So after much umming and aaring, I've finally placed an order for a single SI HT15 D4 which Nick recommended over the D2 (“has more output…same size box...lower F3”. I will be going for a sealed cube and have tried to balance size with quality/output and have settled on a 50cm/80l cube. The D2 seems to model fairly well in Unibox: reaching 20hz at 105db and straightening out to 113db at 40hz. Xmax is not reached and the sub will require only 424W. I am waiting to get a response on whether the D4 has any different T/S propertie. The next steps will be to get everything I need ordered: Cube: I will get the 25mm mdf pre-cut with the required (double) baffle and rebate sizes: 14” and 15.5”. I live in a one bed flat so will need to minimise and simplify the construction as much as possible. To join it all up I will order some decent wood glue and screws – but would I need clamps to help keep everything in place? Also, is there a common sense order to start putting it together? For the binding posts I will get some from Maplins. I will be finishing the box with veneer as the fumes from multiple layers of paint would not go down too well! Amplifier I was thinking about an iNuke 3000 DSP (ideally I'd like a Peavey IPR DSP) – but would that be overkill? I may get an additional sub once we finally find a place to move in to. Would I benefit from an anti-mode? My current lounge is 4mx3.6m with an open doorway into the kitchen and large (old single pane sash) windows. Cabling: I haven't researched into this yet so any quick tips/pointers would be appreciated. I'm actually quite excited!