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RDL TX-8A 4 and 8 Ohm Input Interface

B&H # RDTX8A Mfr # TX-8A
Usually ships in 7-14 business days

Availability Details


This item is usually Drop Shipped from the MFR/Distributor within 7-14 business days (subject to availability). Your order will be charged at the time of placing the order with the vendor. Item is non-cancelable and non-returnable.

International Orders*
For international orders, credit cards will be charged at time you place your order.

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Not eligible for free Expedited Shipping
You Pay: $79.24
Product Highlights
  • Transform Amplifier Output to Line Level
  • Bridges 4 and 8 Ω Speakers
  • Converts Levels from 0.5 W to 400 W
  • Bridge Input into Existing Amplifier
  • Can Feed a Subwoofer Amplifier Input
  • Detachable Terminal Block
  • Bifilar Winding Coils
  • Balanced or Unbalanced Output
  • Adjustable Input Power Voltage
  • Galvanic Isolation

The RDL TX-8A 4 Ohm/8 Ohm Input Interface is a mono audio transformer that can convert the output of a 4 or 8 Ohm amplifier into a line level input to be sent to an audio mixer or second amplifier. The transformer's frequency response extends low enough to make it suitable for feeding a subwoofer amplifier input. For situations when interfacing between a stereo output to a subwoofer input, two TX-8A modules may be used, one from each side of the stereo output signal, with their inputs combined as the subwoofer input.

The front panel level control of the transformer allows you to adjust the input power voltage to -10 dBV or +4 dBu. The unit can handle between 0.5 and 400 W of operational power and can be wired to output either balanced or unbalanced signals.

For easy wiring, the unit features detachable terminal block connections. To couple the audio input to the audio output, the transformer features bifilar coil windings. To prevent ground loops, the device is built with galvanic isolation. For convenience, the transformer may be mounted on the sides of a rack or on the rack rails using RDL's optional TX mounting accessories.

Input Connector 1 x Barrier block
Minimum Input Level For +4 dBu output: 8 W at 8 Ω or 16 W at 4 Ω
For -10 dBV output: 0.5 W at 8 Ω or 1 W at 4 Ω
Maximum Input Level 400 W
Attenuation 16 dB to 34 dB (input to output)
Output Connector 1 x Barrier block
Output Level -10 dBV unbalanced or +4 dBu balanced, adjustable (10 kΩ load)
Isolation Galvanic bifilar wound audio transformer
Frequency Response 20 to 20,000 Hz (± 0.75 dB)
THD <0.1% (1 kHz); <1% (20 to 20,000 Hz)
Power Requirement Passive
Dimensions (H x W x D) 3.0 x 1.2 x 1.5" (7.6 x 3.0 x 3.8 cm)
Weight 0.32 lb (145.15 g)

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