Thiel-Small Parameter Search [message #47630] |
Thu, 01 September 2005 07:15 |
Spinjack
Messages: 100 Registered: May 2009
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I have two Radio Shack 40-1034 drivers that I'd like to use to build a subwoofer but I'm not having any luck finding the T-S parameters for it. Any suggestions on where to look? Also, any hints as to how make these sound good? I've read that they can be a bit sloppy. I don't need them to be "audiophile" quality since they will be used in a furnished breezeway to supplement some homemade bookshelf speakers that the 7pi's will be replacing. My plan is to go the Isobaric (sp?) route and I thought about matching them to one of those subwoofer amps available from Parts Express (either that or an older NAD amp I bought on eBay). I don't want to go horn because of size contraints, but I though about a tower configuration to minimize footprint if the required box volume was too high. Any thoughts?
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Re: Nothing [message #47647 is a reply to message #47643] |
Fri, 02 September 2005 07:13 |
Spinjack
Messages: 100 Registered: May 2009
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Yeah, that was the direction I was going to go. I'm not sure how I will do Vas, though. I'm not sure I want to build an extra enclosure. If I did build it, I'd want to do it such that I can mount anything from a 6.5" up to an 18" driver. Can you recommend some signal generation software for the PC? I don't have an oscilloscope, so I'll be restricted to an RMS DMM, but from the research I've done it appears that I should be able to get pretty close.
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Re: Thiel-Small Parameter Search [message #47653 is a reply to message #47630] |
Fri, 02 September 2005 22:29 |
GM
Messages: 114 Registered: May 2009
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Greets! These are car audio 'IB' sub drivers so OB, very large sealed, or aperiodic is best, with the latter yielding the highest SQ. It's specs are ideal for a 'classic' stuffed TQWT and going isobaric will keep the line's CSA reasonable, so 12" square (inside dims) should work fine and a ~93.63" pathlength will tune it to ~30 Hz if stuffed along its length with ~48 oz of R-19 fiberglass. The beauty of this design is that the specs can be off quite a bit and still perform well by adjusting the amount of stuffing. Catalog specs: Fs = 30 Hz Vas = 6.83 ft^3 Qts = 1.04 Pe (RMS/max) = 75/150 W sens = 88dB/W/m (+/- 2 dB) nominal 8 ohms GM
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