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Discussion in 'Amps and Cabs [BG]' started by Bowedtoothdoc54, Nov 3, 2016.
The WP 400 & 700 are both 4 ohms.
400W @ 4 ohms; 250W @ 8 ohms
700W @ 4 ohms; 450W @ 8 ohms
Hi If you use an ohmmeter to measure the speaker you are not measuring the impedance but the DC resistance, even though the cab says ohms. For an 8 ohm cabinet you should measure about 5.6 ohms DC. I forget the exact number for a 4 ohm but I think it's around 2.3 or something like that. When you measure these numbers don't panic and think something is wrong cause it's not. Impedance and Ohms are 2 different things. Ohms is much more straight forward. Impedance is more complicated to explain. hope this helps....
In that light, I'd try the series speaker cable for sure.
That's what I was wondering. I owned a SWR 750x for about a decade. It could run 2.6 just fine. Not sure about the head the op mentioned though.
Thanks Everyone for the input! Based on all the posts I am thinking that I would probably give out before the rig .
Looks like you used the "diode check" setting, The meter needs to be on Ohm setting - Omega symbol.
Ok, Thanks! I am thinking the Ohm setting would look kind of like a horse shoe?
Will try again after work today and report back.
Yeah, kinda looks like a horse shoe.
What meter do you use to measure z? What frequency do you set your meter at? Z varies with frequency, DCR does not.
I have a cheap Craftsman unit from Sears. I was just looking at the manual and It looks like I need to move one of the wires to a different terminal for measuring Ohms?
what model meter is it?
It's the 82141
Craftsman Multimeter | Part Number 82141 | Sears PartsDirect
So here are my results with Vdc set to 200 and both cables to the right connectors.
My Ampeg portaflex 115 which is an 8 Ohm cabinet tested 007.
Both SWR cabinets tested 003. The 410 is supposed to be 4 Ohms and the 115 8 Ohms?
I'm still not sure if I am doing the measurements correctly and the numbers are jumping all over the place before they finally settle down to the numbers above?
It would almost seem theyre both 4ohm cabs. I typically set the meter to the lowest attenuation, Im thinking your .003 reading is actually 3. I wonder if the 15 was replaced with a 4 ohm driver, hhmmm.....
Did someone say 'serial speaker cable, easy fix'?
So I would go from amp to 4 Ohm cabinet and from 4 Ohm cabinet to 8 Ohm cabinet?
Yup... easy and done
Just to be clear... a serial speaker cable is a special thing, though.
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