speaker excursion on run in tracks - diyAudio
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Old 16th July 2012, 08:13 AM   #1
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Default speaker excursion on run in tracks

I am using a pretty quiet Phono preamp (almost inaudible back ground noise with ear an inch from driver)
Technics 1200, pretty well set up
Playing new vinyl.
On the lead in tracks and on the "in between" tracks the cone moves dramatically!
No real sound but obviously a fair pulse of signal.
Why? And what can I do about it?
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Old 16th July 2012, 08:18 AM   #2
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AFAIK, the appropriate standards define a high pass filter to remove this sort of LF noise. However because this involves big capacitors in the signal line, audiophile "fashion" has been to remove this feature. You can either build a new phono pre with HP built in, or possibly modify yours with a few extra components, but we need to see a schematic to be sure.
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Old 16th July 2012, 09:19 AM   #3
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It used to be called a rumble filter, but of course no self-respecting audiophile will admit to having a turntable which rumbles! The simplest thing (defined by RIAA as an option on the curve?) is a 20Hz first order high pass filter. Nowadays people seem to want to hear sound which was probably never there on the LP anyway, but as a consequence they are forced to 'hear' things which are not meant to be there.
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