I've been gone for a while and suck at using the search function (or the search function sucks to use).

I was wondering if anyone's installed an extra midbass inside the car somewhere like under the dash or in the door.
For example, the Focal KBE, but I'll be using my own driver and XO.


And also if there were any pics of the install?

If I keep my car, what I'm wanting to do is build a 2.5way system, but can't figure out how/where to install the second midbass without doing major surgery on something.

 

It's going to require surgery. There's not enough room in the kick panels to add anything that will benefit the system. I toyed with the idea for my Diamonds, but the kicks are full already and there really isn't enough width in the footwell area to build outward. Your best option would be surgery on the doors, there's a lot of unused area next to the factory spot for a 4" mid, or similar.

 

here are a couple of threads on small in-cabin subs:
https://www.s2ki.com/forums/index.php?showtopic=247330
https://www.s2ki.com/forums/index.php?showtopic=161953

 

I was hoping to hear otherwise. Oh well. I'll see what happens this winter with my car sale. If I keep it, the stock system is gone!

 

Sounded like you are looking for SQ more than SPL. Why not get a better 2-way with stronger midbass like the Kodas? You will likely get better results that way. It's difficult enough to tune a 2 way in this car, one would need to be an expert at tuning to get decent results from a 3 way.

 

[QUOTE=RS2000,Sep 26 2007, 09:04 PM] Sounded like you are looking for SQ more than SPL.

 

Ok, quick audio lesson. Take a look at the frequency response of the Koda's graph.

You can see from 100hz-20khz it has a response of +- 5.5db, in other words, from it's lowest response to it's peak response is 11 decibels. That is HORRIBLE! To add even more comedy, they rate it as 60hz-20khz @ 88db +-3db's. That's a total lie!

To laugh even more, is the Koda uses a 3.5Khz XO point. To address comb filtering problems between the tweeter and mid, you set your XO frequency using one half wavelength of the distance between the middle of the two drivers. Assuming the distance of the tweeter from the center of the midbass in the 02-03 S2000 is around 9"? (I haven't measured), and given that the speed of sound is 1128ft/s, ideally the XO point should be set at ~750hz

I'll do the math for you.
1128ft/s * 12 = 13536in/s
13536in/s /2 = 6768in/s @ 1/2 wave length.
6768in/s /9in = 752/s, or 752 oscillations per second. aka hz.

Why would commercial companies use such high XO settings? Power handling. A lower XO setting will result in a lower power handling by the tweeter. Also, higher frequencies tend to require cheaper XO components.

Now let's take a look at the Koda's XO.

It uses two capacitors, one resistor and two inductors which are placed incorrectly on the board. It has an insufficient amount of components, plus they're located in bad spots. Why are they in bad spots? Click on this link. http://www.troelsgravesen.dk/coils.htm

My XO might look similar to something like this.

Notice while looking at the inductors, one is laying down while the other two are far away, perpendicular, and upright. That's good.

Any questions?

 

In all honesty, the S is too small of a car (sound stage wise) to benefit from a 3 way system, or 2.5 way system. The sound stage is very tunable and focusable (if that's a word) to the driver in the S with the speakers in the stock locations, it just requires the proper equipment to do so.
I went over-the-top with the components and equipment (IMO) in mine, although the sound is very impressive (esp. with the engine off) and the sound stage is perfect, it required a lot of tuning (about 3 days) to get it to where the sounds are at or above the dash level, which is where they are supposed to appear as if they are coming from in a "perfect" set-up.

 

What I'm also afraid of is getting kick panels to fit. I haven't looked inside my car for weeks now, but from what I remember it looks like (without measuring), I'm going to have a hell of a time getting them to fit with a sufficiently sized front baffle...and if it looks stupid, It's not worth having IMO.

...but if I sell my car, I won't be doing any of this.

 

^^ There's stuff inside the factory panels, you could build them out but you would lose a lot of room in the meantime. It most definitely could be done, but I don't think the positives outweigh the negatives on this one.