I purchased two sets of Motocom MC-555 in-helmet speakers for use with a set of cheap Uniden FRS radios I bought. They were supplied with a handlebar PTT button and an in-helmet mic as well. For a few dollars more I bought an adapter plug which allows me to plug into the headset outport of my small portable radio, so now I listen to the news on the way into work when I'm riding solo.
The speakers are perfectly fine for inter-bike comms and talk radio but lack the bass range for music. I was thinking it could be blamed on the cheap radio I am using, but I suspect its just a factor of the size of the speaker - it's hardly big enough to be a tweeter, let alone a woofer.
I do much prefer them to the ear-bud headphones I was using before, which really hurt when putting on or taking off the helmet and which would dislodge inside the helmet at the most inconvenient time. I also get more exterior noise with the speakers but considering the noise is often emergency vehicle sirens, car horns or crosswalk signals this is not a bad thing. I would recommend them. If you're interested in reading more check out
Motocomm at
https://www.rflimited.com/Default.asp.
Now, in the same vein, I would be grateful if anyone could suggest the best method for wiring in a female stereo headset plug into the radio of a K1100LT, where one doesn't exist. I think my speakers would perform much better if they weren't plugged into my dollar store FM radio. (Honestly, I bought it for only $5 Cdn). Cheers.