Mackie Onyx 24.4 is a 24 channel, 4 bus live sound mixer for use in mid-size venues. Much like the preceding SR series mixers, the Onyx 24.4 is designed to deliver optimum, professional quality in a compact, portable frame. 24 input channels feature 1/4in phone line level connectors and Mackie's famed Onyx microphone preamplifiers. The Onyx microphone preamps boast an impressive 123dB total dynamic range, -129.5 dBm Equivalent Input Noise (EIN) and 0.0007% Total Harmonic Distortion (THD) for an overall sound that rivals expensive "boutique" mic preamps. The Onyx 4-bus mixers feature an internal compressor / limiter for complete control over dynamics, transients and level fluctuation. Each channel features Mackie's patented 4-band Perkins EQ for high quality "British" EQ style signal contouring. There is no shortage of routing options with its 6 x 2 matrix providing sufficient monitor sends, 4-bus group outputs for routing channel signal to recorders and direct outputs on DB-25 connectors. The Onyx 4-bus live sound consoles are full featured, portable work-horse mixers for touring, small venue, house-of-worship, schools, halls and more.