Contact us
Close contact box
Connect ID #
368 317 031 3

Call center hours

Connect ID #
368 317 031 3
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

We're sorry, chat is not available at this time. Please visit our Support page to find the help you need.

Please enter your name.  
Please enter a valid email address. Why is this required?
Please enter your US phone number.  

For Tech Support, call 1-800-955-9091

Thank you, !
Our conversation will be emailed to
Please enter a question  
Please select an email topic.  

Looking for tech support?
Please call us at 1-800-955-9091

Need help now?
Call an advisor: 1-888-955-6000

Please enter your name.  
Please enter your US phone number.  
Please enter an email.  
Please enter an email.  
Please enter a message  

Calls may be recorded for training and quality control purposes.

Crutchfield call centers are located in Virginia USA.

Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  
Please enter a message  

Calls may be recorded for training and quality control purposes.

Crutchfield call centers are located in Virginia USA.

Rolls DB228

In-wall impedance-matching interface

Item # 172DB228

Need help?
Contact our Virginia-based experts.

Item # 172DB228

Ships free

In stock
$79.00 each
Need help?
Contact our Virginia-based experts.

About the Rolls DB228

Get a free system design

After we gather your information, we’ll send you a detailed system plan. It will include a link to a pre-filled shopping cart. Ordering is easy, and delivery is fast.

This in-wall interface allows you to connect a microphone and an unbalanced stereo source, like a phone or consumer CD player, to your commercial audio system that passes balanced signals. The front panel includes a 3.5mm unbalanced input and an XLR balanced input, with a level control knob. A pluggable balanced barrier strip output is included.

Product highlights:

  • XLR balanced input jack for connecting a microphone
  • 3.5mm TRS jack for connecting an unbalanced stereo source
  • rotating input level knob adjusts both inputs
  • pluggable barrier strip balanced output
  • frequency response: 50-20,00 Hz (±3dB)
  • installs in a standard single-gang junction box, not included
  • fits a standard Decora wall plate, not included
Dimensions and warranty:

What's in the box:

  • Wall interface
  • 3-Pin Euroblock (Phoenix) connector (pre-attached to back of interface)
  • Instruction sheet

Customer reviews

We don't have any reviews, yet.
Submit a review and then enter to win a $350 rewards card.
Be the first to review this product

Loading reviews...

Thanks for submitting your review

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee purchase (What's this?)



Crutchfield response

<< >>

More details on the Rolls DB228

Russ B.

Product Research


Overview: The Rolls DB228 is an impedance matching interface that lets you convert a high impedance, unbalanced 1/8" stereo input along with a microphone into a low impedance, balanced audio system via a Rolls proprietary audio transformer. The DB228 is a completely passive device, requiring no power for operation, and is designed to be wall-mounted.

Front Panel:

  • XLR: A balanced XLR input is provided for connecting a dynamic microphone (sold separately).
  • 1/8": A stereo unbalanced TRS jack can be used for audio playback from a smartphone, tablet, MP3 player, or other portable audio player.
  • Level: A rotary dial adjusts the input level of both the Mic and the 1/8" stereo input simultaneously.
    • Note: The individual signal levels of both inputs must be adjusted at each output device.

Output Connector: A rear-panel, 3-pin Euroblock connector provides a balanced, low-impedance audio output. The terminals can accept up to 14AWG speaker wire and are conveniently numbered for a balanced connection. The output signal is microphone-level.

  • Pin 1: Ground
  • Pin 2: Hot or + (in-phase)
  • Pin 3: Cold or - (inverted)

Mounting: The DB228 is designed to be mounted in a standard single-gang j box and can be trimmed in a standard size Decora wall plate (both sold separately).

  • Dimensions:
    • Width: 1.52"
    • Height: 4.13"
    • Total Depth: 2.58"
    • Mounting Depth: Approx. 2.04" (incl. wire)


  • XLR Input Impedance: 600O
  • 1/8" Input Impedance: 20kO
  • Frequency Response: 50Hz-20kHz (± 3dB)
  • Weight: 0.25 lbs.

Loading accessories...

Customer Q&A

Loading articles...