25% Off

RDL ST-ACR1 Line-Level Audio Controlled Relay, 0.5 to 5 Second Delay

SKU: RDSTACR1 MFR: ST-ACR1
$141.93
$189.25
Save: $47.32 (25%)
Earn VIP Reward Points

Key Features

  • Enhance your studio with this audio controlled relay, perfect for recording environments.
  • Achieve seamless audio transitions using the adjustable 0.5 to 5 second relay release delay.
  • Enjoy low noise performance with balanced bridging, ideal for professional audio setups.
  • Easily manage loudspeaker systems using the versatile speaker delay controller feature.
  • Dependable studio equipment: Benefit from a robust double-pole-double-throw relay contact.
  • Optimize sound quality with adjustable input sensitivity from -30 dBu to 0 dBu range.
See More Product Details
Special Order?Estimated to Ship: 08/15/2025
Calculate Shipping

See Options

1

Protect your gear with Adorama Protect.* Learn more

1 Year

$15.99

2 Year

$23.99

3 Year

$35.99

Available to U.S. customers only.

Need help? Ask our experts.

Overview
Compare
Specs
Protection
Q&A

Questions & Answers

Reviews about this item

Review Summary

Select a plan in the Add Protection section above and purchase with this product by clicking “Add to Cart”.

image-protection

TRUSTED PROTECTION PLANS, EXCEPTIONAL SERVICE.

Invest In Your Gear and Peace Of Mind!

Accidents happen. Protect your favorite Adorama products and purchase a protection plan to stay covered from accidental damage, mechanical or electrical failures, and more.

Repair or Replacement

Repair or Replacement

If we can’t fix it, we’ll replace it at no additional cost.

Accidental Damage

Accidental Damage

Protect your product from drops, spills, and more.

Peace of Mind

Peace of Mind

Enjoy your gear without fear. We have you covered!

Failure Protection

Failure Protection

When regular use of your product over time results in mechanical or electrical failure.

Zero Deductible

Zero Deductible

We will never charge you a deductible after the purchase of a plan.

Customer-Focused Support

Customer-Focused Support

Our claims process is simple & easy and our customer service team is happy to help.

Adorama Protect powered by Extend is available for purchase to customers in the United States. Not available for international or U.S. territories purchases. Plans on open box items do not cover pre-existing damage.
Adorama Protect plans are available for ABS clients. If you have any questions or require assistanse, please call 800-223-2500

RDL ST-ACR1 Specifications

  • Audio Input

    10 kOhms balanced bridging

  • Input Connections

    May be connected balanced or unbalanced
    Control Output: Open-collector at 25 mA suitable to drive indicators or slave LCR relay

  • Indicators

    Audio threshold LED (for setting sensitivity)

  • Retrigger Delay

    250 ms

  • Contacts

    Double-pole-double-throw

  • Max. Switching Power

    60 W, 125 VA

  • Max. Switching Voltage

    220 Vdc, 250 Vac

  • Max. Switching Current

    2A

  • Activation Response Time

    25 ms

  • Input Sensitivity

    -30 dBu to 0 dBu (adjustable)

  • Relay Release Delay

    0.5 sec. to 5.0 sec. nominal (adjustable)

  • Ambient Operating Environment

    0 to 55 deg. C (32 to 131 deg. F)

  • Power Requirement

    GROUND-REFERENCED, 24 Vdc at 50 mA (Assumes 20 mA max load at SLAVE output)

  • Dimensions (HxWxD)

    0.7 x 3 x 1.6" (1.78 x 7.62 x 4.06cm)

  • UPC Code

    813721011152

About RDL ST-ACR1

Bring precision and reliability to your audio control applications with the ST-ACR1 Line-Level Audio Controlled Relay, a standout member of the esteemed STICK-ON series. This high-quality device is engineered for efficient and user-friendly operation, making it a go-to solution for professionals seeking to manage audio signal delays with exactitude.

Crafted with durability in mind, the ST-ACR1 is ideal for a wide array of environments, from bustling sound reinforcement systems to the meticulous settings of recording studios and the dynamic atmosphere of live performances. Its robust design ensures consistent performance, allowing you to switch on line-level sources with confidence.

The ST-ACR1 is equipped with two precision multiturn trimmers that offer granular control over your audio setup. The SENS potentiometer allows for fine-tuning of the audio input sensitivity, ensuring your system responds accurately to the desired signal level. The intuitive threshold LED indicator aids in making precise adjustments, so you can achieve the perfect balance for your audio needs.

With the ability to trigger on signals ranging from -30 dBu to 0 dBu, the ST-ACR1 provides the versatility required for a variety of audio applications. The DELAY control is particularly noteworthy, offering an adjustable time frame from 0.5 seconds to 5 seconds for the relay to release once the audio falls below the set threshold. This feature grants you the power to tailor the audio output with remarkable precision, making the ST-ACR1 a superior choice for those who demand exact timing and control.

Choose the ST-ACR1 Line-Level Audio Controlled Relay for its blend of efficiency, user-friendliness, and the reliable quality synonymous with the RDL brand. Elevate your audio control experience with this essential tool that stands out for its precise delay adjustments and steadfast operation.

RDL ST-ACR1 Features

  • Switching Controlled by Audio Signal
  • Sensing of Line-Level Signal
  • Silence Sensing
  • DPDT Switching Contacts
  • Open-Collector SLAVE Output

Product Documents

User Manual

Key Features

  • Enhance your studio with this audio controlled relay, perfect for recording environments.
  • Achieve seamless audio transitions using the adjustable 0.5 to 5 second relay release delay.
  • Enjoy low noise performance with balanced bridging, ideal for professional audio setups.
  • Easily manage loudspeaker systems using the versatile speaker delay controller feature.
  • Dependable studio equipment: Benefit from a robust double-pole-double-throw relay contact.
  • Optimize sound quality with adjustable input sensitivity from -30 dBu to 0 dBu range.

What's in the box:

  • RDL ST-ACR1 Line-Level Audio Controlled Relay
  • RDL 3 Year Limited Warranty