I just replaced a copper mat for a cork/rubber mat on my Garrard 301, this was done because of a newly mounted cartridge.
Metal mat tends to accentuate certain frequencies, in some setup, the copper will sound better. It all depends on the turntable components as a whole and your listening preference.
Metal mat tends to accentuate certain frequencies, in some setup, the copper will sound better. It all depends on the turntable components as a whole and your listening preference.