I have a new alpine deck 50X4 and Infinity components in the front (6.5) and 2 ways in the rear (5.5). When I turn it up I get a ton of thudding in the speakers during mild base (for example during rock songs when they are hitting it heavy on the base). I’ve never had a problem like this running a stock deck to speakers. I had taken it back in to fix an obviously bad speaker in the passenger side (new speaker blown out of the box, makes me wonder)... They say that this is because I need an amp. The noise defiantly comes from the component speakers. Are they right? Do I need an amp? What should I run? I only have $200 for a 2 channel amp and most I have seen are 50X2 at 4ohms at that range. Think this will be an improvement over my deck AND fix he speaker problem?