not really, this is a shuttle sized weapon system, thus this is a basically a Type S-Va Puilse Phaser cannon. and to put it in terms, a S-XV would be equivilent to the damage produced by the defiants Type V's.

plus this is in the TMP era, where weapons designations were different than what TNG on said they were, these would be smaller versions of the Miranda class's Pulse Phaser cannons.

 :vaporize: Memory Alpha cotraticts and is wrong so often, I don't trust it with out checking other sorces, same with memory-Beta. these are easily changed by users, so don't put a lot of faith into every article.

try here, scroll to bottom and read armaments and then tell me I'm wrong with the site ;) http://memory-alpha.org/en/wiki/Miranda_class

either way, the official Miranda plans show it with 2 Phaser cannons mointed on the joint to the roll bar.

which can be found on this diagram:

http://www.cygnus-x1.net/links/lcars/blueprints/miranda-class-cruiser-sheet-5.jpg

and the full diagrams, unfortunatly the one that labels #14 isn't a thumbnail:

http://www.cygnus-x1.net/links/lcars/miranda-class-cruiser.php

sorry to burst the bubble of your Canon instincts, but some of us do do our own research ;)