After reading the various DIY Sub threads recently (and browsing some of the WWW sites linked from them) I have a few Q's. The general level of the threads was pitched slightly beyond my current technical knowledge particularly in respect to the electronics/hi-fi side of things. Conversely, my DIY skills are truly awesome and many a wonderous item has been borne from an 8' x 4' sheet of 18mm MDF, a hammer and few choice swear words. With regard to making a sealed unit with onboard amp.... 1. In a nutshell, is the whole DIY Sub thing the harmonious marriage of cabinet volume (in litres sq) + driver + amp? 2. Can anyone suggest a UK online retailer and part/catalogue no. for the input/amplifier/bit with the volume & cutoff knobs on. I'm not entirely sure of the true name for that particular component 3. What does 'flat' refer to in Subwoofer terms? 4. Does the output from the amp unit described in Q2 connect directly to the driver? 5. Once all the tech details are taken into account it all seems fairly straight forward. Is there something that I'm overlooking that would make such a project not so? Thanks in advance.