This first bit is a typically vague argument -- in that it can be argued using the same facts the *exact* opposite way. Observe...
Once again I cite the fact that ships that were made either within the same era or even after Voyager were seen engaging a single cube and many were lost in that battle (First Contact) this battle took place at a point in time that was approximately two years AFTER Voyager lost contact with the federation,
This is true -- however, it is also true that we don't see an Intrepid class during this battle, yes?
furthermore Voyager's torpedos have NOT been proven to be anything significantly different from those used up till that point.
You can't prove a negative in this manner -- without stated proof, there is no contradiction. Further, you cannot claim that her weapons are not more powerful, when the onscreen evidence indicates they are... ("Sure, I saw the explosion... but nobody told me it happened! So it didn't!")
It was stated in the DS9 and TNG TMs that standard photons have a destructive capability equivalent to 25 isotons theoretically and normally about 18 in actuality. In Voyager the power of the torpedo's was mentioned three times two of which cited the 25 isoton strenght index whereas the one other time was stated by a person who was not part of the crew (seven while she was still a borg) and that was the only time that the 200 isoton strenght was given. We can therefore discount her statement based on the fact that Janeway most likely did not see fit to allow the borg access to entirely correct information regarding her ship's capabilities. If one takes seven's statement as true then the question that must be asked is why is there a quantum torpedo when a Type 6 Photon has between 3-4 times the yield?
What you're saying here is that there's *on screen proof* that Voyager's torpedoes *are* more powerful? Why can you explain away for no reason something that is explicitly stated but *not* explain away what you percieve as a contradiction? If you're willing to "Well... Seven probably meant I was right! She just said the opposite because of conspiracies! And evil!" then why can't you "Well... the Borg in the Delta quadrant may not be as powerful because they weren't expecting to fight humans" or somesuch? The simple fact that you've *made up* an excuse for the show to be wrong shows what it is you're interested in...
Next, all canon evidence shows all federation ships except for the Defiant class and the Soverign class using photon torpedos exclusivly in all confrontations shown.
Then isn't *this* the contradiction? That they'd have more powerful weapons but not use them? Maybe they're using the more powerful type of torpedo that Voyager seems to have...
This has but one exception with the Lakota which was a test-bed for an excelsior refit which was never undertaken en masse (this can be known because the Lakota outwardly looked just like the Enterprise-B excelsior refit, whereas all Excelsiors seen in the Dominion War were the standard model).
We've certainly seen Excelsiors updated before with no visual change as well... the first TNG episode with the Traveler starts off by talking about an Excelsior that just had her engines updated. Is there something in the Federation charter that says ships can upgrade everything but their weapons
?
The akira just like all the other ships (with the above exceptions) has never been shown to fire quantum torpedo's it has only been shown to fire photons.
Lack of evidence is never proof that something doesn't exist -- and it can *especially* never be used to prove that something else *can't* exist.
So we now have evidence that the torpedo's used by both voyager and the extreme majority of federation ships
Actually, even if we ignore the nonsense behind your evidence, it makes no sense. Allow:
* You state that old ships (Excelsiors, Mirandas, etc) cannot have not been upgraded for mystery reason X and therefore still mount older weaponry.
* You state that newer ships in the same era (Defiant, etc.) mount newer, more powerful weapons concurrently (during the same battles).
* You state that Voyager, another newer ship, must mount older weaponry because it existed concurrently with older ships.
This doesn't make sense.
(only know of two soverign's niether of which were ever seen participating in the Dominion War, the two being the USS Soverign and the Enterprise-E, and only know of 4 defiants, possibly three, the 4/3 are the Valiant, the NX Defiant, the USS defiant, and in Call to Arms in the last shot of the episode a defiant is seen in the federation/klingon fleet that the Defiant and Rotaren are joining this defiant COULD be the Valiant or the USS Defiant (prior to recomissioning) or it could be a totally different ship) are of the standard photon variety or perhaps a slightly upgraded model (perhaps utilizing the absolute 25 isoton charge)
Didn't Voyager the Defiant model at least once?
Also the DS9 TM states that the Quantum Torpedo has a 50 isoton yield do to the ZPF explosion and a 21.8 isoton Antimatter explosion which then could equal a theoretical maximum of a 71.8 isoton yield (we do not know how much of the 21.8 isoton yield from the antimatter/matter explosion is expended simply in causing the ZPF explosion.
This equals a yield of between 2-4 times more powerful than the standard photon torpedo which is not the "dozens of times more powerful" than the standard photon that Bhaktadil stated.
I'm not one for numbers, but we should probably get some quotes behind this...