I'm selling my 4-ohm Eden D212XLT to a friend who has a Hartke 3500 mono head. The back of the head has two speaker outputs labeled 8 ohms. If he hooked up two 8-ohm cabinets to the head, he'd be running at 4 ohms. I'm wondering if he can go ahead and plug the 4-ohm 212 into one of the outputs (with no other cabinets) and operate safely. Seems to me it would be OK, because the amp is designed to operate at 4 ohms, and the two outputs are undoubtedly linked in parallel. Any thoughts?