Hi CarAudio fans. I'm hoping you can look at some of these pics and give any comments or advice to make my results better.
I'll use this sticky list to get the particulars out of the way.
Vehicle : 93 Mazda RX7 with '01 Z28 LS1 engine and 6 speed trans.
Location in the vehicle: Kick panels
Space available (Length x Width x Height): almost 4" depth
Subwoofer make and model: Adire Extremis 6.4
Subwoofer Size: 7"
Number of Subwoofers: one per side
Type of Port (Kerfed, Slot, Aero, etc.): Free Air
What type of music do you like?: news talk
Is your goal SPL or Everyday Music?: Louder than a 110 LSA cam and headers
Tuning Freq (Hz): 45Hz natural roll-off plus cabin gain
Volume : Exceed VaS
Questions: Bracing and adhesives
Around 5 years ago I got some Adire Extremis from CSS, NoS after Dan Wiggins closed Adire, the rare 4ohm version. They sat on a shelf while I got the engine swap sorted out and made other upgrades. They are too deep to go in the doors without hitting the glass or "podding out" and my foot already hits the door grill when exiting the car.
Kick panel mounting seemed to be the answer so I worker on "Pruning" the wiring behind my kick panels. This does not apply to most FD (93 thru 01 RX7 body style) but my PCM is under the passenger carpet in front of the seat with a extended harness, Much of what was behind the passenger kick panel was not in use. Pruning the driver side was much harder. The attached pics tell the story. I have attached one pic showing the opening to the A pillar and the area in the rocker panel. I hope this gives enough air space to exceed Vas and let the woofer go free air.
My enclosure takes in this opening into the A pillar. There is a large hole above this opening to allow the door harness to pass thru so I made 20ga plates from a old computer case to seal the hole but allow the harness to pass thru to the door. I hope this eliminates back wave cancelation but I have not sealed the plates yet.
I used 3/8" MDF to make the top, front and baffle. The cars sheet metal forms the rest of the enclosure. The top (roof) of the enclosure is in place. I used bondo/glass to fill gaps between the MDF and body and give a bit of support. I then attached a aluminum L-bracket to a slice of 3/4" MDF to catch the body stud and glued to the top of the enclosure with wood glue. It's solid !
Since I snapped these pics I have made steel straps to attach the baffle to a 10mm threaded hole under the baffle closer to the floor. I would like to rely on wood glue and bondo/glass to attach and seal the baffle to the car and enclosure.
The Extremis will receive 200 wpc from a Avionixx 800.2 and I wonder how much I should strengthen the baffle ? Will the baffle stay sealed and leak-free with how I plan to attach it ? Will it flex ? Will that hurt me ? Should I back it with wood to give the screws something to bite into or is MDF enough ? Do I need holofil ? Should I caulk or Peel&Seal over the bondo/glass ?