Active Two-Pair Sender-Twisted Pair Format-A-XLR Microphone & Stereo RCA In-Black

Ideal Use Cases

The RDL DB-TPSL2A is designed for audio systems that need to place a microphone and a stereo consumer-level source onto RDL TP Format-A. Its input panel combines one balanced XLR microphone connection with two unbalanced RCA phono line inputs. The microphone is assigned to Format-A Pair A, while the left and right line channels are summed to mono and assigned to Pair B. This makes the black module a focused choice for input locations that require separate microphone and line-source feeds through a two-pair Format-A connection.

Why Choose This Model

The microphone input has a 1.2 kΩ balanced impedance and IEC 24 Vdc phantom power. Rear-panel gain selection provides 50 dB in NORM mode or 63 dB in HIGH mode, accommodating balanced microphone input levels from -45 to -65 dBu. Maximum microphone input is -40 dBu in HIGH gain and -28 dBu in NORM gain. The left and right RCA inputs each have a 10 kΩ unbalanced impedance, operate at a nominal -10 dBV level, accept up to +8 dBV, and provide 12 dB of gain. Studio-quality precision active balanced circuitry supports dependable signal transport through the Format-A architecture.

Installation and Integration

The DB-TPSL2A presents its RDL TP Format-A output through an RJ45 connection and uses two Format-A signal pairs. Power can be supplied remotely through the twisted-pair cable or locally through a detachable terminal block. When local power is used, a fused power feed supplies connected modules. The module requires 24 Vdc at 65 mA plus the requirements of connected loads. Recommended power supplies are the PS-24AS for the USA and PS-24AX for international use; the power supply is not included. A blue LED indicates that the module is powered.

The enclosure measures 1.6 inches wide by 4.11 inches high by 1.89 inches deep, or 4.06 by 10.45 by 4.8 cm. Installation requires a mounting box with a minimum depth of 2.4 inches, or 6.1 cm. The specified ambient operating range is 0°C to 55°C. These dimensions, power requirements, and mounting-depth specifications provide the concrete information needed to plan the installation and connected load budget.

Performance Highlights

The microphone path has a frequency response of 100 Hz to 30 kHz within ±1 dB. An integral low-cut filter is rated at -10 dB at 30 Hz. Microphone THD+N is less than 0.1% from 80 Hz to 20 kHz. Noise below +4 dBu is less than -80 dB in NORM gain and less than -70 dB in HIGH gain. Microphone common-mode rejection is greater than 60 dB in HIGH gain and greater than 65 dB in NORM gain from 50 to 150 Hz.

The line path extends from 20 Hz to 50 kHz within ±0.5 dB, with THD+N below 0.05% across that range. Line noise below +4 dBu is less than -95 dB. Headroom above +4 dBu exceeds 18 dB. Published line-to-line crosstalk is less than 90 dB at 1 kHz and less than 75 dB from 20 Hz to 20 kHz. The provided specifications also distinguish line-to-microphone crosstalk performance for HIGH and NORM microphone gain settings.

What Makes It Different

The defining feature is the module’s fixed two-path allocation. Pair A carries the balanced microphone signal, while Pair B carries the mono sum of the two unbalanced line inputs. This arrangement combines an XLR microphone interface, phantom power, stereo RCA input connectivity, active summing, and Format-A transmission in one module. The microphone and line paths retain their own gain structures: selectable 50 or 63 dB gain for the microphone and 12 dB gain for the line inputs. Remote powering, local terminal-block power, and a fused local feed provide multiple integration options within the stated 24 Vdc power requirement.

Final Assessment

For an RDL TP Format-A installation requiring one balanced microphone and one summed stereo RCA source, the DB-TPSL2A provides clearly defined routing, input ranges, gain settings, and measured audio performance. Its RJ45 Format-A output, remote or local powering, compact dimensions, and power indicator support planned system integration. Selection should account for the fixed Pair A and Pair B assignments, the 2.4-inch minimum mounting-box depth, connected power loads, and the separately purchased recommended power supply.