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Twisted Zistors

NeisNeis
in DIY

I'm about to start gathering the parts to build a pair of Jeff Bagby's "Woofer modules" and realized that apparently "Twisted Zistors" were a proprietary line from Meniscus. So I could use some informed opinions about resistors.
The valus I need are 3 and 10 ohm, 25 watts.
Firstly, why do you suppose he specified them? And secondly is there something else that would work as well in that application? And would it matter?
Thanks very much for any help.

Comments

  • trawtraw
    edited May 7

    Image the 3 ohm, value resistance value might vary to get to your liking. Guessing if parallel some 10watt'ers for that spot would be fine - can't remember if the resistor before cap seeing more bandwidth, but still question that as the cap should limit overall draw of the 2 way's network at the lower frequency I believe. For the 10 ohm shunt to flatten impedance, could prob go with 4 10w 10ohms, (10+10)||(10 + 10), though believe there are 25watt-ers out there at PE.

  • a4eaudioa4eaudio

    Yes, Parts Express has done 20 watt resistors now.

    https://www.parts-express.com/Dayton-Audio-DPR20-3.0-3-Ohm-20-Watt-Precision-1-Audio-Grade-Resistor-007-3?quantity=1

  • trawtraw

    One other thing, had done the CSS bass module with some criton 1td's some time ago before jumping deeper into diy'ing speakers. If were bi-amping and know the input impedance of amp for top end, if were say 47k (common), could just series a 0.022uf (22nF) cap at line level to create 6db centered at ~150Hz (1/2piRC) and still use the passive LC low pass, then still have level matching to deal with and all that starts getting into active-passive hybrid and generally easier to have simply plug n play complete speaker passively especially in a fam room surround setup

  • DrewsBrewsDrewsBrews

    There was a double post so I'll post my reply here

    Madisound carries big 25watt sand cast: https://madisoundspeakerstore.com/wirewound-25-watt/

    Looks like they carry 10ohm, but only 2.7ohm or 3.3ohm. .3ohm in either direction probably won't make much of a difference unless padding down something like a high sensitivity low impedance tweeter... And even then I bet the difference would be pretty minimal.

    Though they also have 6ohm 15watt. Wire two in parallel for 3ohm 30watt capacity.

    https://madisoundspeakerstore.com/wirewound-15-watt/6-ohm-15-watt-wirewound-resistor/

    Neis
  • jr@macjr@mac

    I'll be that guy... the 25W rating on those type of resistors is contingent on being installed on something that will dissipate heat - such as a metal plate. If we are talking normal breadboarding, their power handling is reduced quite a bit. We are overthinking things here. Normal 10W resistors will be a fine substitute.

    6thplanetNeis
    I have a signature.
  • kenrhodeskenrhodes

    I don't disagree with JR, but for the cost I would just parallel a few sand cast and never worry about it again. Not that I should be worried, I don't know of anyone that has blown a resistor before a driver, I've just seen them get really warm. :o

  • rjj45rjj45

    What was that guy a few years ago - Dave Pellegrene? Built a pair of Statements and actually smoked a resistor. So it's possible, I guess.

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • WolfWolf

    Yep, Dave Pellegrene, Mini Statement towers on Queen live DVD.

    InDIYana Event Website

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