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Subwoofer equalisation using foobar2k's "Convolver" plugin

Discussion in 'Desktop & Laptop Computers Forum' started by MuFu, Nov 12, 2003.

  1. MuFu

    MuFu
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    This is neat! It's a software DSP that analyses a short, "impulse" response and from that can derive pretty much any combination of EQ, reverb etc and implement it in foobar's audio pipeline. The idea is that you take a reference impulse file (usually a white noise "blip") and apply your own effects to it - Convolver identifies these and applies them to whatever foobar is playing at the time.

    I've been messing around with it for a couple of hours this evening, using Cool Edit's parametric equaliser to process the impulse file.

    [​IMG]

    The blue plot is the native room response and the purple plot is with the DSP active. The difference in terms of real-world listening is remarkable. You can see I had an absolutely huge peak at ~64Hz which created that uncomfortable "pressure-in-the-ears feeling" on certain tracks (like sitting in the back of a car going at 80mph with just the front windows open, lol). Not perfect but it's a start and I'm sure I can get things +/-3dB without much more effort.

    A nice free upgrade for 2 channel HTPC output. :)

    MuFu.

    P.S. I think there's something similar available for Winamp as well.
     
  2. Jeff

    Jeff
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    That looks really good, how does it sound?
     
  3. MuFu

    MuFu
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    Cheers Jeff. Sounds good, yeah - like I said, there was a typically peaky in-room response before which has been sorted now. First impression is "where's the bass gone?!" but it's still there of course, just without the mid-bass bloom. Calibration's a little off now (was 85dB originally) but I can always sort that out later on.

    I wonder how long it'll be be before one of the open source projects produces something similar that can handle multiple audio streams. A software layer that sits between the driver and Theatertek, PowerDVD etc, applying realtime equalisation (possibly self-calibrating) would be awesome. I doubt soundcard IHV's will ever incorporate such a feature into their drivers - there just isn't the demand.

    MuFu.
     
  4. GRees

    GRees
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    Prompted by this thread I did a bit of searching on AVSForums and found THIS

    Sounds interesting.
     
  5. MuFu

    MuFu
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    Thanks. Lots of stuff there to digest! As usual the AVS guys are a huge step ahead. :D

    Seems there might be a multichannel solution that can automatically generate a filter to correct a room's impulse response on the horizon. Tantalising.

    [Edit] Just finished reading all 17 pages - Jones_Rush's results using acoustical treatment + DRC are astonshing. I mean... WOW. :eek:

    MuFu.
     

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