The RCA output on the Edifier T5 subwoofer serves as a pass-through for the audio signal, but it does not filter the frequencies and simply passes them on. This means that the output is not intended for connecting a second subwoofer in a chain to filter or split the frequencies.

Instead, the RCA output of the Edifier T5 can be used to pass the audio signal to other speakers or a system without filtering the frequencies. If you want to add a second subwoofer, you should do this directly via the audio source or a separate subwoofer input instead of chaining the subwoofers together.

Thanks for the quick reply, does it make sense to turn the subwoofer 180° because of the bass reflex tube? So the bass reflex tube looks upwards, as I hit my sideboard on the left side, as the bass reflex tube is directed to the right in the T5, or is that a bad idea?