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  1. #26
    Forum Regular
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    Quote Originally Posted by Poultrygeist View Post
    Great looking speakers!

    cubdog
    Bel Canto M300 mono blocks
    Bel Canto DAC1.5
    Squeezebox Touch
    Klipsch RF7II

  2. #27
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    Home Of The Fighting Gamecocks
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    thanks cubdog

  3. #28
    You play. I listen. Enochrome's Avatar
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    Jan 2010
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    Best Coast
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    Poultry,

    If I wanted to make an OB design out of the drivers I have now, I would have to box the mid driver because it is not fullrange and the QT's are off.

    These are the drivers I was thinking of using:

    2 x 1" Titanium Vifa Tweeters

    2 x 6.5" poly mid drivers (company not known; they came from a pair of Dahlquist DQ-18)

    2 x 10" CT Woofers that came from a pair of Rectilinear 3 High Boys.

    Would be possible to build an OB with the woofer and tweeter open and the midrange closed? or is that self defeating and I should just buy a pair of fullrange 6" drivers?

  4. #29
    AR Newbie Registered Member
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    Dec 2011
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    1
    Hi Poultrygeist,
    Can you give me any plans and or suggestions on building a pair of these?

  5. #30
    Forum Regular
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    Plans for Open Baffle

    Baffle size 20" wide X 38" tall ( Home Depot will make these cuts when you buy their 3/4" plywood ) Mine are 19X38

    Woofer ( Alpha -15A ) centered 10" above bottom edge ( hole size 13.77" )

    Full range driver centered 32" above bottom edge and shifted 2" off center ( Betsy hole size 7 3/4" ) $100 per pair @ Wild Burro Audio

    Pair constructed mirror image of each other

    Parts: two Alpha 15A ( Parts Express # 290-407 ) @ $64.99 each
    two 80Hz XO ( Parts Express # 266-442 ) @ $17.69 each
    3/4 " plywood from HD ( half sheet may be enough )
    4 large L bracket for feet if you want a simple build
    16 guage hook up wire and blue female solderless
    connectors
    Pan head screws and adhesive backed foam window
    stripping for driver gaskets
    Lowe's speaker binding posts ( discard plastic keystone )

    Other great full range driver options : Dayton PS220-8 Point Source driver ( Parts Express # 295-346 @ $109.49 each ). The Tang Band W8-1808 is my top choice but they are $250 each at Parts Express

    Martin J King's helpful link:

    http://www.quarter-wave.com/OBs/OB_Design.pdf

  6. #31
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    Enochrome,

    Low Qts. driver ( under .5 ) usually indicates a stiff cone suspension
    High Qts. driver ( above .5 ) usually indicates a loser cone suspension

    A stiff cone suspension while perfect for a box speaker will not sound good in open air it's too rigid to move enough air. I think your mid drivers have low Qts. and are meant for enclosures. It's possible the woofers could be used if their Qts. is above .5. I'm playing with some 16 inch woofers from an old Sansui XP because they have F.range printed on the magnet and their suspensions seem flexible. Your tweeters may work but they need to be 8 ohms and have a sens. rating in the high 90's.
    Last edited by Poultrygeist; 12-11-2011 at 06:06 AM.

  7. #32
    AR Newbie Registered Member
    Join Date
    Apr 2014
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    1
    What's the purpose of the little shelf at the top of the speaker? Just to add a super tweeter or something else?

  8. #33
    Forum Regular blackraven's Avatar
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    St. Paul, Minnesota
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    Quote Originally Posted by fsdaron View Post
    What's the purpose of the little shelf at the top of the speaker? Just to add a super tweeter or something else?

    I am not sure if PG still posts on this forum.
    Pass Labs X250 amp, BAT Vk-51se Preamp,
    Thorens TD-145 TT, Bellari phono preamp, Nagaoka MP-200 Cartridge
    Magnepan QR1.6 speakers
    Van Alstine Ultra Plus Hybrid Tube DAC
    Martin Logan Original Dynamo Sub
    Parasound A21 amp
    Vintage Luxman T-110 tuner
    Magnepan MMG's, Grant Fidelity DAC-11, Class D CDA254 amp
    Monitor Audio S1 speakers, PSB B6 speakers
    Vintage Technic's Integrated amp
    Music Hall 25.2 CDP
    Adcom GFR 700 AVR
    Cables- Cardas, Silnote, BJC
    Velodyne CHT 8 sub

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