Here is my problem..........I have a Mojo Diagonal 2x12 loaded with a pair of Weber 1225's. I'm using a Fargen Olde 800. I'm having trouble with fizz and the low end falling apart and getting mushy. This is even at low/moderate volumes.
I'm starting to wonder if it is the nature of the cab..........very much oversized for a 2x12 configuration. Or if I need to try some different speakers.
You have two issues. One is the O/S cab, which promotes more bass response, typically. The other problem is the open back. You can have an O/S cab if it's closed back with M style 1225 speakers, but with the open back AND the extra size it creates too much air for the M's to work with properly. They just can't stay tight with that much air behind them.
I'd suggest the following.
1) Get a closed back panel for your cab.
2) Move to at least one H style (G12H/H75) speaker to tighten up the low end with your cab if you keep the open back.
3) As Rik has pointed out an M75/H75 mix works well with this, but two 1225's in an open back will get hit too hard by your amp's EQ to ever be as tight as you probably need it.
As you can imagine, I've done this testing and had my clients confirm it with their rigs, so these suggestions are based on working solutions. Good luck!
Thanks for the info..........but my cab is already closed back and I still have the problem.
This might help tighten up the bass response, but a G12H is very bright and will only accentuate the "Fizz" problem he's having.....move to a heavy magnet (H75/G12H) speaker type to tighten up the bass response. You could probably do much better with one, but the ultimate would be two H style speakers.
This might help tighten up the bass response, but a G12H is very bright and will only accentuate the "Fizz" problem he's having.
I would suggest tying some Celestion Classic Lead 80's or Vintage 30's (althought the Vintage 30 has a strong upper mid peak, it does have it's highs rolled off quite a bit)