Mkiii Targa Top Subwoofer


New Member
Nov 14, 2012
Atlanta, Ga Area
Hey guys,

I've been absent from posting and everything for a while. Graduation/ New job/ Changed job now your all caught up.
Besides the point anyway. I love car audio never quite got into competition, but I've got some pretty good time invested
in the hobby. Anyway I know exactly how I want my music to sound.

Fiigured I'd post my trials, errors etc on here for any others that may be interested


New Member
Nov 14, 2012
Atlanta, Ga Area
Here is my first setup. Very basic but did decent.


1 10'' MTX HX2 in a small 1cuft ported box

Like I said decent.

I wanted more bass and the HX2 is very deep and very heavy for just 1 10''
so I moved on to (2) Atomic Quantum 8's


4.5 inch Mounting depth handles about 500-600rms
I built a 1.5cuft ported box for these guys intending
to tune them down to 33hz. HORRIBLE :3d_frown:
Box Dimensions were off way too much port... Trash

Back to the drawing board
I knew I wanted a bigger sub but didnt want to lose my spare
backseat or have to shimmy the box on top of the back seat
when I have the targa in the back. so I knocked back a few
one night and spent hours searching :beer:

The restrictions
  • Fit targa with sub in place
  • Fit on top or infront of spare
  • no slim mount subs
  • bigger than 10''
  • high sensitivity (louder with lower power)
  • reasonably lightweight
  • small mounting depth
  • content with smaller box
  • Must be able to be wired @ 2ohm

Option You may want to consider:
Sundown SD Series> I own two 10s great subs
Atomic Quantums> I believe they stopped making the 8'' version. GREAT SUBS poor marketing/service
Sundown E series
Old Orion HCCA subs have small mounting depths like 5-6'' I think

Anyway I settled on this:

Boston Acoustics SPG555-2
They dont make these anymore but you can still find em
These subs were made for smaller enclosures, High Sensitivity
high power handling and BIG-ish. :love:

Now to shoehorn that guy in:
1cuft is recommended below are my box plans
Width 31''

I ended up modifying the bottom section deeper to
make up for area I lost to fit inside the spare tire.



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