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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:
has to do with the subharmonics generated by RF frequencies.
Many current transistors are designed for digital products and such devices have a FR up to mega if not giga Hz range. RF can excite frequencies in those regions and while the human ear may not perceive those frequencies, the interactions of such frequencies will produce subharmonics which are the numerical differences of the involved frequencies. That is a 100 mega Hz oscillation and a 100 megahz plus 10 frequency will produce a subharmonic of 10 Hz.One solid state designer blames the fact that RF prone devices tend to be solid state (transistors)and blames that on the fact that tube gear has a generally 'warmer' sound. He informed me that his power supplies seem to draw more current than predicted, and inevitably, as his test instrumentation increases in sensitivity and in range, he finds more and more parasitic oscillation in the RF range. Eliminating them produces a significantly warmer sound, he reports (and I do hear it in his designs).
Remember any piece of wire is essentially an antenna. One meter was the standard length for the older car radio antennas, so that gives you an idea of what frequencies a 1 meter IC can pick up. Even circuit board traces can act as an antenna. The consider the amount of wireless devices in current use: cell phones, bluetooths, laptops, remotes. The amount of such devices is constantly growing, pervading our air waves with large amounts of microwave emissions. Your power grid itself is essentially a huge RF network and heaven forbid should your local utility be experimenting with sending computer data on the lines!
Stu
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- One theory - unclestu52 11:52:34 05/11/07 (0)
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