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Radio Design Labs D-TPA1A
3.5W Power Amp, Format-A


Radio Design Labs' D-TPA1A modules are two pair audio amplifier modules compatible with RDL Format A twisted pair products.
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Radio Design Labs D-TPA1A
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Radio Design Labs' D-TPA1A modules are two pair audio amplifier modules compatible with RDL Format A twisted pair products. Each D-TPA1A receives stereo audio and 24 Vdc power through a rear-panel RJ45 jack. The left and right audio signals received on pairs B and C of the twisted pair cable are summed to mono and amplified. The amplified output level is set by an internal VCA which is controlled by a front-panel volume control. The VCA attenuator provides years of scratch-free gain adjustment.

The D-TPA1A circuits are all designed for low power consumption. Amplification is provided by a high-efficiency Class D power stage with audio filtering tailored for crisp, pleasant audio clarity. The high-efficiency Class D output stage produces negligible heat for all levels of expected voice or music modulation. When the user reduces the audio level to minimum, the class D output stage is switched off. This sleep mode remains active until the user turns up the output level.

The output drives either a 4 Ohm or 8 Ohm speaker. The speaker cable connects to the module using a detachable terminal block.
The front panel does not include any illuminated indicators, making the D-TPA1A ideally suited to installation in dark rooms or areas. Installation is simple and quick, requiring only the connection of the speaker leads and the twisted pair RJ45.

The D-TPA1A may be fed and powered from any RDL Format-A sender, and is ideal in hospitality installations fed from a sender connected to a TV monitor (for example: FP-TPS4A Audio Sender from TV with fixed audio output level).

Use the D-TPA1A wherever a single speaker user-adjustable wall mounted amplifier is needed. Combine the amplifier with other RDL Format-A products for a cost-effective, high-performance audio system.

Radio Design Labs D-TPA1A Features:

  • 3.5 Watt RMS Audio Amplifier into 8 Ohms
  • 6.5 Watt RMS Audio Amplifier into 4 Ohms
  • Output Drives 4 or 8 Ohm Speaker
  • Setting Level to Minimum Activates Energy-Saving Sleep Mode
  • High-Efficiency Class D Operation
  • VCA Level Adjustment for Scratch-Free Long Life
  • Input and Power Connection on RJ45
  • Connects to Format-A Sender using Twisted-Pair Cable
  • Powered from RDL Twisted Pair Format-A Sender
  • Speaker Output Connection on Detachable Terminal Block
  • Ultra-Compact All Metal Construction
  • Thermal and Short-Circuit Protection

Radio Design Labs D-TPA1A Specifications:

  • Input: RDL Format-A
  • Input Connector: RJ45
  • Gain Adjustment: Single turn audio taper, VC Attenuator
  • Frequency Response: 50 Hz to 20 kHz (± 1.5 dB)
  • THD+N: < 0.1% (@ 1 kHz, 1 W)
  • Noise: <-70 dB (below 1 W RMS)
  • CMRR: > 60 dB (50 Hz to 120 Hz)
  • Output Power: 3.5 W RMS (max., into 8 Ohms); 6.5 WRMS (max., into 4 Ohms)
  • Power Consumption: 45 mA (idle), 95 mA (1 W into 8Ohms), 150 mA (1 W into 4 Ohms), 215 mA (3.5 W into 8 Ohms)
  • Sleep Mode Power Consumption: < 0.3 W
  • Sleep Mode Enable: Active at audio gain <-60 dB
  • Ambient Operating Environment:
    • Maximum: 0° C to 40° C
    • Recommended: 20° C
  • Dimensions (HxWxD): 4.13" x 1.7" x 2.15" (10.49 x 4.32 x 5.47 cm)
  • Package Type: Cardboard Box
  • Package Dimensions: 3.625" x 4.625" x 2.125"
  • Shipping Weight: 0.395 lbs.

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