How much louder and deeper is the T or C in a band setting compared to the regular H1203?
The front-firing mid on the Hathor 1203 is theoretically a little bit louder than the front-firing mid on the Changeling 112. This is because I had to keep an eye on the impedance curve so that the Changeling 112 remained an "8 ohm" cab. The difference is a fraction of a decibel.
The Tall versions have 2 dB more output at the 62 Hz first overtone of low-B, but the "regular" height versions are theoretically very slightly louder in the upper bass region (by a small fraction of a dB).
The bands I work with are insane about low stage volume (lots of acoustic instruments and delicate arrangements) so I’m curious how this will fit into the arsenal.
The rear-firing mid in the Changeling cabs starts out about 3 dB quieter than the front-firing mid over most of its spectrum, but it actually goes deeper (is crossed over lower) than the front-firing mid. This is because, around back, we're not getting very much contribution from the top end of the woofer. Then there's a switch which shelves down the rear-firing mid by another 7 dB, and that switch is specifically for situations where stage volume is an issue. With the -7 dB switch engaged, the rear-firing mid's contribution to stage volume will be much less than the already-omnidirectional (or nearly so) lows from the woofer, but I think it will still be useful.
(The "acoustic friendly" version of the Thunderchild cabs, which has been out there for about eight years now, has a rear-firing horn that's about -10 dB relative to the front-firing horn, and no switch. I've been telling people that if they want to turn the rear-firing horn off, to block it off with a piece of tape. To the best of my knowledge nobody has ever found the rear-firing horn on the "acoustic friendly" Thunderchild cabs to be detrimental. The worst report I've gotten on them is that, if the mix is loud, the rear-firing horn gets buried and makes no useful contribution.)
Fortunately you have the Hathor 1203 if it turns out that the Changeling puts out too much stage volume even with the -7 dB switch engaged. I'd be interested in hearing back about which cab is best for that delicate acoustic gig... I
think it would be the Changeling, because it's arguably an "acoustic friendly" version of the Hathor, but we won't know until you try it!