building a hybrid woofer

[On3Hundr3dProof 19]

Im wanting to build a hybrid woofer but have never tried this before. i have two 3 bolt Memphis MOJO motors and i want to know if i can recone them with either some 15" SSA or Sundown recone parts and run on an SAZ-3500. What do i need to know about these motors before to know what parts i can use and what parts should i use? I know the motors have 2 magnet slugs that are iirc 1" x 8.5" and the oem voice coil is a 4 layer 3" coil. can or should i use an 8 layer coil and can i use the same basket as the soft parts im using use and redrill it to fit the three bolt style?

[kylehallstrom 1]

try it and let us know

[ssh 924]

Nothing good will come out of simply putting parts together that "fit."

[On3Hundr3dProof 19]

well i cant find any of the original parts to recone or a new cartridge like memphis uses, and although i am talking to psi about a recone but i would like to use some ssa or sundown parts if possible. how wide is the coil on a nightshade v1?

Edited February 20, 2013 by On3Hundr3dProof

[djjdnap 78]

I have some dc baskets that were redrilled it looks like to fit on my MT's..

 

I dont think the basket is as big of a deal as the voice coil fitting properly.

aka not bottoming our or rubbing.

[On3Hundr3dProof 19]

yeah i saw a tutorial on caco of someone redrilling a basket to fit on the newer CM MOJOs. if i can fit an 8 layer coil in the gap i would like to try either some NS or Z parts from sundown or some ZCON parts from ssa if it wont fit an 8 layer then maybe XCON parts if the vc is the right length. really hard to find dimensions and specs from the old mojos though.

[///M5 2,833]

I thought your avatar was towlie for which the topic matches well.

Curiosity is getting to me though.  And yes, this is super relevant.  How do you plan to design a box for said frankenwoofer?

[slim2fattycake 85]

Why don't you get OD and ID of the motor as well as the coils you wanna use for a start before buying stuff. You need to do more reading if you wanna playing around with this idea.

[ssh 924]

I thought your avatar was towlie for which the topic matches well.

Curiosity is getting to me though.  And yes, this is super relevant.  How do you plan to design a box for said frankenwoofer?

That part is easy--just ask Kevin.

[On3Hundr3dProof 19]

been looking for specs and sizes on these coils and i found the ID OD for the ns v1. cant seem to find much on the mojo. havent thought of any box designs for it yet, it would be nice if i could do a direct swap from the box im building for my CM MOJOs which is 3 cubes per sub @ 32hz and 93" of port area. dont have any calipers but the vc gap on the mojo motors is about 3/8" and its 4 1/4" deep from the top of the pole piece(3 3/4" from the front plate). sundown Z v2 ID 2.97 OD 3.25 i found.

Edited February 20, 2013 by On3Hundr3dProof

[Impious 1,476]

been looking for specs and sizes on these coils and i found the ID OD for the ns v1. cant seem to find much on the mojo. havent thought of any box designs for it yet, it would be nice if i could do a direct swap from the box im building for my CM MOJOs which is 3 cubes per sub @ 32hz and 93" of port area. dont have any calipers but the vc gap on the mojo motors is about 3/8" and its 4 1/4" deep from the top of the pole piece(3 3/4" from the front plate). sundown Z v2 ID 2.97 OD 3.25 i found.

His point was, if you randomly assemble parts you aren't going to have proper T/S parameters, which means you are not going to be able to design an enclosure for it.  If you had someone measure the T/S for you, then you would be able to at least design an enclosure......but you're stuck with whatever the T/S turn out to be, it might turn out to be a turd since there is absolutely zero actual engineering or design going into the parts selection.

 

The moral of the story is your plan is not a good one.  Even if the parts fit together and you're able to assemble a working subwoofer, it doesn't mean the driver is going to be any good.  Good parts on a good motor with zero engineering going into the design does not mean the results are also going to be any good.

[Quentin Jarrell 671]

Post pics of the motors and deminsions. I will need to know :

Topplate thickness, ID, and OD

Magnet total thickness, and OD

Bottom plate thickness and OD

Assuming they used a C8 magnet we can calculate close enough T/S parameters. I don't have any baskets at the moment however I can supply you with cones, spiders, and coils(if the ones I have on hand will fit)

[djjdnap 78]

or i think you can ship them to psi aka fixmyspeaker.com and have them put together something and give you the specs for it.

 

I think............

[On3Hundr3dProof 19]

well i sent PSI a request telling them what i had a few days ago but no response yet. either way i have these motors and id like to do something with them besides use them as a paper weight lol.

[ssh 924]

well i sent PSI a request telling them what i had a few days ago but no response yet. either way i have these motors and id like to do something with them besides use them as a paper weight lol.

 

 

well i sent PSI a request telling them what i had a few days ago but no response yet. either way i have these motors and id like to do something with them besides use them as a paper weight lol.

 

 

well i sent PSI a request telling them what i had a few days ago but no response yet. either way i have these motors and id like to do something with them besides use them as a paper weight lol.

Sell them to someone else gullible enough to build a "custom" driver.

[djjdnap 78]

took them about a week/12 to get back with me.

After the initial request was answered the replies were pretty fast.

[///M5 2,833]

well i sent PSI a request telling them what i had a few days ago but no response yet. either way i have these motors and id like to do something with them besides use them as a paper weight lol.

Probably more valuable as paper weights.

 

Terrible reason to use something.  You have a target box, you are WAY better off buying drivers that are optimal for the target.

[On3Hundr3dProof 19]

well psi got back to me so im gonna get 1800w recones from them. 

[tc300 2]

I just sent my order style FI Q motor to SPLaudio on ca.com to get custom built.... Kind of makes me wonder if I wasted my money after reading all this....???

[yautja 0]

I just sent my order style FI Q motor to SPLaudio on ca.com to get custom built.... Kind of makes me wonder if I wasted my money after reading all this....???

 

 

I wouldn't worry about it too much. People here like to act like it's impossible to build a decent custom sub but that's just not true. Sure, the first or second time you build one the T/S specs may not be exactly what you want, but with experience you start to learn which parts work well together. For example, below are two custom subs built by a member on caraudio.com (Zeus for those who know him). You'll also see the T/S specs for those subs. I would have no issues running those subs and I'm sure they would perform just fine if not better than a lot of other subs.

 

 

 

As far as SPLaudio, I couldn't really tell you what his custom subs are like as I've never played with one. From what I've seen on the forums, he seems to be more of a SPL guy. I have seen a lot of the subs that he builds using multiple medium to hard stiffness spiders (not my cup of tea for a daily driver lol) and I have never seen anyone post the T/S specs of the subs he builds. However I have also never seen any bad reviews on him and everyone seems to like the subs they get from him.