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In the Forum: Analog Playback
In the Thread: Eq for 78's
Post Subject: Re: Eq for 78'sPosted by Roberts on: 12/26/2005

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The big problem with 78RPM is their is not one EQ that functions properly with large cross sections of the discs. I have collected several curves for different periods which many are not interchangeable. I feel this database I have collected to be conclusive of years of research and is not for sale. One must do the research for themselves. Most of the "restoration work" I have heard lacked the ability to stay within the playback spectrum of the discs. The LF cut-off of the best playback mechanisms of the day were acoustic in nature, not filtered electronically. Same with the higher frequencies. A realistic 65 to 5500Hz range is displayed with the recordings, why roll the bottom end off to unrealistic proportions other than to comb out the lowest fq information which could be bothersome. (?) To consider one curve alone would be a fallacy, even with one disc. A combination of various curves are required.
This research is based on listening to authentic and actual playback mechanisms of the periods and not simply an extrapolation of what "sounds best".

A very convincing reproduction can be made. Not one that considers "audiophile qualities" but musical ones.

Noise filtering however has evolved significantly over the years with high speed processing as to not interfere with the frequency range but to deal with surface impulses and noise levels 10dB below the programme. Surface noise should be dealt with at the disc level, not via eq or filtering in the electronics. Impulse noises can be dealt with electronically with satisfactory results. 

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