What to do with the Parts Express "1$" 269-469? - diyAudio
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Old 5th October 2006, 02:12 AM   #1
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Default What to do with the Parts Express "1$" 269-469?

Someone's selling a bunch of the "No Steeinkin' Badges" 269-469 drivers on the Trading Post section. I think I was the first person to offer to buy them.

So, what do I do with 18 of them? They seem to have a F/S of about 120hz, and are pretty flat from 130hz to about 16khz.

Tempting as a line aray is, I don't have a very large room. (I'm about 5-6' tops from each of my speakers.) Something that runs off of a T-amp is ideal, of course.

As a side note, I have access to a CNC router (WOOT!), and a place to sell speakers, so long as they're technically "art". If I were to make a speaker that was constructed primarily out of PVC pipe, and easily duplicated, I could make a very large profit, and as a student, profit is a good thing.

Someone said that the 269-469 works very well when coupled together in opposite directions, with one driver firing back and the other forwards. (They're wired in opposite phase). Although I'd probbably screw up trying to attach the drivers together, just placing them in opposite directions seems to work pretty well.

http://www.t-linespeakers.org/FALL/bipolar/index.html

So, what should I build? PVC pipe has been successfully used with TLs, although baffle step loss (which I don't entirely understand) seems to be a problem. And the bass is lacking horribly; how should I add more bass? (A single subwoofer for both speakers?)
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Old 5th October 2006, 02:34 AM   #2
MPM is offline MPM  United States
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I tried the PCV pipe with some of the NSB's. Was OK sounding at low volumes in the TL as background music. Sealed? Well, it made some noise. Wasn't great but wasn't bad. The reason I'm selling my remaining NSB's is to buy some proper full range speakers, or atleast as proper as they can get. Some Fostex or the Seas T18RE coaxials are in my next project. My wife never fully appreciated the concept of a line array on either side of the television. Go figure!
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Old 5th October 2006, 04:17 AM   #3
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Quote:
Originally posted by MPM
I tried the PCV pipe with some of the NSB's. Was OK sounding at low volumes in the TL as background music. Sealed? Well, it made some noise. Wasn't great but wasn't bad. The reason I'm selling my remaining NSB's is to buy some proper full range speakers, or atleast as proper as they can get. Some Fostex or the Seas T18RE coaxials are in my next project. My wife never fully appreciated the concept of a line array on either side of the television. Go figure!

Hmm...

Anyone else have any ideas? I have a pair of Cambridge Ensemble 1's (the ones with the two sattellites and two woofers in seperate cabinets), and would like to upgrade to a more efficient system.
(For a first project, it's hard to beat the price!)
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Old 5th October 2006, 04:27 AM   #4
renfrow is offline renfrow  United States
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I resized the diyAudio reference project monopole TL (outside dims, using 3/4in MDF: 6.5in wide * 9in deep * 18in tall) and used the NSB in it. These turned out fantastic, everyone that hears them loves them!

Tom.
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Old 5th October 2006, 05:39 AM   #5
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Quote:
Originally posted by renfrow
I resized the diyAudio reference project monopole TL (outside dims, using 3/4in MDF: 6.5in wide * 9in deep * 18in tall) and used the NSB in it. These turned out fantastic, everyone that hears them loves them!

Tom.


Sweet! Got any pictures?

(Now, to persuade the owners of the CNC machine to let me use it!)

Just checking - the inside dimensions are 5" (vs. 6" for the originals), 16.5" tall (vs. 16 and 3/8" for the originals), and 7.5" deep (vs. 8.75" for the originals). What about the L-shaped bit on the inside? Is it scaled directly?
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Old 5th October 2006, 01:17 PM   #6
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http://www.partsexpress.com/projects...e/nsb/nsb2.htm

Everything from a single driver system to a line array.
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Old 5th October 2006, 04:31 PM   #7
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The "Dan-B Mini T's" on the Parts Express project page appear to have a good frequency response down to 20hz. Am I misreading this?
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Old 5th October 2006, 09:20 PM   #8
Dumbass is offline Dumbass  British Antarctic Territory
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What I would do:

Nine-per-side line arrays using something like 2/3/4 power tapering. Required reading:
http://www.audiodiycentral.com/resource/pdf/nflawp.pdf

Because CTC distance is 4", it is recommended not to operate the array above 3.39 kHz. So cross over to a single tweeter at 3kHz or so.

Put the arrays in sealed enclosures. Buy a cheap pair of powered subwoofers. Run the arrays full-range, and blend in the subwoofers.

IIRC line arrays partially mitigate the need for baffle-step correction. (Is this true?) Don't worry about baffle step for now.
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Old 5th October 2006, 10:07 PM   #9
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Quote:
Originally posted by Dumbass
What I would do:

Nine-per-side line arrays using something like 2/3/4 power tapering. Required reading:
http://www.audiodiycentral.com/resource/pdf/nflawp.pdf

Because CTC distance is 4", it is recommended not to operate the array above 3.39 kHz. So cross over to a single tweeter at 3kHz or so.

Put the arrays in sealed enclosures. Buy a cheap pair of powered subwoofers. Run the arrays full-range, and blend in the subwoofers.

IIRC line arrays partially mitigate the need for baffle-step correction. (Is this true?) Don't worry about baffle step for now.

Interesting idea. I wish I could listen to some of these so I can find out what they sound like!
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Old 5th October 2006, 10:57 PM   #10
Dumbass is offline Dumbass  British Antarctic Territory
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Quote:
Originally posted by Spasticteapot
Interesting idea. I wish I could listen to some of these so I can find out what they sound like!
Since you bought the drivers, may as well do something with them. Put together a quick-n-dirty prototype and start experimenting. Meanwhile, study the nflawp, and start thinking about what you want to do above 3k and below 100 Hz.
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