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Thread: Spatial stereo?

  1. #1
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    Spatial stereo?

    Anyone got a sound processing plugin that can apply that 80s style spatial stereo sound expansion when the speakers are a bit too close together?


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    Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0
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  2. #2
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    Guess not! Perhaps I should move my speakers a bit further apart...


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    Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0
    Music: ~1300 CDs, as 450 GB of 16/44k FLACs. No less than 3x 24/44k albums..

  3. #3
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    Quote Originally Posted by drmatt View Post
    Guess not! Perhaps I should move my speakers a bit further apart...


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    It’s complicated as you would need to fully decode the audio in LMS, apply the spacialiazer and the re-encode to an identical format
    LMS 7.7, 7.8 and 7.9 - 5xRadio, 3xBoom, 4xDuet, 1xTouch, 1 SB2. Sonos PLAY:3, PLAY:5, Marantz NR1603, JBL OnBeat, XBoxOne, XBMC, Foobar2000, ShairPortW, JRiver 21, 2xChromecast Audio, Chromecast v1 and v2, , Pi B3, B2, Pi B+, 2xPi A+, Odroid-C1, Odroid-C2, Cubie2, Yamaha WX-010, AppleTV 4, Airport Express, GGMM E5

  4. #4
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    Years ago there was the inguzDSP plugin but I don't think anybody posted about spatial more about room correction.

    Nowadays I'd expect the spatial or EQ stuff to be done in a player not in LMS and so would be on the audio side of a Squeezelite based Pi system.

  5. #5
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    Quote Originally Posted by drmatt View Post
    Anyone got a sound processing plugin that can apply that 80s style spatial stereo sound expansion when the speakers are a bit too close together?


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    Just pop a Boom on a stand and turn the XL up to max!!

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    ronnie

  6. #6
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    How about using SoX to transcode with a LADSPA plugin.
    There is one that is described like this:
    Matrix Spatialiser (matrixSpatialiser, 1422)
    A simple spatializer that lets you control the width of a stereo signal.
    We convert it into a MS (mid/side) signal, manipulate the gain coefficients with a constant-power panning function, and reconvert to left/right stereo.
    mid = (i_left + i_right) / 2
    side = (i_left - i_right) / 2
    width = (-pi/4)..0..(pi/4)
    o_left = mid * cos(width + pi/4) o_right = side * sin(width + pi/4)
    shifted by pi/4, so that 0 is neutral.
    Width
    0 is neutral (unmodified signal) + 128 is side only (=very wide) - 128 is mid only (=mono)

    http://plugin.org.uk/ladspa-swh/docs...ml#tth_sEc2.69
    Paul Webster
    http://dabdig.blogspot.com
    Author Radio France (FIP etc) plugin

  7. #7
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    Cunning plan..

    Though I was thinking of the spatial stereo encoding systems that used to use phase encoding to enhance the stereo beyond the speakers themselves.

    Is that what the Boom does? Knew I wanted one. Now I know why...


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  8. #8
    Senior Member toby10's Avatar
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    StereoXL better explained and experiences (post 7 and beyond)
    https://forums.slimdevices.com/showt...light=enhancer


    StereoXL explained (from SB Boom white paper)

    StereoXL Technology
    StereoXL™ is a proprietary stereo expansion technology developed by Logitech audio
    engineers. It provides a significantly enhanced stereo sound field, expanding the sound stage
    beyond the physical extents of the speakers themselves.

    I have always been wary of this type of processing for fear that it would wreck the audio quality
    in order to achieve the effect of stereo widening. However, once the engineers from the
    Logitech Audio business unit helped implement StereoXL in the Squeezebox Boom, the results
    were very surprising. The audio quality wasn’t diminished at all, but the sound seems to come
    from everywhere.

    That said it can be overdone, and the quality depends on the track used and the encoding used.
    In order to allow for varying user preferences, and track encodings there are 3 settings for
    StereoXL. The best one is typically in the middle (medium).

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