If yo uhave them wired like you did in the H-frame , it is wrong. One will have the wrong polarity (the one that facing rearward in the H-frame). It will not sound "bad", it will just have very little output. The only way you'll get the buzz is if you cross the driver/servo cirucits
Hard to write this but I'll try :
Driver coils:
+ from amp to + 1st driver coil, then to + 2nd driver coilo
- from amp to - 1st driver coil , the to - 2nd driver coil
Servo Coils:
+ from amp to + 1st servo coil
Then from - on 1st coil (above) to + 2nd servo coil
Last, - from amp to - 2nd servo coil
You'll be golden after that !!