Measuring Resistance issues

[ruseriousclark]

Three 8 Ohm drivers in parallel should yield a resistance of 2.667 Ohms. However I just wired it up and threw on the meter and cannot get anything other than 3.4-5 Ohms as a reading.

Busted meter or is my math just that bad?

FYI... 3 M3N's wired in parallel

[BOBinGA]

Your math is correct, but 8 ohm speakers usually have a DC resistance in the 6 to 7 ohm range. This would mean a DC resistance of 2 to 2.3 ohms for three in parallel. Are you sure that one is not disconnected (or blown) and therefore not really in parallel? You would expect two in parallel to be around 3.4 ohms.

The other possibility is that your multimeter leads have a high resistance. If you short them together, does your meter read zero or does it read something like 0.5 ohms like my cheapy meter does? 3.4 minus 0.5 is under 3 which is getting closer to what you would expect. Plus cheap meters aren't that accurate at these low resistances.

-Bob

[Curt C]

The published Re of the M3n is 6.5 ohms. 3 in parallel should measure about 2.2 ohms.

With your measured resistance, it is possible one of the M3's is not electrically connected.

C