5 out of 5
Pricing Note
Product Description
Manufacturer Part Number: DU30b
The DU30b is a feature-packed microphone and background music preamp with a small footprint. It has XLR input, as well as RCA inputs and outputs.
Key Features:
Overview:
Rolls DU30b Microphone Preamp with Audio Ducker
With the Rolls DU30b, when an announcement is made into the microphone, your background music is automatically "ducked" under the announcement, then the music is brought back to its previous level when the mic signal is no longer present. The diminutive size makes it perfect for installs where space is at a premium. AC power adapter included. Made in the USA.
Specifications: Frequency response: 20 - 40,000 Hz THD + noise: < 0.03% (typical) Connections: balanced XLR in, unbalanced RCA in and out Dimensions: 4" x 4" x 1.5" Weight: 1 lb.
For more than two decades, those in the know have turned to Rolls for the highest quality, reliability, and value. Rolls is an innovative company specializing in domestically manufactured signal interface accessories, mixers, amplifiers, and processors for the audio professional.
Specification:
Manuals & Resources:
The DU30b is a feature-packed microphone and background music preamp with a small footprint. It has XLR input, as well as RCA inputs and outputs.
Key Features:
- Automatically "ducks" music under the level of announcements
- Clean and quiet operation
- Perfect for restaurants, clubs, and many more applications
- Small form factor
Overview:
Rolls DU30b Microphone Preamp with Audio Ducker
With the Rolls DU30b, when an announcement is made into the microphone, your background music is automatically "ducked" under the announcement, then the music is brought back to its previous level when the mic signal is no longer present. The diminutive size makes it perfect for installs where space is at a premium. AC power adapter included. Made in the USA.
Specifications: Frequency response: 20 - 40,000 Hz THD + noise: < 0.03% (typical) Connections: balanced XLR in, unbalanced RCA in and out Dimensions: 4" x 4" x 1.5" Weight: 1 lb.
For more than two decades, those in the know have turned to Rolls for the highest quality, reliability, and value. Rolls is an innovative company specializing in domestically manufactured signal interface accessories, mixers, amplifiers, and processors for the audio professional.
Specification:
Product Details | |
|---|---|
| Brand | Rolls |
| Model | DU30b |
| Part Number | 245-1020 |
| UPC | 675889000306 |
| Unit of Measure | Each |
| Weight | 1.1 |
Manuals & Resources:
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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Customer Reviews
By Eric Zueff
Date: November 11, 2025
Magical
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Travis Epperson
Date: October 01, 2025
Using this to duck audio from the TV while Alexa is taking.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Scott
Date: April 13, 2024
Exactly as described super fast delivery
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Aaron
Date: November 07, 2023
I put this on my TV in the kitchen with an Echo dot triggering the ducking. The setup works great, alarms easily override the TV or music and if you set up Alexa with a wake noise it can even create some silence for a command
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Paul H. Mailloux
Date: August 30, 2022
Works good, no issues
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
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