Help with SUB response

Discussion in 'Speakers' started by Massimo N, Feb 1, 2005.

  1. Massimo N

    Massimo N Stunt Coordinator

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    I'm trying to decide if I should spend the time to EQ my sub and I would like some feedback.

    My sub is the SVS PB12-Ultra-2 with 1 port blocked (20hz)and located in the front corner in a small sealed room (approx 12.5'(w) x 18'(l) x 7.5' (h). The room is in my basement.

    I have 2 Parametric EQs currently at my disposal ... one in my Pre/Pro (Anthem AVM30) and one in the sub's amp.

    I think I'am getting a fairly a fairly decent response but I'll leave that to the experts. I don't know what type of house curve I should have, but un-eq'ed I'm getting a nice rise in the lower octaves.

    Here are the numbers:
    FQ--Measured-Adjusted
    15-----76-----87.5
    17.5---83-----91.0
    20-----88-----95.5
    22-----90-----96.5
    25-----90-----95.0
    28-----93-----97.0
    31.5---88-----91.0
    36-----84-----86.5
    40-----86-----88.5
    45-----87-----89.0
    50-----83-----84.5
    56-----85-----86.5
    63-----86-----87.5
    71-----79-----80.5
    80-----78-----79.5

    Any help how to maximize my EQs (only 2 available) would help. I would like to avoid buying a separate EQ if at all possible.


    Massimo
     
  2. John S

    John S Producer

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    Did you take these measurments at 1 meter? It does look like an eq may be able to work near wonders if so. Sub eq's are best for subs, they allow way more precise adjustments in the sub frequncies. Most non sub eq's just don't allow the precise control needed to work wonders.

    Interesting numbers though for sure, quite respectable in my opinion as is.
     
  3. WayneO

    WayneO Supporting Actor

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    Yeah, looks nice. Since you have them available, maybe a 2dB cut around 28 and 45hz to smooth it out even more.
     
  4. Massimo N

    Massimo N Stunt Coordinator

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    Thanx for the response guys.

    These measurements were taken from the prime listening position ... approx 12' away from the sub.
     
  5. John S

    John S Producer

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    Hmmm, In that case, I actually think you could do even more with room placement than with the EQ. Where are you corssing over to your mains? Maybe cros them a little higher, could just be some simple cancellation going on.

    But as I said, I'll bet it's real good, those are totally respectable numbers that many people cannot really achieve because of problems in their room / environment.
     
  6. Massimo N

    Massimo N Stunt Coordinator

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    I have my crossover set at 80 for all speakers. I have the ability to assign different crossovers for each speaker, but I've just stuck with 80 for now. My mains are Paradim Studio 60 v.3 and Surrounds are Studio 20 v.3.

    Given the sub is a little heavy (approx 190lbs) it's not that easy to move around to experiment with different placement options.

    It's now in the front of the room. I can't move it towards the front center, as it'll interfere with the screen. I do have room in the back (anywhere along the wall). Do you think I'd get a better resonse with a rear center placement?

    The sub definitely has some output, but there's always room for improvement.
     
  7. John S

    John S Producer

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    It is pretty good now. I know people with more challenging rooms, that would probably give up and arm to get the numbers your getting right now by the way. [​IMG]
     

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