Anthem AVM20/30/D1 - application of notch filter

Discussion in 'AV Receivers' started by Jason GT, Nov 14, 2004.

  1. Jason GT

    Jason GT Second Unit

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    This isn't getting much in the way of response over at AVS. Perhaps I should have started at the "home" of the AVM. I'm trying to get my AVM dialed in ... how do I apply the notch filter?

    I have the room resonance filter turned on and centered at 39 hz. No matter what settings I use for filter width and depth, I don't get a corresponding drop in FR when using the AVM internal test tones.

    For reference, these are my FR readings from the main listening position, with no EQ applied. I have used a RS analogue SPL meter and already applied the relevant low-frequency corrections:

    FREQ (Hz) - SPL (dB)
    18 --- 80.0
    20 --- 84.5
    25 --- 86.0
    28 --- 86.5
    36 --- 90.5
    40 --- 91.5
    45 --- 90.0
    50 --- 79.3
    56 --- 80.5
    63 --- 89.5
    71 --- 87.5
    80 --- 84.5
    89 --- 84.0
    100 -- 84.0
    111 -- 81.0
    125 -- 78.5
    142.5 73.0
    160 -- 64.5

    (it actually appears that I have a pretty flat room [​IMG] )

    I'm trying to use the notch filter to smooth out the slight hump that I have between about 33 Hz and 45 Hz.

    Tips/hints etc would be appreciated.
    Thanks in advance!
     
  2. Lewis Besze

    Lewis Besze Producer

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    Yep you're very lucky indeed. I have a huge 15db bump at the same region which is very common BTW.
    Your current curve is actually looks like a "house curve" which many preffers over "ruler flat".
    PersonallyI wouldn't touch it, but if you must I would center it around 40 hz with a 20/60[one third octave]and drop about 3-4db.I don't know why you don't see any results though.Perhaps the internal tones at fault? Use extrnal tones if you can.
     

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