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Old 11-01-2010, 12:53 AM   #1
Orion329
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DIY: 6.5" Rear Deck Speaker Mounting Revisited

My previous rear mounting can be seen here. At the time I didn't even know how to remove the rear deck trim. I can't drop all my speakers in to the new baby until I have more time. For now, my 2-ohm Infinity Kappa 60.9cs woofers run nicely on the stock amp.


Goals:

1. Take advantage of the very solid sheet metal of the rear deck.
2. Use a material that would hold up against the heaviest vibrations.
3. Isolate underside of speaker to avoid any sound cancellation.


Parts:
2x 6" PVC Caps ($10)
2x L-brackets, four packs ($6)
6x 4mm machine screws (~$2)

Tools:
dremel
cordless drill
misc drill bits
4mm tap
socket set
needle-nosed pliers
standard pliers
phillips screwdriver
Sharpie marker
ruler


Install:

1. Remove entire rear trim, headrests, C-pillars, etc. Use the attached PDF of the OEM electric sun blind retrofit guide if you get stuck.
2. Pull back rear deck insulation to expose the black-rubber-lined rear deck metal.
3. Find center of PVC caps, dremel away a slightly larger than 5" diameter circle--depends in your speaker, check your specs.
4. Ensure speaker fits and mark and pre-drill mounting holes.
5. Cut away approximately half PVC caps' height.
6. Remove a portion of the PVC caps to let them lay level. Takes a while...
7. Find the three areas you can put the L-brackets, mark the PVC, and attach.
8. Set PVC cap back in and mark rear deck metal for drilling.
9. Drill into rear deck metal and tap screw holes with 4mm tap.
10. Attach speaker to mount, attach existing wiring to speaker, attach mount to rear deck. Do it for the other side too.
11. Remove enough rear deck insulation to let it lay back down on the deck.
12. Check speakers connection and listen for rattles at high volume.
13. Put it back together the way you pull it apart (after testing speakers and checking for rattles first.
14. Enjoy your sweet rear-deck woofers and grab a cold one.


Thoughts:

- PVC of this size is super-thick, get a 5" hole saw and a grinder with a cutoff wheel if possible.

- I had Dynamat, but chose not to use it, the speaker mounts weren't vibrating, the rear deck rubber lining worked to dampen vibrations, and the speaker to PVC cap screws held it super-strong. Use it at your discretion.

- This method is not easy, if you're looking for a quick install, try my other method or buy an adapter ring.

- My speakers put out tons of bass by using this method. Not an ounce of power was lost in dissipated vibrations to the rear deck as they had been before. I believe that they were audibly making more bass in the cabin over the H/K 'subs' in the trunk.

- I'm tempted to possibly apply this method to the front doors since my old MDF rings started expanding due to moisture (didn't seal them up). I'll look in to it come this winter.

Feel free to post some comments and give me feedback.
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Old 11-01-2010, 01:14 AM   #2
Darkoz
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Nice job, I recently replaced all my speakers with Infinities as well, great speakers and would highly recommend them.
I simply utilised the existing OEM speaker basket which I think would give you similar results although I like the use of the PVC pipe for a neat and tight finish.
This method might be especially good for the front speakers to give that hard to find bass in the doors
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Old 11-11-2010, 11:23 PM   #3
magnuzza
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Great DIY!
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Old 11-12-2010, 01:03 AM   #4
Orion329
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thanks magnuzza.

hope this helps a few people at least get inspired to avoid simply throwing speaker adapter brackets in the loose rear deck.
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Old 12-03-2010, 05:00 AM   #5
Darkoz
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Thanks for sharing the info Orion329
I'm thinking of picking up the PVC pipe tomorrow to have a crack at doing the same, can you tell us if the difference in sound with this method was noticably better than your first method of mounting the speakers with the MDF rings?
Since you've already done this do you think there's enough room to mount the L brackets to the inside of the pipe and then screw it into the frame reaching inside the pipe, saving the need to remove the rear deck.
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Old 12-03-2010, 10:44 AM   #6
Orion329
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cool.

glad you're going to give it a try.

i'm skeptical you could get the PVC caps through the rear deck openings and be able to cut away some of the insulation material. it was annoying to remove the rear deck, but ultimately a lot easer to get the brackets installed. i never had my own amp installed with this set up so i wasn't able to power them with anything but the stock HK amp. i do believe that it's a much better solution since when i did the brackets beforehand, i was getting very visible movement in the back, outside of the speaker itself, and with the new installation there was absolutely no movement. in my mind it was successful.
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Old 12-03-2010, 10:48 AM   #7
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Great job i wonder will this work for a coupe
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Old 12-03-2010, 11:26 AM   #8
Orion329
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i don't see why not... but have no direct experience to confirm that.
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Old 12-03-2010, 09:37 PM   #9
Darkoz
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Quote:
Originally Posted by Orion329 View Post
cool.

glad you're going to give it a try.

i'm skeptical you could get the PVC caps through the rear deck openings and be able to cut away some of the insulation material. it was annoying to remove the rear deck, but ultimately a lot easer to get the brackets installed. i never had my own amp installed with this set up so i wasn't able to power them with anything but the stock HK amp. i do believe that it's a much better solution since when i did the brackets beforehand, i was getting very visible movement in the back, outside of the speaker itself, and with the new installation there was absolutely no movement. in my mind it was successful.
You're right, after getting the PVC pipe I can see that there's no way it'll fit through the rear deck speaker opening without taking the rear deck out first.
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