How to Wire the B65N Marine Accessory
By BOSS Audio Systems | Life at Full Volume | Published: 2026-10-30
Category: How-to Guides
Learn how to correctly wire the BOSS Audio Systems B65N high-to-low level converter in your boat for clean audio signal integration.
Quick answer
Wire the B65N by connecting its high-level inputs to your marine receiver's speaker outputs and its low-level outputs to your amplifier's RCA inputs, then adjust the input sensitivity to match your system.
Why Use a Line Output Converter in a Marine Setup?
Many marine amplifiers accept only low-level RCA signals, while older or basic marine receivers only output high-level speaker signals. The B65N bridges that gap, converting speaker-level signals to pre-amp level without degrading audio quality.
Because marine environments add corrosion and moisture risks, using a dedicated converter like the B65N keeps connections cleaner and more reliable than splicing into factory wiring.
Wiring Steps
- Disconnect the battery: Disconnect the negative terminal of your boat's battery to prevent shorts or accidental power-on while wiring. Always disconnect power before starting any marine electrical work.
- Mount the B65N securely: Choose a dry, ventilated location near your receiver or amplifier. Use the mounting tabs to secure the converter. Avoid areas exposed to bilge water or direct spray. A common mistake is mounting it in a damp spot—moisture can short the circuit.
- Connect the high-level inputs: Strip and connect the B65N's input wires to the speaker outputs of your marine receiver. Match polarity: positive to positive, negative to negative. Use crimp connectors or solder for a weather-resistant joint. Reversing polarity on one channel can cause phase cancellation and weak bass.
- Connect the low-level outputs: Plug the RCA cables from the B65N's output jacks into your amplifier's RCA inputs. Use marine-grade RCA cables with corrosion-resistant connectors. Loose RCA connections cause intermittent signal dropouts—ensure they click securely.
- Adjust input sensitivity: With the system playing at a moderate volume, turn the B65N's sensitivity dial until you hear clear sound without distortion. Start at minimum and increase slowly. Turning the sensitivity too high introduces distortion; too low leaves your amplifier underpowered.
- Test and secure wiring: Reconnect the battery and test the system at various volume levels. Verify all channels work and there's no engine noise. Use zip ties to bundle and secure loose wires away from moving parts. Loose wires can chafe against metal edges and cause shorts—tuck them neatly.
Product Facts
- B65N: The B65N features input sensitivity adjustment for fine-tuning signal levels. This lets you match the converter's output to your amplifier's input range, preventing distortion or weak signal.
B65N
