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4-channel 4 ohm patches with XO4/4A loudspeaker management system
Fig 9.4-7 4-channel 4 ohm patch using Funktion One XO4A controller and F40Q amp
(4 x 2-way configuration shown, F81s with Speakon connectors)
Fig 9.4-8 4-channel 4 ohm patch using Funktion One XO4A controller and F40Q amp
(4 x 2-way configuration shown, F81s with Phoenix connectors)
Again, note the connector blocks.
Limiter settings for 4 ohm operation
XO series limiters control the maximum voltage applied across the loudspeaker terminals by limiting the
signal voltage delivered to the power amplifier. This means that, as long as you have a good, stiff mains
supply, you can use the same limiter voltage thresholds irrespective of 8 ohm or 4 ohm operation.
However, if your mains supply voltage drops by more than 2% or 3% on load, you may need to reduce the
recommended long-term limiter threshold levels by a dB or so to prevent the power amplifier from
prematurely clipping. See section 11 for further information on limiters settings.
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