Problem, please, for help!

Hello and good day, so I have a little problem which gives me to think about. As components I have installed the following: > Next Q12 power amplifier – 2x70Wrms @ 4ohm or 1x210Wrms @ 4ohm – 1.5ohm stable – THD: 0.1% at 4ohm – Superbass at 45Hz +6dB – variable high/lowpass – Pre-Out – fuse: 1x25A – dimensions: 230x256x58 >Axton CAB 308 Subwoofer So lie I have 25mm2 power cables. That’s not my problem But I made the subwoofer about 1 week ago out of space, now I connected it exactly as before and as soon as I turn on the radio the sub goes off without music makes it bass (Hup), then first I shortened the cables to the subwoofer a piece and installed properly and yet the sound remains so music is impossible. I then took off the chinc cables, I have there quite normally from the radio a black and a red chic cable are placed then at 2 Y distributors on 4 chinc cables. The level has to the C cansclusmöglichkeiten IN = L and R and OUT= L and R. Has always worked and worked. Now I just put 2 chinc cables on one on IN and one on OUT and the rest left blank and see how it works. What can I do? BZW: How is it possible?