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RetroSound Radio Motors

The technology behind every RetroSound radio

RetroSound radios are built around a modular Motor system. The Motor is the core electronic unit that determines your radio’s power output, inputs and outputs, expandability, and advanced features.
While the radio face controls the appearance and fit in your dash, the Motor controls how your radio performs.
All RetroSound motors include built-in Bluetooth for wireless music streaming and hands-free calling. The difference between motors comes down to power, connectivity, and advanced digital capability.

Why Choose a Modular Motor System

The modular Motor design gives you flexibility without sacrificing a period-correct look. Choose the level of technology that fits your build today and upgrade later as your system evolves.

Choose Your Motor

Select the Motor that matches your system requirements, speaker setup, and desired features. When choosing a radio face be sure to note that the part number will end in the corresponding motor number shown in parenthesis below.

Motor 1B (-M1)

Essential Bluetooth Motor

The Motor 1B is the foundation of the RetroSound modular system. It delivers dependable AM/FM performance with built-in Bluetooth for wireless streaming and hands-free calling. Featuring a single auxiliary input and white display illumination, Motor 1B is designed for simple systems and classic vehicles using factory or lightly upgraded speakers.

Best For

  • Stock or factory replacement speakers
  • Bluetooth streaming and hands-free calling
  • Simple installs with minimal inputs

Key Features

  • Built-in Bluetooth standard on all RetroSound motors
  • Single auxiliary input for external audio devices
  • White display illumination only
  • Upgradeable modular design
  • Built-in Bluetooth® (Version 5.0)
  • Includes Bluetooth® microphone for hands-free calls
  • AM/FM RDS tuner with 30 presets
  • Selectable tuner frequencies USA/EUR/AUS/JAP/RUS
  • Auxiliary input for portable devices
  • Built-in 275-watt (peak power) Mosfet amplifier
  • 18 watts RMS x 4 channels – TrueRating™
  • Non-volatile memory
  • 1-Year Warranty
  • Assembly is required

Motor 2B (-M2)

High-Power USB Motor

Most Popular Choice

The Motor 2B is RetroSound’s most popular motor upgrade and the ideal choice for most classic car and truck builds. It adds a built-in 300 watt internal amplifier, USB connectivity, and expanded audio outputs for improved sound quality and system flexibility. Dual RCA pre-outs and a dedicated subwoofer output make it easy to integrate external amplifiers or a subwoofer. The display color is fully customizable to match your vehicle’s interior.

Motor 2B offers the best balance of power, features, and value.

Best For

  • Aftermarket or upgraded speakers
  • Louder, cleaner sound without an external amplifier
  • Systems with subwoofers or external amplifiers
  • Custom display color matching

Key Features

  • Built-in 300 watt internal amplifier
  • USB input for media playback and charging
  • Dual RCA pre-outs and dedicated subwoofer output
  • Selectable multi-color display illumination
  • Bluetooth standard
  • Built-in Bluetooth® (Version 5.0)
  • Includes Bluetooth® microphone for hands-free calls
  • AM/FM RDS tuner with 30 presets
  • Selectable tuner frequencies USA/EUR/AUS/JAP/RUS
  • USB port for flash drives and other devices
  • 2.1-amp device charging via USB
  • Built-in 300-watt (peak power) Mosfet amplifier
  • 25 watts RMS x 4 channels – TrueRating™
  • Dual RCA pre-outs for external amplifiers
  • Dedicated subwoofer output
  • Adjustable color display
  • Non-volatile memory
  • 1-Year Warranty
  • Assembly is required

Motor 4HD (-M4)

App-Enabled Flagship Digital Motor

The Motor 4HD is RetroSound’s flagship digital motor and most advanced platform. Designed for maximum control and future expansion, it is SiriusXM Ready and includes dual USB ports for expanded connectivity. The Motor 4HD is also the only RetroSound motor compatible with the RetroSound Radio App, allowing you to customize and control your radio directly from your smartphone.

This motor is built for enthusiasts who want the highest level of technology and long-term flexibility.

Best For

  • Feature-rich and advanced audio systems
  • SiriusXM satellite radio integration
  • App-based control and customization
  • The most future-ready RetroSound platform

Key Features

  • Exclusive RetroSound Radio App support
  • SiriusXM Ready capability
  • Dual USB ports for media playback and charging
  • Advanced digital architecture
  • Bluetooth standard
  • HD Radio® Technology
  • SiriusXM-Ready® (SXV300V1 tuner sold separately)
  • RetroSound App Compatible
  • Built-in Bluetooth® (Version 5.0)
  • Includes Bluetooth® microphone for hands-free calls
  • AM/FM RDS tuner with 30 presets
  • Selectable tuner frequencies USA/EUR/AUS/JAP/RUS
  • Two USB ports for flash drives and other devices
  • 2.1-amp device charging via USB
  • Built-in 300-watt (peak power) Mosfet amplifier
  • 25 watts RMS x 4 channels – TrueRating™
  • Dual RCA pre-outs for external amplifiers
  • Dedicated subwoofer output
  • Adjustable color display
  • Non-volatile memory
  • 2-Year Warranty
  • Assembly is required
Compatibility Notice – Identifying Motor 4HD Versions

The current Motor 4HD refers to the latest app-enabled version. To confirm which version you own, reference the model/serial marking and FCC ID on the motor unit and the part number on the box.

Current Motor 4HD (App-Enabled Version)

Motor 4HD app-enabled version label showing FCC ID and MOT4H1 marking
  • Motor unit label: Model / Serial marking: MOT4H1
  • Motor unit label: FCC ID: XXXXXMOT4HD-1
  • Box label: Part / Model Number: MOTOR 4HD-1

Previous Motor 4HD (Older Version)

Older Motor 4HD label showing FCC ID and MO4H marking
  • Motor unit label: Model / Serial marking: MOT4H
  • Motor unit label: FCC ID: XXXXXMOT4HD
  • Box label: Part / Model Number: MOTOR 4HD

App functionality is available only on the Motor 4HD-1 and Motor 4DAB.

Which Motor Is Right for You?

All RetroSound motors include Bluetooth.

For simple systems and factory speakers.

Choose Motor 1B

For high-power performance and
system expansion.

Choose Motor 2B

For advanced digital features and
app-based control.

Choose Motor 4HD

Compare RetroSound Radio Motors

All motors include Bluetooth. Use this table to choose the best Motor for your audio system.

Feature Motor 1B Motor 2B Most Popular Motor 4HD
Bluetooth (streaming and hands-free calling) Yes Yes Yes
Auxiliary input (AUX) Single input Yes Yes
USB ports No 1 2
Built-in amplifier 275 watt internal amplifier 300 watt internal amplifier 300 watt internal amplifier
RCA pre-outs (for external amplifiers) No Dual RCA pre-outs Dual RCA pre-outs
Dedicated subwoofer output No Yes Yes
Display illumination White only Selectable multi-color Selectable multi-color
RetroSound Radio App compatibility No No Yes, exclusive
SiriusXM Ready No No Yes
Best for Simple systems and factory speakers Most builds needing more power and expandability Enthusiasts wanting maximum control and advanced features

Notes: Motor availability may vary by radio model.

Looking for DAB Motors?
Motor 1 DAB | Motor 4HD
View International DAB Radio Motors
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