Arrgh! Can't resist... must answer...
No, don't do it. Your amp was designed for 8 Ohm impedence, not 4 Ohm. If you hook up the 4 Ohm, you'll draw twice the current from your amp, for the same voltage, which is something it wasn't designed to do. You'll blow the main transistors, and that's half the amp right there.
On the other hand, you might get lucky, if you keep the volume down, but that would defeat your objective... so... Don't do it!
If you want 8 Ohms, you could always hook up those speakers in series, on a single channel. That would work nicely.
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