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Singing the praises of my modified Avatar SB112 with midrange driver

Discussion in 'Amps [BG]' started by daveman50, Oct 21, 2012.

  1. daveman50

    daveman50 Supporting Member

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    I posted about this recently - yanking the tweeter from an older Avatar 1x12 cabinet with a Delta 12LF driver, and installing an Eminence LA6-CBMR 6-1/2" sealed back midrange speaker and an Eminence PXB:1K6 high pass board.
    http://www.talkbass.com/forum/f15/need-help-wiring-replacement-high-pass-filter-avatar-cabinet-mod-924361/index2.html
    This is an idea that's been kicking around TB for years. It was an easy mod (once I got good advice here on wiring up the board).

    I've been gigging and rehearsing with this baby, and it's a champ. My amplifiers' tone controls work in a way that's new to me - real tone-shaping in the upper midrange. It's very flexible in bringing out good tones with different basses. (It does what I always expected a tweeter to do but they never did.) It weighs 50 lbs. I am just digging the tone options. If you can find one of these older (non-neo) Avatar cabs for a good price, go for it and do the mod.

    Attached Files:

  2. two fingers

    two fingers Loud Mouth Know It All Blowhard Gold Supporting Member

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    Nice! I have one of those babies I rarely use for the very reasons you mentioned pre mod. Thanks for the info. When I get time (who knows when that will be) I'll have to give that a try.
  3. shoot-r

    shoot-r

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    Oh Dave of Avatar, This is a GREAT idea for those of us that don't want to transport a TB153!!!

    Maybe offer this mod as a option to the standard Foster horn.


    I'd like to try this mod with one of my Avatar Neo 210 cabinets just to see what it might do...
  4. Gradyoactive

    Gradyoactive

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    How many ohms is your SB112?

    I have a 4 ohm Delta cab that I want to try this mod on. The Eminence LA6-CBMR 6-1/2" has a 8 ohm impedance. What would the resulting impedance of the modified cab be? My amp head can handle down to 2 ohms, but I want to add another identical SB112 cab that I also want to mod. Are the two speakers connected in series or parallel?
  5. Blues Bass 2

    Blues Bass 2 Supporting Member

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    You can add the same high pass filter the OP used .
    http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-600

    Your impedance will stay close enough to the same . A two-way crossover would be a different story but with the high pass it will work . You can bypass the attenuator too like the OP did with his cab and it should sound OK .

    Here is a mod I did to a couple of my SB112s . I put waveguides in them and a Econowave crossover . We use these at practice for our vocals and they work awesome .

    [​IMG]
  6. mixamatchi

    mixamatchi

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    Just did a similar mod to a SWR cab. It's a great idea. The tweets are just not implemented well. Mine was hi-passed @ 5khz. The 15 was full range. End result was a big hole in the mids. Got a 2way crossover, and a 5" mid driver, and the cab sounds so much better.
  7. Gradyoactive

    Gradyoactive

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    I'm worried that the 150 watt midrange driver will get blown when I turn up the volume on the 500 watt SB112 cab. I want to be able to crank my amp to 250 watts at least. Should I just return these 150 watt speakers and look for more powerful replacements?
  8. Passinwind

    Passinwind Charlie Escher Supporting Member

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    What crossover frequency and what order filter will you be using?
  9. Gradyoactive

    Gradyoactive

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    I was going to use the same setup as the OP: Eminence LA6-CBMR 6-1/2" sealed back midrange speaker and an Eminence PXB:1K6 high pass crossover board, so 1600 Hz. I'm not sure what the order of the filter is.
  10. Passinwind

    Passinwind Charlie Escher Supporting Member

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    18dB/octave = 3rd order. There's not much inherent energy in typical bass signal that high to begin with, and then that fairly steep filter removes a ton more. A genuine 150 watt rating should be plenty.

    All of the common higher power replacement candidates I know of are open-backed (and only marginally rated higher), you would need a sub-chamber with them. I've never heard the sealed one, but a lot of people diss them pretty hard, and many others seem to like them just fine. ;)
  11. topcat2069

    topcat2069 Supporting Member

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    Disclosures:
    Endorsing Artist: GK Amps / non compensated Warmoth Guitar and Bass Parts
    I just asked Dave and he said "Nada" it's an owner mod..... that I'm willing to take on..:cool:

    $668.00 2 SB112 s shipped $170.00 for 2 Eminence LA6-CBMR 6-1/2" Sealed Back Mids & 2 Eminence PXB:1K6 High Pass Crossover Boards
    Total: $838.00 or $419.00 each... That's do-able
  12. Gradyoactive

    Gradyoactive

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    My new amp puts out 600 Watts. I don't plan on cranking it too close to the max, but I am kind of worried that if it somehow ends up clipping, it will blow my Eminence LA6-CBMR 6-1/2" speaker, if I bypass the attenuator like the OP did. Should I just buy a better attenuator, or will I be fine without one?
  13. fourstringbliss

    fourstringbliss Supporting Member

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    I'm thinking about replacing the tweeter on my 210 combo with a 3" speaker. Could I use the original crossover and just connect the tweeter wires to the 3"?
  14. MysticMichael

    MysticMichael Hip No Ties Supporting Member

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    Would this particular modification likely work just as well if one were to get the Avatar SB112 with the (unspecified) Neo woofer rather than the Delta LF ceramic woofer? Since we're talking about a simple high-pass filter, rather than a genuine two-way crossover?

    Would one need to change the high-pass frequency point in order to suit the (presumably) different high-midrange breakup point of the Neo vs. ceramic woofer?

    Any educated guesses? :meh:

    MM
  15. MysticMichael

    MysticMichael Hip No Ties Supporting Member

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    Bump for an answer to my question of three months ago. (Note that I didn't impatiently bump the thread within the first hour, with a demanding "So? Anyone?" :rolleyes: :smug:)

    MM
  16. bobcruz

    bobcruz

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    That could work (make sure to wire the new speaker the same way as the original tweeter, that is, polarity is reversed from the woofer due to the crossover's phase shifting of the signal). The problem is likely to be the low efficiency of most 3" speakers, down in the 87-91 dB range, compared to the woofer.

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