After searching for a bit on the C8 and aftermarket modifications to improve bass response, I have only ran across 2 alternatives (as of yet). One in the passenger foot-well, and the other behind the passenger seat.

I'm curious about replacing the center-rear twiddler and the entire waterfall assembly with a sealed, downfiring sub enclosure (aimed at the engine-bay). If I can repurpose the stock retention clips for this--so much the better. Three questions come to mind:

1. Is the signal for the stock 3.25" going to suffice for a 10" or 12" driver--or is there some HPF that nullifies frequencies in the 10-200hz range?

2 Is there an amplifier in-line with this location that would have to be circumvented (so as not to double-amplify)?

3. Is the power connector for the inductive charger sufficient to be repurposed to supply power to an amplifier for aforementioned sub?

 

having spent 10k on my C7 GS audio upgrade and eventually looking to buy a C8.... was wondering what if any options were available. My JL Audio c7 custom box is insane along with the other speakers I replaced along with a sick amp that powers everything plus dynomatting the entire cabin and trunk gave me a surreal audio experience! please share what u end up doing or find!! someone with a lot of money will hopefully make a sick system upgrade!! I was wondering what 2 subs in the frunk would accomplish??

 

I think the general consensus is that the frunk/trunk are too acoustically isolated to provide you good response. So given the cabin is the limiting factor, there's only a few places that could potentially be used for it. I would avoid trying to use the center tunnel for anything--it may compromise the frame structure/rigidity more than you could imagine. You can put it behind a seat or in the passenger footwell, but you will be giving up usable seating room for it--so i wouldn't advise footwell unless you ride solo, and behind the seat only if you / your passenger are shorter. And that applies to behind the seat bottom or behind the headrest--you're compromising something either way.

B-pillars are way too close to the headrest to fit something between. Might be able to delete the glovebox and put something in there...maybe. Aftermarket manual seats with space underneath might afford you an alternative--but you'd be giving up a lot. Deleting the firewall window and using an opaque panel as a mount...could work, if you don't mind a only having a backup camera for visibility (and it may not pass inspection in some areas). So that just leaves my idea about deleting the waterfall in order to ADD a sub.

I have a bit more confidence in finding a way to replace the rubbish stock 10's in the doors. But I don't know that detailed measurements about mount depth and space availability have been made. If a good shallow-mount can be slotted in there with a 1/2" raised mount--and both the rear clears and the fronts don't push the door card out so far that it can't be reinstalled properly...well then you might have a good solution on hand. Otherwise, we're stuck glassing aftermarket door panel extensions so we can fit proper drivers.

p.s.
I HIGHLY doubt you need more than 1 additional sub for a compartment the size of the c8 cabin. I have a single, sealed 10" in a vehicle with a slightly bigger cabin, and it is plenty. Maybe a single 12" sealed, or a single 8" ported would be alternatives to consider. But you really do start to get into sine-wave interference and cancellation when multiple drivers of this size. And the C8 cabin is VERY small for purposes like these.

 

Having owned a 2008 bmw with mediocre sound systems...Bmw offered under front seat subs...is that possible?

 

1 10 or 12 in sub can achieve tremendous sound
..have u Inquired ferrari or lambo mid engine owners?

 

From the pics I saw, there's 0 room under the seats. It's all taken up by electronics for the seats, and possibly factory amps. Not 100% sure on factory amp locations. But there is a lot under there.

 

No. And I doubt very much that's even a consideration for them. I'm sure those owners care primarily for engine note noise and badge prestige.

 

I have a front sub in my 17 honda and will be installing one in the C6. Running an shallow Audiomobile EVO 8" in .35 cubic feet. A couple very shallow Audiofrog 8s are an option as well. Some wood and fiberglass is needed to use up available space and keep it more compact.

 

I was learning about Equal Loudness Contours, and I think this concept is badly misunderstood by consumers and easily distorted/exploited by sellers. Bose's marketing BS about "reproducing" all of the frequencies and flooding the soundstage with copious amounts of speakers is obfuscating the point.

A listener will percieve a 30 hz sound much softer than a 3000 hz sound--at equal Sound Pressure Levels. Essentially, this means that anything used to reproduce low-end frequencies will need more power and capability in order to generate an "equal" volume to the listener. So a balanced system will undoubtedly need powerful subs and amplifiers in order to create a balance for the listener.

And this is the fallacy of virtually every stock audio system. They are all failing to account for Equal Loudness Contours. The entire point of equalizers--for example--is not only to balance frequencies for output, but also to assist with perceived loudness outside of the "maximum sensitivity" zone which is around 2000-5000 hz for most people.