8 ohm fane sb1000 measuring at 4 ohms! |
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Natedub
Registered User Joined: 07 January 2013 Status: Offline Points: 126 |
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Posted: 01 March 2018 at 6:46pm |
I am refurbishing my old 218's that are loaded with fane sb1000. When I had the cabs made I was told they were loaded with new 8ohm fane sb1000 x2 per cab. Each cab is supposed to be 4ohms (2x 8ohm in parallel) When I stripped them out to paint I noticed the wiring appears to be in series. The drivers still have the original stickers and all say 8 ohms but when I measured them with my meter they all read exactly 4ohms! Now I realise that impedance and static resistance isnt the same and they probably read lower than 8ohms but seriously 4ohms?? Anyone else found this? I dont know what to do. I dont want an 8ohm load as they will be underpowered but if I wire in parallel then it will be 2ohms! Any insights? I am thinking all 4 must be mislabelled but seems unlikely?
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Offline Points: 561 |
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anywhere between 4-6 Ohms DC Resistance is very believable for an 8R driver :)
Only way to really be sure is to run a sinewave sweep and get an impedance plot done (I think REW has this functionality? if not theres a few of the PHAT CAR CHOONZ brigade using similar software to measure T/S parameters, Impednace, etc.) |
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Natedub
Registered User Joined: 07 January 2013 Status: Offline Points: 126 |
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Thanks for your reply, that puts my mind at rest. I have seen 5-6 ohms on 8ohm driver but never as low as 4ohm before. Learning all the time
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Offline Points: 561 |
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They're all "Nominal" ratings... look at the rated impedance plot for most drivers.
They just have to stick the label for the nearest standard of speaker impedance on it for marketing |
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