Im getting ready to pull the trigger for a 20s dual kit cuz of the features and its ability to use earbuds (we wear half helmets on the vulcan), are the speakers that come with the kit removable from the unit when you use the ear buds? I plan on using the speakers in my modular snowmobile helmets in the winter. Im also wondering how hard it will be to transfer the units from the half helmets to the modular helmets? And last but not least where did you buy your sena,s from? Thanks in advance for any info you can provide me.
So, the Sena 20S has a 'base' and that base has two jacks, one for the mic, one for the speakers; and an additional earbud jack. It's certainly possible to simply not use the speakers and use exclusively the earbud jack along with the boom microphone. Alternatively, you could use speaker pockets available for half helmets and use the Sena speakers; which work quite good and don't have any legal hairyness in most states. (Most states forbid earbuds on a motorcycle). Just unplug them, easy as that. Stick them in a drawer somewhere.
If it were ME; I'd get speaker pockets such as these:
And just use the speakers. They'll sound better, no earbuds in your ear, etc.
If you're using a real half-helmet it'll have some sort of an EPA liner that those speaker pockets (and the 20S mount) will slide into. If you use novelty helmets then they generally don't have that liner (if you don't have a liner those pockets can slide into, you don't have ANY protection; worth mentioning in case you've been led to believe otherwise.) So if you use the latter than that's moot; but if not, then that's a great solution.
Another option is over-the-ear behind-the-neck headphones, instead of earbuds; which are legal in more places than earbuds are. A few of my riding buddies use them on their Harley's CB units. Something like this:
Naturally you can spend a bunch more if you wanted better quality. Those would plug into the 20S base just as well as earbuds.
As far as switching between helmets; one cool thing about Sena is that they sell each individual part separately. You'll get three microphones; so you'll use the attached boom with the half helmet and probably the adhesive internal boom for the modular. But the EASIEST way is just to buy extra bases. The part number is 20S-A0202 and they run about $75. That's an extra expense of course; but it means you simply need to click the base onto the other helmets. If you don't want to do that, then all you have to do is loosen the thumb screws, and plug in the speakers. If you share the base across two helmets; I would suggest just sticking with the external boom microphone and not switching between them.
I bought mine on Amazon. I have an Amazon prime account, and Amazon is just great anyway. RevZilla is another good source. You definitely want to buy from somewhere with a generous return/RMA policy, as dealing with manufacturers if you get a dud can be a hassle. It's rare, but if you get a defective unit on deliver, it's much easier to deal with Amazon's super painless return process to just return it, rather than having to contact the manufacturer, get an RMA, and wait weeks for a replacement. Similarly, it can be nice to get it at a local store; though nobody anywhere near me sells them.