Subs R' Us.

Discussion in 'Archived Threads 2001-2004' started by Jack Gilvey, Aug 30, 2002.

  1. Jack Gilvey

    Jack Gilvey Producer

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    It's fun to be on vacation. As I type, I've got an IB sub(with a single Adire DPL12 and a 128ft^3 closet), a dipole sub( pair of DPL12's), and a PR sub (Dayton DVC,Lambda PR) operating in my room. All I do is move the speaker cable from the amp (Adire AVA250) to the sub I wanna use. Really interesting differences in sound and response. I'm finishing up a vented Shiva EBS for a friend, so I'll then have all the bas(s)es covered.


    I did a quick, informal (RS meter w/ corrections, Sterophile Test cd1) FR comparison between the dipole and IB and found that, while the DPL12 infinite baffle was pretty damn flat over the last octave (actually up a little @ 20Hz referenced to 40Hz), the dipole fell only about 6dB down over the same octave (agrees with the theory, I guess). For these measurements, I'm only using one voice coil of each DPL12, so the Qts of the woofs is about 0.8. Really tough to get a feel for "smoothness" this way, since it's such a crude method.


    "I'm a loser. I'm a loooooo-ser".
    -John Lennon
     
  2. Jack Gilvey

    Jack Gilvey Producer

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    Alrighty, done with the EBS. Just about 141L with a full-length 4" flared port. Sounds great thus far, but we're having our inaugural viewing of The Fellowship of The Ring this evening, so that'll be telling (what a way to break in a sub,eh?).
     
  3. Pete Mazz

    Pete Mazz Supporting Actor

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    Yea Jack, you'll know right away what kind of cahones it has with that soundtrack. I'll bring popcorn! [​IMG]
    Pete
     
  4. Shawn Solar

    Shawn Solar Supporting Actor

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    Ahh, that was the first movie I used to test my new DIY 1503. You never forget your first[​IMG]
     
  5. Jack Gilvey

    Jack Gilvey Producer

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    We did good. [​IMG] Thing performed like a champ @ 10dB below reference in my small room (~1400ft^3). Damn, there's low sh*t all over that DVD, and the EBS seems to get it all (powered with an AVA250).
    Incidentally, I wound up not using the Sonotube I got, I went with an MDF box. Never again, too friggin' heavy.
     
  6. Pete Mazz

    Pete Mazz Supporting Actor

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    Man, Pat's buildin boxes....Jack's buildin tubes....What's the world comin to? [​IMG]
    Pete
     
  7. Jack Gilvey

    Jack Gilvey Producer

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    Hey Pete, those black fine-thread screws you sent worked like a charm on the MDF...no T-nuts this time, a real quickie this one. Even the port is duct-taped till I finalize the Fb.
     
  8. Wes Nance

    Wes Nance Stunt Coordinator

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    Jack,

    How does the PR sub hang in there? I know it has a higher tuning, but would be interested in your impressions on the quality/character of the sound compared to the other offerings.

    You really should snag a picture and post it of all those subs in the same room!

    Wes
     
  9. Jack Gilvey

    Jack Gilvey Producer

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    Hey Wes,
    The PR hangs in there just fine. [​IMG] The EBS definitely digs deeper (at over twice the Vb, of course), but I haven't really gotten to compare them on music at all.
     

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