Some cabinets have 16ohm drivers for mids and highs. The recommended speaker impedance ratings are usually listed above the speaker wire posts.

Speaker Building Marulla Dot Com
Line array speaker wiring diagram. Image of the rear of a home stereo receiveramplifier. Wiring a line array. The question of how to wire the drivers in a vertical line array has been asked of me so many times ive decided to explain and show the scheme here. To make a four speaker 8ω cabinet put four 8ω speakers in series parallel. Line array cabinets depending on brandmodeletc are either bi amp or tri amp only. Speaker wiring is a simple process that often gets complicated when trying to visualize the wiring configuration.
Here is a link to the wiring diagram as a pdf file. It does a couple things for you. Also attempting to wire two 8 ohm speakers in parallel to an 8 ohm stereo would have the same effect. Mono stereo cabinets the diagram below shows the wiring of a marshall 2x12 speaker cab having a monostereo selection switch and two specialized input jacks. A home stereo for example may often list 6 16 ohms as being ok for use. Wiring it all together and final assembly.
Look at the wiring diagram. Figure 3 2 shows the wiring diagram. First one needs to know the nominal impedance to the drivers forming the array. An easy solution is to draw out a diagram to avoid confusion. This tool handles that part for you. First it allows each individual driver to use less power thus in theory minimizing distortion as the driver does not have to work as hard.
Some have 8ohm drivers more mids and highs. Multiple amps or amplifier channels are used to drive each individual speaker cabinet or group of cabinets in the array for mids and highs. The other arrangement with four groups of six drivers in series would yield a net impedance of 12 ohms which i decided was just too high. Speakers can be wired in series parallel or series parallel to obtain the correct impedance to match your amp. A line array is a group of audio drivers speakers mounted in a row. Mcla wiring diagrampdf.
The mcla wiring diagram for 24 drivers. We are wiring four drivers. When the monostereo switch is set to mono the two 8ω speakers are wired either in series making a 16ω cab or in parallel making a 4ω cab.