Was going to purchase a sub but have been put off by reading threads refering to 'crossovers' and other techy jargon. I have an onkyo 595 amp with mission m71 floorstanders as fronts. A tannoy mxc and M72 rears. I do want to buy a sub but would appreciate an idiots guide to a reccomedation of a sub which would sit nicely with my set up at around the £350 mark and easy install instruction in relation to connections and info on crossover and frequencies etc. Many thanks.