You oversee the production of the vinyl editions for Berliner Philharmoniker Recordings. What steps do you follow once you receive the recordings from us?
Once I’ve received the recordings, I begin by importing them into my digital audio workstation. There I gain an overview of the running times, number and sequence of pieces, dynamics, intensity, instrumentation/arrangement and the overall sonic aesthetic. I then try to assess which passages or tracks might be particularly challenging, as with the vinyl record – an analogue medium – specific considerations must be taken into account.
If the programme is cut too quietly, groove noise such as surface noise or crackles becomes more prominent, compromising what’s known as the signal-to-noise ratio. However, some instruments tend to produce troublesome distortion on vinyl even at moderate levels. This includes brass instruments. For the Christmas record Frohe Weihnachten!, it was crucial to find the ‘sweet spot’, so that the musical signal stood out clearly from the surface noise, whilst remaining moderate enough that listening pleasure wasn’t diminished by distortion.
Once I have an idea of how the transfer can be realised technically and sonically, a test cutting on lacquer follows. Lacquer discs can be played back just like an ordinary vinyl record, so I can directly assess how the result will sound later on. During this process, I cut the grooves of the selected passages at precisely the position on the disc where they’ll ultimately appear.
If the test cutting sounds as I’d imagined, I then cut the vinyl master for industrial production. If, however, I discover that something doesn’t sound as intended or problems arise, I analyse the cause and adjust the transfer parameters accordingly. But with acoustic music, there are usually no nasty surprises.
This master must not be played back again, because unlike the test cutting, one cannot accept any wear on the master. Instead, I inspect it optically under the microscope to ensure the grooves are the correct depth, that they’re cleanly cut, that they don’t intersect one another, and so forth.
If everything looks flawless, I carefully package the lacquer discs and send them to the pressing plant as quickly as possible. Swift processing is crucial for the quality of the product, as lacquer discs are sensitive to both time and temperature. After cutting, the lacquer’s surface tension changes, which can cause the groove shapes to alter minimally once more. To prevent this, the disc must be transported and stored at a low temperature. At the pressing plant, a metal master is produced through electroplating – only then is the malleable form made stable and durable.