The NQ-GAXMR1 Distributed Audio Transformer provides impedance and voltage matching and is primarily designed for use with Bogen’s low-impedance (4-ohm/8-ohm), PoE-based, integrated amplifier modules (NQ-GA10P, NQ-GA10PV, NQ-GA20P2, OR NQ-GA40P3) when the user needs to connect to one or more 25V or 70V transformer tapped speakers. While the NQ-GAXMR1 can also be used with other low power, low-impedance, Class D amplifiers, it's very important to note that any such amplifier must be capable of setting a high-pass (low-cut) filter at a minimum of 50Hz to prevent distortion that can occur due to transformer saturation.