Elysia Xpressor 500 Stereo Compressor - API 500 series format, discrete class A topology, auto fast attack, switchable release characteristic, warm mode, parallel compression, sidechain filter, gain reduction limiter, stepped potentiometers, analog dynamic LED meter. Frequency response: <10Hz-400kHz (-3dB). Noise floor: 20Hz-20kHz (-94dBu). Dynamic range: 20Hz-22kHz, 115dB. Maximum level in/out: +21dBu. Impedance: 10k Ohms in, 68k Ohms out. Includes Xpressor module (without frame).