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Rolls DB228

In-wall impedance-matching interface

Item # 172DB228

California customers:
Please click here for your Proposition 65 warning.

Item # 172DB228

In stock
$89.00 each

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About the Rolls DB228

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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

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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.

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