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  1. #1

    Member Sales Rating: (7)

    Join Date
    Aug 2004
    Central Illinois

    Default PEQ or leave it.

    I was checking out the room response for my new 25-31cs+ and came up with the following chart. (all values are corrected) Since I am using my setup for 90% HT I currently have it set for the 20hz Tune.

    The volume levels represented are average peak listening volumes. (nowhere near max level) my question is, would it be worth it to invest in a PEQ?

    The 40hz dip is fine at 39hz, then drops off the deep end at 40hz. It then climbs back up and is back to normal by 45hz. (I was using a spread sheet with only certain frequencies (I only had the correction values for the frequencies it used) so I was kind of limited in my testing).

    The other peaks and dips are more gradual. Where would you recommend cutting the peaks with a PEQ and would you recommend adding to fill in the dips?

    looking at the Berringer Feedback Destroyer (unless you can recommend a better value for me).


    Attached Images  
    Mains.............Polk LSi15 (Cherry)
    Center............Polk LSiC (Crossover upgraded)
    Surrounds.......Polk LSi7 (Gloss Black - wood sides removed and crossovers upgraded)
    Subwoofers.....SVS 25-31 CS+ and PC+ (both 20hz tune)
    Pre\Pro...........NAD T163 (Modded with LM4562 opamps)
    Amplifier.........Cinepro 3k6 (6-channel, 500wpc@4ohms)

  2. #2

    Member Sales Rating: (1)

    Join Date
    Mar 2003


    A PEQ would help but not with the nulls. To fix those you can move the sub, build bass traps, or adjust the phase.

    Try moving it around and remeasuring the response at the listening position. Find the best place and if you still have nulls, either leave it or build traps.

    The BFD is the cheapest way to flatten peaks and I think it is a good value. I am constantly trying out new filters trying to get the most out of my sub.

  3. #3
    Member Sales Rating: (0)

    Join Date
    Apr 2002


    Whoa! That's a pretty serious dip. Before spending more coin on an EQ, you might try relocating the sub a few times and see what kind of results you get. Room modes, nulls, standing waves causing cancellation, etc, etc. could be causing the dip. Have you looked into building a Hemholtz resonator or bass traps? Do a Google search for both and you'll find lots of info.
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  4. #4

    Member Sales Rating: (1)

    Join Date
    Mar 2002
    West Des Moines, IA


    I agree with what has been said here already. I would try adjusting the phase on the subwoofer first to see how that affects things in its current location. After that, try different placement positions if you can.

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