The AC30C2 and AC30CC2 are both models of guitar amplifiers produced by the company Vox.
The AC30C2 is a 30-watt, 2-channel all-tube amplifier that is part of Vox’s Custom series. It features two channels (Normal and Top Boost), a 12″ Celestion Alnico Blue speaker, and a variety of tone-shaping controls, including Treble, Bass, and Cut.
The AC30CC2 is also a 30-watt, 2-channel all-tube amplifier but it’s part of Vox’s Custom Classic series. It features two channels (Normal and Top Boost), two 12″ Celestion Alnico Blue speakers, and a variety of tone-shaping controls, including Treble, Bass, Cut, and Reverb.
So the main difference between the two amplifiers is the AC30CC2 has two speakers instead of one and also has a reverb feature which is not present in the AC30C2.