Speaker Asylum

Dahlquist DQ-1W Modification

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Zipp

I've got two DQ-1W speakers hanging around gathering dust. Woofs are in excellent condition. I would like to know if I were trying for more efficiency and willing to take a hump in frequency response around 55Hz or so, could I use the original setup and port them using cardboard or pvc tube. If so, how can I find out how to do this that is in some way semi scientific. I'm not making a piano here, just want a pair of woofs that I can use in a second system.
I'll drive them with a Dahlquist LP1 active crossover and a pair of old Kenwood L05M mono 100 watt amps. Top end will be a pair of Sequerra Met 7 monitors.
Any insights, great or small would be appreciated. Thanks......

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Re: Dahlquist DQ-1W Modification - R. Hertz 12:32:26 09/29/01 (3)
First of all, I wouldn't recommend the modification you're contemplating. The DQ-1W's sounded pretty damn good just as they were. BUT, if the urge to modify them has overtaken you, then the first thing to do is find the Thiele/Small parameters of the woofer. The best way is to measure them yourself or have someone else do it if you don't have the equipment necessary. What you'll probably find is venting a woofer designed for use in a closed box will require an enclosure roughly twice as large as your existing one.
How 'bout this as an alternate suggestion: Sell the Dahlquists as is on e-Bay and use the proceedes to build one of the sub DIY projects available from ACI, Parts Express, Madisound, Meniscus, Shiva, Stryke, or Hsu. I think that would work out better in the long run.
- SELL: Dahlquist DQ-1Ws - hifitommy030880 13:25:19 09/30/01 (2)
  right you are DICK,
  as stock dq merch, they are more valuable. SOMEONE will be more than happy to get them, use the proceeds for another sub, ?sunfire used, velodyne used, etc.
  aside from the preservation of the DQs, which mate well with their intended partners, the results will be wayyyyy more predictable with another unmodidfied sub.
  sayyyyy dick, why dont you register? we could loook at YOUR system which i believe is a valuable feature as well as the 'automagic' feature which you dont have to register for. id like that at AR so i can tell when the chihuahuas are about. ;^)
  - My system is very modest. - R. Hertz 18:36:10 09/30/01 (1)
    My 2-channel system consists of a Linn Pretek pre-amp, bi-amplified with a vintage, built by yours truly, Hafler DH-200 (slightly modified) and an Adcom 545 amplifier, with an active DeCoursey Engineering crossover. My speaker system consists of a pair of two-way homebrew Scanspeak/Morel satellites crossed over to a pair of Peerless 12" subs. Sources are an oldie but goodie Harmon Kardon T-60 turntable with an Audioquest AQ-404 cartridge, and a Marantz CD-63 CD player.
    - modest. but well thought out and - hifitommy 06:29:28 10/01/01 (0)
      ill bet satisfying. thanx for the answer D. havent built anything but have had lots of stuff and gained some experience with biamping.
      
      ......regards.....tr

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