Strapped at .5 they will play daily with the impedance rise. I ran them for several weeks like this.
My electrical consists of 220amp alt, Optima Yellow under hood, 2 Kinetik 2400's, 2 runs of 0.
Amps stay pretty cool. I've never had one overheat or shut down because of thermal failure. Voltage drops to 11.9-12.3 for burps and 12.8-13.5 for daily at full music volume. (I should say this was at the AQ limits so there may be a bigger drop with the lvl 5's.)