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Old 20th June 2005, 03:20 PM   #1
heybobo is offline heybobo  United States
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Question B-D Pipes Plans

Hello,

I am trying to find plans for Bert Doppenberg's TQWT "B-D Pipe" enclosure for 2 x Fostex FE 103 or RS 40-1197. They are no longer available at his website.

Any assistance would be appreciated.

Cheerio
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Old 20th June 2005, 04:11 PM   #2
amt is offline amt  United States
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Hi,

I have all the diagrams/photos and will send them via email.

amt
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Old 20th June 2005, 04:30 PM   #3
GM is offline GM  United States
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Greets!

http://www.pmillett.com/tqwp.htm

GM
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Old 21st June 2005, 02:31 AM   #4
chrisb is offline chrisb  Canada
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Default BD Pipes

A few pieces of advice from a guy who has built 6 or so pairs:

baltic birch plywood
Fostex driver break-in ( 200-300 hours)
Planet10 phaseplugs on the front drivers
series wire for 16 ohms
parafeed SET


With careful room matching/placement these are quite tuneful. I found the filter unnecessary myself, and with the right driver (Dave's Foster FE103Alnico), no tweeter required
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Old 21st June 2005, 04:41 AM   #5
TerryO is offline TerryO  United States
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Chris,
Have you (or anyone else) used a pair of 1197 "Purple Box" drivers for the rear? I guess I'm wondering if they would be useful paired with 1197 "Blue Box" front drivers.
Best Regards,
TerryO
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Old 21st June 2005, 07:09 AM   #6
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Quote:
Originally posted by TerryO
Have you (or anyone else) used a pair of 1197 "Purple Box" drivers for the rear? I guess I'm wondering if they would be useful paired with 1197 "Blue Box" front drivers.
Chris and i have used all the flavours... gold & black box, blue box, purple box (both Canadian & US varieties). Lower Fs drivers tend to load the pipe better (it is quite long), so this tends to favour blue box or gold box, but i have found that box colour only tells you what Fs is most likely to expect. I've purple box that have measured 80, and many of my blue box measure 105 (and one that measured 140).

Next, i'm going to try a quad of 40-1022s (+ tweeter).

dave
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Old 24th June 2005, 08:05 AM   #7
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Default Series wired ?

ChrisB,

What is the difference (sonically) between wiring the drivers in series (16 ohm) vs parallel (4 ohm)

Regards
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Old 24th June 2005, 03:05 PM   #8
chrisb is offline chrisb  Canada
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Default Series / parallel

quite amplifier dependant - on my current DIY monoblocks ( RH connected EL84, with parallel feed output and EF86 triode drivers) with only a a single secondary tap, seems to be tighter more articulate from mid-bass & down
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