Impedance of RTA 12B

[gene stangel]

I have a chance to purchase a used pair of RTA 12B.
What is the nominal impedance?
Seller claims tweeter is SL3000 but parts list
only lists SL1000. Which is true?
Thanks

[F1nut]

I'm not sure of the impedance, you could check with Polk. The tweeter is a SL1000.

[stubby]

My RTA 12C's are 4 ohm nominal, I would bet the B series are the same. You will of course want a high current amp to really drive them.

Stubby

[ashuanipix]

Just happened to see your post today so don't know if you are still checking now that 3 weeks have gone by.
According to the equipment test report done by Hirsch-Houck Laboratories in the early eighties on the RTA 12 B "the impedance of the Polk 12B was less than its rated 4 ohms between 100 and 1500 Hz, measuring about 3 ohms over much of that range. Maxima of 12 to 15 ohms were measured below 20 Hz as well as at 54 and 3,500 Hz."

Hope this is still useful for you.