(L8) 4-channel signal input and 2-channel stereo signal input 

(L10) 6-channel signal input and 2-channel stereo signal input

(L18) 14-channel signal input and 2-channel stereo signal input

(L24) 20-channel signal input and 2-channel stereo signal input

Technical Parameters 

Input Sensitivity MIC : -36dB    LINE : -10dB    Eff : -12dB   Tape In : -26dB 

EFFECTS : ECHO 12ms-200ms
Output Voltage : 4V MAX 
Less Than ( THD ) : 0.03% ( 1KHz Full Power ) 
Frequency Response : 20Hz ~20KHz   +/-3dB 

Headphone Output : 7V    220Ω
Power Consumption : 40W ( L8), 45W(L10),, 50W(L14),55W(L18),55W(L24)