Hey dallow, since you see to know what you're talking about, perhaps you can help me. I'm trying to narrow a problem with my sub down to either being a faulty receiver, or a faulty sub. Every time I turn on my receiver (The sub uses the power ports on the receiver, so it gets its power from there too), it make a kind of pop noise, and then kinda does some rumbling for a few seconds. Always stops, and works fine, but this happens literally EVERY time I turn it on.