Since upgrading from eggs to Kef Q4 and XQ2C, the tiny sub that came with the egg's seems to be lacking slightly. My room is 4.8m * 3.4m so its not the largest in the world. I'm trying to convince the missus that the SVS would be a good buy, as i have the chance to buy one second hand. Would it really make that much difference that is as noticeable as going from the Egg to XQ2c say, as even she has a smile on her face watching "Robbie" Any idea how much a second hand 2010 would go? It had a new amp board 6 months ago fitted by Kef.