Does anyone rember how to calculate impedance?

Don't worry about the slide rule, I think I still have one. It should be packed away with the eight track and the Elcassette.

Here's the easy way to calculate resistances in parallel--use this http://www.1728.com/resistrs.htm site. Lots easier than having to use one's brain.

Speaker systems do NOT sound good when connected in series. I believe it has to do with all the signal driving the 2nd system having already run thru the 1st system's crossover. (However, it's plenty OK to connect drivers in series.) Connect the systems in parallel.

Lower impedances do not tend to cause amplifiers to oscillate, but one does need to be careful about the amp running out of current. That will happen only if you're trying to drive a quite-lo-impedance load quite loudly.
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Jeffreybehr-I was giving advice to another Audiogoner. He is runnig a satellite system with two mini-monitors and two subs. It looks like there is no crossover for the subs. He essentially is running them in parrallel. He twisted the wires together and connected them to his reciever. I suggested he try running thme in series. I wanted to make sure he did not improperly load his amp. He says the speakers are rated at six ohms and his amp has selectable impedance. Sounds Like he is okay.
I learned this stuff years ago and forgot. It's not really a problem with the level of components I use. Thanks!

El Gordo....you just spilled the beans on your age.

Did the el cassette stay on the market for more than 6 months?

mitch

For multiple resistors in parallel:

1 1 1 1
- = - + - + - ...........
Rt R1 R2 R3

therefore four 8 ohm speakers in parallel equal 2 ohms.

I love answering electrical questions BUT remember, sound has NOTHING to do with spec's!!!!!!!!!!!!! Just listen.