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RetroSound RetroRadio M4HD Digital media receiver for classic cars — does not play discs (Black Face/Black Buttons)

Item # 068LONGBB

When I venture to classic car shows, I marvel at all the vintage rides.

Find what Fits your vehicle


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When I venture to classic car shows, I marvel at all the vintage rides.

19 questions - 30 answers

Item # 068LONGBB

Other options

About the RetroSound RetroRadio M4HD

Dave Delamere

Modern features, the look of yesteryear

When I venture to classic car shows, I marvel at all the vintage rides. But, I often cringe at the less-than-optimal audio systems that owners try to work into their vehicles. RetroSound came up with a solution for drivers who want to show off the inside of their baby just as much as the outside. Their Long Beach digital media receiver provides modern audio features, like Bluetooth®, USB ports, and an option for satellite radio, while totally complementing the look of your vintage vehicle.

Modern features, the look of yesteryear

When I venture to classic car shows, I marvel at all the vintage rides. But, I often cringe at the less-than-optimal audio systems that owners try to work into their vehicles. RetroSound came up with a solution for drivers who want to show off the inside of their baby just as much as the outside. Their Long Beach digital media receiver provides modern audio features, like Bluetooth®, USB ports, and an option for satellite radio, while totally complementing the look of your vintage vehicle.

Lots of ways to listen

The Long Beach allows you to talk hands-free or stream audio programming to the receiver with your smartphone, and you can connect your iPhone 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.

HD Radio

Enjoy your radio faves

You can stream your favorite music apps using the built-in Bluetooth. And 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 to enjoy satellite radio's deep programming from coast to coast. The Long Beach also lets you enjoy HD Radio® from participating stations, so you'll hear FM that's close to CD quality or AM that comes in clear and static-free. And most participating stations send out secondary programming, giving you more choices when you're in the mood for radio. And if you're not in an area with HD Radio stations, don't worry — this radio's sensitive tuner picks up local analog stations like a pro.

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. RetroSound's Infinimount mounting system lets you adjust the spacing of the control shafts, so this receiver can fit in a variety of cars and trucks. 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.

Adapt the Long Beach to a DIN opening

If your classic car has already been altered to accept a DIN (2" tall) radio, we offer a repair kit to convert your dash opening back to its original splendor!

This digital media receiver will not play discs.


Product highlights:

General features:
  • digital media receiver with black and chrome control face designed for classic cars (no built-in CD player)
  • black bezel, black buttons
  • built-in amplifier (25 watts RMS/45 peak x 4 channels)
  • built-in Bluetooth for hands-free calling and audio streaming
  • built-in HD Radio tuner
  • plays MP3 and WMA music files from external sources (no internal CD player)
  • InfiniMount shaft/bracket system fits most car dash openings
  • LCD display with 32,000 backlight color choices
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
  • compatible with SiriusXM's aftermarket satellite radio tuner (sold separately, subscription required)
  • 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 info:
  • warranty: 2 years
  • MFR # LB-M4

What's in the box:

  • Shaft-style radio (M4HD body)
  • Front-panel
  • 2 Infinimount shafts (with 11" harness attached to each one)
  • 2 Infinimount metal brackets
  • Main harness
  • Power/Ground harness
  • Speaker harness
  • Microphone w/ bracket (attached 8'cable terminated by a mono-male 3.5mm connector)
  • 10 Large machines screws
  • 4 Small machine screws
  • 12 Large hex-nuts
  • Medium hex-nut
  • 4 Small hex-nuts
  • 3 Lock-washers
  • 8 Large flat-washers
  • 8 Small flat-washers
  • 2 Large spacers
  • 2 Small spacers
  • Large self-tapping screw
  • Small self-tapping screws
  • Rear-support stud
  • Backstrap
  • Rubber boot
  • User's Manual
  • Quick Start Guide
  • "STOP" note

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More details on the RetroSound RetroRadio M4HD

Stacey B.
The RetroSound RetroRadio M4HD replaces these items:

Product Research

Shaft-Style Radio
Built-In Bluetooth
USB/iPhone/Aux Integration
HD Radio + SiriusXM Ready
Audio Section

Shaft-Style Radio

Floating Front-Panel + Infinimount Shaft/Bracket System: The RetroSound Long Beach (M4HD)'s floating front-panel and infinimount shaft/bracket system allows you to mount the radio in a variety of other classic cars and hot rods. This is because the front-panel and shaft-knobs are not mounted to the radio's chassis-body, but instead connect to the chassis via harnesses; allowing the front-panel to be mounted remotely from the chassis and customizing the location of the shaft knobs. 

  • Separate Faceplate & Chassis: Unlike most shaft-style radios, the front-panel is separate from the chassis-body and can be mounted remotely or attached to the front of the chassis via four screws. The front-panel plugs into the chassis-body via a proprietary 5" harness. Mounting the front-panel in a separate location from the chassis requires an optional extension harness (sold separately). The front-panel measures 3.5625" (w) x 1.5625" (h) x 1.5625" (d). The chassis-body measures 4.125" (w) x 2.005" (h) x 4.75" (d).
  • Adjustable Shaft Knobs: The shaft knobs are not affixed to the radio either, instead the connect to chassis via two harness. You can space the radio's shaft knobs at various distances (0.3125"-2.1875") from the chassis of the radio, using the supplied side-mount brackets. You can move these brackets forward or backward and move them in any direction. You can even cut, trim, or bend the brackets if needed.
Note: This shaft-style radio is a true problem solver for tough to fit applications due to its unique front-panel and bracket system combined with its small chassis size.

Faceplates & Knobs (sold separately): There are multiple vehicle specific faceplates & knobs available for the Long Beach (M4HD). In addition there are universal faceplates which allow you to use the integrated break away tabs to modify all aspects of height & width of the plate, and even drill in your own shaft holes to fit virtually any car.

Note: The RetroSound Longbeach does not come with a faceplate or knobs. A universal mounting plate or vehicle specific faceplate and knob set will be needed for installation.

Variable-Color LCD: The RetroSound Long Beach (M4HD) 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 from High, Medium, or Low. The LCD will display clock, audio settings, tuner stations, and song/artist information from USB and iPod/iPhone devices.

Five Style Options: The Long Beach (M4HD) is available in five style configurations.

  • Chrome with chrome push-buttons
  • Chrome with black push-buttons
  • Chrome with ivory push-buttons
  • Black with black push-buttons
  • Black with chrome push-buttons
Built-In Bluetooth

Bluetooth Technology: The RetroSound Long Beach (M4HD) is equipped with built-in Bluetooth 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. The Long Beach (M4HD) is compatible with most Bluetooth enabled mobile phones, including the Apple iPhone & Android smartphones.

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 Long Beach (M4HD).

Pairing: Before using your Bluetooth enabled device, it must be paired to the Long Beach (M4HD). 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.

Hands-Free Communication (HFP): The Long Beach (M4HD) 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 (AD2P/AVRCP): The Long Beach (M4HD) 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.

USB/iPhone/Aux Integration

Dual USB Ports: The RetroSound Long Beach (M4HD) features two USB (type-A) ports connected to its rear chassis by a 20" 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 Long Beach (M4HD) 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 Long Beach (M4HD) 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.
  • Not compatible with Android mobile devices.
  • You cannot connect a USB device via a USB hub or Multi-Card Reader to this unit.

iPod/iPhone Direct Connect: Either rear-panel USB port can act as an iPod/iPhone high-speed direct connection. The RetroSound Long Beach (M4HD) supports audio playback of stored music or music apps, music navigation, information display, and charging of select iPod/iPhone models.

  • 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).
  • Display: The Long Beach (M4HD) 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.
  • 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: The Long Beach (M4HD) supports select iPod and iPhone models (not compatible with iPad).

  • Full Size: Classic (all generations)
  • Nano: 3rd Generation and newer
  • Touch: 2nd Generation and newer
  • iPhone: 3G and newer
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.

HD Radio + SiriusXM Ready

HD Radio: The Retrosound digital media receiver features a built-in HD Radio, plus an RDS AM/FM tuner. HD Radio technology gives you access to crystal clear HD Radio broadcasing in your area. HD Radio and the 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 Long Beach (M4HD) is SiriusXM-Ready and connects to the SiriusXM SXV300 Connect Vehicle Tuner (220SXV300, sold separately). The SXV300 plugs directly into the Long Beach (M4HD) 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

MOSFET Amplifier: The Long Beach (M4HD) is equipped with a 25 watts x 4-channel (RMS)/45 watts x 4-channel (Peak) MOSFET amplifier.

6Ch/2.85V RCA Outputs: The universal 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 Long Beach (M4HD) 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 Long Beach (M4HD) 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.

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Customer Q&A

19 questions already asked

Can I use the original knobs (volume & tuner) and escutcheons (balance & fade) for my 1972 Buick Riviera?
david  Feb 20, 2023
1 answer
It's possible they may match up David, but I cannot confirm. You will have the option of new, as with any Retrosound radio purchase with Crutchfield you get a free faceplate and knob selection as a bonus add-on. The 03-73 knob kit in the link below is visually the closest I can see to the factory Buick, and you can also switch up the color or style if you choose.
bo  Feb 21, 2023 (Staff)
Does it stream music podcasts from iPhone directly, no added equipment?
jeff  Jun 20, 2022
1 answer
Greetings Jeff, and thank you for your question. The Retrosound Long Beach has built in Bluetooth for both hands free calling, as well as streaming from your Bluetooth connected phone. Podcast, music, and more.
hogan  Jun 21, 2022 (Staff)
Will the unit connect directly to the OEM wiring harness, or do I need an adapter? I have a 1966 Mustang Coupe.
rick  Mar 25, 2024
1 answer
A wiring harness is not available for your classic 66 Mustang coupe, the RetroSound M4HD radio will need to be spliced into your factory wiring for install, Rick.
bo  Mar 26, 2024 (Staff)
Does this unit have a power antenna lead?
jimmy  Sep 19, 2023
1 answer
Greetings James. Thank you for your question. Yes, pin 4 has a solid blue wire to trigger a power antenna. It also has a Blue/white wire to trigger on/off an external amplifier.
hogan  Sep 19, 2023 (Staff)
Can it plug in a USB MP3 flash drive & play audio without a separate player?
ross  Aug 06, 2023
1 answer
You sure can plug a USB flash drive loaded with MP3 files into this receiver and play them. Its USB input supports MP3 (128 kbps +), WMA (64 kbps +), and FLAC music files in format FAT and FAT32.
jason  Aug 06, 2023 (Staff)
Can you get a chrome faceplate for this?
brett  Nov 02, 2022
1 answer
We do have compatible chrome faceplates, many of which are vehicle specific. If you give us a call at 800.324.9695 one of our advisors should be able to tell you what options we have available!
arielle  Nov 03, 2022 (Staff)
frequency response is 30 - 16k hrz. I want to get down to 20 hrz and up to 20 k hrz. could I do this with an external bluetooth receiver like JL Audio MTB RX, in the aux line?
kolazinski  Jan 20, 2022
1 answer
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
kenneth  Jan 24, 2022 (Staff)
Is this android compactable for blue tooth or only I phones?
curtis  Jul 27, 2021
3 answers
I use Android. Works just fine.
scott  Jul 28, 2021
This product is also compatible with Android phones.
susan  Jul 27, 2021
It has Bluetooth, also you can use an Android usb charger it plugs in at the back of the unit.
daniel  Jul 27, 2021
Looking for a antenna ?
corregidor  Feb 18, 2020
2 answers
Get an electronic one. It is amplified and you can put it under the dash.
anthony j  Mar 03, 2020
Not sure what your asking. I do not need an antenna, but if you if you need one, any antenna will work. Just follow instructions on how to install it.
glenn  Feb 18, 2020
Will the nobs look like my originals (068LONGBC ) 1964 Corvette ??
john  Jun 17, 2018
3 answers
It looks like we have one set of shaft knobs for a 1964 Corvette. You can see them here: My Bio:
jason  Jun 24, 2018 (Staff)
You can choose the knobs you want when you checkout. They offer several styles.
michael  Jun 24, 2018
even better like new
ricky  Jun 24, 2018
Can you hook up a cd player to this radio?
phil  Jul 21, 2020
1 answer
The owner's manual only shows it can play a 'portable CD' player - done through the AUX 1 or AUX 2 input cables.
stephen  Jul 24, 2020
Do I need an amp for a sub or does it wire directly?
jonrossjan  Sep 20, 2018
2 answers
To power a subwoofer you'll need an amp.
rod  Sep 22, 2018
It will wire directly to factory speakers, but if you want to hook up a sub or higher powered speakers, you will need an amp.
bradley  Sep 22, 2018
Does it have balance, fader control and tone control?
milton  Apr 15, 2018
5 answers
Yes. Considering it only has 25w/ch I think it sound pretty good. Also have enjoyed the Bluetooth capability.
thomas  May 02, 2018
robert  May 01, 2018
Milton my unit does have balance, fader control also preset equalizer hope this helps
steve  May 01, 2018
Those, and much more... Tone control frequency centers are great too...
michael  May 01, 2018
brian  May 01, 2018
Will the Long Beach Unit play Apple Lossless audio file (m4a) from an iPod/iPhone?
gus  Feb 26, 2023
1 answer
This radio only supports playback of MP3, WMA, and FLAC files.
zachary  Feb 26, 2023 (Staff)
66 Mustang coupe can someone please tell me the complete list of items for a great sounding clear tone Sirius , gps, Bluetooth system including amps and tweeters subwoofer and the RetroSound unit. And average cost?
al  Dec 25, 2020
1 answer
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
thomas  Jan 12, 2021 (Staff)
Hello, I see the shaft spacing is very adjustable, but what is the cut out size (length and width) of the center section? Thanks.
david  May 08, 2020
2 answers
It fits in a standard single DIN size. The specs are available in the User Manual on the Retrosound website. Page 39 if I am not mistaken.
daniel  May 28, 2020
The length is 3 1/2. And the width is 1 1/2
don  May 27, 2020
How does it compare to the custom auto sound 740.?
ross  Feb 28, 2020
1 answer
I can't answer that particular question but I can tell you that I am very pleased with my RetroSound radio. It was installed in a 1985 C10 and the it sounds great and works as it should. I have another project getting to the point of needing audio and I will definitely be using this product again!
steven  Feb 28, 2020

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RetroSound RetroRadio M4HD SXM

RetroSound RetroRadio M4HD SXM

Digital media receiver and SiriusXM satellite radio tuner for classic cars — does not play discs
Black Face/Black Buttons
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Digital media receiver

The RetroSound RetroRadio M4HD SXM offers these features:
  • includes SiriusXM SXV300V1 tuner (satellite radio subscription required)
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