Lowrider, I have a great many of the Telarc LP's from the 1980's, and yes, many of them are excellent. A few suffer from excessively swimmy acoustics, but that is clearly attributable to the mic techniques that were used on those particular recordings.
Concerning mastering, the following appears in the album notes in many cases:
Regards,
-- Al
Concerning mastering, the following appears in the album notes in many cases:
During the recording of the digital masters and the subsequent transfer to disc, the audio chain was entirely transformerless. Neither was the signal passed through any processing devices (i.e., compressors, limiters, equalizers, etc.) at any step during production of the finished product.Another factor which I suspect contributed to their good sonics was that although that was obviously prior to the advent of hi res digital recording as we know it today, the Soundstream digital recorder they used provided a sample rate of 50 kHz, in contrast to the 44.1 kHz rate of the CD format. That difference is, at least potentially, more significant than it may seem based on the numbers. The Nyquist-Shannon Sampling Theorem defines the maximum signal frequency that can theoretically (but definitely not practically!) be perfectly recreated from samples taken at a given rate. Per that theory, 50 kHz can, under certain idealized and unattainable conditions, allow perfect recovery of signal frequencies up to 25 kHz, while the corresponding figure for redbook CD is 22.05 kHz. So the margin between those numbers (beyond which all signal frequencies must be filtered out before reaching the A/D converter, to prevent "aliasing") and the 20 kHz presumed upper limit of our hearing is nearly 2.5 times as great (25% vs. just over 10%) for the 50 kHz rate as for 44.1 kHz.
Regards,
-- Al