The ZeroNoise question we get most is not which amplifier is best. It is whether the helmet you already own will plug into one. In October a customer asked us whether a ZeroNoise ear cup headset would fit his Sparco Flux RJ, and most weeks someone rings with a Bell in the driver's seat and something else on the co-driver's side.
The good news is that ZeroNoise, Bell, OMP and Sparco intercom helmets nearly all use the same 4-pin Nexus plug. The catch is that the plug comes in two genders, and the amplifier leads have to be the opposite one. This page lines up every helmet and kit we sell against every ZeroNoise amplifier, and tells you which leads to order.
Look at the plug on the helmet. A female Nexus socket, which is what every Bell rally intercom helmet, the Sparco Flux RJ-i and Prime RJ-i Supercarbon and the OMP J-Rally have, needs a ZeroNoise amplifier ordered with male leads. A male Nexus plug, which is what the ZeroNoise helmet kits have, needs female leads. Stilo WRC helmets join through the Stilo AC0204.2 lead, which ends in a male plug.
The ZeroNoise Valiant is the exception. It uses 6.35 mm stereo jacks, so it only takes the Valiant headsets and helmets with a stereo plug, such as the OMP Star J Intercom.
The answer appears here.
Cameron spends more time on the word female than on anything else in intercom wiring. This is how the terms sort out.
Helmets and kits are on the left and ZeroNoise amplifiers on the right. The boxes in the middle are the plug on the helmet, and they tell you which leads to order. Dashed lines need an extra lead or a quick check with us.
Hover or tab to a helmet and its connections light up.
The map needs a wider screen. On a phone, use the checker at the top of the page or the table below, which give the same answers.
Filter by brand, and scroll sideways on a phone. M means order the amplifier with male leads, F means female leads.
| Helmet or kit | Brave | Fury | Fury Offroad | Fearless | Fearless Offroad | Pit-Link | Fearless WW | Valiant |
|---|---|---|---|---|---|---|---|---|
 Bell Mag RallyFrom £405.60 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Bell Mag-10 RallyFrom £626.40 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Bell WW (wireless)From £1509.60 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works wired and wireless | Does not work |
 Bell HP10 Rally WW (earlier)From £2812.80 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Bell GT6 RallyFrom £936.00 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Bell HP6 Carbon RallyFrom £2415.60 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Bell X-1 RallyFrom £675.60 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Sparco Flux RJ-iFrom £498.00 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Sparco Prime RJ-i 8860From £2256.00 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 OMP J-RallyFrom £336.00 | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Works: order male leads | Does not work |
 Sparco RJ-i familyFrom £668.40 | Ask us first | Ask us first | Ask us first | Ask us first | Ask us first | Ask us first | Ask us first | Does not work |
 ZeroNoise helmet kitsFrom £75.60 | Works: order female leads | Works: order female leads | Works: order female leads | Works: order female leads | Works: order female leads | Works: order female leads | Works: order female leads | Does not work |
 Stilo WRC helmetsFrom £409.20 | Works with the Stilo AC0204.2 lead and female leads | Works with the Stilo AC0204.2 lead and female leads | Works with the Stilo AC0204.2 lead and female leads | Works with the Stilo AC0204.2 lead and female leads | Works with the Stilo AC0204.2 lead and female leads | Works with the Stilo AC0204.2 lead and female leads | Works with the Stilo AC0204.2 lead and female leads | Does not work |
 OMP Star J IntercomFrom £193.20 | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work | Works |
 ZeroNoise Valiant headsetsFrom £35.40 | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work | Works |
 Stilo Venti Trophy RallyFrom £441.60 | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work | Does not work |
What each helmet plugs in with, and the ZeroNoise amplifiers it works with. Where we list more than one version, they all take the same plug.
Open face rally helmet with the ZeroNoise kit fitted at the factory, ending in a female Nexus socket on a curly cable.
The ZeroNoise kit is moulded into the shell with a female Nexus socket; the Pro and Carbon set it into a side cover.
ZeroNoise WW kit: wired through the Nexus socket, or wireless with the Fearless WW ClearVoice.
Wired like any Bell rally helmet. Ask us before relying on the wireless link with the current Fearless WW.
Full face rally helmet with the ZeroNoise kit and a female Nexus socket on an external cord.
FIA 8860-2018 full face rally helmet with the ZeroNoise kit and a female Nexus socket.
Off-road style open face helmet with the ZeroNoise kit and a female Nexus socket.
Sparco fits a female Nexus socket in the shell.
FIA 8860-2018 open face helmet with a female Nexus socket in the shell.
OMP fits a ZeroNoise intercom kit with a female Nexus plug.
Die-cast Nexus connector, but Sparco does not publish the gender, so we confirm the leads before you order.
The full face and open face kits end in a male 4-pin Nexus plug (the flat-pad open face kit also comes as a female).
Through the Stilo AC0204.2 lead, which ends in a male Nexus plug, into female amplifier leads.
Track day helmet with a stereo plug on its intercom kit, for the Valiant.
Open face and full face kits on a 6.35 mm jack, for the Valiant.
Stilo Trophy electronics, which only work with the Stilo Trophy 2. No ZeroNoise route.
No ZeroNoise amplifier connects to it.
The same view from the other side. Every Nexus amplifier works with every Nexus helmet once the lead gender is right; the difference between them is noise processing, Bluetooth and wireless. Our rally and track intercom comparison goes through the features in more depth.
Analogue, two seats, 12V, camera output. Male or female leads.
Works with
Digital, TERRAIN and ENGINE filters, BOOST and ROAD/STAGE, radio and camera. No Bluetooth. Male or female leads.
Works with
ClearVoice noise processing in the IP65 2026 case. Two male, two female, or one of each.
Works with
ClearVoice, Bluetooth, ROAD and STAGE modes, radio, camera, app. Two male, two female, or one of each.
Works with
The Fearless without Bluetooth (ZeroNoise also turns off radio in and out). Two male, two female, or one of each.
Works with
Driver and co-driver intercom plus a Bluetooth phone link to the pit, with push-to-talk.
Works with
Wired to any Nexus helmet, wireless to the Bell WW helmets and the ZeroNoise WW headset.
Works with
Entry analogue amplifier on 6.35 mm jacks. 9V or 12V, camera output. No Nexus.
Works with
If your helmet has no intercom, a ZeroNoise kit fits behind the lining. The plug on the kit decides the amplifier leads, the same as on a helmet.
| Part | What it is for | Price inc VAT |
|---|---|---|
| ZeroNoise Open Face Helmet Intercom Headset | Open face, flat speaker pads and boom microphone. Male (6300005) or female (6300002) plug. | From £75.60 |
| ZeroNoise Open Face Helmet Intercom Headset With Integral Ear Cups | Open face, speakers in foam ear cups. Male plug. Fits the Sparco Flux RJ with the ear foams removed. | £196.80 |
| ZeroNoise Full Face Helmet Intercom Headset | Full face, flat speaker pads and chin bar microphone. Male plug. | £75.60 |
| ZeroNoise Full Face Helmet Intercom Headset With Integral Ear Cups | Full face, speakers in foam ear cups. Male plug. | £196.80 |
| ZeroNoise Valiant Open Face Helmet Headset | Open face kit on a 6.35 mm jack, for the Valiant. | £35.40 |
| ZeroNoise Valiant Full Face Helmet Headset | Full face kit on a 6.35 mm jack, for the Valiant. | £36.00 |
| ZeroNoise Professional Practice Headset | Over-ear headset for recce and road sections. Male or female Nexus plug. | From £180.00 |
| ZeroNoise Valiant Practice Headset | Over-ear headset on a 6.35 mm jack, for the Valiant. | £138.00 |
| ZeroNoise Pit-Link Microphone Helmet Kit | Full face microphone kit with an earplug socket, for radio and the Pit-Link. Male 4-pin or 5-pin. | From £175.64 |
Most installs need no adaptor at all, because you order the amplifier with the right leads. These are for the cases where the genders already clash, or the run is too short.
| Part | What it is for | Price inc VAT |
|---|---|---|
| ZeroNoise Nexus Male To Male Adaptor | Joins two female Nexus sockets, for example a Bell helmet on an amplifier that already has female leads. Crossed wiring. | £64.80 |
| ZeroNoise Female to Female Nexus Adaptor Cable | Joins two male Nexus plugs, for example a ZeroNoise kit on an amplifier that already has male leads. Crossed wiring. | £64.80 |
| ZeroNoise Nexus Male to Female Extension Cable | Adds 150 cm without changing gender. | £64.80 |
| Stilo AC0204.2 Adaptor Lead | Stilo lead that joins a Stilo WRC helmet to a female Nexus, so it plugs into a ZeroNoise amplifier with female leads. | £72.00 |
| ZeroNoise Nexus Male To 3.5mm Jack Adaptor | Male Nexus to a 3.5 mm jack, for a female-socket helmet and a phone. | £81.60 |
| ZeroNoise Nexus Female To 3.5mm Jack Adaptor | Female Nexus to a 3.5 mm jack, for a male-plug kit and a phone. | £81.60 |
| ZeroNoise Nexus 4 Pin Female to 5 Pin Male Adaptor Lead | Female 4-pin Nexus to male 5-pin, on the radio side. Ask us with your radio. | £76.80 |
| ZeroNoise Nexus 4 Pin Male to 5 Pin Male Adaptor Lead | Male 4-pin Nexus to male 5-pin, on the radio side. Ask us with your radio. | £76.80 |
Questions on a lead that is not here? Drop us an email or click to open a chat, and tell us the helmet and the amplifier.
This is the one that catches people out. Say the driver wears a Bell and the co-driver a Stilo Venti4 Trophy Plus. The Bell has a female socket and wants a male lead; the Stilo goes through the AC0204.2, which ends in a male plug and wants a female lead.
The ClearVoice amplifiers solve it at the point of order: choose the one male, one female version. On the Brave or Fury, both leads are the same gender, so add a 6400004 or 6400005 adaptor to the seat that does not match. Garreth’s rule at the counter: tell us both helmets before we choose the amplifier, not after.
Cameron says buy the Fury. The Brave is a good analogue box, but once a car gets loud the Fury’s TERRAIN and ENGINE filters and the BOOST button are what keep pace notes clear, and you are not going to change amplifier and leads again in two seasons.
Garreth says a quiet club car does not need it. The Brave plugs into exactly the same helmets, and the £115.80 difference to the Fury buys most of a second helmet kit. For a handful of road rallies a year, he would fit the Brave and not think about it again.
Where we agree: get the lead gender right when you order, and if the two seats are on different helmets, say so before you buy anything.
Three set-ups from the guide, with totals from the live prices. Each is one helmet and one amplifier, so add the second helmet for the other seat.
Bell helmet, analogue amplifier with male leads.
Digital filters for a louder car. Male leads.
One male, one female lead, plus the Stilo lead for the Stilo seat.
Yes. Every Bell rally intercom helmet has a ZeroNoise kit with a female Nexus socket, so order the ZeroNoise amplifier with male leads and it plugs straight in.
Yes, it uses a Nexus connector. Sparco publishes a female socket on the Flux RJ-i and Prime RJ-i Supercarbon, which take male leads. For the older RJ-i, RJ-i Carbon and the special editions, Sparco does not say which gender, so tell us the helmet and we will confirm the leads.
Yes. OMP fits a ZeroNoise intercom kit with a female Nexus plug, so it takes an amplifier with male leads.
A Stilo WRC-type helmet, such as the Venti4 Trophy Plus, Venti4 WRC or ST6 Rally, joins through the Stilo AC0204.2 lead into an amplifier with female leads. The Stilo Venti Trophy Rally runs Stilo Trophy electronics and does not connect to ZeroNoise.
No. The Valiant uses 6.35 mm stereo jacks and the Bell has a Nexus socket. The Brave is the entry Nexus amplifier.
No. The ZeroNoise 6400004 joins two female ends and the 6400005 joins two male ends. They are 15 cm crossed-wiring adaptors that go between the lead and the helmet.
The Bell Mag-10 Carbon Rally WW and HP10 Evo-II Rally WW, and the ZeroNoise WW headset. Any other Nexus helmet works with it on the wired leads.
Usually, yes. The open face and full face kits fit behind the lining. The ear cup kit fits the Sparco Flux RJ once its ear foams come out. Tell us the helmet and we will recommend the kit and plug.
Every pairing on this page comes down to one look at the helmet plug. Female socket, order male leads. Male plug, order female leads. Stereo jack, it is a Valiant job.
Ring us on 0115 647 8650 with the two helmets in your car and the amplifier you are looking at, and Garreth or Cameron will check the leads, or come in and see the helmets in the showroom.
Not sure what fits, which approval you need, or what to choose next? Ask Garreth and Cameron. You’ll get a practical answer from people who handle the kit every day.
