Re: LT - Voice II Intercom issue
I'm Ed Davis, owner of EdSets, the 'alternative' headset company. We've been doing headsets for Wing owners primarily and some BMW owners, but the Voice II is a moving target.
To nail it down and be able to really do good design, we need one or more volunteers to help us with some info gathering. I understand the VOice II requires a 'powered mic' which in reality means a headset with a built-in microphone preamplifier to bring its 200-Ohm dynamic mic signal (about 5mV typical) up to around 100-120 mV before it reaches the Voice II mic input stage. Of course, this is only an educated guess. Neither BMW, or the company that makes the Voice II will share tech data, so we have to reverse engineer, which is ok, but difficuilt since I don't have a bike to test with.
A few of our customers are using our headsets with condenser mics but I think we can improve on that with a preamp system that plugs inline so you can use any headset with it, and not just the ones with built in mic preamplifier. This preamp scheme is also used on the Harley Ultra, which uses the identical mic found in J&M 'dual mode' mics, namely a 200-Ohm dynamic (moving coil/magnet technology) mic.
Matt was here with his lovely wife this weekend, and we tested several aspects of his bike, and found some odd behavior compared to other systems, and we're still looking into it, but bottom line was that while the mics did ok, they could do much better and we got a bit fooled by the VOX threshold. It only took about 15mV to break VOX, but signal levels of 5x that didn't give us enough signal to really improve things. The vox levels indicated a typical condenser mic signal level, but in reality, I think voice level signals should still be around 120mV or more.
If you can't come here, but have an oscilloscope, I can send you a test cable and you can make simple clip-on test with your system. Just plug in my test cable, plug in the headset and then connect the scope leads per my instruciton, and measure the AC PP voltage as you speak and basically that's all I need! NOTE: This has to be done with the 'official' powered mic from BMW or J&M.
SO, we're here in Dayton OH. If you own a Voice II on an LT and are willing to come by our shop for a few hours, we can make some safe electrical tests before final design of our preamp, and make sure what kind of signal levels the VII needs. We'll make it worth your trouble and you would be helping the community have another option for headsets for this great bike.
EdSets offers true high fidelity headsets with gold plated connectors, super durable long life cables, and studio quality microphones, as well as unique features like a 3.5mm input/output jack on the headset module, full modularity of all components, 2-year warranty and the best service imaginable.
We've always been a community driven business, and all our designs are 'approved' by the community before we produce them, and I'm looking forward to the same experience with the LT community.
We're in Dayton OHIO area, and look forward to hearing from several of you!
If you can help, here's my contact info.
Ed Davis, President
2416 Passage Key Trl
Xenia, OH 45385