RDL TX1W Music On Hold Amplifier

Herman # RDLTX1W




The TX‑1W is the ideal choice in on‑site installations where the central telephone switching unit needs to be fed with music, voice or combined music/voice signals.

There is a wide variety of telephone instruments in use. When a caller is placed on hold, the audio quality perceived is affected by the caller's own telephone, as well as the telephone lines, central switch and on‑site equipment. Due to these variations, conventional audio amplifiers used as music‑on‑hold drivers frequently produce annoying artifacts at the caller's earpiece. Attempts to reduce listener fatigue through high‑frequency rolloff alone tend to produce a muffled, tired sound.

The TX‑1W features a spectral response specifically characterized to match the broadest variations in telephone audio distribution, producing a lively, crisp, interesting sound without the annoying resonances and distortions prone to creating listener fatigue.

  • Feed Audio into Telephone Equipment Music‑on‑Hold Input
  • Adjustable Audio Level
  • Optimized Sound Quality
  • Unbalanced Output, up to 1 Watt
  • Balanced Transformer driver Output
  • Ultra Compact Size


Unbalanced via standard phono jack

Input Level:

‑10 dBV nominal


‑10 dB to +25 dB (adjustable)

Frequency Response:

Tailored to phone systems within 20 Hz to 20 kHz spectrum


< 0.5% (1 kHz @ Maximum Output 1 W)
< 0.2% (1 kHz @ +4 dBu)

Residual Noise:

< ‑75 dB (referred to 600 Ω +4 dBu, or to 1 W RMS)


1 Balanced @ 600 Ω to drive transformer inputs 1 Unbalanced adjustable line‑level to 1 W

Power Requirement:

GROUND‑REFERENCED, 24 to 33 Vdc @ 150 mA

Ambient Operating Environment:

0° C to 50° C

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