Robert
Tapehead
I think compensating for the 3K to 10k region droop of a dB or so that MMs are prone to. I just measured my G1022 and see this with a strong 6dB pesk at 16kHz
What you need is a good, clean, quiet stage with fundamentally accurate RIAA, like the £140 Cambridge C651P, and an equaliser.
Not only can you then partially correct for tonal inaccuracy in the cartridge but you can dial in the additional air, warmth, weight etc that everyone gets excited about when they spend £5k on a phono stage.
Or you can buy an expensive 'fixed' box, hope that it was was designed by a competent engineer and lump up.
Nearly all discussion around 'the best' when it comes to phono stages is centred on which response inaccuracy floats your subjective boat. Unlike other amplifiers which are nominally flat in response, RIAA stages always have some degree of error which is usually audible.
That's great and I'm all for it, but there are far better/easier ways to do things than swapping one mans box of inaccurate for another
The other elephant in the room is loading, especially with MM class cartridges.
This usually receives no attention, and the standard values on many stages are patently wrong for many of the cartridges people will use, causing and compounding error even further.
To give you an example, I'd wager over 80% of AT and Ortofon MM/IM users out there have far too much capacitance on the their cartridges, causing early peaking and premature roll-off.