STP-1

RDL STP-1 - Universal Audio Attenuator, 2-Channel

The RDL STP-1 is a compact, passive audio attenuator designed for precise level adjustment in high or low impedance, balanced or unbalanced audio circuits. It features two independent screwdriver-adjustable attenuators, allowing accurate signal matching without the need for external resistors or jumpers.

STP-1 enables installers to fine-tune input levels, increase headroom, and match signal levels between devices. With a printed wiring legend on the housing, installation is quick and straightforward.

Functionality

• Precise audio level attenuation
• Adjust input levels to match equipment
• Set fixed reference levels in the system
• Increase input headroom
• Supports balanced and unbalanced lines
• Operates in high- or low-impedance circuits

Features

• Circuit type: passive, modified H & T pads
• Channels: 2 independent attenuators
• Adjustment: 15-turn screwdriver trimmers
• Nominal impedance:
  • HI-Z: 10 kΩ
  • LO-Z: 600 Ω
• Maximum signal levels:
  • HI-Z balanced: +33 dBu (35 V RMS)
  • LO-Z balanced: +27 dBu (18 V RMS)
  • HI-Z unbalanced: +35 dBV (45 V RMS)
• Reference levels:
  • Line: +10 dBu to -10 dBu
  • Mic: -45 dBu to -65 dBu
• Connections: terminal block (14-24 AWG), no lugs required
• Operating temperature: -20°C to 60°C

The RDL STP-1 is a practical and cost-effective solution for AV installers who need precise, passive attenuation at any point in the signal path - without affecting system integrity.