Had a return client come in for a full DD Audio system install.  I recently installed a single 12" DD Audio package system into his car, with about 350 watts of power.  It was good enough to get him into the spirit of good sound.  A few months later he's back for more....in a big way.

We kept the 600 watt amp I installed, but we swapped out for (2) two 12" 500 series woofers in a custom made slot ported box.
I replaced the stock speakers (which were factory amplified premium speakers) with DD's CS5.2 and CS6.5 component speakers to provide with crisp, clear sound. Installed the crossovers in the doors and hardwired them back to the new 4 channel DD Audio amplifier.

Originally I installed the 600 watt mono amp on the back seat, but seeing as how the 4 channel amp was the same size, there just wasn't enough room for this to happen.  So, after a few minutes of playing around with location, up under the deck lid was where they both went.
Install was a bit difficult, as in order to get them up there and miss the subwoofer box and the deck lid when it shuts, I had to put them in JUST the right spot.  Now the amps are completely hidden and out of the way, and if the box needs to be removed, you can't even tell the car has an aftermarket system installed......just the way I like it.

Without any sound deadening installed, this system actually sounded amazing....this is DD's entry level system, and I'm more than impressed with it.

Customer will be back for sound deadening and more fire power under the hood (Battery)....but for now, he's one happy customer.

Had a customer bring in a Saturn that already had a nice Alpine Headunit and some aftermarket speakers.....just needed some bump.
Digital Designs 500 package fit them perfectly for what they wanted and their budget.

Digital Designs 500 series 12" woofer placed into a perfectly matched ported enclosure that's finished off with their logo stitched in red, provides just enough bass when it's put on a CM600 amp....this little monoblock pushes plenty of power to this setup and the customer was happy.  Mounted the amp on the back seat and hide the wires the best the car would allow it.

Cheers!