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6 speaker wiring configuration


bootsy666
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I've recently built a 6x15 bass cab. I was just going to find 6ohm speakers to wire it to 4ohms, but I've been told by some techs that these configurations with a mixture of 4 & 8 ohm speakers to get a 2ohm load would work, but I'm still unsure to wether it would damage the speakers long term?
The speakers im interested in using are-
Celestion BL400X-15" 8ohm. (2 of these)
Celestion BL300X-15" 4ohm, (4 of these)
Any help would be very much appreciated.
(The image should read 2ohms, not 4ohms)

Edited by bootsy666
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Personally I would not mix drivers with different impedence in the same cab. If you have a combination of 4 ohm and 8 ohm, the 4 ohm ones will be doing twice as much work as the 8 ohm drivers.

However, impedence ratings are a little bit misleading in tha they are 'nominal' - the actual impedence changes drastically depending on the frequency - see typical graph here (this is not the chart for your celestions by the way) for how much it can vary (about 4 - 16 ohms here):


So I would wager that you should be OK with 2.6 ohm nominal impedence and a 2 ohm amp. (many amp ratings are minimum, e.g. 2 ohm MINIMUM impredence) so in that case you'll be erring slightly on the side of caution. Although with a 6x15 cab I wouldn't think you'll need to push the amp too hard!

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As mentioned, the power won't be equally divided if you use drivers of different impedance. Probably better off using 6 x 8 ohm drivers in series/parallel to give you 5.3 ohms. Your amp will deliver slightly less power than with a 4 ohm load but not noticeably.

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With the configuration you have there, the 8 ohm drivers would carry twice the load of the 4 ohm ones. I'd go with dincz's suggestion, which has the added potential benefit that you can use it with amps that don't go down to 2 ohms (ie. the vast majority).

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definitely go the 5.3ohm option, if the budget will stretch to them I'd look at the neo celestion speakers, they're half the weight, about 2.5kg each instead of 5kg each for the ferrite one's you're currently looking at, I've used the 10 inch ones and they're pretty good. I bought mine from Lean Business.

Mat

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