Seas L26ROY

[Rick Craig]

Looking good! +0/-3db 29-56hz with equalization, -10db@19hz in about 1 cubic ft. sealed box. All tests nearfield with the O Audio 500-watt amp.

[HareBrained]

Yup. Great driver if you can afford it.

[Jed]

I posted my tests awhile ago in the driver testing section of the forum, but just in case people were interested in seeing the results here as well:



Harmonic distortion

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Frequency response of L26Roy (in box full gate):

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[Face]

That's impressive for a sealed enclosure.

[Paul Ebert]

Impressive distortion as well. Seems like you could cross it over pretty high. How's it sound compared to the others you've tested, Jed?

[Jed]

Impressive distortion as well. Seems like you could cross it over pretty high. How's it sound compared to the others you've tested, Jed?

One word. Amazing.

This "sub" does it all. Allows high crossover points, smooth response, low distortion, plenty of xmax, and most importantly it sounds great. They go very deep in a sealed box, which is how I'm listening to them right now (ported they will play in the low 20s in a small box). They are also fairly sensitive which is a huge plus if using them in a 3 way speaker.

[tf1216]

Jed,

Did you perform the same measurements on the 26W/8867T? What did you end up doing with the woofer?

I think it is an all-time great woofer.

[Jed]

Jed,

Did you perform the same measurements on the 26W/8867T? What did you end up doing with the woofer?

I think it is an all-time great woofer.

The 26W has lower harmonic distortion than the L26ROY (as can be seen in my driver tests section of my website) but it is also more expensive. It too has a flat FR. I like them both but you can't ignore the xmax of the Seas unit and the overall performance.

[Rick Craig]

One word. Amazing.

This "sub" does it all. Allows high crossover points, smooth response, low distortion, plenty of xmax, and most importantly it sounds great. They go very deep in a sealed box, which is how I'm listening to them right now (ported they will play in the low 20s in a small box). They are also fairly sensitive which is a huge plus if using them in a 3 way speaker, as I did in the Aria 10S (renamed Tombstones).

I agree that it's a great driver but I'm not so sure about it being -2.5db @39hz in a sealed box without any equalization. Try doing a nearfield response curve.

[Jed]

I agree that it's a great driver but I'm not so sure about it being -2.5db @39hz in a sealed box without any equalization. Try doing a nearfield response curve.

The response curve I posted above +/- 2.5db excluding the cone breaup- it's pretty clear that it extends just below 40hz. I was surprised as well.

Most of my measurements below 200hz include nearfield data spliced in. This isn't a farfield in room response with low resolution depicting room gain.

[Paul Ebert]

I do wish it was black. Other than that, it looks pretty ideal.

Hmm... L26ROY, a pair of SB15NRXC30-4s (when they are available) and a SB29RDC (or, perhaps, better yet - SB29RDCN when they are available). A "poor man's" Aria10?

[Jed]

I do wish it was black. Other than that, it looks pretty ideal.

Hmm... L26ROY, a pair of SB15NRXC30-4s (when they are available) and a SB29RDC (or, perhaps, better yet - SB29RDCN when they are available). A "poor man's" Aria10?

Anything is po$$ible. :W Seriously, I have a list of speakers to develop and something like that crossed my mind.

[Jed]

I do wish it was black.

The new Peerless units fit that bill. Not sure how usable they are up high, though.

[Rick Craig]

The new Peerless units fit that bill. Not sure how usable they are up high, though.

I have the new 12" and will be testing it in a few weeks.

[Jed]

I have the new 12" and will be testing it in a few weeks.

Nice. The one thing that has always held me back from Tymphany based stuff is availability in the future. Pity, because a lot of the drivers they make are very good...

Hopefully with the new reorganization of the lines things will turn around. I have my fingers crossed.

[Paul Ebert]

I have the new 12" and will be testing it in a few weeks.

I assume this is the 835017 XXLS? It, too, looks like a nice driver. No sign of copper in the motor, however.

I'll be very interested in how it compares.

[Bastek]

It looks like Rick's dual L26ROY subs are ready, they can be matched with his new MTMs, it looks like a great set. I love separate box designs.

Images not available

[Silversmoky]

Beautiful setup! I really like the looks of the dual L26ROY's.

[Jed]

I love separate box designs.

How do you like them Bastek?

[Bastek]

How do you like them Bastek?

Dual boxes are easier to move and setup and are more flexible than single cab designs. The tops can be placed on stands and placed 3-6 ft away from subs, assuming the xo point is low enough, giving a better response in difficult rooms. Like these BAs i use currently
They look better as full towers:





But they sound better in this configuration:

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And my SSRs can go on that stand, for an even better sound.

[chrismercurio]

(Sorry to bring up old stuff)

To Jed and Rick:

How high do you feel this can be crossed over when used as a woofer instead of a subwoofer?

[Jed]

(Sorry to bring up old stuff)

To Jed and Rick:

How high do you feel this can be crossed over when used as a woofer instead of a subwoofer?

It's pretty clean up high; so figure 400hz cutoff.

[David G]

I'm seriously considering this driver in an upcoming design, but I want to know how high in frequency can it really go.
The graphs say >1 kHz, but that says little about how it sounds. The nearly 100g Mms has me concerned.
I need a driver that will do 1st order at 300Hz so it has to be able to do vocals extremely well. Jed, how high are you taking it?

[Jed]

I haven't tried them first order, just 2nd or 3rd acoustic around 300-400 Fc. If you look at my HD plot there is some higher order products that you'll want to avoid around 750hz, so that will definitely be more audible with a 1st order acoustic slope.

[David G]

Thanks Jed.
Upon reflection, I think its best that I aim for 200Hz 2nd order, and that will keep the higher order harmonics well in check.

[chrismercurio]

It's pretty hard to find any driver, especially one with a really stiff cone that will hold up to 1st order filtering.

[Rick Craig]

I'm seriously considering this driver in an upcoming design, but I want to know how high in frequency can it really go.
The graphs say >1 kHz, but that says little about how it sounds. The nearly 100g Mms has me concerned.
I need a driver that will do 1st order at 300Hz so it has to be able to do vocals extremely well. Jed, how high are you taking it?

This depends on how far down you want the breakup to be. For some designers 15-20db is acceptable while others prefer 40-50db. The moving mass isn't as much of an issue because of the motor's low inductance.

[xyrium]

Just to confirm. Rick mentioned a 1.0 cu ft box. Is that what your tests were run on as well Jed?

[Jed]

Just to confirm. Rick mentioned a 1.0 cu ft box. Is that what your tests were run on as well Jed?

I did mine in the cabinet in Post #3. ~48-50L.

[xyrium]

Ok, thanks Jed. I suppose I'll be in good shape with a 1.5 cu ft cab then. I'll run the numbers in WinISD just to make sure I'm not way off. Thanks!

[johngalt47]

.frd and .zma

In case anyone needs them, I just used SPL Trace and the L26 factory data to generate these .frd and .zma files.

[Fdas]

It looks like Rick's dual L26ROY subs are ready, they can be matched with his new MTMs, it looks like a great set. I love separate box designs.

Images not available

These are incredibly beautiful.

[johngalt47]

L26 + passive radiators

I noticed on the Seas web site that they now have passive radiators designed for the L26. Has anyone tried a build using them and/or does anyone have an opinion of the possible results?

[Jed]

I noticed on the Seas web site that they now have passive radiators designed for the L26. Has anyone tried a build using them and/or does anyone have an opinion of the possible results?

I don't think Madisound has it yet.

[David G]

I've today completed a pair of subs using the L26ROY to go with my new mains. Cabinets were recycled from an earlier effort. Looking forward to giving them a real workout.




Impressive chassis and motor for a reasonable price.

[Johnloudb]

Nice work David! ;x( ;x( What drivers and crossover type (first order?) did you use for your mains? What do you think of the sound?

Let us know how your subs sound, once you get them some playing time.

[David G]

Thanks mate.
The mains are still in progress ... probably 2 months before the crossovers are done and I can give my thoughts on the sound. Crossovers will likely be 1st order, as usual.

[Face]

https://www.madisound.com/store/product_info.php?products_id=8867&osCsid=245305856ee977e901c84fa8eea77493

[JonMarsh]

Whoa, just what a fellow would need to create some lease breaking mini-subs! Say, the Dayton 2 cu ft, which would supply enough volume to allow for that subtracted for the driver and PR volume.

[tktran]

What about one l26roy paired with two sl26 passive radiators?

Or would it make more sense to have two l26roy?

[Jed]

Passive radiators are similar in function as a port but without the noise, and it allows the driver to work in a smaller volume where a port would otherwise have to be too long. So dual L26ROYs in a sealed box would go to the same F3 as a single, given the box volume is exactly double. Therefore, the L26ROY with one passive will go lower in the same size box as a sealed sub and using two passive radiators will increase the excursion capabilities.

[tktran]

Hi Jed.

Thanks for the clarification in re: to two active drivers in a box double the size of a single driver in a sealed box, but having 6dB extra output. I also understand a little about PR systems. eg. tuning PR's based on ported alignments.

Most people seem to use 1 PR, or a single PR of a larger size. Less often I use two PRs mated to a single active driver.

What I'm trying to figure out is the displacement requirements of the passive radiator. What is this a (mathematical) function of?

[Jed]

You can model the T/S parameters of a subwoofer to see how X volume with Y number of passives will work in the intended volume and how the properties of the passive (adjusting the mass... etc) will hit the desired tuning. The advantage of using dual passives is that you can have greater SPL capabilities before running out of usable excursion. So depending on how loud and low you want to tune it, you can decide if you need 1 or 2 passive radiators. Unibox will give you all you really need to design a proper box using passive radiators, and if you do end up going with the L26ROY, Seas has a recommendation for using 1 or 2 passives on their website.

Jed

[johngalt47]

I just got my L26ROY and tested it using WT3. I just sat it down horizontally on its magnet and these are the results:

Re : 3.125
Fs : 31.63
Qts : 0.4758
Qes : 0.5085
Qms : 7.393
Le : 0.8268

[Jed]

To accurately test T/S parameters, the frame should be secured on a rigid test baffle/box, with it mounted vertically. This is why the added mass method gives not the most accurate results.