I have read all the documentation I have on the SR Mariner instruments we have and find nothing that refers to location near audio speakers. I would like to add a second set of small (4" x 6") box speakers down below for the CD player and found a perfect spot on either side of the companionway. That puts the speakers within 12-14" of the back of the instruments. They are digital readout speed, depth, wind ......well, the apparent wind is not digital but the windspeed is. There is no bulkhead mounted compass, it is several feet away on the binnacle so no issues there.

Any thoughts on placing non-magnetically shielded speakers near sailing instruments?