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BFD & Dual Subs

Discussion in 'Subwoofers' started by Jase, Nov 1, 2003.

  1. Jase

    Jase
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    Hi Guys

    How are the owners of the BFD and Dual Subs going about their equalising? Are you doing each sub in turn or both at the same time?

    Ta!:)
     
  2. GaryG

    GaryG
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    Hi Jase

    I did mine seperately to start with then the two together and did a final check with the front mains as well. I used a couple of x30 controllers to match the phase with the fronts as best as I could.
     
  3. Jase

    Jase
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    Hi Gary

    Did you use each channel of the BFD for each sub and then combine the two together or did you create three/four seperate settings?
     
  4. GaryG

    GaryG
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    Yes, I used a seperate channel for each sub and calibrated individually. I tend to use a pc to do the calibration using a tone generator. I start off at 20hz and increment by 1 hz through to around 100hz and make a quick note of where the peaks and troughs are. I then do a second sweep and go to the first peak or dip and adjust the BFD filter to iron out the peak/dip as best as I can (noting that if it's a true null at the listening position I leave it and move on). I then move on to the next peak/dip and repeat the procedure. I find that much quicker than plotting graphs. I also don't bother compensating for the RS meter because I like a slight boost at the low end.
     
  5. Jase

    Jase
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    Thanks Gary.

    I was going to use Digital Video Essentials and it's 15hz upwards sweeps to keep the signal Dolby Digital (also got AVIA as well). Initially I'm going to see what sort of response I'm getting use 5hz increments, 15hz, 20hz etc etc, with both subs running then I'll try them individually. Only drawback is it's a sweep and not seperate tones so I'll have to be quick to make a note of the readings! LOL

    Haven't purchased the BFD as yet but hope to in the next couple of weeks.
     
  6. GaryG

    GaryG
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    Looks like you're going to have some fun using a sweeping tone!:D
     
  7. Jase

    Jase
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    Yep! Just found that out!:D Ran a few sweeps and it doesn't look too bad (just watching what the sound meter does). I'll have to spend some time on it tomorrow. :)
     
  8. Andywilliams

    Andywilliams
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    Hi Jase
    Have you took delivery of your svs subs yet.
    Cheers Gonzo.:)
     
  9. Jase

    Jase
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    Sure have! :D. Had them for just under a week now but have been tinkering with settings/phase etc to get them right. Got them setup quite well initially and they were sounding great, then I got playing about and buggered the sound up :rolleyes:. Been fine tuning them again over the last couple of days and I'm quite impressed now. The Hulk was interesting to say the least.:smashin:
     
  10. Jase

    Jase
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    Here's the results of the sweeps I did. Blue is normal, Pink is with THX Ultra2 Boundary Gain Compensation switched on. Only did the sweeps up to 100hz. Crossover on the amp is Fixed THX (80hz). System is balanced to 80db with Digital Video Essentials using the 40-80hz Test Tone (DVE's LFE is recorded 5db too hot by the way if you're wondering) then knocked back 2db to allow for the sound meter inaccuracy at that range.
     
  11. GaryG

    GaryG
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    Very impressive! So are you using them with or without the THX compensation?
     
  12. Jase

    Jase
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    At the moment I keep switching back and forth between the two! LOL

    With THX compensation I can have the overall volume higher and it sounds great, nice tight thuds etc. With it off I don't need the volume much higher than -20db to get plenty of impact. With THX on it sounds more controlled (to my ears anyway).

    Quick note: The measurements are the compensated SPL figures rather than the actual SPL readings.
     
  13. Smurfin

    Smurfin
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    Looks good, although I'd add a little gain in the 56-63hz region.
     
  14. Jase

    Jase
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    Can't, as I haven't got a BFD (as yet!).:D
     
  15. Smurfin

    Smurfin
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    doh! sorry only skim read the thread:rolleyes:
     
  16. Steve Bate

    Steve Bate
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    Bloody hell Jase :eek: :eek: :eek: Thats virtually flat without a BFD what on earth do you want one for?

    Steve
     
  17. stevegreen

    stevegreen
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    This is Jase we are talking about Steve :rolleyes: :D

    I hear that he is soon to be hacking his room to bits with a big chainsaw to help eliminate some peaks that he thinks he might have :rotfl:
     
  18. Jase

    Jase
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    I was wondering the same thing last night Steve.:D Mind you, with a BFD I could get it really flat! :cool:
     
  19. Andywilliams

    Andywilliams
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    Hi Jase
    Come on then whats your opinion of the svs subs:D
    are they what you expected good or bad?
    Cheers Gonzo.:)
     
  20. Jase

    Jase
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    Excellent, now that I've had them for a week or so and spent time tweaking them. I could easily manage with just one of them but two adds that extra bit of fun into the mix.:D
     
  21. lmccauley

    lmccauley
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    Jase could hack his room to bits with a stanley knife... ;)
     
  22. Jase

    Jase
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    :D More fun if it's a power tool though.:D
     
  23. lmccauley

    lmccauley
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    Keep those two SVS going and it'll probably fall apart on its own...
     

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