I have a 2007 Suzuki Swift and a DUDU7 car stereo with DUDU6 OS running the latest stable public release. When I turn off the car, I hear a "pop" sound coming from the woofers (amplified by a Soundigital amplifier), only when turning it off, not when turning it on. Is there a way to avoid this problem? Until yesterday, I had a crossover connected to the woofers and never had this problem, but now that I removed it from the audio system, this annoying problem has arisen.