I usually think of the DCR I can tolerate in terms of the nominal impedance of the associated drivers. For 8 Ohm systems this is 0.24 Ohms. But it depends on the location in the circuit. You should also try to calculate the dissipation of the L under full power conditions as a sanity check. Or better yet, measure the temperature rise of the inductor over a period of several hours at full power.
Trouble can come from surprising directions when doing that long term full power test.
There IS a safety consideration here, even for home systems that are subject to use at high power. You don't want to go to bed after a long and loud party with inductors smoldering inside your speaker enclosures. Power dissipation is also a compelling reason to use only film type capacitors in our crossovers. Copyright 2001 True Audio, Andersonville, TN USA, All rights reserved.