The ZeroNoise 6400004 is a 15 cm coiled adaptor with a male 4-pin Nexus plug at each end.
It joins two female Nexus connections. The usual case is a helmet with a female Nexus socket, such as any Bell rally intercom helmet, the Sparco Flux RJ-i or the OMP J-Rally, on an amplifier whose leads are also female. ZeroNoise catalogues it as a crossed-wiring adaptor, so the pins are arranged for exactly this join and a generic straight coupler will not do the same job.
The opposite case, two male plugs, takes the 6400005 female to female adaptor. To add length without changing gender, use the 150 cm extension.
What does this lead join?
A female Nexus socket to another female Nexus. The common use is a Bell, Sparco Flux RJ-i or OMP J-Rally helmet (female socket) on a ZeroNoise amplifier ordered with female leads. ZeroNoise wires it crossed for this job, so a generic coupler is not a substitute. Our ZeroNoise intercom compatibility guide shows every pairing.
My intercom crackles or cuts out. Is a new lead the fix?
Often, yes. Leads live a hard life being trodden on and trapped in doors, and a damaged lead is the most common cause of noise or dropouts. If a replacement does not cure it, talk to us before replacing the amplifier, as it may be a connector or helmet-kit fault instead.
