Matching suggests that the output impedance of the amp is = to that of the speaker. That ain't so, except in ancient transformer coupled low power record decks and such. The amp output impedance to drive 8 ohm speakers is substantially lower than 8 ohms - more like 0.1 or so. This is a nice article if you are interested

The 4/8 ohm mismatch is largely irrelevant unless the amp is going to be driven near its maximum.

Do it Clinton

Stu