Are these aircraft cabin speakers FAA/PMA Approved for installation in certified aircraft?
Per the manufacturer, no these are not FAA/PMA Approved.
Your round Quam speaker, part number 11-04646, shows in your overview to be 6x4. I'm not certain where the mounting holes would be, I envision a round speaker having an equal distance on the sides, like 4x4 and the Oval speaker being 6x4.
Thank you for bringing this mistake to our attention. It has since been fixed in the Specifications tab. Please review the "Specifications Sheet PDF" in the documents tab. It has all the dimensions listed as well as drawings showing mounting hole locations. The round speaker, 11-04646, is model number 6C5FR. The oval speaker, 11-04649, is model number 46C5FR.
I have a 6 round cabin speaker that I would like to replace. Will this speaker mount in the same place?
This is a 6.5" round speaker. There are no diagrams available.
What is is the terminal connector size on these aircraft speakers?
The terminals are .205" wide.
What are the dimensions of the screw holes of the oval model?
Please see the 4X6 oval dimensions found under the Documents tab on the web page.