


Focal Inside SPK Sim Impedance Simulator for Impulse 4.320 4 Channel Amplifier
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The Focal Inside SPK Sim is a plug-in impedance simulator designed for use with the Focal Impulse 4.320 4-channel amplifier. It maintains the correct load on your vehicle's audio system, preventing error messages when factory speaker drivers are replaced with Focal Inside speakers.
Key specifications
- Type: impedance simulator, Focal Inside
- Compatible amplifier: Focal Impulse 4.320 compact 4-channel digital amplifier
- Purpose: prevents error messages after removing factory speaker drivers
- Connectors: ISO connectors to simplify mounting
- Installation: plug-in
Impedance simulator for Impulse 4.320
When factory speaker drivers are removed and replaced with Focal Inside speakers, the vehicle's audio system can detect the change and trigger error messages. This impedance simulator plugs straight in to restore the correct load, keeping the system stable and error-free.
Inside upgrade impedance simulator
- Designed specifically for use with the Focal Impulse 4.320 4-channel amplifier
- Prevents error messages triggered by removing factory speaker drivers
- Maintains correct impedance load on the vehicle's audio system
- Ensures a clean, error-free Focal Inside speaker installation
To complete your Focal Inside install, the Impulse 4.320 system is also supported by the Focal Inside IMP Extension Cable I/O 150 and the Focal Inside Volkswagen VW Y-ISO T-Harness.
Explore the full range in Focal Wiring Looms.
Specification
| Type | Wiring |
|---|---|
| Series | Inside |
| Article Number | SPEAKER-SIM |
| Country of Manufacture | China |
More specs
| |
What's Included
- Focal Speaker Sim
Focal
About the Focal SPEAKER-SIM
From our tech experts at CEN
The Focal Inside SPK Sim is a plug-in impedance simulator for use with the Focal Impulse 4.320 amplifier. It presents the factory audio system with the load it expects once the original speakers are replaced, so the car does not show speaker error messages.
Who it suits
Owners fitting Focal Inside speakers and an Impulse 4.320 amplifier in a car whose head unit monitors the speakers and complains when they change. ISO connectors keep the install plug-in and reversible.
Our tech experts advise
Whether you need one depends on the vehicle and how its factory audio checks the speakers, so it is worth confirming before the job rather than on the day. It is made for the Impulse 4.320 installation only. Get in touch with your make, model and year and we will check.
Explore the full Focal range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Focal
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Frequently Asked Questions
Q: Why would I need the Focal SPK Sim?
A: If removing the factory speaker drivers causes your vehicle's audio system to show error messages, the SPK Sim plugs in to restore the correct impedance load and keep the system error-free.
Q: Which amplifier is the SPK Sim designed for?
A: It is designed for use with the Focal Impulse 4.320 compact 4-channel digital amplifier.
Q: How does the SPK Sim connect?
A: It uses ISO connectors to simplify mounting, so it plugs in without cutting wires.
















































