Cheap DD Replicas

[Decado2 10+ year member]

I blew one of mine testing a 3000D on the pair. I had probably weakened it earlier testing 3000Ds on 1 sub at a time //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Anyhow... putting a 12-spoke and a flat-wind RE based re-cone on it to get them running for testing again. The spider landing is slightly too small to take the RE style spider so I could not use the stock basket.

Hey, could you post pics and let us know how the recone goes, I am getting one of the 12's from Parkave, I will be running it on a single Kx2500.1 at 2 ohms.

How do you fix that problem you were talking about earlier, the one about the spider or something making noise?

 

[CJW 10+ year member]

Hey, could you post pics and let us know how the recone goes, I am getting one of the 12's from Parkave, I will be running it on a single Kx2500.1 at 2 ohms.
How do you fix that problem you were talking about earlier, the one about the spider or something making noise?

You would have to recone it. I don't know how you would take out the spider, flip it around, and put it all back together without destroying it in the process.

 

[sundownz Pro Seller]

Hey, could you post pics and let us know how the recone goes, I am getting one of the 12's from Parkave, I will be running it on a single Kx2500.1 at 2 ohms.
How do you fix that problem you were talking about earlier, the one about the spider or something making noise?

CJW is right, you can't fix the noisy spider without a total re-cone. You can keep the spider from coming loose from the basket with a bunch of epoxy -- I had to use a screwdriver and a hammer to get mine apart since I added all that epoxy.

I'll throw up some pics of the finished product. My RE re-cones did not quite fit on the original basket, the original has a lip around the outside to center the spider ring -- the RE spider would sit on the lip and not the landing. So I'm using a 12-spoke. Coil alignment looks accurate enough vertically... gap is pretty tight between the pole and coil, only 6 thin sheets of paper (RE XXX was 12 sheets for reference). I need to order some terminals before I can finish... I forgot that I didn't have any spares that were the solder-to type.

 

[NJTStang11 10+ year member]

I see alotta little issues with these on good power, but how did they test with less power?

Let's say I picked up a single 12" and ran it off around 1200rms

Would it last? Would I need a recone? etc

Also, how are they SPL/SQ wise? In comparison to say DD as well as something like a 12" L7? Worth the money?

 

[Decado2 10+ year member]

Hey Jacob, that would be great if you could post yiour pics when your done //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[sundownz Pro Seller]

I see alotta little issues with these on good power, but how did they test with less power?
Let's say I picked up a single 12" and ran it off around 1200rms

Would it last? Would I need a recone? etc

Also, how are they SPL/SQ wise? In comparison to say DD as well as something like a 12" L7? Worth the money?

You will still need to epoxy the spider landing, but yah, it should take a 1200 watt RMS amp fine. May still have the spider "popping" issue as that is a design flaw.

 

[sundownz Pro Seller]

Hey Jacob, that would be great if you could post yiour pics when your done //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I just finished one. Will be making another the same way.

Specs as follows with RE 4-layer flat-wind coil D1 configuration and soft spiders:

RE (series) = 1.75 Ohms

Fs = 28.7 Hz

Qes = 0.423

Qts = 0.397

Qms = 6.461

Le (1 khz) = 1.08 mH

VAS = 39.25 L

BL = 12.22 N/A

Cms = 153.59 uM/N

Mms = 199.8 grams

Should sound quite good. The BL^2 / Re is 85 which is right around where many good sounding woofers sit (not over motored).

If you want to continue using it as an SPL sub I highly suggest an 8-layer flatwind... but a 4-layer, as you see, turns it into a very daily friendly type sub. I *did* break it in before measuring these specs as well, FYI.

 

[sundownz Pro Seller]

And yes... that corner of the office IS very messy.

 

[bose301s 5,000+ posts]

Looks sweet, how does it sound? I've also noticed that you seem to be obsessed with RE recones, any particular reason? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[sundownz Pro Seller]

Looks sweet, how does it sound? I've also noticed that you seem to be obsessed with RE recones, any particular reason? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Because David is a cool dude //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I haven't listened to it yet, I need somewhere to put it *laughs* My car is broken down at the moment.

 

[bose301s 5,000+ posts]

Because David is a cool dude //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
I haven't listened to it yet, I need somewhere to put it *laughs* My car is broken down at the moment.

That sucks. How does RE compare to Fi for recones? Also, if I ever needed a recone for my BMs where would I have to go? I'm just wondering since they have 2.5" coils instead of the standard 3" ones obviously.

 

[sundownz Pro Seller]

That sucks. How does RE compare to Fi for recones? Also, if I ever needed a recone for my BMs where would I have to go? I'm just wondering since they have 2.5" coils instead of the standard 3" ones obviously.

Good luck on the BM //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif It has a 60mm coil so it's hard to find as standard is around 63.5mm ... I'm looking for a source.

RE does a good job on re-cones for me, so has FI -- both do a good job.

 

[bose301s 5,000+ posts]

Good luck on the BM //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif It has a 60mm coil so it's hard to find as standard is around 63.5mm ... I'm looking for a source.
RE does a good job on re-cones for me, so has FI -- both do a good job.

Hmm, you think Nick knows a place that would recone them? Or does he have recones?

 

[sundownz Pro Seller]

Hmm, you think Nick knows a place that would recone them? Or does he have recones?

He can get re-cones, sure, as far as I know he hasn't needed any yet -- just replaced em' for people if necessary.

 

[bose301s 5,000+ posts]

He can get re-cones, sure, as far as I know he hasn't needed any yet -- just replaced em' for people if necessary.

Ah, well if he can get recones no worries then, I just don't want to have to replace these things if one were to go south.