Placement of subwoofer in comparison to left main.

Discussion in 'Archived Threads 2001-2004' started by John Fishburn, Feb 2, 2002.

  1. John Fishburn

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    Will there be any acoustical problems with my subwoofer about 6 inches behind my left main? I have it set this way with the subwoofer in the corner and was just wondering if this is somthing i shouldn't do.
     
  2. Kevin C Brown

    Kevin C Brown Producer

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    What's more important, is once you have a spot that you think is OK for your sub, is to properly adjust the phase of your sub with respect to your 2 front speakers.

    You can do this with Avia, or with a discrete tone test CD and an SPL meter.

    Because of the crossover in your receiver/pre-pro, and even the crossovers in your mains, there no way you just place a sub and not worry about the phase.

    *Any* kind of filter, whether it be a crossover, low pass or high pass filter, or even an external EQ, can subtle change the phase between your mains and sub.
     
  3. Rick Radford

    Rick Radford Supporting Actor

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  4. John Fishburn

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    My sub only has 0 and 180 phase also. But I have ran a test with the sound and vision dvd and it sounds in phase to me.

    THanks
     
  5. Kevin C Brown

    Kevin C Brown Producer

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    John- Be careful: [​IMG]
    When I tried to adjust the phase by "listening", (I used Avia), I was completely off.
    I got it right only by using a discrete tone test disc, and measuring the response below, through, and above the crossover point with an SPL meter. (Sub+mains output must be higher than that of the sub by itself, and the mains by themselves.)
    (Basically, by ear, with the correct phase, I felt the bass was too "boomy." So I adjusted to an "off-phase" value. I didn't get the "boominess" taken care of until I got an eq to tame the low freq/room induced peaks I had.)
    Rick- Yuppers! That's what motiovated me... [​IMG]
     

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