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Coil positioning in the motor when assembling cone etc


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did you shim it?

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Alpine CDA-9887

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lol, I shimmed it. That was just the pessimist in me coming out. It's all together. Coils read a steady 2.1 so we'll see when it's all cured up in the morning. I plan on using it in a sub for my garage. Any suggestions on the tuning/size of enclosure?

And type-r's are a pain in the ass! As long as it makes music I'll be happy. I am about to upload some pics from my phone and will post them in a while. I think I am going to try this with some other subs later on. Just gotta keep checking the for sale section for motors and baskets.lol

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First step....

Measure coil and find the center and mark it.

Second step

Measure thickness of top plate, cut that in half and add it to the first line.

Third step

Align second mark to top of plate. This is how to center a coil properly. With shims in place spin your spider to seat at spider landing. Pull all of assembly back out and carefully add a bead of ca glue around bottom of spider at coil. Be sure not to move the spider or it will end up off setting coil and it will ruub.

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these type rs are a bit different. There is a plastic ring that holds down the bottom spider and you have to glue the spider to it before you screw the ring back down. I did some tricky aligning and am pretty sure it's good. Did the old "push on it" test.lol If it rubs I'll play it till it quits!

How low should I tune the enclosure? I know home audio subs are tuned higher, I figure about 45hz or so. Any ideas?

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these type rs are a bit different. There is a plastic ring that holds down the bottom spider and you have to glue the spider to it before you screw the ring back down. I did some tricky aligning and am pretty sure it's good. Did the old "push on it" test.lol If it rubs I'll play it till it quits!

How low should I tune the enclosure? I know home audio subs are tuned higher, I figure about 45hz or so. Any ideas?

Coil positioning is still the same bro. Once you set first spider hieght then you worry about bolting it to the frame. The only reason they use the bolt down rings is thier cheap glue doesnt hold a candle to our American glue.

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I know the coil needs to be centered. I am sure it's good. I'll see in the morning. I got the kit off ebay and hope it was worth it. Definitely not a "drop in" recone! So far I have $70.00 into it. I could have gotten a working 10" Type R for around the same price for sure, but I wanted to see if I could rebuild a blown one.

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First step....

Measure coil and find the center and mark it.

Second step

Measure thickness of top plate, cut that in half and add it to the first line.

Third step

Align second mark to top of plate. This is how to center a coil properly. With shims in place spin your spider to seat at spider landing. Pull all of assembly back out and carefully add a bead of ca glue around bottom of spider at coil. Be sure not to move the spider or it will end up off setting coil and it will ruub.

this right here!

I also always measure my height to my spider landing and mark a line around the former with my calipar to give me where the spider needs to be on the former before setting the coil in the gap to get the spiders even with the coils shimmed out. 1 extra step but works much quicker imo

 

 

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so I just gave the sub a "free air test" with a directed 1500d, lawnmower battery and a Sansa. I knew I should have sewn the tinsel leads but I was in a hurry! Aside from a little lead slap it gets down! Gonna try and get some wood and do up a little enclosure today for the wife's car! I'll try to make a video when it's done.

I was surprised how much power it took, I know free air doesn't show it's full potential but it took the amp most of the way up and didn't bottom out and there was no coil rub!

I am a bad ass!lol

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