Ok here is my alpine swd-1600 or something along those lines
Its quite robust so didnt need securing beyond some velcro underneeth which is easily removable but holds the amp still (along with the back of the chair)
the amp wont blow your ears off but is a major improvement over standard 135 system (headunit made another big diff) and is an active sub as opposed to passive. Was easy to install - took me about 45 mins tops.
the amp has a bit that glows on it - but you can see that. it suprisingley easy to adjust from the drivers seat.
And I have no idea why my carpet looks blue?!?