Nice work. Please excuse my noobness here but can you explain "as part of an Add-A-Sub package for Premium Sound harman/kardon systems"
Does the factory amp on the HK system have an output for an extra sub or are you just saying 'if you want to add an extra sub (w/ another amp)'
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2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
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