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SR wrote:6 1/2" coaxial dls ur series in a bmw e30 kick panel
No tuning and centre image is defined but shifted slightly to the left with very good stereo separation
As with speakers in the kick stage height is a little low just around dash level
Panels custom made and bolted to the frame of the car freq response goes down to around 45hz with cabin gain
Excuse the black mess on the carpet remnants of a cheaper quality sound damping materiel that was used on the original kick panel.
This is my personal vehicleIMG-20200123-WA0034.jpegIMG-20200123-WA0033.jpeg
meccalli wrote:Unless your trunk ib really ends up being a large sealed enclosure, which could work.
meccalli wrote:keep in mind excursion issues because inherently those drivers are designed to be supported by an air spring which raises Q, rather than mechanical control via spiders and suitable motor force.
meccalli wrote:Ideally you want a qts over at least .6, .8 and above being ideal for ib applications.
meccalli wrote:All of those subs are low Q, meaning you're going to have to pump more power, equalise the low end because of the fast roll off
ErinH wrote:Fs and Qts are tied at the hip. Fs defines where the rolloff of the driver is located. Qts defines what the rolloff shape looks like: shallow or high. The lower the Qts number the more shallow the rolloff. If you have a Qts > 0.7 it will have a resonant peak just before rolling off; and the higher in Q you go, the higher that rolloff rate will be. This is with all speakers, not just subwoofers.
Firewall wrote:Pretty much everything i have read indicates that iinfinite baffle for a vehicle (maybe better classified as trunk baffle?) can be modeled as a large sealed enclosure
Firewall wrote:If i am reading this correctly, lower qts subs will have a shallower rolloff at the fs, while higher qts subs will have a peak at fs before sharply rolling off.
Center image seems more defined when aimed at point 1SR wrote:How are your centre images?
Definitely a concern for me. The speakers are a bit bigger than expected. Good looking out!kavaninho wrote:Great stuff, ensure when you fabbing the pillars make them most compact as possible as to not obscure your sight through the windscreen. Especially right side.
Based on some reading, i am thinking about bringing them more forward, in which case they will definitely need raising to clear the gauge cluster.SR wrote:Try raising the mounting height of the dash speakers worst case it needs to clear the gauge cluster.
All of this is why I suggest mounting tweeters on axis, using a small mid between a 6 and a tweeter, and keeping speakers away from the junction of the dash, side window and windshield. Tweeters are not as big a problem as midrange speakers in that location
What this is doing is getting the drivers as physically close as possible to the prominent reflecting boundaries. What this does is it pushes the comb filtering as high up in frequency range as possible, and everything below that is mostly unaffected by the early reflections (in relation to the distance to said reflecting surface to X frequencies wavelength)
The reason i believe that keeping them in the same plane vertically, isnt as simple as they can act like a single speaker and arrive at your ears at the same time. If the speakers are in different locations you can still use delays to make the DIRECT response in time. The problem is there is no way to control the on and off axis response of a speaker separately. Since the horizontal plane is more important in relation to dispersion, we want them vertically and close so not only the on axis response is in time/phase, but so is the off axis/reflected response. We have noticed some seriously good improvements when doing relatively simple systems with this method.
His last JBL set is what I'm using right now. Most people who heard it are impressed so I can't even imagine what these can do.Rovin wrote:nice !
non-sq guys checking this thread out must be wondering wtf going on [emoji38]
JBL ftw , nice to see something " a lil more common" & more down to earth than instead of some of d more "prestigious exotic brands"
imo these stock corollas front doors already have good acoustics so i eagerly awaits to hear how midbass response compares to mine , i myself want to try ah ting from d A pillars , just got to make a trip to d bamboo 1 day ... i doh want to frig up d original set
altec wrote:Oh Gord!!! I am salivating at those JBL speakers..Still have my MS series amps (2 4 channels and a mono ) waiting to install.
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