My GT Soul-O 112 extension cab is rated for 8 ohms and I need it to be 16. Would you replace the existing 8 ohm 12" with a 16 ohm 12" or try the Weber Z-Matcher impedance matching device. I think both would come out to around the same amount of money, speaker might be a little more depending on what I'd end up with. The speaker in the cabinet now is the GT designed Celstion (UK) speaker, don't know what a good quality 16 ohm for this cabinet would be. The cabinet can either be sealed or open back and I'd use it either way depending on how my mood was. So the question is new speaker or Weber impedance matcher. Thoughts?