Originally Posted by Nuance
The calculator doesn't specify ohms, though, does it? Or maybe it doesn't matter. I assumed 8 ohms, but perhaps not. If it is 4 ohms then a less powerful amp than we've stated is needed, as amplifiers make less power into 8 ohms. 300 watts into 4 ohms would be something like 150-200 into 8. My post's #'s above was assuming 8 ohm impedance/power ratings. So an amp with 332 watts (I assume into 8 ohms) will hit 105dB with an 88dB sensitive pair of speakers at 12 feet away with no room playing a role in the factor. If you count room gain (2-4 feet from the speaker), it'll only take 167 watts (8 ohms??) to hit 105dB.
EDIT: Just saw your edit, the information below is probably rendered invalid then, although, doesn't ohms just affect the amount of wattage? Wouldn't this calculator still work as long as you provide the 4ohm wattage as opposed to the 8ohm wattage?
To fix my numbers:
The T900, with an 88db, 4ohm sensitivity, powered by 300 watts, can reach a peak of 104.5db away from a wall, and 107.5 near a wall. Assuming you are near a wall, this leaves 22.5db for peaks.
The JTR Triple 12HT at 101db, 4ohm sensitivity, powered by 300 watts, can reach a peak of 117.5db away from a wall, and 120.5 near a wall. Assuming you are near a wall, this leaves 35.5db for peaks.
The JTR Triple 8HT will be -3db.
If 12HT had a sensitivity of 8ohms, the peaks at 220w would be 119.2, just about -1db.