Roger system doesn’t need telecoil in HAs per se.
If you use roger my link as a receiver, then its loop around your neck and HAs with telecoil are needed to work.
However, you can use other ways of connecting. I’ll write all options, not KS9 specific ones. Just to easier explain the whole thing.
One is to use HAs streamer device and plug roger x in it. Then roger mic will transmit to roger x receiver, which will give sound to the streamer, which will send sound to your HAs. This way you need 1x roger x device (small cube with 3 pins).
Another is to use direct audio input shoe/boot (DAI) on each HA and plug roger X in each. So you’ll need 2x roger X. But you’ll omit loss of signal quality due to streamer from the previous example.
And then, you have roger direct, which is built in in marvels. They essentially replace DAI shoe AND Roger X device, as a device. You still need a key/licence/receiver to activate that hardware in it (don’t ask me why phonak calls it receiver, naming things isn’t their strong suit).
KS9 recently allowed users to activate roger direct hardware in them. You need to go to the audi, ask for new HAs firmware. And then ask for price for enabling receivers OR you buy roger select iN version or roger pen iN version which come with 2 licences/receivers in them and they should only be transferred.
Even if you want to use more devices, keep in mind that each HA needs only 1 licence/receiver, so, if you buy roger select iN, other gadgets don’t need to be from iN family.
Also, when buying, be careful what you ask for.
You also can buy regular (non iN) version of roger mics, then buy 2 roger X devices (if you have 2 HA/want sound in both), and then licence/receiver can be transferred from roger X (cube) into marvels, at audi, using little device for that.
For iN family of products, that intermediary device isn’t needed since iN gadgets can do the transfer to the marvels themselves.
Go to costco, ask for firmware update, buy roger pen iN or roger select iN, transfer licences/receivers to your HAs (which are marvels in disguise) and that’s it.
Ideally, ask to trial both, to see which catches sound better. I’d assume select and put it on that shelf between front seats pointed towards back.
Select is disk that’s meant to stand on table, for restaurant noise for example. Mics point up.
Pen is meant to be pointed towards, has one opening on side which can be put up or down, I’m still figuring out how exactly to point it to get the most out of it.
Both can also be worn in lanyard mode, but I suppose you don’t want clients to forget to return the expensive mic back to you.
Pen can be put on table, but it’s for more disciplined environment like meeting where people take turns and there’s no bg noise. From what I’ve gathered from other people descriptions, I still haven’t tested everything with my trial ones.