1968 Speaker Question
#1
1968 Speaker Question
I recently installed a 68 am/fm delco from a cutlass in my car and wanted to hook up 2 speakers under the front buckets. I'm getting conflicting information on the correct speakers to install... some say 8 OHM and some say 10 OHM.
Which is correct? Thanks!
Which is correct? Thanks!
#3
On Delco radios of that vintage, the output transistor circuit is tuned for 8-Ohm speakers. If you use 10-Ohm, you will need to retune (rebias) the output transistor collector. If you don't, you will have poor output but there will be no radio damage.
There have been a lot of new speakers sold where the resistance does not measure what they claim. Check your speaker coil with the speaker disconnected from the radio. The speaker coil must measure 1.5 Ohms. If it is 1.3 Ohms or less, it will overheat the output transistor stage and could draw so much amperage that the 12 Volt supply wire to the radio could be damaged.
There have been a lot of new speakers sold where the resistance does not measure what they claim. Check your speaker coil with the speaker disconnected from the radio. The speaker coil must measure 1.5 Ohms. If it is 1.3 Ohms or less, it will overheat the output transistor stage and could draw so much amperage that the 12 Volt supply wire to the radio could be damaged.
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