I was really just kidding about one of those 5000w RMS 18s. They are on a whole other level of crazy. I don't think the BMW electrical system would like the draw from the amps. Not to mention no room for batteries or multiple alternators etc. Not the right platform for SPL IMO.I don't think you could fit an 18 on that rear seat -maybe if you installed it with the seat closed (have fun), my 15 is pretty close.
And yes, with DSP cone size doesn't matter as much any more, as long as the drivers are located close enough to couple as one (in a car, with low freq's, they do). Just remember making a driver excurt further is the least efficient means of getting more bass. it's what most sane people do though (vs. my "few dozen 12's but who is counting" home projects)
If you target a rising low end response, and want things to go pretty deep, you will run out of capability quick. These cars aren't a true IB, sort of cross between open baffle and lossy big sealed, meaning they have a lot of low end cancellation, so doing it like I have (and Rob is), you'll tend to need a little more ooomph to reach normal levels. A sealed box in trunk with same driver would be louder, never mind a ported or bandpass.
They're great, and 4 ohm single coils, so with 8 of them you could wire to 2 ohms easily. That'd give you about 100 watts each, which is more than enough to have fun with them (IIRC they're rated for 50watts).I was really just kidding about one of those 5000w RMS 18s. They are on a whole other level of crazy. I don't think the BMW electrical system would like the draw from the amps. Not to mention no room for batteries or multiple alternators etc. Not the right platform for SPL IMO.
I've always heard good things about the tang bangs. Maybe I will just do 8 6.5s of those vs. 4 8s. Same cost basically for more cone area. The JL amp will do 750 rms x1 1.5 to 4 ohms.
This is a myth. Reference; headphones. You're right though, that typically big cones with more mass and lower Fs can more easily reproduce the bottom freq's. With DSP we can change that (somewhat).You need Cones within quarter wavelength and ya I agree more subs move more air but if you want true sub like 20hz your gonna want a 12 or 15.
That's the route I went. Just had Musicar send me the whole thing plug and play. It's a single 10w6 in mine. I believe their E92 box fits a 12.I am thinking of doing similar with a l2i converter on my b and 0 in the 5 but I may just get a musicarv enclosure. It's just a jl w3 but that system is already great .
Once again reread my post please you have alot of knowledge but your to quick to correct someoneThis is a myth. Reference; headphones. You're right though, that typically big cones with more mass and lower Fs can more easily reproduce the bottom freq's. With DSP we can change that (somewhat).
The wavelength of a 20hz tone is ~56 feet. That would mean you'd need about a 15 FOOT driver to reproduce it. I'm sure you heard this from someone else though, there are a lot of poorly understood concepts audio wise that still make the rounds. In the end it's about displacement, although greater cone area does tend to "couple" with the air better vs. one smaller driver throwing further.
Sorry if the tone was off a touch -not being rude, I love this stuff.Once again reread my post please you have alot of knowledge but your to quick to correct someone
If you would like 2 speakers to act as one they need to be within a quarter of the wavelength, yes this isn't exact but it goes with the logarithmic 10x power for double in volume and 6db is double sound pressure which is not perceived volume so as much as I almost quoted 50ft for low frequency cause i wouldnt have bothered looking up and writing 56, I didnt cause I am more about real world applicable info not tech jargon. Your dsp works great for high frequency but when dealing with cabin gain and low frequency it goes out window. Ever wonder why high end systems don't delay the trunk sub yet their is the saying the driver was on the dash. A properly blended xover will get true sub frequencies on the front of your soundstage but you cant get a reg woofer to do that without time delay . Also human ears cant localize below 50hz and last but not least the real prob with dsp is with 2 forms of sound at low frequency in car, you have the sound wave and you have pressure in cabin and this is why subs cant be to far apart for low frequency. I believe even stock subs are high passed at 63hz .
My entire post equates to you can't have small drivers to far apart or they will cancel out each other