KAB calculator that jls001 linked to above is very helpful. Unless you are running a very unusual system (passive pre-amplfier, flea type amplifiers with extreme hi-efficiency speakers, etc.), I think you will find it will give you a very accurate read on the type of gain optimization you need to do with the cartridge/phono stage interface.
It has been pretty much deadly accurate for me using multiple cartridges and phono stages over the years.
For compliance calculations and cartridge/tonearm matching the calculator at vinylengine will also work well
http://https//www.vinylengine.com/cartridge_resonance_evaluator.php
Your phono preamp has probably close to perfect gain for either the high output or medium output Benz and the compliance numbers are favourable on both with your SME arm which has an effective mass of 10./11.
Your decision IMO should be based only on whether the medium output Benz will outperform the high output version as the gain numbers from your phono pre are just about perfect for both and your phono pre also has load adjustment/capability that is also favourable to both. And the cartridge(s) would appear to also be a perfect match with your arm. Consider yourself very lucky!
I would definitely avoid the low output version.
It has been pretty much deadly accurate for me using multiple cartridges and phono stages over the years.
For compliance calculations and cartridge/tonearm matching the calculator at vinylengine will also work well
http://https//www.vinylengine.com/cartridge_resonance_evaluator.php
Your phono preamp has probably close to perfect gain for either the high output or medium output Benz and the compliance numbers are favourable on both with your SME arm which has an effective mass of 10./11.
Your decision IMO should be based only on whether the medium output Benz will outperform the high output version as the gain numbers from your phono pre are just about perfect for both and your phono pre also has load adjustment/capability that is also favourable to both. And the cartridge(s) would appear to also be a perfect match with your arm. Consider yourself very lucky!
I would definitely avoid the low output version.