The three channel transformer has three secondary coil windings, while the two channel transformer has two. One coil winding for each subsequent channel. Thus, the bigger transformer.
#94107 - 03/31/1409:36 AMRe: 7500 transformers and channels
[Re: adam2434]
gonk
Desperado
Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
Have you calibrated the system yet? If not, that would explain why some channels are louder than others. If you have, you may want to re-visit the calibration.