quote:Originally posted by sundownz: No, it is real. It is a new design from Scott Atwell.
I would say the coil is probably centered somewhere around the junction of the two assemblies to get the benefit of additional motor strength. I'd guess it would be a LONG coil too.
Just a guess, though, as they haven't said anything about the details yet.
Sounds like the former would be extremely long and prone to coil rock.
shame the plates can't be modified and another spider placed between the slugs
Posts: 5494 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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I'm just wondering if that basket can handle that weight for long periods of time, i wonder if it would possibly crack! remember some of the europeans was having some of this!
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SS 1-2 competitor! 160+ Representing Team stetsom! Posts: 131 | From: mimisburg ,oh | Registered: Jan 2006
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i cant wait i have used the xs-spl and have nothing but good things to say them and i cant wait to try one of these
Posts: 91 | From: Evansville IN | Registered: Oct 2007
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my first thought looking at this sub would be that there are 2 coil windings centered in the middle of each motor assembly just as a standard sub would be except in this case 2.
Posts: 264 | From: Bristol, PA | Registered: Dec 2006
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he motor allows for us to do several different things without stepping on current IP toes (such as increase flux density in the gap and use servofeedback loops for damping). SG2 and SG3 are steps further in the direction of more user control as well. Does the motor need to look like this one? No, not really, but it seems to illicit strong feelings and dealers think it will be a major strong point. We can tame the look and simply make it look like any other magnet boot covered rear end... but it wont be as distinct of a driver that way. Love it or hate it, it simply performs and thats the point. While Neo is another alternative, it still hasnt made the break over point for profitability on drivers of this size. Great, its smaller and lighter, but doesnt sell to the average consumer (since it doesnt break your back) inspite of its inherent gains from an engineering standpoint. Depending on how this driver and tech does with our dealer market, you may be seeing more SG tech (Im wanting to push the SG3 as it will simply blow people away). I know that an OE client will be dropping info for their SPL sub in the next couple of days as well.
"Actually, no there is no secondary suspension to avoid coil rock in the pure SPL subs. So... I simply embraced it and did something else about it. Something that for SPL is all benefit. Problem with some things we do is that I dont want to give away the farm... or at least feel that if someone wants to figure out what is done, at least buy one...lol. We have spent lots of time testing and trying different things and have to figure if its worth mentioning exactly what is done and others picking up on it to use as well, vs not mentioning things and let them slowly pick up on it and then use it.
We could have made significantly more motor force on the SMD than we have, but it simply isnt needed in a daily driver. We are currently testing the limits on just how much motor force is useful for SPL applications as well. We have some exceedingly high Gauss densities in SG2 and SG3 that arent seeing realistic gains any longer in SPL. It seems we are fairly well up into the point of diminishing returns with respect to motor force. Mentioning Gauss volumes really doesnt have any benefit to the consumer as its not a normal value, and Im sure a great many manufacturers dont use it either. We are currently testing with BL^2/Re figures of over 2800 which are almost a good order of magnitude better than most big daily subs. And that is by no means the limit of things either.
No vent on the poles for the SPL versions. Although the SMD could have a 2" vent and still not loose force, it just takes too long to bore out a 2" hole in a 4" core that is almost 8" long. We cant find 4"X2" tube in the correct material in the US. Otherwise we would use that and save the material and weight. Drilling a 1.5" hole (biggest bit I have to run that deep on the 32" swing lathe) then using a boring bar to clean it out to 2" is just a waste of machine time. Customer just gets to lift an extra 3lbs of steel"
Yes Crossfire is using it too and are shipping subs out now. I know what they do as we have been working with the design and other applications for close to 3 years now, but I still am not sure the actual limits for Extreme car applications. We will find out soon. If it seems to be of benefit to have more motor strength, we might roll into other versions sooner than later. We have no contracts on SG2 or SG3. But as I mentioned earlier, most daily subs simply dont need it as having too much motor force can become an issue as well. But it does allow for a smaller footprint behind the sub (given similar Gauss) which as Don mentioned allows for better flow.
Crossfire has already got their SPL versions shipping. AA is doing the SMD which is a daily sub. Depending on demand we may do something SPL with SG2 or SG3.
As for why not a bigger motor? You can only get so much flux through a pole... and the 11.25 single magnet on the BTL taps things out pretty good (with the gap volume we use). Making a 20" diam magnet hits the flat flat side of diminishing returns (again with our current gap volumes. This is not to say that you couldnt make a .5" wide gap 3" tall and use more magnet... just that its not a useful gap size given reality). The SG1 motor circumvents things somewhat Yes, I can do a SG1 with the BTL magnets as well. Gets more than what we are currently doing with the CF sub and way more than the SMD. But it seems that using that much motor is useless in most application (seen losses in daily and only gains in extreme class SPL setups). Hence the reason why Steves sub doesnt use more than we have on it. The industrial application we originally used this in needed more than what we have here... and they found that adding even more allowed for even better test results (hence going to SG2 and SG3 now). Running things up to 12kGauss in similar gap volumes that other companies are tapping out at 8.2 averaged kG on their best SPL subs allows for some more wiggle room in extreme SPL applications (this is not puny .500" tall tight gaps, but wider 2" tall gaps). And we can kick it up quite a ways from there with another simple trick to add 40% more to it... but again, I think that the levels we are currently achieving with the SG2 and SG3 motors are currently more than what is needed for any extreme vehicle as well without even thinking of the extra 40%... but its nice to have for some non-car audio related applications.
ABOUT THE CONE
Composites The current bane of my existence. I think those need to go back on the shelf after spending more time with core material and the forming machine designs/drawings again. I truly want to do those in house if we do them at all. The samples I have received from several companies are severely lacking. And no one wants to listen and form things the way Id like (which would solve the same problem I see over and over with the samples and cone necks. But with the extra motor strength a little more moving mass isnt an issue and I have found a great acrylic that wicks well into our standard cone bodies yet still holds a layer of glass and stringers to the backside of the cone when bagged. Been a solid step up in strength with not too much moving mass added. No where near a foam core, but then again doesnt have the same issues of the cores breaking down either. I did find an interesting method for reinforcing things by placing "stitches" from skin to skin with prepreg carbon filaments. An engineering friend of mine used to use this process on some very high stress aerospace parts. Nice thing is you can do it in patterns or in denser clusters depending on where the stresses are located.
N52, not the biggest Neo fan yet. When pricing becomes more reasonable Ill go there, but still tough to be ferrites for subs. Neo is fine for mids and tweeters. SG2 and SG3 do alright As for paper, we havent had that big of an issue. We have our distributor in South Africa doing world class numbers (not sure if he wants me to say or not) in Extreme with our cones and no issues. Thats not to say that we dont have several other tricks up our sleeve, just that we dont need to discuss them if they arent needed. Spoke with Don for a while today and we will get you going in a couple of months. Several irons in the fire right now and need to get them all taken care of before I can focus on a project like that.
-------------------- 2007 Bass Race San Mateo Regionals 120-129.9 Champ 2007 Bass Race Nationals 120-129.9 2nd Place 2007 SPLMAX cup regional champ 2007 SPMLMAX cup 3rd place overall 2007 west coast points Champ 2008 SS5+ Regional Champ 2008 139.9 Bass Race 3rd Regionals SS5+ KING OF CALI!!!!!! 149.9 Bass Race KING OF CALI!!!! only one to get a Drag and Bass Race KING OF mutha Fu*ckin CALI!!!!!!! Posts: 443 | From: San Jose | Registered: May 2007
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