cantaloupe RADIO BA31 Factory+ Bluetooth Retrofit Kit Owner’s Manual

OWNER’S MANUAL
BA31 Factory+
Bluetooth Retrofit Kit
With Optional Products
Display+ Amp+
BMW CM5908
COMPATIBLE RADIO

QUICK GUIDE WITH DISPLAY+

QUICK GUIDE WITHOUT DISPLAY+

WARNINGS

WARNING
READ BEFORE INSTALLING AMP+ IN A PREMIUM-SOUND E30!
Connecting Amp+ directly to a factory-wired Premium-Sound E30 without proper adaption WILL cause damage to Amp+. The Amp+ Premium Sound Adapter Harness available with purchase MUST be installed in the vehicle PRIOR to connection of a CM5908 containing Amp+. See page 9 for more details.

CAUTION
ELECTRICAL HAZARDS
Cantaloupe Radio products must be installed by a professional. Bodily harm or harm to equipment is possible without proper attention to static electricity discharge, unintended shorting, sensitive components, and other lectrical phenomena. Contact Cantaloupe Radio for professional installation service.

GENERAL INFO

Thank you for purchasing a Factory+ Bluetooth Retrofit Kit from Cantaloupe Radio. We go to great efforts to engineer a product that lets you get the most out of your factory radio today while remaining true to its period styling. Please take a few minutes to read this manual to ensure you get the most out of your purchase.

APPLICABLE RADIO MODELS
The BA31 is designed to work with the BMW CM5908 radio.

CONTENTS
If you have opted for self-installation, begin by verifying your kit contains the following parts:

• BA31 circuit board
• (2) screws (installed on either side of the circuit board)
• Microphone with windscreen and clip
• Microphone/Aux harness
• 8-pin wiring harness

MONEY BACK GUARANTEE
We’re confident you’ll enjoy this transformation of your factory radio.
However, if you are unsatisfied with the upgrade for any reason, let us know within 30 days of purchase to arrange for a return and full refund.
LIMITED WARRANTY
Your Factory+ kit comes with a 1-year limited warranty against any defects hindering functionality. Should you experience any issues during this period, please contact us to resolve.

INSTALLATION
To make installation as painless as possible, we provide an installation video taking you step-by-step through the process. To view the video, scan the QR to the right.

http://www.cantalouperadio.com/videos/ba31install

DASHBOARD DESKTOP APPLICATION
Our desktop application, Dashboard, helps you get the most out of your Factory+ kit. With Dashboard, you can:

• Change device settings
• Update firmware for new features and improvements
• Submit diagnostics if you encounter an issue
• Reset your Factory+ kit

Dashboard is available for Mac and Windows platforms. Scan the QR to the right for more info.

http://www.cantalouperadio.com/qr/deskapp/land

COMMON OPERATION

OPTIONAL ADD-ON PRODUCTS
The BA31 has 2 optional, add-on products that can be used in conjunction with BA31 to further enhance the CM5908 radio.

• Display+: An enhanced LCD display that enables a more intuitive and extensible interface
• Amp+: An enhanced amplifier module that brings powerful Class-D amplification, subwoofer and line outputs, audio DSP, and more to the CM5908.

The BA31 can be used alone, with Display+, with Amp+, or with both Display+ and Amp+. Differences  in behavior will be called out where applicable.
SOURCE SELECTION
With the kit installed, your radio now has 3 possible audio sources: tuner (AM, FM, WB), Bluetooth, and a 3.5mm auxiliary input. To cycle through the sources, press and release the volume knob.

CONNECTING BLUETOOTH
Factory+ kits don’t require any special “pairing” mode to enter before connecting a mobile device. Instead, the kit is always ready to connect whenever a device is not already connected. To do so, open your device’s Bluetooth settings and connect to “Cantaloupe Radio BA31”.
DISCONNECT & RECONNECT
In Bluetooth mode, a long press (>1sec) on the volume knob triggers one of two actions: if a device is connected, it will be disconnected; if no device is connected, the radio will attempt to reconnect a previously-connected device.
Note this happens automatically when the radio is powered on.
PLAYBACK CONTROLS
In Bluetooth mode, playback can be controlled from the radio using the 4-way directional button and the 2/PROG button:

• Play/Pause – 2/PROG
•  Next Track – UP
• Previous Track – DOWN
• Rewind – LEFT
• Fast-Forward – RIGHT

Note that depending on the currently-playing application on the mobile device, Rewind/Fast-Forward may behave differently (continuous scrub vs. skip ahead/back) or not be supported.

COMMON OPERATION AND OEM DISPLAY

VOICE ASSISTANT Your mobile device’s voice assistant can be invoked directly from the radio by pressing the 1/EJ button in Bluetooth mode. After a short delay, your assistant’s chime will play to indicate it is now listening for your command. Say your command and the assistant will respond. To dismiss the assistant at any time, press the 1/EJ button again.
CALL HANDLING
When an incoming phone call is ringing, you can answer the call by press- ing the 2/PROG button. To reject an incoming call, press the 1/EJ button. During a call, it can be ended by pressing the 2/PROG button again. AUTOMATIC SOURCE SWITCH FOR CALLS
To ensure an incoming call is not missed, the radio will automatically switch to Bluetooth if a call comes in while another source is selected. When the call is ended, rejected, or missed, the radio will return to the previously selected source.
OEM DISPLAY
When using the BA31 with the original radio LCD display, a limited amount of feedback is shown on screen and described below:
TUNER
Tuner operation and display works identically to original.

BLUETOOTH
In Bluetooth mode, the MTL indicator in the display shows the Bluetooth connection state:
Blinking: Disconnected
On: Connected
The display will show either a “1” or “2” depending on the playback state:

1. Playing
2. Paused

AUX
In aux mode, the MTL indicator will be off and a “1” will always be shown.

DOLBY ® NOISE REDUCTION

When using the OEM display, It is still possible to engage Dolby Noise Reduction in Bluetooth and aux mode. However, this should NOT be enabled as it causes decreased audio clarity.
It is disabled by  default, but if a icon is shown on the display, press the 3 button to disable it.

DISPLAY+ OPERATION & SETTINGS

The next sections describe functionality with the Display+ module installed in place of the OEM display.
TUNER
When the tuner source is selected, the radio operates identically to original with a slightly reorganized display.

DISPLAY MODES
There are 3 display modes to choose from to suit your visual appetite. This selection affects the display appearance during Bluetooth and aux use.
To cycle through display modes, press the 5 button while in Bluetooth or aux mode.

In Rich mode, the track title & artist will scroll once when changed and can be scrolled at any time by pressing the 6 button. The playback status is shown in the lower left corner.
In Minimal mode, only the playback status is shown in the center, with connection status shown in the lower left.
In Spectrum mode, a 14-band real-time audio spectrum view is shown in the main area with playback status in the lower left.
SETTINGS
While in Bluetooth or aux mode, press the BAND button to bring up the settings menu. Use the 4-way direction button to navigate the menu. UP & DOWN move through possible categories, settings, and values, while LEFT & RIGHT drill into or out of a category or setting. Settings navigation and descriptions are given below.
DISABLE HANDS-FREE CALLING
BAND > Setting > General > Disable Hands-Free Calling For a completely factory look, you may prefer to not install the clip-on microphone in the vehicle. If so, disable this setting so the radio does not interfere with phone calls or voice assistant on the mobile device. A power cycle of the radio is required for this to take effect.

DISPLAY+ ABOUT & UTILITIES

LEFT/RIGHT SEEK
BAND > Setting > General > Remap RWD/FF to Prev/Next
Given the less common usage of Rewind and Fast-Forward, enabling this setting allows you to instead use LEFT for previous track and RIGHT for next track.
DISPLAY BRIGHTNESS
BAND > Setting > Display > Brightness
The brightness of Display+ can be adjusted from 1-10. Note Display+ au- to- dims when dash illumination is turned on.
ABOUT
BAND > About > Serial#
BAND > About > FW Vers
BAND > About > Model
The About section provides pieces of static info about the product such as model, serial number, and firmware version.
UTILITIES
A few miscellaneous system utility functions are also available under the “Utility” menu of settings.

FACTORY RESET
BAND > Utility > Factory Reset
Executing a factory reset causes the device to return to its factory shipping state.
This includes the following changes:

• Reset of all device settings to default values
• Deletion of all Bluetooth device pairings
• Deletion of any diagnostics logs stored on device

After selecting this utility, you must confirm intent to factory reset the device by following on-screen instructions, then power cycle the radio to reconnect.
DISPLAY TEST
BAND > Utility > Display Test
This allows you to test your Display+ unit. Upon entering this utility, all LCD dots are turned on. Exit the utility by pressing LEFT.
LED TEST
BAND > Utility > LED Test
This utility turns on all LEDs on the front face of the radio to test hardware functionality.
This includes a green LED behind number buttons1-6 as well as the LED bar above the IR slider.
In this bar, there should be 8 amber dots lit on each side of the green center dot.
Note this utility is only available with Amp+ installed.

AMP+

The remaining sections of the manual cover additional functionality and features enabled with the Cantaloupe Radio CM5908 Amp+ kit installed in the radio.

INSTALLATION
Amp+ installation takes place in 2 parts: radio-installation and vehicle- installation.
Radio-installation consists of replacing the OEM amplifier assembly inside the radio with our Amp+ assembly.
This portion of the install is a radio-send-in service we perform at our facility.
The second part is the vehicle installation, where the end user or shop reinstalls the modified radio in the vehicle. This part we’ll cover next.
Before continuing with this portion on the install, ALWAYS disconnect the vehicle battery.
PACKAGE CONTENTS
When your modified radio is returned, you’ll receive the following in your package related to Amp+:

• Your CM5908 radio with Amp+ installed
• Amp+ wiring harness
• BMW “Premium Sound” adapter harness (if ordered)

The diagram on the following page shows the new connection points on the rear of the radio with Amp+ installed.

PREMIUM SOUND ADAPTER

If your E30 was equipped with the “Premium Sound” option that included the trunk-mounted booster amp, the trunk amp MUST be bypassed to function properly and avoid damaging Amp+. Additionally, premium sound cars were wired in such a way that there was only 1 wire per speaker connected to the back of the radio with a shared ground between all speakers (as opposed to a more conventional +/- pair per speaker). This also MUST be converted to a standard 2-wire-per- speaker setup for Amp+ operation. The optional Premium Sound Amp+ adapter harness we offer takes care of both of these. Follow the instructions included with the adapter harness to perform this step BEFORE proceeding.

HARNESS INSTALL
The Amp+ harness is designed to be as plug-n-play as possible when installing in an E30. The diagram on page 11 shows the various connections to be made between the Amp+ harness and the vehicle chassis harness:

• 2-pin 12V IGN / GND plug
• 2-pin ILLUMINATION / MEMORY plug (note the MEMORY wire is in- tentionally absent from this plug in the Amp+ harness)
• 1-pin POWER ANTENNA plug
• (4) 2-pin speaker plugs

Additionally, the 4 main speaker line level RCA outputs and a 3.5mm stereo line-level aux input jack are in the harness for appropriate audio con- nections. See page 12 for 12V CONSTANT power wire installation.

AMP+ REAR PANEL

1. Main Harness Connector: The main Amp+ harness carries all power wires, speaker outputs, main speaker RCA line outputs, aux input, and remote amp turn-on wire.
2. Subwoofer RCA Line Output: A dedicated, mono subwoofer output on the rear allows connection to an external subwoofer amp.
3. 3.5mm Microphone Input: Attachment for included microphone used during hands-free calling and voice assistance
4. CD Changer DIN Connector: The factory DIN connector for the op- tional CD changer remains available on the rear panel and fully func- tional.
5. Antenna Connector: The connection point for the vehicle antenna remains unchanged from factory.
6. Factory Calibration Port: From the factory, a small RF connector extended through this hole in the heat sink to allow for factory tuner calibration. The connector has no use to the end-user and must be removed during Amp+ radio installation. The hole will now be empty.

AMP+ HARNESS CONNECTIONS

AMP+ INSTALLATION

CHASSIS HARNESS DIFFERENCES
The diagram at left shows the wire functions and connections to be made between the Amp+ harness and the chassis harness. With the E30’s long production run and various sound options, this is not a one-size fits all diagram. Shown here is an example late-model chassis harness without the premium sound option. Please consult BMW wiring diagrams to match up functionality to your specific car’s wiring, or contact Cantaloupe Radio if you are unsure.
As mentioned, you MUST use an Amp+ Premium Sound adapter harness if any of your chassis speaker plugs have only 1-wire connected and/or yourcar has a factory trunk-mounted amp.

12V CONSTANT WIRE
The high power of Amp+ requires additional current beyond what the factory radio power wiring can supply. Additional power is sourced by teeing into the cigarette lighter circuit. The Amp+ harness makes this plug-nplay for E30s. Follow the steps below:

1. Remove the cigarette lighter trim assembly from the lower dash to gain access to the rear of the cigarette lighter.
2. Run the long yellow wire of the Amp+ harness down the left side of the center control stack to the cigarette lighter. You’ll likely need to loosen the lower dash trim in this area to snake the wire down.
3. Disconnect the positive terminal (yellow/red wire) from the back of the cigarette lighter.
4. Connect the right-angle female spade terminal from the yellow wire of the Amp+ harness to the back of the cigarette lighter.
5. Insert the male spade terminal from the yellow wire of the Amp+ harness into the positive terminal removed from the cigarette lighter in step3.
6. Reinstall trim

AMP TURN-ON
The Amp+ harness features a remote amp turn-on wire. This wire should be connected to the REMOTE input of any external amplifiers used. From the factory, the Amp+ harness has a heat-shrink cap over this wire. If not using an external amp, leave as-is, otherwise cut the capped end off to add your connection of choice.

AMP+ SETTINGS

The remaining sections cover radio functionality with Amp+ installed.
SETTINGS
Several additional audio configuration & DSP settings become available with Amp+ installed. As with other settings, adjustment of these settings can be performed on-screen if Display+ is installed, or via the Dashboard app in either case. These settings’ navigation and descriptions are covered next.

OUTPUT LOCATION
BAND > Setting > Audio > Output Location
This setting allows the user to chose where the 4 main speaker outputs are sent. By default, this is set to Speaker. In this case, speaker-level outputs are sent to the harness speaker wires. If you’ll be using Amp+ with an external 4-channel amp for the main speakers, you’ll need to change this to Line, which configures 4V RMS (max) signals to be sent out the front & rear stereo RCA jacks in the harness. Note that a power cycle of the radio is required after changing this setting to take effect.
Also note that the subwoofer RCA line out is always enabled regardless of this setting.

FADER / BALANCE
BAND > Setting > Audio > Fader
BAND > Setting > Audio > Balance
Standard fader and balance controls can be edited in settings to position the sound in the vehicle.

SUBWOOFER LEVEL BAND

Setting > Audio > Subwoofer > Level
The output strength of the subwoofer line out signal can be adjusted from -24 dB to 0 dB. 0 dB corresponds to a 4V RMS (max) output level. The setting defaults to -12 dB. We recommend adjusting the input gain on your subwoofer amp to your nominal desired volume with this default -12 dB output level to allow fine tuning the level from the radio menu as content or driving conditions change.

SUBWOOFER LEVEL BAND
> Setting > Audio > Subwoofer > Level
The output strength of the subwoofer line out signal can be adjusted from -24 dB to 0 dB. 0 dB corresponds to a 4V RMS (max) output level. The setting defaults to -12 dB. We recommend adjusting the input gain on your subwoofer amp to your nominal desired volume with this default -12 dB output level to allow fine tuning the level from the radio menu as content or driving conditions change.

CROSSOVER FREQUENCY
BAND > Setting > Audio > Subwoofer > Crossover Frequency
This sets the crossover frequency for the optional subwoofer low-pass filter as well as the optional main-speaker high-pass filter. Crossovers are implemented as 4th order Linkwitz-Riley filters.

SUBWOOFER LOW-PASS ENABLE
BAND > Setting > Audio > Subwoofer > Sub Low-Pass Enable
Enabling this setting turns on the low-pass filter applied to the subwoofer line out signal according to chosen crossover frequency above.

SPEAKER HIGH-PASS ENABLE
BAND > Setting > Audio > Subwoofer > Speaker High-Pass Enable
Enabling this setting turns on the high-pass filter applied to the 4 main speaker output signals according to the chosen crossover frequency. In practice, this should only be enabled when a subwoofer is installed.

5-BAND EQUALIZER
BAND > Setting > Audio > EQ
A 5-band parametric equalizer is available to further tailor the sound to the vehicle. EQ controls are described next.

BASS
BAND > Setting > Audio > EQ > Bass > Gain
BAND > Setting > Audio > EQ > Bass > Corner Frequency
This low-shelf filter can be used to boost or cut bass frequencies according to the selected corner frequency and gain.

LOW-MID / MID / MID-HI
BAND > Setting > Audio > EQ > [band] > Gain
BAND > Setting > Audio > EQ > [band] > Center Frequency
These 3 middle filter bands allow you to boost or cut around a configurable center frequency.

TREBLE
BAND > Setting > Audio > EQ > High > Gain
BAND > Setting > Audio > EQ > High > Corner Frequency
This high-shelf filter can be used to boost or cut treble frequencies according to the selected corner frequency and gain.

ANTENNA UP CONDITION
BAND > Setting > General > Antenna Up Condition
This setting allows you to control when the power antenna is raised. This defaults to Powr On for factory-like behavior where the antenna is raised whenever the radio is powered on. Change this to Tuner to only raise the antenna when listening to the tuner specifically.

SLIDER AUDIO MENU
The radio’s IR slider can be used to adjust a common subset of previously mentioned audio settings. Like the factory behavior, bring a finger to the IR slider or press the MODE button to pull up this menu. Short press MODE to cycle to the next setting, long-press MODE to reset all audio EQ controls to default. Additional settings are available in this menu compared to factory.
Each setting’s on-screen text and its mapped setting are given below:

© 2024 Cantaloupe Radio LLC
Brooklyn, NY
Cantaloupe Radio is not affiliated with or endorsed by BMW
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