1972 Frankfurt radio 8ohm+ speaker 4ohm resistance

[camarilla]

Hi all,

I bought a period correct Frankfurt mono radio from vintageblau and a speaker from Koenig Klassik Radio.
I’m about to have both installed in my car (1972 911T) but I noticed that Ingo at vintageblau left a note saying only to connect 8 ohm speakers to the radio.
The Koenig radio is a 4 ohm speaker. Will this cause any issues? I was lead to believe that the is correct for the year?

https://www.koenigs-klassik-radios.d...912_33152_5148

[NZVW]

I'm a plumber not a electronic/stereo nerd but I was always of the belief that if you were to put lower ohm (impedance) speakers than what the amp/radio ohm rating is it will cause more current to be drawn , especially at Hi volume levels and may damage the amp.
I did say
Im a plumber though.

[70SATMan]

The plumber is correct. Over driving the final output stage is the concern.

[camarilla]

Appreciate the fast reply. What did these cars come with from factory, and is there an 8 ohm speaker available that will fit in the dash?
I’ve only seen 4 ohm speakers for sale

EDIT: Okay reading more about this seems like there’s no way around it, I’ll need to find an 8ohm speaker. Any pointers much appreciated!

[NZVW]

Try
Woody's Custom Shop

[camarilla]

Try
Woody's Custom Shop

Thank you, yes I saw that name a few times. I’ll give them a ring tomorrow. Thank you 😊

[NZVW]

Thank you, yes I saw that name a few times. I’ll give them a ring tomorrow. Thank you ��

No prob,
I will get back to my water and waste pipes down here in wintery New Zealand
Best of luck ��

[camarilla]

Will keep you posted. Car is going in tomorrow for welding for the radio bracket. Was hoping I could plug in the 4 ohm speaker but I guess that will come at another time

[camarilla]

Another name on the East coast recommended by Ingo at vintageblau:

http://turnswitch.com/

Apparently sell 8ohm speakers.

[fizeus]

The advice you read to preferably install only 8 Ohm speakers on and vintage amplifier is a good advice given the fact that a 4 Ohm speaker is a higher load for old power amplifiers.
4 ohms speaker requires more current to give same Sound Pressure Level if compared to an 8 ohm speaker and this results in much higher load on the amp that can lead to a failure.
You should find the 8 ohm speaker to be on the safe side and avoid damage to the radio amplifier stage, if in doubt always choose the speaker with higher sensitivity.
If you can't find 8 ohm speaker install your 4 ohm but remember to never pump up the volume