Does the MRC speaker have a baffle? If not, the sound will be terrible. You need a properly baffled speaker even if you're going to put it into the fuel tank area.
http://www.qsisolutions.com/products/techinfo/revolution/q-revo_install_kato_c44-9w.html
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
Next question is will a 23mm speaker fit?
Just verify that the speaker is 8 ohm. The tsunami manual recommends not using anything lower.
Springfield PA