My 1987 Porsche 928 S4, 5 speed

 

AMPLIFIER RACK

 

My requirement is to keep my spare in place.  To that the rack must fit over the spare tire and needs to be easily removable to access the spare.  The rack must fit three amplifiers, active cross-over and all interconnects.  Therefore is it two-deck design, with as light construction as possible.   This to make possible to remove it without excessive force, to access the spare.

 

Rack Components

  • Two decks are built using 1/4" plywood

  • support walls are build of 1/2" birch

  • Lower deck box (shown below on the right) is us3ed for subwoofer amplifier and remote relay6 control, and

  • upper deck is use for everything else.

  • The spacers on the upper deck (shown below on the left) are used to provide flush mounting of all components against top deck bezel.

  • Top deck bezel rests on four supports and is attached using Cumlocks.

 

 

 

 

 

Lower Deck

  • Houses 300 Watts ESX monoblock amp for Alianter 12 subwoofer, and

  • Remote relay interface for feeding head unit signal to four boxes (three amps and one active cross over)

  • Audio Control cross-over only needed in my case since my rear fill amp did not have high pass cross-over built in - however Audio Control cross over gives me some additional wave" controls amp would not have).

 

 

 

 

Upper Deck

  • All interconnects and cables are Stinger

  • Main power is fed via Gauge 4, and distributed power  via Gauge 8.

 

 

 

 

 

 

 

 

Rack With Both Decks And Bezel

  • Bezel is made of 1/4" plywood,

  • Top surface is covered with bondo, primed, sanded and painted with flat black acrylic paint.

  • It is reinforced with aluminum angles,

  • It is attached with Camlocks to the upper deck.

 

 

 

 

 

 

 

 

Attachment Method

  • Rack rests on the spare rim,

  • Lower deck uses two brackets for spare cover as right side attachment, and

  • Two attachment points on the left side:

    • extended swiveling lever for spare cover attachment as base for a one rivetnut which aligns with a hole in the lower deck for a knob attachment, and

    • rubber vibration insulation with double-sided threaded rods, one for securing into rivetnut in the floor, and opposite aligning with the hole in upper deck for second knob attachment point.

  • To access spare, two knobs need to be undone, and rack may be  lifted and put over folded back seat rest.

 


 
 
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