What I did before, after asking the same question & spending $25 at a stereo shop:
Rear speakers off the head;
Front speakers off a 2x50W amp;
Sub bridged over the same amp;
I kept the bass out of the rear & front speakers with bass blocker capacitors, which were simply rigged inline between the speaker wire & connecting terminal at each speaker, then secured to the magnets to keep them in place.
I also placed a high-frequency-blocking coil at the sub, inline between the enclosure's terminal cup & the sub, and secured to the interior of the box.
No true external crossovers, no head unit frequency distribution tricks, no "tri-way adapters", and it still sounded pretty darned good. I don't know what the true power distribution was between the fronts & sub, but it got loud enough, and sounded pretty balanced.
I wish I still had the actual electrical specifications for the caps & coil, but the frequency cutoffs were listed as 200 Hz for the caps, and 100 Hz for the coil. The wide frequency gap wasn't much of a problem, because the slope of each was about 6 dB/octave. The caps could've probably worked well with a 150 Hz cutoff, too.
I couldn't vary the sub volume, phase, or frequency via any external controls, but like I said, it sounded good, and wasn't a BOOM-centric setup like too many systems tend to be. I'm still considering a similar setup for my EP.
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