I had one of the standalone phono stages - I RBX-970?. I used it with MM cartridges and it had what I would characterize as appropriate gain - I think that means about 20dB but I'm not sure.
I don't think that it is good enough to really match tonearms against it. It is a competent phono stage, but no more. It is lacking in detail, and the bass is nothing to write home about. Sound stage was adequate+, far less than my other phono stages. (Phonomena--$600, CJ Premiere 15--$2500 used. Of course, for the price differential, they should be better, and they are.
I don't think that it is good enough to really match tonearms against it. It is a competent phono stage, but no more. It is lacking in detail, and the bass is nothing to write home about. Sound stage was adequate+, far less than my other phono stages. (Phonomena--$600, CJ Premiere 15--$2500 used. Of course, for the price differential, they should be better, and they are.