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Old 02-12-2015, 07:59 PM
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Default 2016 magnetar

Below is a little info on a possible driver that MIGHT be available late this fall. IT incorporates MMAG (multiple magnetic air gaps) and LRRP (low reluctance return path) technology.

LRRP has never been used before in a subwoofer and has never been used in a transducer as I'm using it in this driver. On a lot of pro drivers that use neo on their poles it can be difficult to get enough motor strength due to the small diameter of the coil so a bucking magnet is added to the top of the pole to increase BL. This however isn't very effective because the magnetic flux must flow through air in order to complete the magnetic circuit causing it to have high "reluctance". In LRRP a "top plate" is added on top of the bucking magnet to reduce reluctance. Doing this can increase BL up to 50 percent versus around 20 percent from just adding the bucking magnet alone.

Another huge advantage with the additional plate is it creates a B field at the top of the stroke opposite of that of the main gap so active breaking is added to the top of the motor. I went a step further and made the back plate aluminum so not only does this driver have breaking at the top of the stroke but it also has breaking equal to the motor strength in the rearward stroke as well. Why is this an advantage? Well as long as the cones inertia does not over come the breaking area's strength you can put an unlimited amount of power to the driver and not have it bottom out or over drive it. It also increases transient response as the breaking area "throws" the coil back to its center resting point.

By incorporating MMAG the driver retains 100% BL over its entire stroke. Theoretical numbers below.

The Magnetar will have:
BL 31.6
Re 1.68
motor force factor 594
xmax 45mm one way at 100% BL

If another driver with a normal overhung coil and an xmax per 70% BL at 45mm it would look like:
BL 31.6
Re 1.68
motor force factor 594
xmax 45mm one way at 70% BL

So at 70 % BL:
Bl 22.12
Re 1.68
motor force factor 291.25 at xmax

THE MAGNETAR WILL HAVE TWICE THE MOTOR FORCE AS THE OVERHUNG SUB AT XMAX.


Now take some of the current SPL subs with motor force factors in the 325 range.

BL 24
Re 1.68
motor force factor 323
xmax 35mm at 70% BL

This means at xmax these drivers have a BL of around 16.8 and a motor force factor of around 168 at xmax giving them less than 30 percent motor strength of the Magnetar giving the Magnetar a HUGE advantage in SPL.

[IMG][/IMG]

The Magnetar will use N52 neo 4 inches in diameter about 2.4 inches thick, a 4 inch 8 layer coil 50mm long. The red area in the pic is where the magnets are and the arrows show the flow of magnetic flux
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Old 02-12-2015, 08:31 PM
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That looks intense. Subbed for any future updates.
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Old 02-12-2015, 09:03 PM
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Gimme!
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Old 02-12-2015, 09:16 PM
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Looking forward to seeing the prototype bud.
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Old 02-12-2015, 09:34 PM
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Neo is expensive right now
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Old 02-12-2015, 11:03 PM
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Quote:
Originally Posted by So Low View Post
Neo is expensive right now
So manufactures like to tell you. This ain't my first rodeo.
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Old 02-13-2015, 09:24 AM
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Looks like the love child of the SMD woofer and the JBL GTi woofer. :P I like it. How much $$$$ ?
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Old 02-13-2015, 09:32 AM
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Quote:
Originally Posted by Quentin Jarrell View Post
So manufactures like to tell you. This ain't my first rodeo.
Price to performance ratio on dss is really good obviously all of us consumers hope it stays that way
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Old 02-14-2015, 05:30 PM
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I'm guessing all the parts have to be custom tooled?
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Old 02-14-2015, 06:20 PM
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Quote:
Originally Posted by Beasteggs View Post
I'm guessing all the parts have to be custom tooled?
Until OSD tabbed frames are tooled TI frames will be utilized. Thilo's ornamental patent on the 12 expires this spring so this may be offered in a 12 also.

New cones with updated edge geometry to handle over 45mm should be ready in time.

This will use a open tooled 4 inch fiberglass former from precision. I was going to use a edge wound coil with inner and outer windings but about $3.5k in tooling for mandrels were needed and the manufacturing cost of the coil itself was going to be $75. I'm trying to keep these under $1,500 shipped so I opted with a normal 8 layer flat wind coil.

It's kinda hard to see in the top pic so I highlighted them in dark red below. There is TON of aluminum faraday rings and heat sinks in the motor. The center piece will have a scalloped OD and the id is the same ID as the gap to getting it as close to the coil as possible to aid in conduction cooling. The inner faraday ring in the center is to reduce induction. There would be some on the OD of the magnets as well but there is a variance on magnet OD's and I wanted the magnets as large as possible. The other outer rings are there to aid in conduction and have cooling vents radiating outwards through the side of the motor.

[IMG][/IMG]

The bottom plate has cooling vents. The "top plates" have rebates similar to the Ethos pole to minimize back pressure under the cap and aid in convection cooling.
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