Old amp out, 4-channel in. The RCA converter was removed as the amp had a high level input and there was no room for an extra converter behind the Sony. Fronts had a channel each and the rear (running the sub) was bridged across the last 2. This enables me to control the sub level through the Sony, turning down when I have small guests and up when the mood takes me. While running the cables, I had a mad 5 minutes and removed all the rear interior. I sound deadened the rear quarters and boot floor, and stuffed with acoustic foam and felt, all of which will prevent road noise and bass vibrations.
Time for the box. I wanted to still be able to use the boot so I went for a side mount. The side of the mk7 boot is flat so there was no need for a custom fibreglass box, an MDF structure cut to fit the depth of the boot would do the trick.
The inside was filled with foam to increase the volume and made airtight with bathroom sealant. Acoustic cloth ordered for trimming to match the boot, should be here next week.
The amp powered up with no issues and because it only has basic settings (hi/low/full crossover ranges and bass boost) it didn't take much fiddling to have the fronts and sub working together. The Sony was set to full front/half rear which gives me the option of more or less bass, or sub off just by adjusting the balance. Across all types of music the system performed very well giving its limits, the only vibrations were from the actual door trims. I would imagine I need something between the trim and inner panel to stop movement, or turn the stereo up louder lol!