depending on wiring man,and what your amp can handle. get an amps, then wire the speakers to the lowest the amp can handle.
With a 4 channel amp he should be looking at one for one meaning each speaker has it's own channel.
He could split the input (from the head unit to the amp) and I doubt it would make any difference since the amp, and not the head unit, would be loaded by the speakers.
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1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires. Marlin rear bumper & sliders. FROR front bumper. SAS with Alcan springs & Rancho 9000XL shocks. Budbuilt Bolt-on traction bar. Custom Interior Cage by Those Guys Rod and Customs.
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