[justanotherx3]

Originally Posted by Alex the crazy g01 owner

Wow, those tw5 dont need alot of enclosure space. My sundowns each have a separate 1 cubic foot of space for all 4 subs. Im surprised they managed to squeeze two of them under the floor

4 SA-12s?? Super jealous. If I could get away with that size box I'd do it in a heart beat.

[Alex C.]

Originally Posted by justanotherx3

4 SA-12s?? Super jealous. If I could get away with that size box I'd do it in a heart beat.

The box doesn’t take up much trunk space actually. Its custom built for my x3. 4 10inch ported box walled(think 4 separate boxes put together). Each cavity is 1-1.2cu ft accounting port and woofer displacement. Box is tuned to 33hz. 4 sundown ev3 10 with final 2ohm impedance. Im running them off a Audiocontrol Lc1.1500. 1500rms at 2ohm. Subs rated for 2000rms. I believe I had the box built for about $350. Also my installer had carpet that match perfect with the gray bmw carpet so thats a plus.

[Alias1431]

Does this make your interior rattle?

[pierreye]

That will make your whole body rattle!

[Alex C.]

Originally Posted by Alias1431

Does this make your interior rattle?

Yes everything shakes. Just the moonroof rattle though since I sound deadened the car. And Ive been told by my friends they can hear me down the street even when my windows are up.

[justanotherx3]

Originally Posted by Alex the crazy g01 owner

Yes everything shakes. Just the moonroof rattle though since I sound deadened the car. And Ive been told by my friends they can hear me down the street even when my windows are up.

Did you sound deaden all the doors or just the trunk?

[Alex C.]

Originally Posted by justanotherx3

Did you sound deaden all the doors or just the trunk?

Three layers of dynamat on the inside of the rear tailgate. Two layers of dynamat on the rear plate and a border of butyl rubber rope around the inside edge of plate. Also foam tape on the plate frame and red loctite on the plate holder to rear gate and loctite on all 4 plate bolts. Trust me the loctite was needed. At first I somehow managed to lose a screw before I did loctite. Even though I still had 4 bolts holding the plate on the plate mount. Doors didnt need any sound deadening. They are very dead from factory. I did do the foam circles behind the door drivers though. I also dropped the rear headliner to sound deaden up there too but its not worth the hassle. I didnt notice a difference and now my rear headliner doesnt seat up correctly with the tailgate gasket. Hope this helps

[justanotherx3]

Originally Posted by Alex the crazy g01 owner

Three layers of dynamat on the inside of the rear tailgate. Two layers of dynamat on the rear plate and a border of butyl rubber rope around the inside edge of plate. Also foam tape on the plate frame and red loctite on the plate holder to rear gate and loctite on all 4 plate bolts. Trust me the loctite was needed. At first I somehow managed to lose a screw before I did loctite. Even though I still had 4 bolts holding the plate on the plate mount. Doors didnt need any sound deadening. They are very dead from factory. I did do the foam circles behind the door drivers though. I also dropped the rear headliner to sound deaden up there too but its not worth the hassle. I didnt notice a difference and now my rear headliner doesnt seat up correctly with the tailgate gasket. Hope this helps

Super helpful. The shop I'm working with left it open as an option to deaden all the doors, I chose not to. But the trunk area will be deadened (not sure what material they're using). They've only worked on 2018 and below models, having a tougher than expected time on mine but it should be done tonight... fingers crossed it isn't a rattle box

[Alex C.]

Originally Posted by justanotherx3

Super helpful. The shop I'm working with left it open as an option to deaden all the doors, I chose not to. But the trunk area will be deadened (not sure what material they're using). They've only worked on 2018 and below models, having a tougher than expected time on mine but it should be done tonight... fingers crossed it isn't a rattle box

I did mine myself and I have to say bmw really makes taking the car apart very easy. Its all built really solid too. I came from a 2017 honda crv and I swear it was easier to do a sound system in my 2019 x3. Really the most important to sound deaden is the tailgate IF you have a massive sub box. Two tw5 I would put a layer just in case but im not too sure how much it would rattle being a sealed box and under the floor. Fyi the floor latch will need a small piece of foam tape under it as that does rattle loudly. Basically a 2inch piece of 1/8thick foam tape under the floor handle will be perfect

[justanotherx3]

Just got the car back and it sounds astonishing. Ended up with a Kenwood Excelon Amp for the subs instead of the JL, and added two Morel 9" for the under seats. The Morel Hybrid 402s have a ridiculous amount of clarity, it's hard to believe it. Even at maximum volume.

Bass-wise, the TW5s sound really really good. Fast hitting, clear - as good as my IDQ back in the day. Output-wise I have no complaints. Obviously not going to win SPL competitions and not even a fraction of the SA-12s the shop installer demonstrated, but you'd have a hard time knowing these are shallow mount. No rattles except the damned sunroof... I'll have to figure that one out.

They did an amazing job of hiding everything. They made a custom amp mount for the Helix amp/DSP, keeping the factory amp behind it. Wife couldn't tell anything had been done to the car until I cranked the stereo up.

Excuse the dust - pics taken before detailing:

[pierreye]

Which Morel 9" sub they used for underseat? Very neat and clean installation.

[justanotherx3]

Originally Posted by pierreye

Which Morel 9" sub they used for underseat? Very neat and clean installation.

Thanks - I think they did a great job.

The underseats are the Morel ADMW 9"s. I definitely hear a difference from the stock underseats, but the change in the door and tweeters are much more noticeable. I think they had to make custom brackets for Morels but I'm not sure. They were a little worried about them being ported (see the stock underseat subwoofer enclosure attached) but it ended up being fine.

[pierreye]

My understanding is the sub enclosure is not actually ported. The opening is supposed to connect to the side cavity giving a total of around 0.7 cuft. But I think that's the measurement for F30.

[Alex C.]

Originally Posted by justanotherx3

Just got the car back and it sounds astonishing. Ended up with a Kenwood Excelon Amp for the subs instead of the JL, and added two Morel 9" for the under seats. The Morel Hybrid 402s have a ridiculous amount of clarity, it's hard to believe it. Even at maximum volume.

Bass-wise, the TW5s sound really really good. Fast hitting, clear - as good as my IDQ back in the day. Output-wise I have no complaints. Obviously not going to win SPL competitions and not even a fraction of the SA-12s the shop installer demonstrated, but you'd have a hard time knowing these are shallow mount. No rattles except the damned sunroof... I'll have to figure that one out.

They did an amazing job of hiding everything. They made a custom amp mount for the Helix amp/DSP, keeping the factory amp behind it. Wife couldn't tell anything had been done to the car until I cranked the stereo up.

Excuse the dust - pics taken before detailing:

Look awesome! And yes the damned sunroof. Let me know if you have a fix for that I've tired everything from putting foam tape between the seals of the sunroof. I think I pinpointed the loudest rattle coming from above the drivers seat. Its the wind guard the pops up when you open the sunroof. I put foam tape under the plastic bit when compressing the mesh thing that pops up. It helped a but but its mainly the glass rattling at the seam where the two glass panels meet.

[spta97]

Originally Posted by justanotherx3

Thanks - I think they did a great job.

The underseats are the Morel ADMW 9"s. I definitely hear a difference from the stock underseats, but the change in the door and tweeters are much more noticeable. I think they had to make custom brackets for Morels but I'm not sure. They were a little worried about them being ported (see the stock underseat subwoofer enclosure attached) but it ended up being fine.

Justanotherx3 - Do you happen to have more detailed pics of the amp mount?

I'm trying to find the best place for my sub amp but I'm not sure if I have the room you do (X3MC with spare tire).

Thanks!

[justanotherx3]

Originally Posted by spta97

Justanotherx3 - Do you happen to have more detailed pics of the amp mount?

I'm trying to find the best place for my sub amp but I'm not sure if I have the room you do (X3MC with spare tire).

Thanks!

Hey - unfortunately I don't, and not really sure how to take a better pic but I'll try tomorrow.

The audio shop made a custom mount where the original factory amp is on one side (that's why you can't see in pic, it's on the other side of the Helix) and Helix is on the side you can see.

My subwoofer amp is in the spare tire well.

[spta97]

Originally Posted by justanotherx3

Hey - unfortunately I don't, and not really sure how to take a better pic but I'll try tomorrow.

The audio shop made a custom mount where the original factory amp is on one side (that's why you can't see in pic, it's on the other side of the Helix) and Helix is on the side you can see.

My subwoofer amp is in the spare tire well.

Much appreciated! I stopped by Lowes and got a metal plate. I think I have less room than you do but I think I can just squeeze it in.

My plan is to make a cardboard template, then hit the sheet metal with a metal blade in my circular saw (made for cutting metal), then try and make some curves with the angle grinder. We'll see how that goes

Out of curiosity, what type of hardware did they use to mount the amp? Sheet metal screws or nuts and bolts?

[spta97]

I spent the better part of the day making the sheet metal mount. I think it turned out well - I painted it black so waiting for it to dry.