2 layer voice coil Seas L26roy vs 4 layer

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S

shrub0

Member
Joined 2012
#1
I'd like to include the Seas L26roy in my subwoofer shootout I've been doing on this forum. A tale of 12" subwoofers, distortion and 15 dollars.

Would the Seas L26ROY - X1001-04 with a 2 layer voice coil be better or the Seas L26RO4Y - (XM004-04S) with a 4 layer voice coil?

My testing includes testing for the max spl while under 5% distortion as well as some subjective comments from music listening.

My intuition is the 2 layer voice coil will have less inductance modulation and therefore lower distortion but the late great S. Linkwitz used the 4 layer version.

I think Hobby hifi magazine tested both but I'm not sure.

Also let me know if you have one for sale.
 
#2
Agree about the thought that the 2 layer version could have lower induction modulation.
The 4 layer version has a higher BL, which makes it more efficient in a small closed box. It also has a heavier cone, stiffer suspension and slightly larger Xmax.
You could ask Seas why they make two versions.
 
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#4
I also asked hobby hifi if they sell .pdf electronic copies of their magazines and they said no just the physical copies. So to buy and ship a magazine and then manually translate to Engilsh is a little beyond my scope.
 
#5
Weird. I would reckon that Seas has got Klippel reports of their own woofers. That would tell us about the inductance modulation. Maybe they do not have sufficient customer service capacity to help consumers.

Here is at least Klippel data of the L26ROY
Test Bench: The L26ROY 10” Subwoofer from SEAS | audioXpress
www.seas.no/images/stories/design/pdf_datasheet/L26ROY_Application_Note.pdf

Here it is suggested that the 4 layer version has a higher power handling
SEAS Expands In-House Production and Announces Extreme Subwoofer Series | audioXpress
The differentiation lies in the 4-layer, extremely long, high temperature voice coil wound on a titanium voice coil former, which gives it a high power handling capacity
Click to expand...
though the Seas website lists both woofers as 250/500 W.
XM001-04 L26ROY
XM004-04 L26RO4Y
 
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#6
Well the 4 layer version says it's a upgrade and usually things are improved when upgraded. However, I know some believe a low suspension losses (RMS) parameter leads to good dynamics but when it is too high? The 4 layer has a higher suspension loss parameter. 6.53 to 3.31 kg/s.
 
#10
As theorical as it is : Lower inductance induced distortion, because of 2 vs 4 layer voicecoil. But more weight on the cone, means somewhat a "mass" low pass, or compromise on cone stiffness. Since distortions are higher in frequency than input fundamental, mass, act, somewhat, as low pass for distortion. But at the same time, mass add big constraint on suspension, wich on it own adds distortion too. All a matter of compromises, as always 🙂
 
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