I assume you mean CABINET
are you turning up loud enough? I can imagine that very low listening levels could lead to a perceived 'dull' sound.
have you tried this at normal (whatever that means) rehearsal levels?
Well, this is kind of awkward and even slightly embarrassing.
When the opportunity arose I cranked up the volume a bit more than my usual practice level and whata you know, the "perceived" dull sound as you pointed turned into a crystal clear bliss.
Since the cab is brand new, I didn't have the opportunity to give it a go at louder levels.
I did not imagine that some guitar cabinets needed to be driven a bit harder to achieve their optimal volume operating level.
Thank you so very much for diverting my attention to this small but yet important piece of advice, much appreciated