I am new hear but installed my first system in 92. I use to have a hatchback and always used sealed boxes. I always used a slightly slanted boxes firing up at about 75 degrees and about 5 inches from the back wall (t5 inches is all the space I had left). Always had clean and awsome bass but I've recently installed a couple of 12's in a flat box firing directly at the back at 90 degrees to the rear with less success. My question is, Is it better to have a slanted box for rear firing and what is the best distance from the rear cause my trunk is huge and am currently about 10 inches from the back.

Thanks for your support

CGE

The angle of the baffle isn't going to matter. Subbass wavelengths are far too long for "aiming" to affect the sound.

I've always had the best success with the enclosure pushed all the way against the rear seat, firing towards the rear bumper.

Hatchbacks and trunk cars result in completely different acoustics which will seriously affect the sound. Do not expect a trunk car to have the same results as a hatchback.

try putting your subs up.