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Thread: 120 HZ crossover?

  1. #21
    Join Date
    Feb 2013
    Posts
    191

    Default Re: 120 HZ crossover?

    Interesting to follow your progress. I still need to do fine tuning of sub integration myself. I'm approaching mine using the receiver distance setting for the phase adjustment while keeping the knob on my F8 sub at 0 degrees. If I had your results, I'd expect to go with 0 degrees delay (or try other intermediate values) and reduce the sub level 3-5 db. Then expect Audyessy to handle the 150-200 irregularities. Ideally, you'd include the response a bit below the crossover point as well, say from 60 Hz. I'm looking forward to others' comments.

  2. #22
    Join Date
    Aug 2003
    Location
    USA
    Posts
    5,538

    Default Re: 120 HZ crossover?

    Quote Originally Posted by kinggimp82 View Post
    I took the measurements again with the speakers full range no sub and Audyssey off. Here is the results.

    8 inches from the wall
    80hz - 70.5
    90hz - 71.5
    100hz - 75
    120hz - 68.5
    150hz - 57.5
    200hz - 76.5

    16 inches from the wall
    80hz - 67.5
    90hz - 67.5
    100hz - 72
    120hz - 66.5
    150hz - 64.5
    200hz - 75.5

    I thought the measurements with the speaker 16 inches from the wall looked the most even so I decided to try measurements with the sub on with Audyssey still off and crossover set to 80hz. I took one set of measurements with the phase at 0. Then I took a second set of measurements with the phase at 180.

    16 inches from the wall phase 0
    80hz - 75.5
    90hz - 73.5
    100hz - 74
    120hz - 66.5
    150hz - 65.5
    200hz - 77.5

    16 inches from the wall phase 180
    80hz - 70.5
    90hz - 69.5
    100hz - 71
    120hz - 70.5
    150hz - 65.5
    200hz - 76.5
    Measurements look great for an in-room response. +/- 5dB is very impressive without using any EQ. Now I recommend running Audyssey with the proper microphone placement for each measurement. This should help with some of the mild cancellation you are getting between the response of the speaker and the sub. Being that the sub and speakers do not occupy the same space, achieving perfect phase integration between the two at all overlapping frequencies is not possible without DSP correction.
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    Good Sound To You!

    David Fabrikant
    www.ascendacoustics.com

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