Hi, I'm about to buy a Trace Elliot GP12SMX but I realized that there are some differences I hadn't noticed between two amps of this same model. This one has the red stripes and the control panel looks more arranged. This one doesn't have the red stripes but it seems to have a tweeter in the middle of the amp and the control panel looks more relaxed. Can you tell me more differences that aren't visible between these two amps? Thank you and sorry about the Engrish!