Add An Amp Amplifier Adapter Interface for Factory Toyota Scion Subaru

In this review of the Install Bay Add An Amp amplifier adapter, the bottom line is simple: this is for owners of select Toyota, Scion and Subaru models who want to add a powered subwoofer without cutting or splicing factory wiring. The adapter provides a tidy, plug and play connection at the back of the factory radio, with RCA outputs and a remote turn-on lead so a separate bass amplifier can be installed quickly. For anyone with a non-amplified factory stereo seeking a cleaner install, this adapter removes much of the typical wiring hassle.

Key Features

• Plug and play connection: connects at the back of the factory radio so no cutting or splicing into factory wiring is required, which speeds installation and preserves the OEM harness.
• RCA output: provides line-level RCA outputs to feed an aftermarket subwoofer amplifier for straightforward signal transfer.
• Remote turn-on lead: includes a power wire for the remote amplifier turn on connection so the amp powers up in sync with the vehicle stereo.
• Adjustable gain: built-in gain adjustment lets installers set output level to match the aftermarket amplifier and avoid clipping or noise.
• Non-amplified system compatibility: designed specifically for factory units without a premium external amp, ensuring proper signal extraction on supported models.

Who It's For

This adapter is aimed at DIY installers and professional shops working on compatible Toyota, Scion and Subaru vehicles that have the factory non-amplified radio. It is especially useful for drivers who want to add a subwoofer or small bass amplifier but do not want to modify the factory harness or risk warranty issues from cutting wires.

Owners of vehicles with factory amplified systems such as JBL, Bose or other external amps should look elsewhere because the adapter will not work with those setups. If a vehicle already has a premium factory amp, a different signal interface or line output converter designed for amplified systems is required.

Pros & Cons

Pros

• Easy, plug and play installation that preserves the stock wiring harness.
• Provides clean RCA outputs and a remote turn-on lead for a proper amplifier hookup.
• Good build quality and value for money based on customer feedback and straightforward functionality.
• Adjustable gain allows tuning to match aftermarket amps and prevent distortion.

Cons

• Only compatible with factory non-amplified stereos and will not work with vehicles that have a factory external amp such as JBL or Bose.
• Compatibility is vehicle specific, so buyers must confirm their model and year match the supported list.

Specifications

Brand	Install Bay
Outputs	RCA line-level outputs
Remote Turn-On	Power wire for amplifier remote
Adjustable Control	Gain adjustment
Fitment	Factory non-amplified Toyota/Scion/Subaru models (see vehicle list)
Connection Point	Back of factory radio

Our Verdict

The Install Bay Add An Amp adapter is a practical, cost-effective solution for adding a subwoofer amp to supported Toyota, Scion and Subaru models that do not have a factory external amplifier. It saves time during installation, protects the factory harness, and provides the necessary RCA and remote connections, making it a solid choice for DIYers and installers who need a clean, reliable interface.

Frequently Asked Questions

Will this work with a factory JBL or Bose system?
This adapter will not work with factory amplified systems such as JBL or Bose; it only supports non-amplified factory radios.

Where is the adapter connected?
The connection is made at the back of the factory radio using the OEM harness to avoid cutting or splicing wires.

Does it provide an amplifier remote turn-on?
Yes, the adapter includes a power wire for the remote amplifier turn on connection and also offers adjustable gain for level matching.