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I used a Quam replacement in my Cardinal and had no problems with the install or the compass.

For older 150's (such as my '59) the speakers originally in them were a "reverse driver" meaning the magnet, instead of being on the back of the cone and frame, like 99% of what you see today.... is located inside the cone, in the area where a small tweeter cone is found in some speakers. This was done to reduce overall thickness of the speaker. These speakers were used in 1950's station wagons in the rear, and for other automotive purposes.

Years ago, when I found the cone in my rotten, I removed it and sent it to a small one man shop I found advertising in Hemmings Motor News. He reconed automotive speakers for a living (or hobby, I'm not sure which) and had it reconed. Worked as good as new. He was slow, and it took several phone calls to get it done and back, but, where I'm going with this, is that I think you can still get cones replaced in antique automotive speakers if you search around, you can find someone to do it.

Charles

I received the 4x6 speaker from Aicraft Spruce
http://www.aircraftspruce.com/catalog/avpages/quam_speakers.php.

I was able to use the steel frame from the old 6x8 speaker as an adapter.

I cut out the old magnet with a hacksaw, drilled some mounting holes, bolted the new speaker onto the old frame, soldered the wiring onto the speaker, and mounted the new speaker in the plane. It looks good, and it works.

When I install the headliner, I'll need to carefully cut some small holes in the headliner for the speaker.

I have the old Radio Shack Special. Its the 4 x 4 external amplified speaker in a enclosed case. Its 12v and plugs in the lighter. I mounted it in the rear on the quarter panel behind the rear child seat I have in my 1968 150H. It has 2 screw knobs on it that screw into the bracket and can be easily removed in a matter of seconds! Black in color. I think I paid $19.95. I also have it wired in to my Monroy Traffic Avoidance ATD300 Unit for voice alerts. It is extremely Loud!! Works fine for me and does not effect the compass seeing it is in a enclosed case and not mounted to any metal.