Some of the preamps that have been mentioned have output impedances that are too high at some frequencies to be optimal (or even suitable) for use with some power amps. Some of the preamps that have been mentioned have input impedances that are too low to be optimal (or even suitable) for use with some source components. Some of the preamps that have been mentioned have too much gain to be optimal (or even suitable) for use with some combinations of source components, power amps that have high gain, and speakers that have high efficiency. Some even have too little gain to be suitable for use in some systems.
An indication of what associated components the preamp would be used with would result in answers that are more focused.
Good luck. Regards,
-- Al
An indication of what associated components the preamp would be used with would result in answers that are more focused.
Good luck. Regards,
-- Al