Virus has given me time to focus on my supreme so I pulled the radio (Delco model 23AFP1)which hasn’t made sounds in over 20 years. the mono dash aftermarket speaker must’ve been replaced long before I bought the car (95) because the surround, cone, spiderweb, and cloth speaker cover were disintegrated and it says “made in Taiwan 8 Ohm,” so I presume not original. I understand that the speaker should be a 10 Ohm 10 x 4 full range speaker. Looks like there are very few replacements available, so I’m just going to go with whatever works (not worried about originality). OPGI has a 6 x 9 10 Ohm Rear speaker that may fit but it’s 60 watts. Does anybody know what power this receiver puts out? I assume it’s something like 15 Watts Into a single channel or something similar.

also, there is a single dk blue 18 ga wire with connector on the passenger side of the unit that wasn’t connected to anything. Seems like it originates up near the tuning ****, perhaps for the balance/fade control for a set up that had a rear speaker (which mine does not have). Any idea what that is? Besides splicing into the front speaker lead connection, was there a factory provision for dual ft/rear speakers (mono)?

thanks for any info - Mark

 

The blue wire feeds the rear speaker if used. No provision for dual front speakers. Some people install kick panel speakers.

 

Thanks for the reply,yellowstatue. Do you know if the lead for the rear speaker is wired through a separate powered output channel, or is it wired to the same output as the front speaker, or is it just a line level out signal that would then go to some other amp? I understand that my unit is not stereo (no fade/balance control) so are there two mono channels, necessitating two 10 Ohm speakers, or is it one channel and if so, could I get away with two 4 Ohm speakers in series? Or do I need to find a vintage Delco amp to power whatever rear speaker I hook to it? Service manual shows a “stereo Adapter” Is that an amp as well? Still wondering what sort of power level the receiver puts out, particularly if it’s presented with twice the load.

Also, is the rear speaker powered by the single lead from the receiver grounded to the body somewhere or should that go back to the receiver? Thanks for any info - Mark

 

Yeah, there was such. Pull off your tuning **** and the blank behind it. You will see three holes and a jumper that jumps the middle hole to a wire that goes back to the one speaker wire by the power. That is "front mono". You can get a fader ****, sometimes called a biphonic adapter, which is basically a potentiometer, three leads, and the ****. Remove jumper, plug in adaptor, put tune **** on. and now the extra blue wire will get a feed. All it did was jump signal to the other wire and allow some relative volume adjustment. The second blue wire is, with one of these, the same signal as the front, and is powered.

You could get away with two fours in series. Just don't go too loud.

Stereo is a total different radio. 70-71 had stereo adapters, 72 was integrated.

 

Thanks for the explanation Koda. I think I’ll leave well enough alone and stick with one speaker. I don’t want to burn anything out, just want to be able to turn the device on and have it function. I’m just psyched that the unit still works. Had it upstairs in the living room and with an antenna was able to get the major FM stations loud and relatively clear. Was surprised that analog signals are still broadcast.