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  1. Jason Padrick

    Tumult vs Titanic?

    Hmm, a mini parthenon motor and spider bolted to a tumult cone? I'll just keep on dreaming.....:)
  2. Jason Padrick

    TS parameter checking

    Can anyone help me out here? :frowning:
  3. Jason Padrick

    Confusion about sub magnet

    Hmm, interesting. Their subs only have 9 oz. of magnet, where other sub drivers have hundreds of ounces for ferrite. Just checked out their site. Don't look too shabby.
  4. Jason Padrick

    Confusion about sub magnet

    How about AlNiCo magnets? Those are supposed to be pretty good too right? Don't see anyone making subwoofers with Neodymium or AlNiCo. This because of cost considerations? *Insert newb alert*
  5. Jason Padrick

    Suggestions for auditioning material

    Well, I'll just pitch in my suggestions here: Aaron Copland: Fanfare for the Common Man (dynamic range up the kazoo) Bach's Toccata Con Fugue in D Minor (good organ stuff) Peter Green: One Woman Love (bass track from heck) ;)
  6. Jason Padrick

    TS parameter checking

    Ok, I've been playing a lot with WinISD lately with midranges and bass drivers, and think I can draw some conclusions on how stuff works. It'd be nice if people could check me on this and help me out. Qes = the higher the better for sealed boxes (what I'm interested in), I noticed that higher...
  7. Jason Padrick

    Sub efficiency question

    Actually I have an older version of it (2nd or 4th) at home. I think I need to dig it out and read it cover to cover again. Same with Cohen's (sp?) book. I was just thinking that efficiencies below 87dB seemed a little odd, and wanted to know why that is. Apparently, from the above posts...
  8. Jason Padrick

    Sub efficiency question

    Well, performance inside a box is much more useful. I was interested in what makes a high efficiency driver versus low efficiency. I know that adding mass to a cone makes the resonance lower as well as decreases efficiency. A lower mass cone has a higher efficiency but less extension. What...
  9. Jason Padrick

    Sub efficiency question

    I would guess that the low bass output of a DPL12 would be higher than a higher efficiency driver because of its lower resonance. I haven't modeled it at all yet though. This helps a bit, but what about the efficiency as rated not inside a box?
  10. Jason Padrick

    Sub efficiency question

    So many of the newer high excursion drivers have a low efficiency because they are designed to work in small boxes? Is that what you're saying? So woofer systems that play "both low and loud" require a larger box, assuming a sealed system?
  11. Jason Padrick

    Why 12" drivers can't be musical in the 40-80hz?

    I gather from this that subs can reach linearly above 80Hz, but they have the flattest response from about 30-80. I looked back on my Titanix 10" and 12" spec sheets and they both start to roll off after 80Hz by a few dB.
  12. Jason Padrick

    Sub efficiency question

    Hi, I've been looking at these drivers lately, like the Stryke AVs, the DPL12, and others, and they all have fairly low efficiency, like less than 86db/W. Why is that? What is technically going on there? P.S. Yes I'm noob, but I am curious.
  13. Jason Padrick

    Driver comparison

    Thanks. What about why the higher efficiency of a smaller driver with a smaller cone? I still don't understand that.
  14. Jason Padrick

    Driver comparison

    I have a question. I've been looking at drivers, and something puzzles me. I look at this woofer: http://www.partsexpress.com/pe/showd...ID=16239&DID=7 and I look at the Tumult: http://www.adireaudio.com/diy_audio/...ire/tumult.htm The Peerless has about 3.5dB more efficiency at 1W...
  15. Jason Padrick

    Resonance chamber?

    I think a Helmholtz resonator sounds like the same idea. But if it rings why would they use it? Could they be made of wood?
  16. Jason Padrick

    Resonance chamber?

    These resonance chambers I was talking about I think are what you are saying Mr. Forman. These chambers are big enough for people to stand in. I should look for an acousitcal engineering course at school when I'm in upper division. Sounds interesting.
  17. Jason Padrick

    Resonance chamber?

    Wow, that's a HUGE horn. Think of the group delay.... The resonance chamber I was thinking of has no active drivers. I think it's just an open box in the roof. Just to help amplify live musical performances.
  18. Jason Padrick

    Resonance chamber?

    Hi guys, This is actually my first post here, and this may be a noob question too, so bear with me. I am interested in building speakers, but haven't yet (my dad's K-horns rock though, I know that much). In large auditoriums I've heard of a term "resonance chamber" used in order to...
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