Just switched on my 1001rbii and neo 2x12 setup for the first time since the last gig (Tuesday); the attenuator for the horn and the biamp tweeter volume DO NOT work. I accidently let someone use my cab with the GK 4 conductor cable and left the cab in bi amp mode. The cable itself is fine I just checked it out with a little tester unit. I know I have damaged the unit in some way... What exactly have I done to the horn? Is it blown? It still produces a tiny bit of volume but it appears to be at a fixed level of attenuation. Please help me out guys.