Yes, when the subwoofer is not connected, the frequency and volume knobs do not respond at all. I assume that there is a high-pass filter in the left and right channels that cuts low frequencies. When the subwoofer is disconnected, only high and middle frequencies are reproduced on the left and right channels. What to do to bypass the high-pass filter so that the entire frequency range is reproduced by the left and right channels without a sub?
Moreover, the built-in Bluetooth system has one drawback. Anyone can connect to it if they are not paired.
Moreover, the built-in Bluetooth system has one drawback. Anyone can connect to it if they are not paired.