Speaker Wiring Help Needed

[Bernie]

Hi All,

I just picked up a 4 x 10 Blue Angel and was looking things over and was wondering how the speakers are wired (see picture below.) The amp has 4, 8, and 16 ohm outputs. Currently the plug is in the 4 ohm jack. The manual basically states "Feel free to experiment with speaker jacks, trying different loads." I'm not savvy about this stuff and I don't know if the previous owner experimented, as per the manual suggestion. I've downloaded pictures that show the plug in the 4 ohm jack and the 8 ohm jack.

Based on the wiring diagram below, what's the safest jack to use - 4, 8, or 16? The wires coming out of the jack are black and white, so I used those colors in the diagram. The speaker connections are unlabeled, but I'm assuming black is ground. You may have to click the enlarge picture bar to see the picture more clearly. Any help is appreciated.

Thanks!

[RodeoTex]

It looks to me like it is wired in a series/parallel configuration with Rt=8 ohms.

Edited to add:
I assume the speakers are wired this way from the factory so phasing is probably correct but if you've changed any of the wiring it may be a good idea to do the old battery test:
Take a C or D cell and touch the final wires to the battery terminals. All cones should be popping the same direction. If one if backwards just swap the wires on that speaker.

Speakers don't really care about polarity per se, just in relation to the other speckers.

[xStonr]

Looks like 8 ohm.