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Fun little "SQ" project I'm starting !


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I played it a bit free-air this morning and it works; I was pleased with that as the gap to the pole is less than an RE MT *laughs*

I do need to take note next time when assembling it that the surround pulled the coil forward a bit when I glued it together... need to start a few mm back when assembling it. Looks like 3-4mm or so off forward.

Light little coil (80 grams) and soft spider cannot overcome the surrounds desire to pull forward a bit :)

Should still get a good idea of performance and specs, though -- I need to re-build it with the other coil type anyway after a bit of testing

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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Measured the specs. Modeled sealed box response is super deep; this coil would do some work in IB in 10s and 12s and also great for moderate sized sealed.

Re : 7.25 ohms

Le : 1.08 mH (super low for an 8 ohm nominal on a 3" coil) **

Fs : 34.1 Hz

Qts : 0.75

Qms : 4.23

Qes : 0.91

Vas : 31 L

BL : 19.75

Cms : 95.18 uM/N

Sens : 83.1 dB 1w/1m

Mms : 228 grams

Linear x-max 70% BL : 22mm one-way

** Morel Ultimate with 2-layer coil is 1.33 mH with only 12.5mm x-max

So this coil worked out great for moderate to large sealed or IB -- I am putting it in small sealed to see how I like it. More linear drivers such as this tend to sound great even with a high Qtc sealed (see SI BM MKIII).

The other coil will have more wire in the gap so should drop Qts and Fs too (as it's heavier).

These speakers are with MINIMAL break-in as well.

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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Measured the specs. Modeled sealed box response is super deep; this coil would do some work in IB in 10s and 12s and also great for moderate sized sealed.

Re : 7.25 ohms

Le : 1.08 mH (super low for an 8 ohm nominal on a 3" coil) **

Fs : 34.1 Hz

Qts : 0.75

Qms : 4.23

Qes : 0.91

Vas : 31 L

BL : 19.75

Cms : 95.18 uM/N

Sens : 83.1 dB 1w/1m

Mms : 228 grams

Linear x-max 70% BL : 22mm one-way

** Morel Ultimate with 2-layer coil is 1.33 mH with only 12.5mm x-max

So this coil worked out great for moderate to large sealed or IB -- I am putting it in small sealed to see how I like it. More linear drivers such as this tend to sound great even with a high Qtc sealed (see SI BM MKIII).

The other coil will have more wire in the gap so should drop Qts and Fs too (as it's heavier).

These speakers are with MINIMAL break-in as well.

interesting.

how about a tube vid of it playing in a car? when you say moderately sized seal box are we talking like 1.5cbf for a 12?

Mind sharing how you obtain these measurements just for interest sake?

Thanks.

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Measured the specs. Modeled sealed box response is super deep; this coil would do some work in IB in 10s and 12s and also great for moderate sized sealed.

Re : 7.25 ohms

Le : 1.08 mH (super low for an 8 ohm nominal on a 3" coil) **

Fs : 34.1 Hz

Qts : 0.75

Qms : 4.23

Qes : 0.91

Vas : 31 L

BL : 19.75

Cms : 95.18 uM/N

Sens : 83.1 dB 1w/1m

Mms : 228 grams

Linear x-max 70% BL : 22mm one-way

** Morel Ultimate with 2-layer coil is 1.33 mH with only 12.5mm x-max

So this coil worked out great for moderate to large sealed or IB -- I am putting it in small sealed to see how I like it. More linear drivers such as this tend to sound great even with a high Qtc sealed (see SI BM MKIII).

The other coil will have more wire in the gap so should drop Qts and Fs too (as it's heavier).

These speakers are with MINIMAL break-in as well.

interesting.

how about a tube vid of it playing in a car? when you say moderately sized seal box are we talking like 1.5cbf for a 12?

Mind sharing how you obtain these measurements just for interest sake?

Thanks.

Suppose I could video it -- ~140 dB systems aren't that exciting :)

I am using a 1 cube box for my testing; a more moderate box would be flatter (1.5 to 2 cubes).

One of my favorite sealed woofers of all time was the Dayton Titanic 1200 (first version) - which called for 3 cubes sealed :drink40:

PS: Woofer Tester to get the specs / FEA package for the x-max

Edited by sundownz

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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  • 2 months later...

I've been driving around with the first prototype for some time now and I really do enjoy it quite a bit -- I haven't made one with the "beefier" coil yet but I believe that it will really perfect the sub and will likely be what I offer when these go up for sale... once I get a moment to work on my own stuff again I'll build one with the other coil to test.

I intend to make these publicly available for sale once the next run of NS v.2 motors arrives.

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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  • 2 weeks later...

So who would honestly buy one or know someone who would ?

MAP would be around $600 from an authorized dealer... but in the SQ realm that is not a ton for a reference level SQ 12" woofer.

I do plan to Klippel it once I get one built with the thicker coil.

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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