RDL TX-MX2R Audio Mixer/Distribution Amplifier

The TX-MX2R is the ideal choice in installations requiring the active, isolated mixing of two unbalanced line-level audio sources to feed either one or two unbalanced destinations.

The input circuits are high-impedance, line-level (-10 dBV) and are each isolated from each other. Therefore the modules may be used to bridge an unbalanced stereo source without affecting the stereo separation. Each output from the TX-MX2R is a mono mix of the stereo signal. Normally, the gain trimmers are set to unity gain. If either channel is low, the gain of that channel may be adjusted up to 6 dB.

The TX-MX2R may also be used to mix two separate sources into a single output. The mixing circuit in the module is an active summing amplifier.

The output driver provides two separate, identical output signals from the input signal or signals. This output distribution amplifier therefore allows the TX-MX2R to be used as a two-output audio distribution amplifier. If it is desired to distribute a single source to two destinations, one of the inputs may be left unused without any loss of performance.

RDL TX-MX2R Features

• Mix 2 unbalanced mono signals
• Combine stereo into mono
• Gain trim for each input
• Two active isolated outputs from the input signal (s)
• Isolation between inputs
• High-Quality unbalanced audio

• TX-MX2R Audio Mixer/Distribution Amplifier1

• Inputs (2)Stereo (A/left and B/right) on detachable terminal block
• Input Impedance20 kΩ balanced or 10 kΩ unbalanced
• Input Level+4 dBu balanced (nominal), +25 dBu maximum; -10 dBV unbalanced
• Input Gain Adjustments (2)-5 dB to +15 dB (rel. +4 dBu balanced); -3 dB to +17 dB (rel. -10 dBV unbalanced)
• Input Metering (2)Dual-LED VU Meter for Input A and Input B
• Mono modeRear-panel switch-selectable (input A feeds all 16 outputs)
• Outputs (16)Stereo, A (8), B (8) on detachable terminal blocks
• Output Impedance150Ω balanced; 75Ω unbalanced
• Output Level+4 dBu balanced (nominal), +24 dBu maximum; -10 dBV unbalanced
• Output Level Adjustments (16)-9 dB to +6 dB (rel. +4 dBu, balanced); -3 dB to + 12 dBu (rel. -10 dBV, unbalanced)
• Frequency Response10 Hz to 165 kHz (+/- 0.25 dB); 10 Hz to 35 kHz (+/- 0.01 dB)
• THD+N< 0.0025% (20 Hz to 20 kHz)
• Headroom> 20 dB (above +4 dBu input or output)
• Noise< -92 dB (below +4 dBu output, 20 Hz to 20 kHz)
• Crosstalk< -85 dB (20 Hz to 1 kHz); <-70 dB (1 kHz to 20 kHz)
• CMRR> 90 dB (100 Hz)
• Ambient Operating Environment0°C to 50°C
• Power RequirementGROUND REFERENCED, 24 Vdc @ 140 mA (idle, nominal), 170 mA (max.)
• Case dimensions5.75" (14.6 cm)W x 1.65" (4.18 cm)H x 3.54" (9.0 cm)D; 3.9" (9.9 cm)D with connectors
• Package Dimensions6x6x2.625"
• Shipping Weight1.585 lbs
• WEEE weight1.34 lbs