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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: Why would R-C filters improve bass? posted by cporada@cabnr.unr.edu on May 8, 2007 at 12:33:43:
My understanding is that RF noise mixes with the audio signal inside equipment and produces spurious audio tones as a result. The higher frequency tones are immediately noticeable as excessive sibilance and mushy cymbals.The midrange becomes dry and disconnected in the presence of RF noise, leading to a sense of coldness and lack of emotional involvement in the music.
The bass becomes muddy and vague. The best way to tell this is to listen for the sound-stage precision of acoustic bass instruments in good recordings. When RF noise is reduced, they become more palpable and their placement is more clearly defined.
Keep in mind the effect you are hearing may be due to RF noise being coupled back into the main system from the power supplies to the subs, rather than a direct effect on the sub output. All the equipment shares the same AC supply if you trace the wires back far enough. Any piece of equipment, or any non-audio appliance, can generate RF noise that will stimulate resonances on the AC wiring as well as on audio cables.
You can identify the strong RF noise sources outside your audio system by turning off and unplugging the suspects one at a time. If you hear improved sound with the candidate source unplugged, then an in-line filter to that source may give you better sound if it is inconvenient to disconnect it each time you wish to listen. An R-C filter at that point of the AC power wiring may also help.
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Follow Ups
- Reducing RF noise improves the whole audible spectrum. - Al Sekela 14:35:02 05/08/07 (1)
- Re: Reducing RF noise improves the whole audible spectrum. - pkell44 12:24:42 05/12/07 (0)
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