Brian, commenting on a highly technical point with an "in my opinion", isn't really helpful. It's a basic element in digital sampling technology that as long as there are at least two samples available, the analog waveform is reproduced precisely. Around 20KHz only two samples may in fact be available, but the mathematics are such that these two samples can represent only one possible frequency. If there are instead about two thousand samples(low bass)instead of two, the precision is no different. A crude "connect-the-dots" type of process, which some imagine, has nothing to do with reality.
Nothing is "taken out"; after re-conversion the original analog waveform has been reproduced with an accuracy that an obsolescent format such as the LP can't match. It can be noted that digital sampling is also used in military, industrial and scientific realms where it's a bit more crucial than in audio that what comes out conforms exactly with what went in.
Of course, individual recordings can suck, but that's the fault of the producers, not the format. Garbage in, garbage out(with precise fidelity).
