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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Room Resonance and Amp posted by Mikenificent1 on April 14, 2000 at 07:10:34:
For clarity's sake, if we look at the upper bass on up, then the room modes are an acoustical phenomena, which occure with a steady state input that extends beyond one cycle of excitation. This defines most common bass notes, as even decaying drum notes hang on in time long enough to excite modes.We hear the direct sound, and then hear the room modes build-up, and for most of the frequency range, we perceive the direct sound as the sound of the music/instrument. Trying to EQ one of the peaks will reduce the direct sound level, and the room mode still exists, and is just as strong as ever. Reduced excitation of the mode does result in less overall level using averaging and a sound level meter, but the direct sound is weaker, while the mode build-up is still there full strength. In essence, you have actually reduced the direct sound, and relative to that level, increased the room build-up level. In other words, the room modes will actually stick out more!
As could be surmised, the cancellation modes can not even be fudged like the peaks seem to be fixed, as no matter how much energy you pump into that frequency, it will still want to cancel. The direct sound will have a huge bump at that frequency, while the room mode cancellation will still tend to kill it steady state.
The same goes for diffraction dips, refelction dips/peaks, etc.
The best way to deal with room modes, refelctions, diffractions, is to absorb them, acoustically damp them, then not only is the SPL meter satisfied, so are your ears.
In the very deep bass, below about 100 hz, the difference between steady state and transient signals becomes blurred, and your ear is more forgiving in the time domain, so some judicious EQ can actually help some here, but you are essentially 'getting away with it', not bending the laws of physics.
DIY acoustic treatment of a room is not that expensive or that hard to do, see:
http://members.xoom.com/Jon_Risch/a1.htmJon Risch
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Follow Ups
- Re: Room Resonance and Amp - Jon Risch 19:04:16 04/14/00 (1)
- Re: Room Resonance and Amp - Mikenificent1 10:11:50 04/15/00 (0)
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