plugs. The plugs helped tame some, but not all of the upper mid-range brightness. To my surprise, the phase plugs extended the response by about 2kHz!

Other peoples measurements of the 40-1197 have not shown the peaks I recorded between 6-7kHz. I can't imagine the room would have any affect at that high a frequency and I don't think I did anything wrong. Any comments?
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Old 1st March 2006, 04:12 AM   #17
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Default Re: Measured Response of BD-Pipes

OK. Now this is the one I need help with. This is the 20-1000Hz response at 3.5 m. I assume that a distance of 3.5 m is far enough away to pick up the port.

What is going on between 45 and 70Hz? Is that suck out of bass caused by the room? What about between 90 and 100Hz, is that also a room mode?

What about the drop after 250 Hz .. what does that mean? Is the enclosure too big for the drivers?

I have no idea on what is going on at 900Hz. I checked that reading several times.

Should I be looking to add more stuffing?

As always, comments are appreciated.

Cheers,
Gio.
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Old 1st March 2006, 08:18 AM   #18
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Default Re: Measured Response of BD-Pipes

Quote:
Originally posted by GG
Other peoples measurements of the 40-1197 have not shown the peaks I recorded between 6-7kHz.
You here about it, and i have seen measures that show it -- none as big as yours. Have you puzzlecoated your drivers?

dave
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Old 1st March 2006, 08:19 AM   #19
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Default Re: Re: Measured Response of BD-Pipes

Quote:
Originally posted by GG
What is going on between 45 and 70Hz? Is that suck out of bass caused by the room? What about between 90 and 100Hz, is that also a room mode?
Height of your ceiling?

This is actually fairly typical of in room measures in the bass. Move your mic over a ft either direction and see what happens.

dave
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Old 2nd March 2006, 04:18 PM   #20
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Can anybody point me to a site for plans...?

Google returns zip, nada. It's not on the BD site.

Millet's site is not available.

PDF, DXF, or DWG
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