Sonifex Redbox RB-UL4, Quad 2-channel balancer, Change from unbalanced to symmetric, Trimmer level adjustable from -15 dBu to +15 dBu, 8 RCA inputs unbalanced, 8 XLR outputs balanced, Frequency response 20 Hz to 20 kHz, Dimensions 48 cm (W) x 10.8 cm (W) x 4.2 cm (H), Weight: 1.3 kg