For a line array with eight midwoofers, each being an 8 ohm impedance driver, the usual wiring choices yield either a 16 ohm or a 4 ohm nominal impedance. The 16 ohm wiring is good for use with tube amps, especially SET's and OTL's. The 4 ohm alternative might be a better choice for use with a solid state amp.
If you know in advance you will be using the array with both tube and solid state amps, is there any reason why you wouldn't wire it for 8 ohms nominal impedance using a quasi 3-3-3 arrangement, with an 8 ohm resistor substituting for the 9th driver?
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