Hey all I've just recently started doing research on my latest wacky idea, my own lightweight combo. I've got an Behringer BLX1200 ultrabass as my starter. My idea is to completely gut it, just so I'm left with an amp chassis and a carpet box. Silicon chip magazine designed a 250w in 8 ohm class d power amp which I intend on building 2 of and bridging, giving me 500w of power into 8 ohms. With the speaker I intend on replacing the 12" aluminum cone driver with an 8 ohm lightweight neodymium speaker that can handle atleast 500 watts rms. At this stage I'm unsure what to do in regards to preamps and what bass driver I should use. Feel free to follow me on my journey.