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Ultimate bass driver . . . no, really . . .

#41
I mean, you guys know it's a subwoofer, right? It's not designed at all as a "full range" MI driver, so wondering how it would sound in your Ampeg cab is a bit silly. I imagine if it was in the right sized and tuned box, and properly crossed over with something a bit more bass guitar-centric (like a GK NEO 412) could probably be pretty cool for some 5 or 6 string stuff (and/or with octave/synth sounds). Totally impractical, sure. I'm not talking about paying for it, or moving it, just using it. But not everybody wants to sound like an Hohner with flats through a 50w Bassman and old 2x12 cab or whatever.
 
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#42
4000 watts RMS ?
assuming your car audio amp/inverter is 100% efficient, it would require 333 Amps of current from your car to run at full noise.
Dead battery in about 2 minutes.

Better off with a eccentric silo bin shaker motor using a bass audio modulated 3 phase variable speed drive for the electric motor.
images?q=tbn%3AANd9GcR2rKiyuMjWrJ8MApyj8ICshboVplcba7FWLBdjtckeo9o5LXCc&usqp=CAU.jpg

or,
audio modulated hydraulic actuators driving 8 piston rams pushing a 10 meter (400 inch) round plywood speaker cone. (But bring your own 400 horsepower hydraulic power pump plant).
hydraulicspneumatics_2998_fig1_14_21_27.png


and to extend the H.F. response, 36 of these on top (in a 6 x 6 matrix array)
bGFyZ2VtZW50Ijp0cnVlfX0sInZlcnNpb24iOiIwMDZkYWEyZTUzMTY0YzExNjJmZGZkY2EwNThjNDU3OTc1ZThkYjJjIn0=.jpg
 
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#43
Now you know how they get those vids of girls with long hair sitting in a car and having their hair blown like a high wind is coming out of the back seat. I just hope they're wearing ear plugs.
 
#45
gumtown said:
4000 watts RMS ?
assuming your car audio amp/inverter is 100% efficient, it would require 333 Amps of current from your car to run at full noise.
Dead battery in about 2 minutes.

Better off with a eccentric silo bin shaker motor using a bass audio modulated 3 phase variable speed drive for the electric motor.
View attachment 3815799
or,
audio modulated hydraulic actuators driving 8 piston rams pushing a 10 meter (400 inch) round plywood speaker cone. (But bring your own 400 horsepower hydraulic power pump plant).
View attachment 3815800

and to extend the H.F. response, 36 of these on top (in a 6 x 6 matrix array)
View attachment 3815801
Click to expand...
So what you're saying is, the average car wood probably need three or four alternators to keep that thing going as well as a keeping all the other systems powered? And that's assuming the engine is cranking them around enough?

Competition car audio is nuts.
 
#47
pie_man_25 said:
So what you're saying is, the average car wood probably need three or four alternators to keep that thing going as well as a keeping all the other systems powered? And that's assuming the engine is cranking them around enough?

Competition car audio is nuts.
Click to expand...
4000 watts (= 5 horse power x inefficiency) has to come from somewhere,
so yes,
you would require 4 x 100 amp alternators to run just the sub speaker at its supposed 'rated full RMS power'.
 
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#49
WinISD is kinda persnickety with its value checking, so I've learned which parameters and in what order to enter them. I don't know how they check out with reality (and never will) but the published specs are at least self-consistent.

Q = 0.7 requires a box about 11.2 cubic feet, and the driver itself displaces 2 cubic feet. Published design box is 5.4 net cuft, or Q=0.8 - honestly I was shocked, These things always seem to be installed in very high Q boxes because 1) you get the bump, and 2) nobody really cares about note bloom when they're measuring SPL. :rollno:

That reference design yields an F3 of only 37 Hz though - I suspect you could do better and still come in 23db cheaper.

They publish ported specs but the only alignment that looks even remotely feasible (EBP is 47.5) is SBB4 and that clocks in at 17.4 cubic feet including the driver.

Perhaps the most alarming note in the doc, however is this reminder:
Warning: sudden stops or auto accidents may cause speakers to dislodge and become projectiles.

400 lbs in the back seat in a wreck being restrained by MDF? No thank you.
 
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#51
mmbongo said:
MTX car stereo woofers were junk back the early 90's. I can't imagine that has changed :)
Click to expand...
Isn't that true about most car audio? I've got a pair of Pioneer coaxial drivers in my front doors. They're not bad per se, but finding real data about them and about amplifiers - at least on the cheaper side of things -beyond basic power ratings is kinda like pulling teeth.
 
#53
pie_man_25 said:
Isn't that true about most car audio? I've got a pair of Pioneer coaxial drivers in my front doors. They're not bad per se, but finding real data about them and about amplifiers - at least on the cheaper side of things -beyond basic power ratings is kinda like pulling teeth.
Click to expand...

Car audio is a completely different game now. Back in MY day, there were two companies that made 90% of the speakers....Credence and Eminence. Both from Kentucky a few miles from each other. Now everything is made in China and like you say, good luck finding any data on them.
 
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#54
dalkowski said:
Yet another thread that makes me want to kick myself (or worse) for not studying audio engineering....
Click to expand...

It's never too late to start.

mmbongo said:
Car audio is a completely different game now. Back in MY day, there were two companies that made 90% of the speakers....Credence and Eminence. Both from Kentucky a few miles from each other. Now everything is made in China and like you say, good luck finding any data on them.
Click to expand...

Really, eminence? That's cool.
 

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