8x T39's

[Harley]

I'd be putting some epoxy glue in behind the Tee Nuts if I were you - unless you have alreay done so and it's not obvious.

[Radian]

Are those spacers going to give enough excursion clearance for the Ciare driver?

I know 1/2" is good for the Eminence given their limits, but they don't have fully compressible gaskets and have less excursion than the Caire.

Maybe I'm being too cautious, but my eyes are little skeptical right now. I'd hate for you to hear one of those drivers run up against their baffle at full tilt.

-Radian

[thomas]

No epoxy on the t-nuts taking but them out wont be easy, they are well stuck in and removing them may harm the bite at the same time, what do you reckon about epoxy over and around the sides of them? Im not to concerned about them moving but as it will be a total pain if they do fall i'll try what i can to reduce the chances.

Damm, good point about the spacer I shall check how much the gasket compresses on one of the spare spacers knocking around, from memory its pretty substantial and approaching almost nothing.
I do have a fair concern that you point will be valid tho, so I'm thinking gasket tape on the spacer, maybe two layers if needed, so to add a little more depth. Making new 15mm spacers would be a lot of work so something I'd prefer to avoid but if it the only option then so be.

[mpm32]

To take them out, thread a bolt into the insert from the other side and tap with a hammer, they'll pop right out and there won't be any damage at all.

[Bruce Weldy]

No epoxy on the t-nuts taking but them out wont be easy, they are well stuck in and removing them may harm the bite at the same time, what do you reckon about epoxy over and around the sides of them? Im not to concerned about them moving but as it will be a total pain if they do fall i'll try what i can to reduce the chances.

Damm, good point about the spacer I shall check how much the gasket compresses on one of the spare spacers knocking around, from memory its pretty substantial and approaching almost nothing.
I do have a fair concern that you point will be valid tho, so I'm thinking gasket tape on the spacer, maybe two layers if needed, so to add a little more depth. Making new 15mm spacers would be a lot of work so something I'd prefer to avoid but if it the only option then so be.

I put the epoxy on the outside and all around them.....the issue isn't so much with putting the speaker in - it's what could happen if you want to take it out and it spins on you....might take you days with a piece of hacksaw blade trying to cut through the bolt.

[thomas]

In what must be one of the slowest most drawn out builds ever i'll be posting some more updates soon. Much has changed in the build and its definitely been quite a journey, almost finished tho.

[jswingchun]

In what must be one of the slowest most drawn out builds ever i'll be posting some more updates soon. Much has changed in the build and its definitely been quite a journey, almost finished tho.

That's funny. I was getting ready to slap someone for dredging up an old thread and it ends up being the OP coming back.

[thomas]

Update time, so the Ciare driver I had decided on was clearly going to be very tight fitting something I expected but not quite to the extent that was becoming obvious as I progressed. When I did finally decide to do a test fit it was obvious short of some serious manhandling, (compressing the gasket before fitting and such) that the Ciare wouldn’t fit. I was pretty annoyed at myself since I had checked this but turns out the data sheet Ciare provided states a depth that is a bout 2or 3 cm shallower than the drivers I had. So kind of not my fault but still pretty annoying.

I do like those Ciare drivers so for now I’m most likely going to keep them and maybe built some punishers in the future, puns vs t39 would be a great direct comparison, so watch this space though if this does ever happen it will be some way off.

After some further hornresp investigations I decided to take a punt on the P-Audio SN12-LF, I’m aware some people round here don’t quite trust what P-audio say but I decided to take the specs on face value (surely it couldn’t be worse than Ciare) . The simulations say it should preform similar to the 3012lf, (drivers PDF states a fairly good 7.5mm xmax but take note that it is 7.5mm of “true” x-max and adding Hag/3 increases it to a very respectable 10.2mm). Whilst it won’t quite offer the performance of the Ciare; it’s also much lighter, more easily available, and a tad cheaper, so a bit of a no brainer really.



Misplaced some pictures out along the way, so they now look like this.



The large casters were re-drilled on a pillar drill I got recently, this allows them to fit much closer to the cab and not protrude out the back of the cabinet as much as they previously did. I saw someone on here install a bar across the back of the castors and I’ll probably do something similar when I’m finished everything else.



You can see the modifications I have had to make to the accesses covers to allow the driver to fit in (this wasn’t the point where the Ciare was getting stuck), currently I’m having trouble with the t-nuts spinning so going to have to get some epoxy glue like suggested before for the t-nuts used on the baffle.



The frames for the grille are made and now I’m just looking to find some reasonably priced perforated metal grille to fit over them, once that is done they will attach to 6 of the little blocks glued to the edges of the mouth.





After that paint, cover the front with the foam, install and wire the speakers and all should be done.





Unfortunately I will probably have to sell 4 of them, to help fund my masters, nonetheless 4 T39’s should still do some bass heavy damage.





Bit of saw porn to:







The cat to:



Peace.

[RichardH]

If you are selling some of these bad boys, I may be interested....

Look forward to hearing how the P-Audio drivers work out - look very good value!

[thomas]

Yeh I will be selling half of them I'll let you know when they are finished and tested.

[Harley]

Yeh I will be selling half of them

You're an authorised builder?

[GirlyHandedDog]

Yeh I will be selling half of them

You're an authorised builder?

Uh-oh...

[RichardH]

Surely the way this went is that he built 8 with the intention of using them for himself, but circumstances have changed and he's said he's going to be forced to sell some of them.

Not sure how different that is from me selling the OT12s I build a couple of years ago? FWIW, I already own a copy of the T39 plans, but have never found time to get to build any.

[subharmonic]

IIRC the way to make that legit is to buy additional copies of the plans and sell them with the cabs you are selling. Being one plan per cab. But of course Bill can chime in on this.

[RichardH]

That would sound fair. Or at least ensure that the purchaser owned the relevant plan.