I've read all these issues of echo. I'm going to try the follow:
My car has a DDin opening for a factory voice controlled nav option. I opted to not get the factor nav so that I could install the Z1. Well, in the panel that sits below the steering column that angles down right above your shins as you drive, I noticed 4 slits to the right of the column in a circular pattern...just like where a factory mike could have been mounted. I'm going to put my mike there. Now the factory Bose system is a seven speaker system (which blows by the way)...but the odd speaker is a center speaker in the dash. I'd like to try and hook that center speaker to the HU as the phone speaker (assuming the impedance is the same...I'll have to research that one a bit). This will eliminate the stereo speakers from an interference with the mike. It might also provide some natural shielding to the mike as well. The sound will reflect off the windshield for me to hear, but it will be mostly absorbed by the interior before it bounces off any more glass and hits the mike. By the time any stray reflected sound waves reach the mike, I'm hoping they will be too weak to be detected by the microphone, thus eliminating any echo or feedback.
One other thing I noted is that the install manual contradicts itself. On page 7, it lists the port next the mic port as "not used" but on the following page 9, it specificlly shows a guide speaker plugging into that same port. Anyone use a guide speaker?
Jay
Addendum...it appears that the guide speaker only seems to be an "option" when installing the surrond sound processor. Has anyone looked into this issue or "option"? Or has anyone tried installing a guide speaker without the surrond add on?
Also, also, I think the guide speaker is 8ohm.