Hi guys, I'm using an MS309W sub as part of my home cinema set up. I've noticed when watching movies that the seems to be a slight rattling noise coming from the cone. I don't think its blown because its very subtle and sound from the sub is rich and loud. Also, if I push against the outer rim of the cone on the front of the sub the noise goes away. Its almost as though the cone is ever so slightly loose. I've tried very gently pushing the cone back wards when turned off and there is no scraping or anything which is why I don't think the speaker is broken. Any ideas?