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RetroSound Wonderbar 3 M4

Digital media receiver for select classic General Motors vehicles — does not play CDs (Chassis with Chrome Push Buttons)

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Item # 068WB3

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Overview

Our take on the RetroSound Wonderbar 3 M4

RetroSound's Wonderbar 3 M4 digital media receiver merges modern car stereo technologies with a nostalgic GM factory radio layout. The "wonder" bar provides an easy way to find your favorite radio station or music file — just tap your finger on the bar to jump back and forth through the selections. So, you get old-school looks with a bevy of new-school features, such as Bluetooth®, USB inputs, iPod® control, and a variable color display – all without cutting your dash. You'll need to select a knob set to complete this shaft-style radio for just the right look. (You'll choose knobs on the way to the Cart.)

New tech for your vintage GM vehicle

RetroSound's Wonderbar 3 M4 digital media receiver merges modern car stereo technologies with a nostalgic GM factory radio layout. The "wonder" bar provides an easy way to find your favorite radio station or music file — just tap your finger on the bar to jump back and forth through the selections. So, you get old-school looks with a bevy of new-school features, such as Bluetooth®, USB inputs, iPod® control, and a variable color display – all without cutting your dash. You'll need to select a knob set to complete this shaft-style radio for just the right look. (You'll choose knobs on the way to the Cart.)

Lots of ways to listen

Built-in Bluetooth allows you to talk hands-free or stream audio programming to the receiver with your smartphone, and you can connect your iPod or USB thumb drive to the two rear USB ports. You'll find two auxiliary inputs on the rear of the receiver for other sources, like a portable CD player or high-res player.

Enjoy your radio faves

If you're looking for radio stations that won't fade away when you drive out of town, add a SiriusXM tuner to this RetroSound radio to enjoy satellite radio's deep programming from coast to coast. The Wonderbar 3 M4 also offers excellent AM/FM reception, and will display song titles from any radio station that's broadcasting text information.

Added installation and sound options

This RetroSound receiver features three sets of preamp outputs that make it easier to add amps and subs to your vehicle. You can adjust your bass from the driver's seat, using the subwoofer level controls and variable low-pass crossover. For further customization, you can choose from 32,000 backlight colors so the LCD display will look just right in your dash.

Make it a complete RetroSound system

Wanna add some serious power to your ride? RetroSound offers strong amplifiers to get the most impact out of your speakers and subwoofer. They also make low-profile car speakers that fit into a wide range of older cars and trucks, so you can be sure that your sound system will do justice to your vintage vehicle.

Bluetooth note: Use of this receiver's Bluetooth features will depend upon your phone's Bluetooth capabilities. Learn more in our article explaining Bluetooth profiles.

This digital media receiver will not play CDs.

Product Highlights:

    General Features:
    • digital media receiver with chrome control face designed for classic GM cars (no built-in CD player)
    • chrome bezel and push buttons for radio presets
    • "Wonder" bar controls up and down for radio stations and track back and forward for music files
    • built-in Bluetooth for hands-free calling and audio streaming
    • plays MP3 and WMA music files from external sources (no internal CD player)
    • LCD display with 32,000 backlight color choices
    • non-volatile memory to retain saved presets when radio is disconnected from power
    Audio Features:
    • AM/FM tuner with 18 FM/12 AM presets and RDS
    • 3 EQ presets plus user-controlled bass/treble adjustment
    • subwoofer crossover and level controls
    Expandability:
    • compatible with SiriusXM satellite radio tuner
    • iPod/iPhone direct control and charging via USB input
    • inputs: two rear auxiliary inputs, two rear USB ports
    • outputs: 6-channel preamp outputs (2.85-volt front, rear, and subwoofer)
    Other Features and Specs:

    What's in the Box:

    • Radio body (M4 body)
    • Display face
    • 2 Infinimount shafts (with 11" harness attached to each one)
    • Microphone w/ bracket (attached 8'cable terminated by 3.5mm connector)
    • Main harness
    • Power harness
    • Speaker harness
    • 2 InfiniMount brackets
    • 2 InfiniMount spacers
    • 4 Bracket mounting screws
    • 4 Face mounting screws
    • 12 Nuts
    • 8 Washers
    • User's Manual
    • Quick Start Guide
    • "STOP" note
    Reviews
    Details

    Hands-on research

    Features and Specs

    Expandability
    AUX Input Mini (rear) x 2
    Audio/video Input ---
    USB Input Rear (2)
    CarPlay No
    Android Auto No
    Siri Control No
    Android Control Yes
    Memory Card Slot USB memory
    Bluetooth Compatible Built-in
    Satellite Radio Ready SiriusXM
    HD Radio No
    Navigation ---
    iPod Compatibility
    Full size Classic
    Nano 7/6/5/4/3
    Touch 6/5/4/3/2
    iPhone XSMax/XS/XR/X/8+/8/7+/7/6S+/6S
    General
    RMS Power (CTA-2006) N/A
    RMS Power (Manufacturer) 25 watts
    Peak Output 45 watts
    RMS Power Bandwidth Not givenHz
    Preamp Outputs 6-channel
    Sub Preamp Outputs Yes
    Switchable Rear Preamp Outputs No
    Video Screen No
    Preamp Voltage 2.85 volts
    Screen Size ---
    Display Color Variable
    Key Button Color N/A
    EQ Bands 3
    Wireless Remote No
    Steering Wheel Control Compatible No
    Parts Warranty 2 Years
    Labor Warranty 2 Years
    Tuner
    FM Sensitivity 12.5 dBf
    European Tuning Yes
    Seek/Scan Seek
    Radio Data System Yes
    High-res Playback No

    Product Research

    Shaft-Style Radio
    Variety of Sources
    Audio Section

    Shaft-Style Radio

    Vehicle Compatibility: The RetroSound Wonderbar 3 (M4) radio is designed to work in select classic 1949 to 1963 GM vehicles - including Chevrolet, Cadillac, Pontiac, & Buick.

    Note: Knob sets available separately.

    Infinimount System: The Wonderbar 3 (M4) radio features RetroSound's Infinimount System. In this design, the shaft knobs and the display face are not permanently mounted to the unit, but instead connect to the unit via a harness so you can space the radio's shaft knobs at various distances from the chassis of the radio, as well as mount the face independently from the chassis body using the supplied mounting brackets.

    Variable-Color LCD: The RetroSound Wonderbar 3 (M4) features variable color illumination display with over 32,000 of color variations. Choose from a selection of preset colors, have the unit scan through all preset color continuously, or customize your own color to better match your vehicle's interior lights. You can also adjust the brightness of the display to High or Low.

    Variety of Sources

    Built-in Bluetooth: The RetroSound Wonderbar 3 (M4) is equipped with built-in Bluetooth (HFP/A2DP/AVRCP) allowing you to make and receive phone calls wirelessly through the receiver; as well as stream music wirelessly from your Bluetooth-enabled smartphone to the head unit. Before using your Bluetooth enabled device, it must be paired to the Wonderbar 3 (M4). You can only pair one device at a time with this unit. Once paired, when your Bluetooth device is in close proximity to the RetroSound receiver, the auto connection function automatically connects the two units. The Wonderbar 3 (M4) is compatible with most Bluetooth enabled mobile phones, including the Apple iPhone & Android smartphones.

    • Hands-Free Communication: The Wonderbar 3 (M4) allows for wireless communication between the head unit and your Bluetooth enabled cell-phone. You can answer an incoming call from the head unit's front-panel control knobs. Incoming phone call information will be displayed on the unit's front-panel LCD and your music will be pause or muted. You will still use your phone to dial a phone number and then the call will transfer to the RetroSound radio. Use the included external microphone to speak into during your phone conversation, while the other party will be heard through your vehicle's speakers.
    • Wireless Audio Streaming: The Wonderbar 3 (M4) also allows you to play back stored music and  music apps from your Bluetooth-enabled phone or personal music player using a paired Bluetooth connection. Playback controls included Play/Pause, Stop, & Next/Previous Track. This unit does not display song/artist information from Bluetooth audio devices.
    Note: Due to the differences in Bluetooth technology, some Bluetooth enabled devices may be incompatible, function improperly, or may not support all features when used with the RetroSound Wonderbar 3 (M4).

    Dual USB Ports: The RetroSound receiver features two USB (type-A) ports connected to its rear chassis by a 40" pigtail. The USB ports enable connection of  portable USB mass-storage class (MSC) devices; such as a portable digital audio player or USB thumbdrive. Once you've connected your compatible USB device, the receiver will find your songs instantly and automatically start playing them. This unit supports MP3 (128 kbps +), WMA (64 kbps +), and FLAC music files in format FAT and FAT32. The unit can recognize a maximum of 999 songs/files (files will be read in order of creation and not alphabetically or numerically).

    • Controls: You will be able to control basic playback functions of your music files such as Play, Pause, Skip Track, Intro Scan, Repeat Track, and Random.
    • Display: The receiver also supports ID3-tags/WMA-tags for song/artist information. 
    • Charging: USB portable audio players that can be charged via USB will be charged when plugged into the receiver's USB port (max. 0.5A), and the vehicle's ignition switch is set to ACC or On.
    Notes:
    • Not compatible with Android mobile devices.
    • You cannot connect a USB device via a USB hub or Multi-Card Reader to this unit.

    iPod Direct Connection: Either rear-panel USB port can act as an iPod/iPhone high-speed direct connection when used with the USB/iPod cable that came with your iPod/iPhone. The USB connection allows your iPod/iPhone's stored music and music apps to be loaded instantly to the unit and sound quality to be maximized through the head unit's 1-bit D/A converter. The RetroSound Wonderbar 3 (M4) supports audio playback of stored music or music apps, music navigation, information display, and charging of select iPod/iPhone models.

    • iPod Control: You can control your connected iPod/iPhone from the head unit's front-panel control knobs. You can browse your iPod/iPhone's music by Playlist, Artist, Album, Song, Genre, Composer, or Podcast.  In addition, you can activate Repeat playback modes (all/track). Most iPod/iPhone device's clickwheel or touchscreen will be locked during connection (Apple devices w/ iOS 6.0+ will stay unlocked).
    • iPod Display: The Wonderbar 3 (M4) will display your iPod/iPhone's music file information from stored music. The head unit will display Track number, Elapsed playing time, Artist name and Song/Album title.
    • iPod Charging: The unit's USB connection provides 0.5A of current to power and charge your connected iPod/iPhone when your vehicle's ignition switch is set to the 'ACC' or 'On' position. This unit does not charge the iPad. If your iPod/iPhone has no initial battery charge, then the unit will not recognize it.

    iPod/iPhone Compatibility Chart: The RetroSound Wonderbar 3 (M4) is "Made for iPod/iPhone" compatible and supports the following iPod/iPhone model features -

    Apple Device Generation Tested Version Media Type Control Type Display Type Bluetooth Charge
    Audio Video Head Unit iPod/iPhone Artist/Song Text Track Info Phone Audio
    iPhone
    3G 4.2.1 Y N Y N Y Y Y Y Y
    3GS 5.1.1 Y N Y N Y Y Y Y Y
    4/4S 7.1.2 Y N Y Y Y Y Y Y Y
    5/5C 10.3.3 Y N Y Y Y Y Y Y Y
    5S/SE 12.1.3 Y N Y Y Y Y Y Y Y
    6/6+/6S/6S+ 12.1.3 Y N Y Y Y Y Y Y Y
    7/7+/8/8+ 12.1.3 Y N Y Y Y Y Y Y Y
    XS-Max/XS/XR/X 12.1.3 Y N Y Y Y Y Y Y Y
    touch
    2nd 4.2.1 Y N Y N Y Y N Y Y
    3rd 5.1.1 Y N Y N Y Y N Y Y
    4th 6.1.3 Y N Y Y Y Y N Y Y
    5th 9.3.5 Y N Y Y Y Y N Y Y
    6th 12.1.3 Y N Y Y Y Y N Y Y
    nano
    3rd 1.1.3 Y N Y N Y Y N N Y
    4th 1.0.4 Y N Y N Y Y N N Y
    5th 1.0.2 Y N Y N Y Y N N Y
    6th 1.2 PC Y N Y N Y Y N N Y
    7th 1.02 PC Y N Y N Y Y N Y Y
    classic 80GB 1.1.2 Y N Y N Y Y N N Y
    120GB 2.0.1 Y N Y N Y Y N N Y
    160GB 2.0.4 Y N Y N Y Y N N Y
    Note: Apple iPod/iPhone software updates may change functionality results. If you download a newer software version, you may need to reset the head unit and your iPod/iPhone to regain functionality. If this doesn't work, you may need to wait until a newer software update is available.

    Dual Auxiliary Inputs: The universal shaft-style receiver features two 3.5mm auxiliary inputs connected to the rear chassis by 7" pigtails. The Aux inputs provide a connection for portable external audio sources such as a MP3 player or  CD player.

    RDS AM/FM Tuner: The Wonderbar 3 (M4) features a built-in RDS AM/FM tuner. The Radio Data System (RDS) feature displays radio broadcast information such as artist & track information when listening to compatible AM/FM stations. The unit's tuner features 3 FM bands and 2 AM bands. A total of 30 AM/FM presets can be stored manually or automatically. Select between Local and Distant settings can aid in listening to weak FM radio stations or compensate for stations that have too strong of a signal. This unit's tuner can be set to USA or European tuning.

    SiriusXM Ready: The Wonderbar 3 (M4) is SiriusXM-Ready and connects to the SiriusXM SXV300 Connect Vehicle Tuner (220SXV300, sold separately). The SXV300 plugs directly into the head unit without the need for special adapters or cables. A SiriusXM subscription is also required. The SiriusXM Connect Vehicle Tuner supports SiriusXM programming with access to 175+ SiriusXM channels via subscription. Check out the most popular SiriusXM subscription packages here.

    • Category Search searches for channels in a certain category
    • Information such as Channel Name, Artist Name, and Song Title can be viewed on the head unit's display
    • Up to 15 SiriusXM Satellite Radio station presets
    • Channels containing unsuitable content for children can be blocked
    Note: A separate SiriusXM Satellite Radio subscription is required (operates on the XM Network). However, you can easily add this SiriusXM tuner to an existing Sirius or XM account for a Multi-Radio Discount Plan.

    Audio Section

    22W x 4Ch Amplifier: The Wonderbar 3 (M4) is equipped with a 22 watts x 4-channel RMS/60 watts x 4-channel Peak amplifier.

    6Ch/2.85V RCA Outputs: The shaft-style receiver features front, rear and subwoofer 2.85-volt RCA outputs. The front and rear speaker RCA outputs are balance and fade adjustable. The subwoofer RCA output is non-fading.

    Subwoofer Control: When the subwoofer RCA output is active, you can adjust the output level (0-12) of the sub output. You can also set the low-pass crossover to 80, 120, or 160Hz.

    Equalizer: The Wonderbar 3 (M4) features the following preset EQ curves (Classic, Pop, Rock, or Off) to customize your music listening. The Off mode activates a 3-Band EQ which lets you adjust Bass, Midrange, & Treble manually.

    3-Band EQ
    Frequency Level
    Bass 60, 80, 100, 200 Hz -7 to +7
    Midrange 0.5, 1.0, 1.5, 2.5 kHz  -7 to +7
    Treble 10.0, 12.5, 15.0, 17.5 kHz -7 to +7

    XBAS: This function boosts bass & treble at low listening volumes, and should be turned off at higher listening levels.

    Balance & Fader Control: The Balance adjustment function allows you to adjust or pan the stereo sound from the left or right; this is helpful to compensate for the position of the driver in relation to the speaker locations. Adjustment range is 0 to 12. The Fader Control allows you to fade the sound from the front pair of speaker to your rear pair of speakers. Adjustment range is 0 to 12.

    Turn-On Volume: You can set the Wonderbar 3 (M4) to power-on to the same volume level (0-46) every time, or let it default to the last volume when turned off.

    Key Beep: When this function is enabled, every knob turn or button press will output a beep tone.

    Our Product Research Team

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