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Clickrepair review4/19/2023 ![]() In the end the whole LP system is, and was, a (good IMO) set of compromises to produce relatively inexpensive copies of music recordings for the mass audience. I am not sure what type of sample would cast more light on the situation than we have now. There will be differences I know the reason for and others I don't, such as the accuracy of the RIAA in your analogue phono stage and any difference in loading effects of the cartridge. And then bunch of curves for 78 RPMs which are irrelevant for my use-case. Or maybe it's under a different name? Besides RIAA there are: ffrr LP, EMI LP, NAB, CCR. I looked at the pre-set curves in ClickRepair equalizer sofrware and didn't find 1976 RIAA curve. So I was looking to see if it were possible to use analog RIAA with frequency shift - it would save me an extra step to apply RIAA digitally. Another thing is that post processing after the recording is rather a lengthy process. At the end if it is possible to fix HF and bass in equalization, that would be great, if not, I can live with that. ![]() Another plus is that if the record is worn out, then about 80% of pops and crackles are gone. However, the pluses are that most of IGD are completely gone (with exceptions if it is just part of recording). So for slow-speed method there's a tradeoff: slightly exaggerated bass, slightly less HF and more noise which is a bit audible during quiet parts. If the record is recorded with normal/quiet volume, I use the traditional method digitizing it using analog RIAA phono stage at normal speed. The whole point of using slow speed method recording is to get rid of IGD (inner groove distortions)/mistracking which sometimes appear towards the center on the records that are pressed/recorded with louder volume. I am Frank, not Scott PMFJI but record players was my job almost 50 year ago now and the physics of how cartridges work hasn't changed. This is just a fact of the physics of a record player you are stuck with I'm afraid. If the arm/cartridge resonance is at 10Hz, say, and the filter is at 20Hz to remove the resonant region, that will limit the accurate transcription of bass to a lowest of 40Hz if you play back at 16 ⅔ and correct pitch in software. Playing back at the intended speed and making sure the phono stage has at least the RIAA recommended high pass filter (I favour a stronger one) is the way to get the most accurate bass from a record, though some people like the "loadsa bass" effect they get from the resonance and come up with all sorts of reasons why a high pass filter sounds worse when it is actually simply removing non-music related boom! ![]() It can not be corrected afterwards because it is a physical effect which depends on the laws of physics, using this type of transducer is inherent to record players and its limitations are baked into the system. It will sound bassier because you are listening to more of the cartridge body bouncing on its suspension - not because you are more accurately transcribing the bass from the groove. Not my personal idea of a good trade, given the strengths and weakness of LPs and record players.Ĭlick to expand.I am Frank, not Scott PMFJI but record players was my job almost 50 year ago now and the physics of how cartridges work hasn't changed. In short recording the output of a slow record and changing the pitch later may improve the HF of the recording but will significantly lose bass and/or bass accuracy, depending whether you properly filter the signal or not. That is fixed by the physics, so if you run the record slowly the lowest accurately picked up frequency when you correct the pitch will go up in proportion to the difference in speed. Simply put most of the output from the cartridge below that frequency is due to the mass of the cartridge bouncing on the suspension spring and as it approaches 2x the natural frequency the mass becomes quasi-stationary so subsequent output is due to stylus movement - ie it starts measuring the groove fairly accurately. ![]() The output from a seismic type transducer ( which is what a pickup cartridge is) is inaccurate up to around 2x the natural frequency of the effective mass on the suspension compliance.
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