Omni Tallboy 210 ?

Discussion in 'Amps [BG]' started by sifi2112, Apr 11, 2014.


  1. sifi2112

    sifi2112

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    So here's my problem ... I 'farted-out' my cab (PJB 9B 8 Ohms) playing low A on my Dingwall 5 string through one channel of my Yamaha P2500S power amp which putts out 275w @ 8 Ohms, now maybe I was expecting too much but I was a little surprised & disappointed as I didn't think I was playing 'that' loud. The Phil Jones cab is equivalent to a single 15" but adding another is not an option ... so here's my question,

    Would an Omni Tallboy 12 be able to handle low A ? My Yamaha amp will bridge 650w odd watts at 8 Ohms (can't do 4 Ohms) so I was thinking more along the lines of two BP102 (these also come in 4 Ohm versions) as you mention these as an option on your site as an alternative to a single 2512. I am also thinking of just having a mid range driver as I use a Darkglass B3K distortion pedal a lot of the time & not sure how that will work with a tweeter, I'm hoping the mid driver might cover most of the top end. Please let me know what you think or would advise & if there are plans for a tweeterless TB210 :)

    Thanks guys

    Simon
     
  2. BassmanPaul

    BassmanPaul Gold Supporting Member

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    What is the nominal power handling of the PJB cabinet?? You just might have too little power to drive the cabinet that low.

    For a couple of years I played with a guitar player who liked to tune a semitone down so B flat. My Acme B2 cabinets handled that without a complaint. I have full confidence that they would do the same at A.
     
  3. sifi2112

    sifi2112

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    Don't think it was too little power, maybe trying to play a note lower than the cab's tuned for. I've read that it's really the first harmonic that cabs usually reproduce ... as much as I like the PJB cab I can't afford another cab so would rather build my own ... if it's a good option.

    The only other 8 Ohm cab I've looked at is a GK Neo-II 212 but it would have to be 2nd hand & still not sure how it will handle low A .

    Anyone built an tweeterless Omni ? Any opinions / pics ?

    Bill,

    Do you have any objection to just go with 210 / mid ?

    If not, please let me know what I need to state in paypal etc to order plans ... :)
     
  4. Downunderwonder

    Downunderwonder

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    Ask BFM on his forum. He left TB some time ago.

    The first thing you need is a HPF to take away the fundamental nonsense. I don't know that even BFM's massive horn subs do A# fundamental.
     
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  6. yodedude2

    yodedude2 Supporting Member

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    the way i read the pjb manual, http://www.philjonespuresound.com/products/?id=97 the 9b is an 8 ohm cabinet that should be good for about 900 watts. before you go with another cabinet, you may wish to try a high pass filter and run your current amp bridged (8 ohms).
     
  7. BassmanPaul

    BassmanPaul Gold Supporting Member

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    This is what I was alluding to. If your amplifier cannot supply the cabinet the power that it needs the amp will clip and sound bad.
     
  8. sifi2112

    sifi2112

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    At what frequency should a HPF be set at ? Double low A ? 55Hz ? My Yamaha P2500s has this option but not sure of the roll off ...
     
  9. sifi2112

    sifi2112

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    I'll also rewire a speakon cable to run in bridged mode to see if the extra headroom helps along with different HPF settings .... maybe it's not my cab but I still shouldn't expect too much from a single 15" type cab or should I ?
     
  10. yodedude2

    yodedude2 Supporting Member

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    experiment. start there and roll it down slowly. use your ears. i would suggest not going below 35 hz.
     
  11. lelandcrooks

    lelandcrooks

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    It won't horn load that low, but it does play that low.
     

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