Four Fan for more efficient cooling
8 Ω stereo power 
frequency response:- 20Ηz-20KHz(+0/_0.3db)
THD+N :-
S/N Ratio :- >95db
Damping factor :- >800
Crosstalk :- >70db@8Ω 1KHz
Input Impedance :- 20kΩ( Balance)/10KΩ (Unbalance)
Output Circuitry :- Class H
Protect :- overheat short circuits, DC , Limit and softstart, Output relay-Zero Current switch, Intellctual clip limiter
Height :- 3U

QD Audio new CA series features faster reaction speed higher of damping factor and great function, higher level protection function , protection technology, special technology of SMD excellent component . 5200,1943 adopts TOSHIBA transistor to supply the high power and steady quality.
CA series have the following Advantages.
1:- This amplifier is noise free. it will increase the quality of work.
2:- It can make less distortion for a better quality sound.
3:- Integrate protect impact function of power soft -start, DC output protect function, longtime over-heat protect function and delay function. This function can protect the circuit faster when the amplifier short circuits and overloads. This will give it a steady performance for a long period of time.
4:- This series amplifier has excellent and natural timber. The adequate power gives very good control for the speaker.
5:- The unit has various input/output connectors it has three ways sensitivity switches for your level choice of stereo, bridge-mono and parallel mono.it can connect to the speaker quickly with professional Speakon.
6 crossover selector function. (only for CA 12, CA 18, CA 20 ) Turn this function ‘ ON’ if you want to use the power amplifier with one or more subwoofer speakers.
Height 3 u