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DIY: Replacing Bose Sub in a 2017 Q7

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DIY: Replacing Bose Sub in a 2017 Q7

 
Old 08-10-2017, 09:12 AM
  #1  
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Default DIY: Replacing Bose Sub in a 2017 Q7

Hereís my detailed writeup on swapping the subwoofer in my 2017 Q7. Its not too hard, does require some patience.


This is highly leveraged from other websiteís write ups. I even pinged a batch of those folks and they helped me out a great deal (esp QuaTTrings, thanks!)



Goals:
1. Keep stock look as much as possible; donít tear up my brand new car
2. Cost effective
3. Have options to use a standalone box later; requires a mono amp
Purchases:
1. 1 JL audio 8w3 (8w1 fits w/o no modification)
2. Fosgate R5001xd mono amp,
Amazon Amazon
3. 4 gauge amp kit w/ fuse (I had a previous kit already)
4. mdf ring spacer,
Amazon Amazon
5. mini-add-a-fuse, +10A fuse,
Amazon Amazon
6. sub quick connects,
Amazon Amazon
7. dynamat,
Amazon Amazon
8. polyfill,
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9. Car turn on amp time delay
Amazon Amazon
(perhaps optional)

How-to:
1. Route power from battery to new amp in rear
a. Battery compartment is in the front passenger footwell. This is good and bad. Good, you donít need to route anything thru the firewall and place a grommet. Bad, itís on the other side of the car from the remote lead. Disconnect the negative battery terminal.
b. Connect the power side of the 4 gauge wire to the battery. Add fuse as well (see photo)
c. Route the power wire down the side of the car. You need a decent length wire here. You will need to remove the bottom plastic plates. They are super annoying and you have to get the clips back in just right for a snug fit
d. Take the power wire to the back (3rd row). At this point you need to remove some of the plastic siding on the trunk side to drop the wire in such that it comes out at close to the subwoofer box (back right of the bottom of the trunk). These clips are even more annoying than the bottom plate ones. They are hard to fit right back in. Be patient. Or do what I did, eff it up and ask the dealership to pop it back into place when you take it in
e. Route lead to area under bose amplifier
2. Remove stock subwoofer box
a. In general pretty easy, but there is one pesky screw on the right most edge of the box. It fits under the plastic siding so I had to push against the siding to get it out. Btw, I did not put that screw back in
b. Lift out box
3. Prepare box
a. Remove old crappy sub
b. Disconnect sub wire connecter and put to the side
c. I didnít want to use the existing connecters, so I mount one quick connect on the left hand edge of the box (actually, put it where ever you want/can). Thatís where I put it, but itís hard to get to once you put humpty back together. Perhaps on top somewhere, but couldnít find a flush service. Use on of those wide router bits to bore open a hole, use self-tapping screws to secure. Donít forget to connect a low gauge wire on the inside before mounting it
d. Fill box with poly fill. I just jammed as much as you can into this. honestly, wondering if I could have just bought this **** for .99 cents at Walmart
e. Use dynamat around the whole box. I just covered as much as I could. No, I donít know how much it helped
4. Mount new sub
a. Spray paint the mdf ring black (optional of course), but could look fugly w/o it
b. Once dry, use epoxy or your favorite plastic/mdf bonding material to the top of the sub hole (outer ring)
c. I used clamps to hold this in place as it dried
d. Use self-tapping screws to mount the 8w3 to the ring
e. Donít forget to connect the end of the speaker wires to the sub terminal. Pay attention to positive/negative. Box should now be ready
5. Mount new amp
a. Remove the two wire harnesses for the bose amp.
b. Remove 4 nuts/screws holding the bracket for the amp
c. Lift out of the bracket and mount the amp upside down to the bose amp (I used really long zip ties to hold it in place).
d. Thereís prob a better way to mount this, but I did it this way. Pros Ė it seemed to fit better. Cons Ė hard to get to the gains. I think there was no room to mount it on top (couldnít get the cargo cover to close). I might try it again. There are smaller amps like the alpine mrv
e. Leave the bracket out so you can do all the wire hookups
6. Remote turn on
a. So I have old equipment sitting around, so tried my lci2 audio control box (it has this fancy remote turn on feature). Well, the fancy feature didnít work. So now had to route a remote turn on wire
b. Go to the driver footwell and replace the dead pedal (pesky hex bolt)
c. Use the mini-add-a-fuse to middle section (bottom), sorry would need to look to see the actual number, could add a picture later.
d. Route wire from remote lead to the back. This is like a 14-16 ga wire.
e. Took out bottom plate panels to route from the front to rear, then tucked the wire under the plastic trim until it fed into the back
7. Grounds
a. I had a lot of trouble with the grounds. Spend the time to do it properly
b. I made a small hole in the back (towards bumper)
c. I used a small cup wire brush to remove all the paint (attached to drill)
d. Then I put a ring connector on a 4ga wire and use a self tapping screw (need to drill this)
e. Its hard to get this in, I kept dropping the damn screw into the small bumper well.
f. Did this a few times so used a magnetic tool to fish out the screw each time I dropped it
g. Btw, I ran another smaller 14ga wire with ring connector as well for the time delay ckt
8. Hook all this crap up
a. Run the 4ga gnd/pwr into the amp
b. Run the remote line into the amp
c. Splice the wire (I just removed the sub oem connector altogether to get a good connection) and run those into the fosgate 4-pin connector. It can take bose suib amp outputs as an input. Tie + wires together and Ė wire together
d. Route wire from amp to sub quick connects
9. Turn on pop
a. So after all was installed, I had this annoying boom sound when I turned my car on. Even sometimes start/stop feature would cause a pop. It was unacceptable
b. So I bought this module which delays the amp turn on. It greatly reduced the pop. Still get a little, but is manageable.
c. Iím not 100% sure you need it. When I used this I had the lc2i in there and was using it as a LOC. When I removed it, I kept this module in there
10. Tuning
a. If you are not used to a 8Ē sub, it wonít have the boom of a 10/12 of course. It is pretty fast reacting and has good pop
b. Iíve been playing around with the gains for awhile
c. Once youíve tuned, carefully place the bracket back in place. I didnít actually put the screws/nuts back on for this as I keep dorking with it. Eventually I will, but not all of them will fit as the amp is a little too wide. This was acceptable to me


power connection, fuse holder on the side

dynamat all around, 8w3 mounted

quick connect on LHS of box

spacer in place

power wire routed behind plastic panel in 2nd/3rd row

comparing both woofers. you can also see the nook in the box that prevents taller subs from fitting

quasi-finished product. can add a photo on the amp mount, fuse and the 12w6 wedge configuration later
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Old 08-10-2017, 10:01 AM
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Thats awesome! Im glad you reached out to Alan (Quattrings) he helped me do this in my S7 about a year or so ago, great guy. He lives about an hour north of me so we hang out. Biggest question is how does it sound?????? I noticed a huge difference in my S7 and love it.
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Old 08-10-2017, 06:22 PM
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Yes it does make a big difference. Alan was a huge help, as was your thread
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Old 08-11-2017, 06:40 PM
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Did you see any ports on the enclosure? I ask because if there is a port, then I don't try hard to seal the driver to the enclosure. But if the enclosure is designed to be sealed, then I should maybe use a gasket.
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Old 08-11-2017, 07:02 PM
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Yes the enclosure is ported, not sealed
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Old 08-11-2017, 10:02 PM
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Wow. This looks great.
I would love to do this!

-dt
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Old 08-12-2017, 10:51 AM
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Setup when I need a bit more bass

12w6 pro wedge box
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Old 12-29-2017, 11:57 AM
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Fantastic DIY. Do you know if I could use the JL Audio 8W1 v3-4 in my wife's 2017 Q7 PP without Bose amp? We have stock system without BOSE amp and speakers and I wanted to add a bit more bass without changing the rear of the Audi....

If this would add a modest amount of thump, we might be good with the rest of the system "as is"....

THANKS FOR THE COMMENTS!!
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Old 01-04-2018, 07:45 AM
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Originally Posted by Jim Webber View Post
Fantastic DIY. Do you know if I could use the JL Audio 8W1 v3-4 in my wife's 2017 Q7 PP without Bose amp? We have stock system without BOSE amp and speakers and I wanted to add a bit more bass without changing the rear of the Audi....

If this would add a modest amount of thump, we might be good with the rest of the system "as is"....

THANKS FOR THE COMMENTS!!
I'm not certain of the subwoofer enclosure size in the non-bose setup. i think there was another thread on here where someone upgraded the non-bose setup
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Old 12-09-2018, 12:04 PM
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I have a silly question.....why not just swap out the sub itself and use the existing Bose amp?
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