1. Check the input port type of the subwoofer. Joann SR40 1 power amplifier supports various input interfaces such as RCA and XLR, and subwoofers generally have corresponding input interfaces, such as RCA line or audio line input.

2. Determine the connection mode. Generally speaking, there are several ways to connect the subwoofer with Joann SR40 1 power amplifier: directly connect it with RCA cable. Insert the RCA line of the subwoofer into the input port of Joann SR40 1 power amplifier, and select the corresponding input source. Or using a preamplifier or reverberation. Connect the subwoofer and Joann SR40 1 power amplifier through the output interface of preamplifier or reverberation. A frequency divider can also be used. The frequency divider can separate the bass and treble signals and transmit the bass signal to the subwoofer. Connect the frequency divider to the output port of Joann SR40 1 power amplifier, and then connect the subwoofer to the bass output interface of the frequency divider.

3. Adjust the volume and frequency. After the connection is completed, adjust the volume and frequency control knob of Joann SR40 1 power amplifier to ensure that the output effect of the subwoofer meets the requirements.