While electric bass players have used regular guitar amplifiers in large concerts since the 1960s, this is usually just for the higher register; a bass amp is still typically used for the low register, because regular guitar amps are only designed to go down to about 80 Hz. One of the reasons bassists split their signal into a bass amp and an electric guitar amp is because this arrangement enables them to overdrive the higher-register sound from the electric guitar amp, while retaining the deep bass tone from the bass amp. Naturally-produced overdrive on bass obtained by cranking a tube amplifier or solid-state preamplifier typically results in a loss of bass tone, because when pushed into overdrive, a note goes to the upper octave second harmonic.