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No. EAS uses different voltages and has a different topology than 100-volt systems, although EAS can be used in most cases where 100-volt systems would typically be deployed. EAS is a high-fidelity alternative to 100-volt systems and has in many cases been a direct replacement in refit projects where better sound quality was the goal.
For more information, check out An Introduction to EAS.
Yes. We have never had any noticeable side-effects of running cables close to power cables, running side-by-side.
Although the system is not made specifically for highly humid, marine, or outside use, EAS systems are live in open-air installations, on-board boats, and in saunas where both saltwater and high humidity levels could pose problems. Modules are simply placed in protective enclosures, inside the boat, and outside the main sauna area while speaker wire to weatherproof speakers does the dirty work.
More than thinking about the distance between each module, you should consider the total length of a single bus. There are live systems where a single bus spans upwards toward 200 m (650 ft) without problems. The only thing you should be concerned about is the voltage drop, but even that could be handled by having an EAS-PI-3 power inserter somewhere on the bus line before it drops too low.
The issue is normally to decide between the 220 or 110-watt 24-volt power supply, or the 90 or 45-watt 15-volt power supply.
Speaking of 15 volts, you’re normally good with 45 watts unless using an EAS-SYSCON-12 with multiple busses. If you still want to make sure, simply add up the power consumption of all your modules on your bus, found on their respective datasheets. Then add a safety margin of 20-30%.
When it comes to 24 volts, how many watts you need depends on how many 24-volt amps are connected to the node. A maximum of six EAS-24-AMP-30Ds per 110 watts of power supply is a good rule of thumb.