A high percentage of the rated output levels for amps are at 4 and 8 ohms. I understand that this is done in order to show the how well the output wattage doubles when an 8 ohm load changes to 4. But where does this leave people with 6 ohm speakers (such as myself)? Is is safe to say that all amps can successfully output wattage to 6 ohm speakers at roughly 1/2 of the difference between 8 and 4? For example, an amp with 140W@ 8 ohms and 200W@ 4 ohms = approx 170W@ 6 ohms.