i have a Yamaha RVX777 which is about 3 months old. I bought the Q Acoustics 3000 cinema pack and due to them being new to market, the speakers were shipped then the sub. I set the system up with my old MS308 and everything was great. The new 3070s arrived and I set it up and was really disappointed. The bass seemed quiet and really quite pathetic. I had set the volume to half and set the crossover to AV as per setup instructions. I then noticed a crackling noise (see video) Q3070s crackle pt2Watch this video on YouTube The sub went back and I have waited c 5 weeks for a replacement which arrived today. The sub performs exactly the same, I have adjusted the amp settings so it isn't as wimpy as before but the crackle is still there albeit it is almost a little squelchy now rather than crackly. The supplier (conceptAV) has been great with the first swap and supportive today, they will get Q Acoustics tech support on it, but I wondered if anyone had any thoughts or suggestions on what else I could try or have come across this with either the 1000, 2000 or 3000 series subs. Is this perhaps an issue with having 2 bass cones rather than a single one? My MS308 works 100% into them same amp it's the same lead.....thanks Paul NB there is also a second video where the system volume is higher.