Subwoofer Sounds what to do?

I look with my Bose Soundlink Mini 2 and my Heco Ultraspace 510 subwoofer Netflix through the jack from the subwoofer into a y cable. In the other input of the y cable is an aux cable from my Playstation for the sound. The jack plug of the y cable is then finally in my Bose Soundlink Mini 2. When listening to music with my phone, everything is good jz, however, one hears from the subwoofer a little sound so the votes and then delayed about half a second mili second so that it sounds easily because the main sound comes from the Bose box. What can I do so that the subwoofer only bass comes and no sound in the sense of sound of the film more?

Crossover before the sub?
https://www.amazon.de/...00F61NRT4/

2 so-looking regulators are installed in my subwoofer behind do not know I've probably already? Because after a bit of playing around I've managed that it no longer sounds and still bass comes the bass is a bit lighter but still strong

So in finished systems crossovers are usually already present.
You should have a volume control and one for the crossover itself. This sets the cutoff frequency at which the subwoofer gets signal. A low pass, so to speak. The only lets through low tones.
Under ~ 250Hz should only be heard bass. The human voice only comes down to about 300Hz.

Yes, I can tell you how loud the bass is and how strong it is. Thanks for the help, I do not know anything about subwoofers.