When switching to line-level output using VCDS on a VW radio, several considerations arise regarding rear speaker integration and amplification. This article explores the options and challenges involved in this process.
Line-Level Output with VCDS and Rear Speakers
Enabling line-level output with VCDS provides a cleaner signal for an aftermarket amplifier, but raises questions about how to handle the rear speakers. Amplifying only the front channels while leaving the rear speakers connected to the head unit’s reduced signal may result in an unbalanced sound.
One option is to amplify all four channels, but this requires additional amplifier channels and careful tuning to maintain balance. Another approach is to use a line output converter (LOC) for the rear speakers, allowing them to receive a speaker-level signal while the front channels utilize the cleaner line-level output from the VCDS modification. However, this adds complexity to the installation.
Alternative Rear Speaker Configurations
Beyond traditional amplification, alternative configurations exist for rear speakers. If bass reinforcement isn’t a primary concern, the rear speakers can be configured for a “surround sound” effect, utilizing existing head unit features or aftermarket processors. This can enhance the soundstage and provide a more immersive listening experience.
Alternatively, the rear speakers can function as rear-fill, contributing to the overall soundstage and ambiance without being directly involved in bass reproduction. This can be particularly useful when a subwoofer is not installed, as the rear speakers can provide some low-frequency support.
Implementation Steps
Regardless of the chosen configuration, the installation process typically involves the following steps:
- Radio Removal: Carefully remove the factory radio from the dashboard.
- Harness Disconnection: Unplug the factory wiring harness from the radio.
- Aftermarket Harness Connection: Connect the aftermarket wiring harness, integrating any necessary adapters or converters.
- Wiring: Route RCA cables (for line-level) and speaker wires (if applicable) under the carpet to the amplifier’s location, typically under a seat.
- Amplifier Connection: Connect all wires to the amplifier, ensuring proper polarity and channel assignments.
- Power Connection: Connect the amplifier to the vehicle’s battery, using appropriate fusing and wiring gauge.
- Remote Turn-On: Program the amplifier’s remote turn-on feature to activate when the radio is powered on. This can often be achieved using a 12V trigger wire connected to the radio’s accessory power output. If a PAC TR-7 is used, it needs to be programmed for the specific vehicle.
While these steps appear straightforward, the actual installation can be time-consuming, requiring careful planning and execution. Choosing the optimal configuration for rear speakers and ensuring proper tuning are crucial for achieving a balanced and enjoyable sound system.
