I recently received a bunch of free old school car audio equipment. I can't seem to find any specs on the subs. They are 10" MTX terminator subs the old ones that are all black with Terminator in red on the cone. Can't find anything written on sub itself except this:1ord775 4 ohm 91 9293. So other than knowing that it's 4 ohm I don't know anything about them. Any info helps and thanks in advance.