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That sucks to see! Good luck with getting it fixed. It seems that they say every problem that pops up is not warranty related and they find anyway they can to wash their hands from fixing things.

Thought I would share if anyone was interested, the internal HDD located in the car has a 20GB capacity. You will get more storage with a microSD card as mentioned above.

Sound Check #3: Keep in mind that this test and all the others above are primitive sound checks but they are still good for basic testing. Next test was to see how the subs sounded with strictly bass notes playing and no other input. I didn't adjust any of the EQ or sound settings. I left...

I was just exploring, as I'm not 100% satisfied with the sub sound. My previous sound comparison was the M4 and that sounded amazing when compared to this system. Since they're both essentially BMW products, I was expecting the same result as the M4. It is definitely a night/day difference...

Sound Dampening / Foam: A few people have mentioned rattles/vibrations from the back area. I have not experienced this but I was ready to lay some down where I thought it might be needed. I had several sheets of sound dampening pads, tesa tape, and jute material ready to go. As I took...

Sound Check #2: Ported vs Sealed? After the damping Test #1, I wanted to see what would happen if the subwoofer box was sealed. I decided to block off the open port directly below the subwoofer housing. I used multiple layers of painters tape in a cross weave pattern to accomplish this. By...

Sound Check 1: I ran a few tests to see what kind of results I would get. I originally wanted to stuff the subwoofer box with polyfill to try to adjust the "Q" Factor. But this could not be done due to the large hole in the bottom of the subwoofer box. So I compromised and decided to fill...

Subs Stuff: Effectively the subs are ported and use the sheet metal chamber as the port. The air is pushed down from the bottom of the sub through the large opening in the sub box (red arrow). The air then goes into the elongated chamber (yellow bar) and then is vented out of the three oval...

Sub info: These are 8 Ohm subs. I measured 7.3 on one and 7.5 on the other. I would assume that they are wired in Parallel to give the system an effective 4 Ohm load.

More sub facts: The bottom of the subwoofer enclosure is open. There is a strip of green tubing that goes around the outside edge. This tubing gets compressed when you place the speaker down on the sheet metal of the car. This compression gives you an air tight seal. Some people have...

What I found out about the subs: The subs are Harman Kardon. The model number, build date, and BMW Part number is listed on the orange decal. So if your looking for an OE replacement, you can simply shop around using the BMW Part number. Odds are this will be cheaper than someone...

Thought I would start a thread discussing only the subs. The other thread has too many pages and stuff is getting buried and mixed in. So chime in on anything you want to discuss about them. I spent all day messing around with them and thought I would share my findings. Since there isn't a...

tadda, I totally agree with your thoughts mentioned above. My reference perspective is a little different as I keep comparing it to the BMW M4. It had actually had a nice system in it for OE. My expectations was that the A90 would sound similar to the M4 but was sadly dissapointed when I...

I'm pulling everything apart but got to a part that I'm stuck on. Can someone chime in with some guidance? The sub baffle panel has two bolts behind the center console/arm rest area (#12 in earlier diagram from post #70). I can not see those bolts at all. I've already removed the cup holder...

That was my thoughts too. I feel the cover could possibly be restricting the air flow. My biggest concern with the port is that I believe they ported the box to help with the fake exhaust "rumble" notes that are pumped through the speakers. They were using the port to create the Active Sound...

Did you play any music with the back cover off? How did it affect the sound quality? That cover has insulation padding right over those ports so I wondered what type of difference it made with it on vs off? I doubt the holes are used to tune the subs frequencies, that's more of the port...

Interesting find. If they are ported, you can definitely play with the port to tune it to different frequency responses. I'll try to post up what I find when I get them removed. My plan was to stuff them with polyfill and to dynamat the subbox and other areas.

jopfer, I appreciate the feedback! I plan to take everything all apart this weekend and wanted to make sure I had everything setup correctly. Thanks!

Questions to remove the sub enclosures: 1) To access (#12) it looks like the center console will need to be removed. Is the center console clipped in? Or are there screws there to look for in that area too? 2) To access (#10) it looks like we will need to remove the door sill trim. Did...

Isn't this the wing? It's for the M4 GTS. Vorsteiner V-RS GTS-V Aero Wing Blade Carbon Fiber Pre-preg 2X2 Glossy BMW M4 15-20. I gotta say that I'm a fan of it! On Sale: $1800...