Marble’s VW GTI


  I was itching to add something to my recently purchased 2011 MKVI GTI and had an old Kicker L5 8″ square sub from a previous project car.  Having a degree in mechanical engineering took me into CAD software to start creating.

  I really wanted the sub to perform at its peak which would allow a nice fill to the great factory head unit and speakers as well as provide some low pounding bass for when I want to feel like I’m back in High School. 

  The enclosure is a slot ported design with 1.0 cu ft of volume tuned to 38hz.  With the technical babble you’d think this wasn’t my first custom designed enclosure, however it was.  I had built some “normal” square sub boxes back in High School, but knew nothing of sub woofer specs, design, enclosure requirements, etc.  Not the same case today.



  The sub works well in small sealed enclosures, but vibrates your chest with a large slot ported design. I went for the largest suggested volume (which does not include the displacement of the port) and allows the sub to be powered with 300 watts RMS. So began the search of an amp.


  I am very OCD and being that Kicker also makes amps and amp wiring kits, I stayed with the brand.  Their subs are monsters even in this compact 8″ square solo-con design.  I chose a Kicker DX 250.1, which was bench tested with result of an actual 273 watts RMS power.  I completed the wiring with a Kicker 8 gauge amp wiring kit which included a set of 2 channel RCA cables.







  The factory head unit does not have line outs (RCA) for an amp, so purchased a Fierce Line Out Converter (LOC).  I tapped into the rear speaker level outs on the factory head unit, and mounted this in a convenient location behind the driver’s side fuse panel.  It is securely mounted with access to the gain adjustments for both left and right audio channels.  Most people install these behind their head unit, which I do not understand unless they are not adjustable.  (My apologies that I do not have a pic of this.)  I adjusted the gains on the LOC and tuned the amp, I was more than eager for my first listen and cruise.






  My first custom audio solution was a complete success.  I dug out my first CD that I bought back in 1991 when I got my first “boom box” which I still use today while working in the garage.  I inserted the disc and let track 1 play…The Boomin’ System…thanks LL Cool J!

  Mission complete.