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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Speaker Placement help posted by mitch4t on February 25, 2003 at 09:07:27:
Hi, Mitch:Here is a room mode analysis of your listening room:
Height----------Width-------Length
25.0------------22.0--------70.00
22.6------------25.7--------8.07 baseline frequency
-------------- -------------- 16.14
22.6 -------------- --------------
-------------- 25.7--------24.21 double width-length mode
-------------- -------------- 32.29
-------------- -------------- 40.36
45.2 -------------- --------
------------ ----------- -------48.43
-------------- 51.4 --------------
------------ ----------- -------56.5
------------ ----------- -------64.6
67.8 -------------- --------------
------------ ----------- -------72.7
-------------- 77.0 --------------
------------ ----------- -------80.8
------------ ----------- -------88.9
90.4 -------------- --------------
------------ ----------- -------96.43
-------------- 102.7 --------------
------------ ----------- -------104.5
113.0------- ----------- -------112.6-------------- 128.4 --------------
Apart from the 25.7 - 24.2 Hz and 112.6 - 113 mode proximities, your room has a nice spread of bass modes. If you would like to activate a bass mode, place the speakers on an even fraction of the dimension associated with the mode. If you would like to minimize a bass mode, place the speakers on an odd fraction of the dimension associated with the mode (on a null). These are just starting points for tuning the overall room bass response, changes of fractions of an inch can produce dramatic differences, so patient trial and error is required. Seating position can also affect perceived bass response in a similar way, i.e. even fraction - odd fraction seating position with respect to the width and length.
Early reflection notch filter effects from the screeen will produce frequency anomalies by doubling some frequencies, and halving others in close proximity, also call a "comb filter" effect, due to the shape of the frequency response. This will impair spatialization and upper harmonic structure, in addition to producing an unnatural and cold tonality. A thick blanket or quilt will minimize these early relfections at frequencies determined by the coefficients of frequency absorption of the material used.
Hope this helps.
Best regards, rdb :-)
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Follow Ups
- Room Mode Analysis - RandyB 21:17:52 02/25/03 (0)
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