sundownz

If we have b-stocks we usually sell them on the forum.

Yes, they will work well in small sealed enclosures.

http://www.stevemeadedesigns.com/board/topic/104493-sundown-neo-pro-8-10-pre-order/ Mounting info in there.

Since it is answered and I'm pretty sure I know where this will go -- I will close the thread down. For further technical inquiries I can answer them via e-mail.

both!!! lol shits about to get real PC answer is... yes you can. Real answer is... because the coil is 100% identical to our original SA-8 coil design down to the epoxy around the top winding. Gap width, spider roll, cone, and surround are also identical to original SA-8 spec parts. So yes, of course it will fit in the motor.

Do you want the real answer or the politically correct one ?

That and it has more clearance from the cone to spider -- less mechanical noise from rubbing together.

Awesome :drink40:

This is not a v.2 version -- this run is the v.1 motor and coil with the new style frame. I have not completed development of the v.2 model yet.

Expected to complete at our factory on June 20th -- so ETA will be July 20th to 31st. I'll run pre-ordering until July 5th.

Since we have been out so long I decided to open pre-ordering for the month of June -- they are due in July with the specific ETA still being up in the air. I will post when I get a better date within July. I will run this for the month of June and maybe a little bit into July depending on the specific date of arrival. This run features all the updates so far on the 8s AND the new style frame: This frame has superior clearances and is actually a bit easier to get in the hole with large speaker wires. A win-win all in all The magnet boot IS still included -- the frame pic is just a bit older. ----- PRICING : 1x SA-8 = $119 2x SA-8 = $109 each 4x or more SA-8 = $99 each Shipped in continental 48 states cost. Paypal to [email protected] -- MUST SPECIFY D2 or D4 coils ! You can also order from your favorite online or local dealer to receive the pre-order pricing.

Don't forget about these guys -- we are sold out of SA-8s but Mike still has them. He is on the road for work on and off but be patient for a good deal

We used a pretty small motor for this discussion... 120mm OD magnet utilized. When I made enough room for the sleeve we dropped off 34% of the motor force factor (BL^2/RE) -- in order to get this back the magnet had to go all the way up to 150mm OD and in turn the back and top plate OD both had to expand as well. So much more steel and much more magnet. 634g magnet to a 1109g magnet -- we had to gain 75% magnet mass. Total motor went from 1890g to 3112g -- so a 65% gain overall in mass not counting mass added by the sleeve. So it is fairly significant in terms of cost to get a highly functional sleeve and to "gain back" the desired motor force lost by making room for it. And again, if this pans out for the target cost of the driver these thick sleeves do work great.

* SA motor -- the top aluminum piece acts as a pole cap ring. * The brass piece is a magnet ID ring from a Z v.2 motor. This goes around the inside of the magnets below the top plate / above the back plate. It is sitting on the SA motor simply for reference purposes. * Acoustic Elegance drivers with pole sleeve shorting rings

This thin sleeve has a nice effect at rest and on rear-ward -- seems to lose effect combined with the magnet ID ring, though, as that is equal to the magnet ID ring only. ----- So now lets do a thick sleeve : Full 1.0mm thick -- and the effect is MUCH better and also alleviates the issue of being cancelled out by the magnet ID ring. The only problem is you need to add more motor to compensate for this type of sleeve as it widens the gap a good bit -- for this example the pole had to go down from 35.7mm OD to 33.7mm OD to fit this sleeve. If the design budget allows for this then no problem -- the issue you end up with is spending more money on the motor by adding magnet to it. The benefit is that the sleeve is the most linear method simulated -- the Le curve is completely flat in this case. In most cases price to performance the magnet ID ring would be a better selection unless you are going for ultimate reference level.

Yes.

People ask me this alot... the short answer is that they make the speaker better. The long answer can be shown on some graphs. This graph shows inductance over excursion for a basic motor design. The center is at rest, left is rear stroke, and right is forward stroke. Why is the graph shaped this way ? Have you ever looked at inductors for a crossover ? You can get a high value in a small package with an iron core. So... what is a speaker motor ? A partially iron core inductor! As the coil moves back it gets more iron in the core! So the inductance rises. As it moves forward it gets more air in the core so it drops. Pretty cool, huh ? Now... the field can be absorbed by a conductive material in or around the coil -- so shorting rings come into play. One approach, which we use on the SA series and NS v.2 series, is a pole cap shorting ring -- note how it reduces forward inductance and at rest inductance. But not much in the way of rearward... Well the NS v.2 and Z v.2 both have a large magnet ID ring -- notice the huge effect on rearward inductance and at-rest inductance ? As a note... the SA will also have this ring shortly too. Now... having BOTH rings like the NS v.2 has now and the SA will have soon... huge effect across the board! Not only is the inductance more linear but it is much much lower. Why is this good ? 1) More power delivery to the coil as inductance causes "rise" 2) Less distortion -- inductive distortion is odd order and unpleasant; although a fairly small part of total distortion. 3) More high-end extension as inductance is a 6dB per octave low-pass crossover. 4) These rings also act as heat-sinks; although this effect is not a large reason to use them in and of itself. Can a speaker sound good without them ? Sure! Many great sounding speakers don't use them and they are pretty expensive too so don't always represent a good price to performance ratio. I do not plan to use magnet ID rings on lines less expensive than the SA series, for example, as the ring represents such a high % of the total cost of the speaker at that point (large chunk of aluminum, copper, or brass). But they do have benefits and I figured some of you might like to know what those are.

Finally got it done -- something I've wanted to do for quite some time now. Our published X-Max is dead on by both BL and CMS definitions -- we publish 19mm one-way travel. Inductive performance is above average as well. Our published T/S specs are also very well close to the Klippel data -- the one we sent in was just a tad less broken in than the unit published on our site so the Klippel FS was a few Hz higher but as you can tell if you know about the effects of break-in it will settle right in to exactly what we say. Those that don't look at Klippel often may note the BL curve is slightly to one side -- this is not unusual in production tolerance. The shift represents the coil 2mm too far forward. This is within an acceptable production tolerance and as you can see does not interfere with the 19mm of published linear x-max. The CMS curve is also a tad tilted -- this is because a normal surround is always biased in stiffness one direction. Again, very normal behavior without going to an exotic type surround. Little bit of tech talk along with published Klippel data for you guys. Hope you enjoy.

Correct. I am still working on both projects.

Good stuff !

We clipped it on purpose to abuse it -- the tick sound is actually the triple joint ring hitting the top plate.

Only took 24+ hours to upload *laughs* Slow DSL upload speed for the lose. Little after hours woofer destruction (I call it R&D) fun.

Drops in the low 20s.

2 ohms -- with the coil in these that is really close to 2.0 DCR