In helmet audio systems are expensive, proprietary to the manufacture, and cumbersome.Like this NCOM $300 (Amazon) If you have an iPhone and a helmet with a comm system capabilities, then you can DIY and save time, money, and communicate with any biker. Optional (write in a pair of headphones with a microphone and your can talk back directly.) I use the Outdoor Tech ADAPT Bluetooth adapter instead. (Amazon)
You can connect the helmet headphones to the ADAPT and get a bluetooth connection to your phone; listen to music, get directions, and communicated because the ADAPT has a built in microphone. The big buttons on the ADAPT help when wearing gloves. At bluetooth will give you a wire free connection. In the future I plan on taking the built in NCOM bay and installing the ADAPT directly in there.
Your helmet may need some modifications to do this, but mine did not, so I will show you exactly what I used and how simply it is to attach. I used the soldering iron at TECHSHOP to repair and modify my headphone cable. Some heads won't require this step. So this was made at Techshop.
What I used:
1. Pair of Koss Portapro headphones (Amazon)
2. Nolan N43E Trilogy Helmet (all newer Nolan helmets should have the same internal mounting system. (REVZILLA)
3. Soldering iron (used to repair my old headphones, may not be necessary for yours unless you need to take apart headphone cables for installation).
4. Tape (Gorilla Tape, Duck Tape, Gaffers Tape, something with good grip) I actually used White Medical tape.
The Koss Portapros have a lifetime warranty, so if somehow they break inside your helmet you can just send them back and get a new pair for $7. Not to mention they have great base and sound fidelity for such small and flat headphones.
Step 1: Prep the Koss Porta Pros
Now you have these blue headphones with foam, remove the foam and get ready to mount.
Step 2: Prep the Helmet
Step 3: Just Do It Nike Style
And that's it. Your done. So Simple and why spend $300 for propriatory NCOM communications when you can get away with it for less than $80 (40 for koss, 40 for Adapt).
The 1/8" jack can plug in anywhere you want to the ADAPT and you've got it all.
Hope this was helpful. Please leave comments and alternatives for headphones and helmets below.