Listing your equipment and a photo of the room would be very helpful. Also describe how you measured the speaker's frequency response.
How can I get rid of a 4khz-8khz room spike?
Using different speakers in various positions and measuring room response with a RS SPL meter, I get a consistant 10 db spike over the 4-8 khz range in my small 11x13 listening room. I have just installed a full complement of room tunes and now must decide on other acoustic treatments and/or tweaks to incorporate. I have yet to place anything other than a small loveseat and leather chair in the room, so the walls are barren. What would best attenuate this 4-8khz bump - wool tapestries, rigid fiberglass, diffusion panels, other???
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Are you sure it is the room? Perhaps some nearfield measurements will reveal that your speakers have a peak in their response. Ten dB is quite a bit and can be heavily influenced by your measuring technique. Is the meter clear of anything reflective including you that could be skewing the readings. If you hold it in your hand or lay it your chair then that can affect the accuracy. It's not that accurate in the first place. Assuming this data on the Radio Shack SPL meter is correct then take this in to account. A 10dB spike above the reading at 1Khz may be a problem but a 10dB spike in relation to lower frequencies may just be showing how inaccurate the meter is? |
Last year I consistently measured a treble frequency response spike in my system in the range of 5kHz to 6.3kHz. The treble frequency spike remained in the range of 5dB to 8dB (measured with the Radio Shack analog SPL meter with measurements adjusted to compensate for the inaccuracy of the meter) despite various room treatment experiments, component changes and cable changes. Throughout this period, the spike was most apparent when listening to string sections in orchestral music where the violins would exhibit a coloration that made them sound "hot" and forward. I was convinced that my problem was inherent in the treble response of my speakers until about six months ago when I was surprised to discover that the problem was primarily an issue with my AC electric. Apparently, there was high frequency noise riding along on my AC electric lines. I managed to solve the problem and revert the treble frequency response to flat with the upgrade of my AC electric system, including the addition of a 7.5 kVA isolation transformer. If you find that your problem is not inherent in your speakers and is also not related to room reflections, you might find that your AC electric supply is the culprit. If you are interested in more detail, check my virtual system thread. Good luck. |
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