For orginal mono lps you need cartridge with 25um needle. Almost every record label had its own equalization curve. For example, Columbia.There's no such thing as a mono amp and preamp. Obviously amps come as mono or stereo, but what I mean is that there is no difference in signal processing.
Whether you use a single or two speakers is a matter of taste (and loudness). I use both setups. When I listen to a singie speaker, I simply disconnect the other.
The only "mono specific" equipment is the cartridge. A mono cartridge is optimized for mono "grooves". Note that mono recordings after roughly 1968 were pressed on stereo grooves, so a mono cartridge is not relevant for modern day mono LPs...
As far as EQ curves go, different curves apply whenever the RIAA norm was not used, which could be an entire topic on its own. There are stereo records that don't use RIAA...

Last edited: