Passive speaker SEAS SL26R, Extreme, 10.59 inch

Customer reviews

Review by Jonmarsh on 1/31/23

The SL26R XM003 is an updated design to the original SL26R D1003, which I have used before. The most obvious visual difference is a new basket design with a different spoke configuration. However, there are some differences in physical parameters which should be kept in mind doing a new design, unless perhaps you are just pairing it with the 10" LROY woofer, as Seas intends. My applications have always been what you would label in the medical world as "off label"; I.E., not the original intended usage.
The Sd, maximum travel, and moving mass MMs are the same for both, but the new version differs in suspension compliance, 0.29mm/N, resulting in a VAS spec of 50L versus 93L for the original D1003 part.
My "off label" application is a system in development for a boutique assembler, in two configurations, one with our 8" woofers of one type and 4 of the PR's per cabinet; the other is with a different 8" woofer and only two per cabinet and two PRs.
This design requires changing the mass loading of the SL26R, from the default configuration of 273g to about 350g. The SL26R has a removable M4 bolt which can be used to add additional mass via fender washers or the like, but disks are not provided by Seas with the SL26PR, given it's nominal dedicated application concept.
For the intended application example with 4 - 8" woofers (with a 9mm Xmax) the overall parameters and performance target suggest a net enclosure volume of 130L for the drivers, (8's arranged in a column at the enclosure front) and a PR mass of 350g. For this driver set and volume, an F3 of 26Hz will result, with an Fb of 24 Hz. Increasing the enclosure size beyond this point has limited effectiveness- for example, 150L sets the F3 to 25Hz, with an Fb of 23Hz.
Note that one of the prime selection criteria for the SL26R has been Seas's assiduous attention to suspension linearity, and has even withheld shipments in the past when it was discovered that supplier materials weren't quite up to snuff in that regards. This is important for a long travel woofer or PR, because if the compliance changes under excursion, this literally changes the tuning of the system during the stroke, which impacts amplitude, and of course that is distortion from the PR, not the primary woofer.
And besides this, they are very well built and look nice, and reasonably priced for the quality and performance received.

Quality
Price
Note: 4.5/5 0

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