Testing 10 ohm G M speaker

[John M.]

Picked up a ten ohm speaker for a 66. The "short" speaker that was used to replace speakers on A C cars, part number ends in 256 as far as I can tell. Would like to test this unit before installing it but hope that someone has a protocal for testing. I do NOT have a spare radio to use for testing purposes, but is there another method to check both condition and sound output? Any advice or experience wellcomed. thanks!

[Ed H.]

Re: Testing 10 ohm G M speaker

Base test, connect across 1.5 volt battery. I had to do this test just the other day... Beyond that (you'll get a bit of a 'click' if 'good'), you're above my pay grade.

[Tom M.]

Re: Testing 10 ohm G M speaker

If you have an ohmmeter, connect it across the two terminals. You should see a steady resistance of somewhere between 4-16 ohms. If you do, this is a good indicator that the voice coil is ok.
You may also try checking resistance between the speakers metal cage and one terminal. Most speakers will show an open / infinite resistance.

You don't need a 1966 radio to check if the speaker works. Any audio source should serve OK - tv auxiliary speaker output, old home stereo etc.
connect the two leads from your audio source and keep the source volume low. The speaker cannot handle much power and your audio source is probably not going to be happy about an impedence mismatch but you should be able to hear reasonable sound reproduction from the speaker. Keep the test short.

[Harry S.]

Re: Testing 10 ohm G M speaker

Pull off the radio side panel and plug it into the radio. I do believe that the thin speaker installed in AC cars is a myth. As far as I know all C2's irregardless of AC or Non-AC received the same speaker. The low profile speaker was a Service Part.

[John M.]

Re: Testing 10 ohm G M speaker

Thanks for the replies. Will use the info you provided. Harry, I agree with you about the "thin" speaker not being used in production at least up to the end of January , not sure what happened after that and during 67 production but perhaps someone familiar with late 66 and the 67 AC cars will respond. I am using one just to simplify installation and the fact that I have one to use. The thinner speaker was certainly a service part, and it will be interesting to see if anyone adds to this post with information of one being found in a car built after January of 66.