Welcome to the SMD forum!
So I just recently bought a Crescendo Audio Symphony S2 and a pair of the Crescendo Mezzo SQ2 6.5" Components. Just thoughts on how the performance is on these reviews etc. I can barely find anything on these items from crescendo. mezzo 6.5’s Power rating RMS 150 Watts Sensitivity 90.8 dB 1W/1m Frequency response 45Hz - 22KHz Impedance 4 Ohm Crossover Slope 2 x 18 dB L/H Crossover Frequency 3400 hz S2 Rated Power output @ 13.8v (RMS): 2ohm: 300w x2 4ohm: 190w x2 Bridged 4ohm: 600w