IMO, the usually level headed Jason is wrong here…do not attempt to disassemble the speakers! Newbee is on the right track. This is about room interaction and too much low bass energy when both active woofers are powered up. Try reducing the levels by a lot on both to see if you can get back to the same overall bass performance with both working as you have with one turned up higher. If you succeed with this you should benefit from lower distortion and more uniform response across seating positions.
Weird
I have a pair of GoldenEar Triton 1 speakers, which have built-in subwoofers. Evidently, the right subwoofer lead fell off the speaker some time ago without my knowledge. I’ve been listening for quite a while with only one subwoofer, really enjoying the sound in blissful ignorance. Everything sounded great including pieces with deep bass such as formidable organ recordings.
Today I discovered the plug out of the wall and plugged it back in. The system immediately closed up, became dull, lacking ambiance. I pulled the plug back out. Sound was wonderful. Everything sounded just right, including the bass which was full and rich.
I’m now listening without the right subwoofer for good.
Weird!