Possible speaker short?


I am moving into some full range speakers.I would like to sell my older Castle bookshelves however i think there may be a short in them.When i connect them my amp runs hot.I tried measuring them with a voltmeter.Both the low frequency and high frequency posts give me a reading when the brass jumpers are installed, however when they are removed i only get a reading from the low frequency binding posts.Should i be getting a reading off of both?
blazen69

Showing 1 response by xti16

Timrhu
Impedance is different than DC resistance. Impedance is an AC resistance - Not DC. Ohm meters measure dc resistance. A 4 or 8 ohm speaker/driver will read almost zero (because its a coil) if there are no other components in the path. Dont forget the crossover. A coil typically close to 0 dc resistance but a capacitor should eventually read open (after the cap charges).

What I'm saying is an ohm meter will not give you much to work on when measuring at the posts. Individual components have to really be measured OUTSIDE the circuit to be somewhat accurate.

I agree with Gs5556. A shorted speaker should shut down the amp or blow a fuse. On the other hand an internal crossover resistor or capacitor may (but not likely) could cause an excessive current draw resulting in your amp getting too hot.

Do you have the floorstanders yet? If so do they 'make' the amp run too hot too?