Homemade Super-Neo Woofer: THE CHEVELLE RESTORATION IS DONE, dampener recommendations??

[Avery Howell]

So when can I place an order?

[SnowDrifter]

Hold up... You wound your own coil?

Yeah man, it's a lot easier than I though. When I wind my mega-woofer coils I be sure to catch a video, but my boss wasn't there to help me today so I didn't have any free hands, and I had to keep all my crap on during the anodizing bath because of all the chemicals and acid.

That's really cool. I'd love to see a video of how it's done

Let me ask you this: How do you change the impedance of the coil? Is it possible to do that without changing the outer diameter of the windings *slightly*?

[Avery Howell]

I would also like to know that^

[COLTON94]

Im going to cast my vote in with the guy that said get a sub basket and soft parts and make a motor out of the new magnets. This kinda makes me wana screw around with my blown cvr 12

[Dwn4BassAlan]

So when can I place an order?

Well if I can make some college money over summer, I might just do that lol

Hold up... You wound your own coil?

Yeah man, it's a lot easier than I though. When I wind my mega-woofer coils I be sure to catch a video, but my boss wasn't there to help me today so I didn't have any free hands, and I had to keep all my crap on during the anodizing bath because of all the chemicals and acid.

That's really cool. I'd love to see a video of how it's done

Let me ask you this: How do you change the impedance of the coil? Is it possible to do that without changing the outer diameter of the windings *slightly*?

Well for my coil, using 0.405mm (23awg) wire, I wrapped it about 75 turns for about 150 turns per coil. For a bl of 46mm, and diameter of 63.4mm, and with my wire having a 0.1332-ohm/m, giving me a length of about 30.1m of wire for an impedance of approximately 4.02-ohm per coil

But it's important to remember that resistance and impedance are not the same.

So to answer your question, I believe the only way to change it (without changing the diameter of the wire or former) would be to either wind more or remove some coil, which I would imagine to be very difficult and possibly damaging to the voice coil once it has been set in epoxy and wound tightly.

This is the calculator I use now, I used it for my second coil, my first one was just math on paper, so I should be even more exact now. It's almost perfect but the bobbin length box annoys me, it doesn't seem to be super clear as to what they want from it, it takes it as if you want to actually wind the coil the full bobbin length. But you get the idea here:

http://www.daycounter.com/Calculators/Coil-Physical-Properties-Calculator.phtml

I'll do the raw formula data for you guys if you want to try it yourself.

T = bl / d

n = Turns/ T

cd = (2 x n x d) + bd

r = (n x d + bd) / 2

a = PI x r x r

L = (2 x PI x r x n) / 1000

rpm = .0333 *((0.812/2)*(0.812/2))/((d/2)*(d/2))

R = rpm x L

Where,

T = Turns per winding

bl = Length of Bobbin

d = Wire Diameter

n = Number of windings

cd = Outer diameter of coil

bd = Diameter of Bobbin

r = radius of middle of coil

a = Cross sectional area

L = Total Length

rpm = Resistance/meter

R = Resistance

[Hellbilly429]

wow dude, looks like you know your shit, keep up the good work

[Dwn4BassAlan]

I know I said I wan gonna swap the coils today, but I had alot of unexpected crap to deal with today. Then when I got home I was going to start until my dad got on my back about finishing all these damn college forms........so I didn't get to it today. But I should have it in tomorrow.

[sprkn_ranger]

That coil looks great man...are you going to use a paper cone this time around?

[STEvil]

guys. can a crossover switch my polarity? The sub is definitely wired correctly, did 3 different battery tests, switched the wires, hooked it up both ways, and no matter what, the sub always pulses inward?? The amp has a built in crossover that has a switch for "Bypass or Variable" and either way it pulses inwards...

If you think your sub is moving the wrong direction just reverse the positive and negative to test.

check that your head unit or whatever is providing the signal to the amp doesnt have the output phase reversed.

[Dwn4BassAlan]

guys. can a crossover switch my polarity? The sub is definitely wired correctly, did 3 different battery tests, switched the wires, hooked it up both ways, and no matter what, the sub always pulses inward?? The amp has a built in crossover that has a switch for "Bypass or Variable" and either way it pulses inwards...

If you think your sub is moving the wrong direction just reverse the positive and negative to test.

check that your head unit or whatever is providing the signal to the amp doesnt have the output phase reversed.

Yea, I did the reverse, and it pulses inwards both ways around. As far as the phase goes, it's built onto the amp, and it switches from 0*-180* but I havent tried that yet. lol it's too late to do a bass test