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Bose 901 EQ distortion
Richard Crowley wrote:
"GregS" wrote... "Richard Crowley" wrote: Is the curve of the Bose EQ box published anywhere? I think I saw it on the patent. Anyway, its flat from 100 to about 2 kHz. There is up to an 18 dB peak at 30 Hz, and a 12 dB peak at 12 kHz. Essentially, most everything is lost above 12 kHz. Studio sound mentioned 22 dB of eq, which lead to it being impossible for Hugh Ford to measure on the eq version they tested because 1 volt input at 20 kHz caused clipping. I can't get into detail, the paper the print was on has been recycled long time ago. That would make a bullhorn or a telephone sound good! :-) We have to take this in stages, first we teach him what a good EQ is, next he begins to wonder - like everybody else - about the wisdom of using midrange units for full range audio. It is no good to just flame the boseaholics, they need to be taught. It is of course cheaper to just replace the loudspeakers without getting another eq or getting the broken one fixed, except that Bose reportedly will take a look on the actual eq box and fix it if broken. In the real life, outside the world of the brochures, many loudspeaker-room combinations will benefit from eq, but as a general guideline something is broken or ill applied if more than 6 dB boost is relevant, narrow 8 db cuts may be very relevant in the low range in rooms that have no low range acoustics regulation, ie. bass traps. Kind regards Peter Larsen |
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