Active SEOS12 + BMS 4550 + Eminence 12" DA

Discussion in 'DIY Speaker & Subwoofer Building' started by neo_2009, Apr 13, 2016.

  1. neo_2009

    neo_2009
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    Due to personal time constraints, i'm not entirely sure if i will be able to proceed with this experience. Nevertheless, i want to plan everything, because i would really love to try this :)

    If i do, the main purpose will be gathering knowledge and experience.
    As a secondary purpose, i'm counting the speakers will be able to surpass in dynamics and voicing accuracy mt actual XTZ 99.26 (NeoCD 3/Seas Excell 6.5") speakers.

    The crossover will be a miniDSP balanced.

    My knowledge on crossover theory is minimal, but i'm counting that as long as i'm able to take as many measures as its needed, with the help of others with much more knowledge than me, it should be possible to achieve a good result.

    The selected drivers will be:

    - Eminence DELTA-12A (8Ω)
    - BMS 4550 (16Ohm)
    - Denovo Audio SEOS-12 Waveguide

    The selected woofer will be the Eminence Delta 12A, available online as cheap as 70-80€.
    The reason to use this specific driver is cost, as this would be a first experience, and, as such, subject to failure.

    The BMS4550 will be use as a replacement to the B&C 250, as the price is the same and the BMS seems to be better.

    There is a Plan B available, as if the active experience doesn't go well, a passive crossover is available here, designed by Bill Waslo: SEOS12 with Eminence 12 Pro Woofers

    In the long run (2 years?), and if, by then i feel comfortable with the knowledge of designing an active crossover, the plan would be upgrading the woofer to a AE TD 12" with Apollo upgrade (and as TD drivers are used in 10.000$ speakers and are considered the best there is, there will be no need to update for a loooong period :))

    This speakers will be joining a dual (now single, but dual in the future) BMS 18" subwoofers, that can be crossed as high as 150Hz, and will be symmetric placed near the L/R, so maybe a higher crossover can be used.

    I've based the design of the speakers on @mattkhan DIY project, as i really like the angled baffle, so the speakers can be pointed directly to the user.

    The speaker dimensions will be around : 55cm Heigh x 35cm Deep, 40cm Wide.
    The final measures will be calculated so the waveguide can fire directly to the user ears, so i have to research what is the best way to optimize the waveguide/ear heigh relation.

    The box has taken into account the diferences in size between the Eminence and the AE drivers.
    If in the future the drivers are upgraded, and as the AE driver is a few mm wider, the woofer cutoff will need a slight thinning and nothing more.

    Front
    [​IMG]

    Front - x-ray
    [​IMG]

    Rear - x-ray
    [​IMG]


    PS: a big thanks to @mattkhan for the help with Sketchup project.
     
  2. mattkhan

    mattkhan
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    you might find The Good Vibrations interesting

    an eminence woofer and a SEOS 12, different CD to what you were thinking but one that has been used a few times and seems decent
     
  3. neo_2009

    neo_2009
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    Although it seems interesting, the CD seems to be of lower quality than the BMS.
    And the purpose, if everything goes as planned, is to build a base to a future "high-end" speaker, with the BMS and the AE.
     
  4. neo_2009

    neo_2009
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  5. neo_2009

    neo_2009
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    There's no turning back, 2 units of SEOS12 ordered from parts-express ebay store, 120€, including shipping and taxes, not bad at all!

    Should take approx. two weeks to one month, but i'm not in a rush, so no problem :)
     
  6. markymiles

    markymiles
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    Will be an interesting comparison to your XTZ as a well regarded cheap for what it is stand mount.
     
  7. neo_2009

    neo_2009
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    Yes, i agree.

    I'm hopping that the upper frequencies will be much better.
    I have a very lively room, so it would be interesting to verify the effect of the wave guide, toed in directly to the user.

    I know that the SEAS is a better driver than the cheaper eminence, but, as the eminence almost doubles the surface area, and with the characteristics of the PA drivers (low mms, strong motor, low LE, high sensibility), it should produce an interesting result.

    And its a speaker 100% dedicated to cinema, i rarely listen to music, and i'm counting with a very dynamic speaker :)
     
  8. neo_2009

    neo_2009
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    Anyone has an opinion regarding the best miniDSP to use in this scenario?

    I'm torn between the miniDSP 2x4 balanced x miniDSP 2x4 HD.

    Benefits of the miniDSP 2x4 balanced:
    - 100€ cheaper
    - if i cannot get good results, would be used with the DIY sub(s)

    Benefits of the miniDSP 2x4 HD:
    - newer platform
    - FIR filters
    - the usb port will make it much easier to take measures

    The FIR filters alone is a good reason to choose the miniDSP 2x4 HD, but in a near future (1-2 years), i will definitely upgrade to a Dirac processor, so in that case the FIR filters on the 2x4 HD will be redundant.

    On the other hand, the usb port will make measuring much easier ...
     
  9. mattkhan

    mattkhan
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    I would get the HD, FIR filters open up some opportunities that you might want to play with & it's not true that they are necessarily superceded by dirac as dirac doesn't do crossovers (atm). It's also better for subs anyway (greater precision should combat some of the LF filter IIR issues the existing one has, can output a larger voltage so no worries about ability to drive amps fully).
     
  10. Ringnut

    Ringnut
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    Surely the balanced 2X4 has the higher output - 4V verses 2V of the 2X4HD?
     
  11. neo_2009

    neo_2009
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    The 2x4 HD has "Unbalanced analog audio inputs switchable with a jumper between 4Vrms and 2Vrms"
     
  12. mattkhan

    mattkhan
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    Fair point. I was thinking of the unbalanced as the 2x4hd is unbalanced only. If you really need balanced and FIR then you would need the opendrc model. 2V should be sufficient anyway.
     
  13. neo_2009

    neo_2009
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    And here is the SEOS 12.

    [​IMG]

    [​IMG]

    For a better perspective:

    [​IMG]

    Its almost as big as the XTZ, and they are not as small as other speakers :rotfl::rotfl::rotfl:

    [​IMG]

    The DIY 18" in the background :)
     

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