The main speaker has all the connections at the rear, along with an optional subwoofer RCA output with a 100Hz crossover. Something like the Kanto Audio SUB8 would be ideal, but the low end is so ...

There’s no subwoofer output unlike the Edifier QR65 ... At the rear of the JBL 104-BT's main speaker are two of the inputs which are RCA, Balanced 6.35mm ... [+] TRS. The speakers also support ...