That's the best way I can describe it. Ok I first noticed this when watching LOTR. I had watched it a couple times previously with no problems. So I am watching the last hour of it at lower levels than I have listened to it at when I notice a sort of crackling noise. Like something is garbled in the bass. I figure something is rattling so I don't worry about it. I'm watch Blade 2 last night at low levels and it's doing the same thing. It's not every bass scene, just some. In fact the low bass still plays clean but the higher bass makes crackling or popping sounds. Does anyone know what the problem could be? I'm guessing that it has something to do with the driver. I have a custom built sub from acoustic-visions with an Adire Shiva driver. Any help is appreciated and I would be happy to provide more info if I can. edit: I ran the LFE frequency sweep from Avia to make sure that it was the subwoofer that was the problem. It was never completely consistent in the distortion on the upper bass, but the low bass never distorted or crackled. Sorry for the lack of technical terms.