Answers have been more like guesses in another section so trying here: TSA15H --- Here's a pic of the back panel. The speaker it came with is 8 ohm so it would take the 1 x 8 ohm plug. I have a vintage JBL K120 in a second enclosure which is 8 ohm and may want to gig small rooms with 2 x 12 at times. Since there isn't another 8 ohm female plug back there, where should I plug in the JBL ? Should work anywhere without doing damage - am I right ?