My Bose X is 2 months past the warranty period and they refuse to repair it. This is the 3rd time it has failed in the 5 years I've had it.
That's the last Bose I will ever buy.
Lightspeed have been very good good in replying to emails. I can confirm they do offer the Zulu with either the low or high impedance mic. They quoted $900 dollars for either choice.