WARNING
NOT FOR THE FAINT HEARTED!!
I've done about 1200 12" transfers to digital over the past few years (I tend to have spurts of activity, then get really fed up with it) and have a few tips for anyone willing to risk the outcome.
Rumble, Crackle and pop is a particular problem, especially in the intros of tracks where the density of the sound may not be as bludgeoning as later on. I tried soooo many different techniques to help with this and two actually work. Apart from having as good a copy as possible (even mint copies can have terrible noise, so even this isn't a guarantee), try the following.
Firstly, place a little liquid soap onto the record, add a little water and lather. What you need to end up with is a fairly thick consistency of bubbles (you'll soon get the hang), that'll last for a few minutes. As soon as you have the lather all over the 12", transfer to digital ASAP, before the lather dries out too much.
(2) If this doesn't work, (this is where real alchemy takes over).......have a drink and place as much saliva as possible onto the affected parts of the 12". This may sound a tad gross, BUT it really can work. Just don't do it after you've had something to eat, as you'll end up with food particles on the record. Once again, transfer ASAP to digital, before the saliva dries up. After doing this, make sure you give the record a good wash.
Neither will fully remove crackles and pops, BUT it is amazing how much cleaner, soundwise, the records actually can sound. I don't know how or why this should work, but it does....(probably something to do with the catilever of the stylus having its travel limited and static being fully discharged).
Apart from that, I have a single ended noise reduction unit (...actually I have a rather expensive piece of kit, a TC Finalizer that I have programmed to emulate single ended noise reduction) that helps with rumble, hiss and low level crackle/groove noise. If bad crackles and pops still exist, I will do some noise removal via Audacity, but I find this rather tedious. Forget the noise reduction and click removal add ons in Audacity, in my experience, THEY ARE ABSOLUTELY USELESS!!!
Secondly, if you can, put the record deck through a mixer of some decription that allows you to E.Q. the tracks. Virtually every record can do with some E.Q. tweaks to beef up the bass end (at around 50-80 Hz) and add some sparkle to the top end (above 12.5 KHz). Since doing this, my transfers sound sooo much sweeter (but still relatively flat). WARNING: When adding E.Q. DO NOT overdo it, otherwise you might end up destroying your speakers. Most records are relatively flat from 90 Hz up to 10 KHz, maybe 12.5 KHz, so a little boost at the audio extremities is all that's required.
I ain't saying I end up with perfect tranfers, BUT they sound sweet enough, some slightly nicer (to my ears) than the same tracks I have on commercial CD.
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