Bluetooth adapter Audison B-Con II Trunk B+ GND Bluetooth
Optical
Build showcase
Selected photos from this build. Open an image for full size.Photos of this build.
Description
CarSQ is an actively amplified sound-quality system built into a Renault Megane E-Tech while retaining the factory interior, infotainment system, and everyday usability of the car.
The system combines dedicated door mid-bass drivers, sealed wideband speakers in custom sail-panel enclosures, a front-mounted subwoofer, and a separate trunk subwoofer. Signal processing, amplification, crossover design, time alignment, and equalization are handled through a fully active DSP-based setup.
This is not a finished one-time installation, but an evolving long-term project. The build documents the complete development process: OEM integration, custom fabrication, driver testing, acoustic measurements, tuning experiments, competition results, problems, failed ideas, and later system revisions. The goal is to achieve accurate tonality, a stable front soundstage, strong low-frequency integration, and high output without sacrificing the practicality of the vehicle.
Measurements
8 filesCompare uploaded measurements across the full system and individual channels.Compare measurement traces.
Measurement setup
Equipment and conditions used for these measurements.
- Date
- Environment
- Car interior
- Position
- Driver seat
- Microphone
- miniDSP UMIK-1
- Calibration
- Individual calibration file
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
Measurement details Log sweep · REW
- Method
- Log sweep
- Software
- REW
- Export processing
- 1/48 octave
Measurement details RTA · Moving microphone · Pink noise, periodic (PN) · REW
- Method
- RTA · Moving microphone
- Signal
- Pink noise, periodic (PN)
- Software
- REW
- FFT length
- 64k
- Averages
- 100
- Export processing
- 1/48 octave
System diagram
15 nodes 19 connectionsSignal and power routing, as wired. Open a node for the part behind it.How signal and power are routed.
Bluetooth adapter Audison B-Con II Trunk 
Phone / tablet Google Pixel 8 Pro Middle console Phone holder Bluetooth
Subwoofer JL Audio 6W3v3-4 Front subwoofer SPK IN
Multi-channel DSP amplifier JL Audio VX700/5I Trunk B+ GND Optical S/PDIF · S/PDIF
1 2 3 4 SUB OUT PRE OUT 1
Full-range driver One Audio WB3.e Right Sail Panel SPK IN
Full-range driver One Audio WB3.e Left Sail Panel SPK IN
Other speaker driver JL Audio C3-650 Left Door SPK IN
Other speaker driver JL Audio C3-650 Right Door SPK IN
Passive subwoofer Jl Audio CS112LG-TW3 Trunk Subwoofer SPK IN
Distribution block HIMOZEAN Mini ANL Fuse Holder Trunk PWR IN
160 A 260 A 320 A
Mono amplifier JL Audio RD500/1 Trunk B+ GND RCA 1
SPK OUT
GND
PWR OUT GRN
Fuse holder Eton PCC 20 PWR IN
160 A
Distribution block HIMOZEAN Mini ANL Fuse Holder PWR IN
1 2 3
Audison B-Con II
Part details
- Manufacturer
- Audison
- Model
- B-Con II
Key specifications
- Active or passive
- Active
Diagram ports
- B+Input
- GNDInput
- BluetoothInput
- OpticalOutput
Google Pixel 8 Pro
Part details
- Manufacturer
- Model
- Pixel 8 Pro
Key specifications
- Supported audio formats
- MP3, FLAC
- Streaming protocols
- Tidal Connect, Bluetooth
- Bluetooth version
- Bluetooth 5.2
- Network connections
- Wi-Fi
Diagram ports
- BluetoothOutput
JL Audio 6W3v3-4
Part details
- Manufacturer
- JL Audio
- Model
- 6W3v3-4
Key specifications
- Nominal size
- 16.5 cm
- Nominal impedance
- 4 Ω
Diagram ports
- SPK INInput
JL Audio VX700/5I
Part details
- Manufacturer
- JL Audio
- Model
- VX700/5I
Key specifications
- Amplifier class
- Other
- DSP sample rate
- 192002 kHz
- DSP bit depth
- 24 bit
Diagram ports
- SPK OUT 1Output
- SPK OUT 2Output
- SPK OUT 3Output
- SPK OUT 4Output
- SUB OUTOutput
- B+Input
- GNDInput
- PRE OUT 1Output
- Optical S/PDIF · S/PDIFInput
One Audio WB3.e
Part details
- Manufacturer
- One Audio
- Model
- WB3.e
In this build
- Quantity
- 2
Key specifications
- Linear excursion, Xmax
- 4.1 mm
- Resonant frequency, Fs
- 147 Hz
Diagram ports
- SPK INInput
One Audio WB3.e
Part details
- Manufacturer
- One Audio
- Model
- WB3.e
In this build
- Quantity
- 2
Key specifications
- Linear excursion, Xmax
- 4.1 mm
- Resonant frequency, Fs
- 147 Hz
Diagram ports
- SPK INInput
JL Audio C3-650
Part details
- Manufacturer
- JL Audio
- Model
- C3-650
In this build
- Quantity
- 2
Key specifications
- Nominal size
- 16.5 cm
- Nominal impedance
- 4 Ω
Diagram ports
- SPK INInput
JL Audio C3-650
Part details
- Manufacturer
- JL Audio
- Model
- C3-650
In this build
- Quantity
- 2
Key specifications
- Nominal size
- 16.5 cm
- Nominal impedance
- 4 Ω
Diagram ports
- SPK INInput
Jl Audio CS112LG-TW3
Part details
- Manufacturer
- JL Audio
- Model
- CS112LG-TW3
Key specifications
- Enclosure type
- Sealed
- Nominal impedance
- 2 Ω
Diagram ports
- SPK INInput
HIMOZEAN Mini ANL Fuse Holder
Part details
- Manufacturer
- HIMOZEAN
- Model
- Mini ANL Fuse Holder
In this build
- Quantity
- 2
Key specifications
- Input count
- 1
- Output count
- 3
- Number of fuse slots
- 3
- Negative or positive distribution
- Both
Installed fuses
- Fuse 2
- 60 A
- Fuse 3
- 20 A
- Fuse 1
- 60 A
Diagram ports
- PWR INInput
- FUSE OUT 1 · 60 AOutput
- FUSE OUT 2 · 60 AOutput
- FUSE OUT 3 · 20 AOutput
JL Audio RD500/1
Part details
- Manufacturer
- JL Audio
- Model
- RD500/1
Diagram ports
- SPK OUTOutput
- B+Input
- GNDInput
- RCA 1Input
Ground
Diagram ports
- GNDBoth
Car Battery 13.5 Volt
Diagram ports
- PWR OUTOutput
- GRNOutput
Eton PCC 20
Part details
- Manufacturer
- Eton
- Model
- PCC 20
Key specifications
- Number of fuse slots
- 1
- Fuse type
- Mini ANL
Installed fuses
- Fuse 1
- 60 A
Diagram ports
- PWR INInput
- FUSE OUT 1 · 60 AOutput
HIMOZEAN Mini ANL Fuse Holder
Part details
- Manufacturer
- HIMOZEAN
- Model
- Mini ANL Fuse Holder
In this build
- Quantity
- 2
Key specifications
- Input count
- 1
- Output count
- 3
- Number of fuse slots
- 3
- Negative or positive distribution
- Both
Diagram ports
- PWR INInput
- FUSE OUT 1Output
- FUSE OUT 2Output
- FUSE OUT 3Output
Front Sub
- Source port
- SUB OUT
- Target port
- SPK IN
- Wiring
- Normal
Speaker level
- Source port
- SPK OUT 1
- Target port
- SPK IN
Speaker level
- Source port
- SPK OUT 2
- Target port
- SPK IN
Speaker level
- Source port
- SPK OUT 3
- Target port
- SPK IN
Speaker level
- Source port
- SPK OUT 4
- Target port
- SPK IN
Trunk Sub
- Source port
- SPK OUT
- Target port
- SPK IN
- Purpose
- Speaker audio
- Interface
- Bare wire
- Transmission
- Copper
- Direction
- One-way
20 mm²
- Source port
- GRN
- Target port
- GND
- Purpose
- Ground
- Interface
- Terminal
- Transmission
- Copper
- Direction
- Non-directional
- Polarity
- Ground
S/PDIF Optical IN
- Source port
- Optical
- Target port
- Optical S/PDIF · S/PDIF
- Purpose
- Digital audio
- Interface
- TOSLINK
- Transmission
- Optical
- Direction
- One-way
BT 5.2 LDAC
- Source port
- Bluetooth
- Target port
- Bluetooth
- Purpose
- Digital audio
- Interface
- Bluetooth
- Transmission
- Wireless
- Direction
- One-way
20 mm² - 15 cm
- Source port
- PWR OUT
- Target port
- PWR IN
- Purpose
- Power
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
20 mm²
- Source port
- FUSE OUT 1 · 60 A
- Target port
- PWR IN
- Purpose
- Power
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
20 mm²
- Source port
- FUSE OUT 1 · 60 A
- Target port
- B+
- Purpose
- Power
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
20 mm²
- Source port
- FUSE OUT 2 · 60 A
- Target port
- B+
- Purpose
- Power
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
5 mm²
- Source port
- FUSE OUT 3 · 20 A
- Target port
- B+
- Purpose
- Power
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
Analog audio
- Source port
- PRE OUT 1
- Target port
- RCA 1
- Purpose
- Analog audio
Ground
- Source port
- GND
- Target port
- PWR IN
- Purpose
- Ground
- Interface
- Terminal
- Transmission
- Copper
- Direction
- Non-directional
- Polarity
- Ground
Ground
- Source port
- FUSE OUT 1
- Target port
- GND
- Purpose
- Ground
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
Ground
- Source port
- FUSE OUT 2
- Target port
- GND
- Purpose
- Ground
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
Ground
- Source port
- FUSE OUT 3
- Target port
- GND
- Purpose
- Ground
- Interface
- Terminal
- Transmission
- Copper
- Direction
- One-way
- Power
- Ground
- Speaker-level audio
- Analog audio
- Digital audio
Build parts
10 unique parts 13 unitsParts used in this build. Open a part for specifications and other documented uses.Parts and their specifications.
-
Audison B-Con II
Bluetooth adapter
-
Google Pixel 8 Pro
Phone / tablet
-
JL Audio 6W3v3-4
Subwoofer
-
JL Audio VX700/5I
Multi-channel DSP amplifier
-
One Audio WB3.e
Full-range driver
-
JL Audio C3-650
Other speaker driver
-
JL Audio RD500/1
Mono amplifier
-
Jl Audio CS112LG-TW3
Passive subwoofer
-
HIMOZEAN Mini ANL Fuse Holder
Distribution block
-
Eton PCC 20
Fuse holder
Competition history
7 eventsEvents this build was entered in, and where it placed each time.Events and competition results.
FinAYAle 2026
1st place
Einsteiger 5000
Deutsches Finale 2026
EMMA Audiotec fischer
| Date | Event | Location | Class | Place | PhotosPhotos | Results |
|---|---|---|---|---|---|---|
| Audiotec Fischer AYA · Schmallenberg Einsteiger 5000 | LocationSchmallenberg | ClassEinsteiger 5000 | Place3rd | Results | ||
| EMMA Sound Off 2026 Horsch & Guck · Leipzig SQ E Unlimited | LocationLeipzig | ClassSQ E Unlimited | Place2nd | Results | ||
| ToN Hauptstadt AYA · Berlin Einsteiger | LocationBerlin | ClassEinsteiger | Place3rd | Results | ||
| FinAYAle 2025 Germany Finals · Bad Salzuflen Einsteiger | LocationBad Salzuflen | ClassEinsteiger | Place6th | Results |
Build Journal
All 9 updatesNews from the project after publishing: reworks, repairs, results.Repairs, changes, and results.
Sun
Still continuing with the sound deadening
Edited
2 days earlier
- We've been trying to figure out what's going on for over a month now; the usual ways to trick the system aren't working.
- Trying to connect stuff, the problem is - Car wont give any signal on stock sub
- Kinda insane extra work, but should be worth it
- Had to find out cables myself and create this diagram
- Here is how plan looks like
Discussion
Forum threads linked to this build, covering questions and fixes.Questions and fixes in the forum.
No linked discussions yet. Ask about this build or start a related thread.