Testing "SA-12" Prototype

Raw most likely - I suppose I could make a magnet boot but 99% of people will never see the back of the woofer again after installed.
X-Mech is what I am talking about - the point at which the woofer can't physically move farther. The first prototype I've been testing has 16mm of linear x-max but was able to physically move 26.25mm and bottom out. I am making some changes for 18mm of linear x-max but 33.75mm before the coil can bottom out.
16mm is about all you would need for 600 watts... a larger coil will just increase peak numbers...result is lower musical output raise dampning and be peakier unless you give it more power or plan to tune its really really low...none the less your a smart man and i sure anything you build will exceed expectations...

 
i like the woofer you got there.. simple nothing fancy... good parts good design nothing cheezy or flashy.... it is nice to have a sweet looking DC though. what you plan to change on this woofer?
Just these things:

1) Adding 10mm to magnet stack (for more x-mech primarily, FEA shows very slight increase in motor strength)

2) Moving vent holes closer to the pole by 5mm (if the magnets are slightly off by even 1-2mm at current spacing they can block air flow, accounting for production tolerance)

3) Making the coil 5mm taller and increasing pole extension as well (since I have so much rearward x-mech I want to make it harder to jump the coil forward too)

4) Creating a plastic spacer ring under the basket (the pole was getting too close to the dust cap, it could potentially smack the cap with increased x-mech) - this is also why I used a bubble cap in the first place.

Thanks for the comments //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I am pretty excited about it - the cap will be exactly the same except with "Sundown Audio" on it.

 
I'd buy 2 of them for $350 shipped when it comes out
um, i dont think you understand sonething, lol

usually when a product comes new from the factory, its usually a "no haggle" type deal

im pretty sure that he said 200 ea? so 400+ shipping will do it //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 
Factory finished my new prototype - I should have it soon... thing is a MONSTER:

SA12-1(new).jpg


SA12-2(new).jpg


It is as big as it looks //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

MSRP will probably creep a little over 200 for my changes, but not much.

 
//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif :) //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
 
Daily sub - sounds good, handles alot of power, hard to break, and pretty loud too.
idk i think this and the sd 2.5 will be very close. we need both um to be compared side by side //content.invisioncic.com/y282845/emoticons/sneaky.gif.7189749b3a3f769e8815b47e8ae87f88.gif

 
idk i think this and the sd 2.5 will be very close. we need both um to be compared side by side //content.invisioncic.com/y282845/emoticons/sneaky.gif.7189749b3a3f769e8815b47e8ae87f88.gif
and the IA LI. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 
Looks interesting.

//content.invisioncic.com/y282845/emoticons/clap.gif.178cba2c538c68e720c727fcb024b19c.gif

Is the plastic ring for increased excursion clearance?

 
Looks interesting. //content.invisioncic.com/y282845/emoticons/clap.gif.178cba2c538c68e720c727fcb024b19c.gif

Is the plastic ring for increased excursion clearance?
So the pole cant hit the dust cap under extreme excursion levels //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif It would take 3-4x rated power to make that happen - but you never know *laughs* Tried to cover all the bases here.

Also does give the spider a wee bit more rearward clearance for the inner rolls on back stroke.

 
does using plastic as the ring material insulate the basket from heat transfer from the motor structure? if so would the thermal limit be raised if the ring was metal and the basket helped disapate some of the heat?

Ignoracnce here, just thinking out loud and wanting to learn;)

 
It would benefit passive cooling but the ring would have to be a non magnetic metal which would be expensive - and this is a budget driver. This sub doesn't really need the added passive cooling of the frame to *easily* handle rated power and more, though.

 
It is a good question - I've done prototypes with aluminum rings before. Its awesome and does aid passive cooling but cost to benefit is not the best -- on an expensive driver where cost is not an object it is something I would consider strongly, though.

The PG TI Elite 12D has an aluminum ring on the top plate, FYI //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 
It is a good question - I've done prototypes with aluminum rings before. Its awesome and does aid passive cooling but cost to benefit is not the best -- on an expensive driver where cost is not an object it is something I would consider strongly, though.
The PG TI Elite 12D has an aluminum ring on the top plate, FYI //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
In your opinion, is this type of cooling (basket) a real world benifit? would there be appreciable power handeling or longevity?

 
In your opinion, is this type of cooling (basket) a real world benifit? would there be appreciable power handeling or longevity?
Over the long term it is a benefit - in my testing if you play a sub for 1+ hour at high power it will get quite warm up to the rim of the basket. The cast aluminum frame is a pretty good heat-sink. I've had frames too hot to touch after 2+ hour power testing.

On the SA-12 the frame will eventually soak up heat through the basket screws and just by proximity to the hot coil - but the heat transfer is not as efficient due to the plastic ring. But the ring was necessary to help prevent potential physical damage to the driver.

 
Over the long term it is a benefit - in my testing if you play a sub for 1+ hour at high power it will get quite warm up to the rim of the basket. The cast aluminum frame is a pretty good heat-sink. I've had frames too hot to touch after 2+ hour power testing.
On the SA-12 the frame will eventually soak up heat through the basket screws and just by proximity to the hot coil - but the heat transfer is not as efficient due to the plastic ring. But the ring was necessary to help prevent potential physical damage to the driver.
I definately understand the reason for the plastic, a driver like that for the $200 range is exactly what is needed in the market place, raising that price point would be unfortunate, so the potential benifits to cost wouldn't be worth it at the risk of the increased MSRP. You have to stop somewhere. I am very excited about this sub linem I think it will be well recieved.

Thanks for the tutorial:D

 
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