The APT20 is phantom power supply unit containing two independent working channels for use with two condenser microphones. It supplies 48V DC to the microphones and routes the signal to a mixer or microphone amplifier. The connections are performed by using XLR connectors for the in- and outputs and at the back, there is an IEC power connector with power switch provided for connecting the APT20 to the mains network.
| Inputs | Connector | 3-pin XLR female |
| Outputs | Connector | 3-pin XLR male |
| Phantom Power | 48 V DC | |
| THD+N (@ 1 kHz) | < 0.0005% | |
| Signal / Noise | > 90 dB | |
| Frequency | Response (± 3 dB) | 20 Hz - 20 kHz |
| Power | Consumption | 3 W |
| Connector | 1 x IEC Mains connector with fuse | |
| Supply | 230 V AC / 50 Hz | |
| Dimensions | 4.33 x 1.73 x 6.30 " (W x H x D) | |
| Weight | 1.080 lb | |
| Construction | Aluminum | |
| Colours | Black | |
| Accessories | Included | Power cable |
