Simplex 21" Drivers

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mj90210
Posts: 53
Joined: Fri Feb 03, 2017 2:12 pm
Location: Montana-USA

Simplex 21" Drivers

#1 Post by mj90210 » Sun Jun 28, 2020 11:51 pm

Hello,

Recently there have been 21" drivers released that are little less expensive the the Eminence NSW-6021. One is made by Dayton and the other by Lavoce. I understand the simplex 21 was designed for the Eminence but I figured I would ask. Would it be worth it or even possible to keep the box volume the same but change the length of ports to accommodate either driver? I "played" around in WinISD using the Simplex 21 enclosure specifications but results didn't warrant the the savings of $300, at least for myself.

However the Dayton seems like a decent driver for the money, maybe it is worth a modification even as a home theater model.

Let me know your thoughts.

https://www.parts-express.com/dayton-au ... m--295-050
Thank You All for Your Time!!...Really!

Built:
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jimbo7
Posts: 703
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: Simplex 21" Drivers

#2 Post by jimbo7 » Mon Jun 29, 2020 6:45 pm

I've never looked at those plans. Wow what a monster driver the Eminence is!

I don't understand why you wanna redesign it. The Dayton driver will work based on the recommended specs.
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

Bruce Weldy
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Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Simplex 21" Drivers

#3 Post by Bruce Weldy » Mon Jun 29, 2020 7:13 pm

jimbo7 wrote:
Mon Jun 29, 2020 6:45 pm
I've never looked at those plans. Wow what a monster driver the Eminence is!

I don't understand why you wanna redesign it. The Dayton driver will work based on the recommended specs.
+1

Specs are indeed really close.....other than xmax.....21mm for the Eminence and 11mm for the Dayton. Have to keep the voltage within reason....of course, wanting a 21 in. driver means that reason is pretty much left the barn, right? :mrgreen:

6 - T39 4-25" 2-22" 3012LF
4 - OT12 2512 Melded/NSD2005
1 - T24
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Strange Kevin
Posts: 85
Joined: Fri May 19, 2017 3:02 pm
Location: Scottsdale AZ

Re: Simplex 21" Drivers

#4 Post by Strange Kevin » Mon Jun 29, 2020 10:29 pm

The Fs and and Qts are close enough, but the Vas is about double on the Dayton (442 Liter) compared to the Eminence (225L).

At less than half the price it might be worth the trouble... but with the shorter Xmax, I doubt it would beat the recommended driver the the S18 - Home Theatre.
Authorized Builder - Phoenix AZ.
Main Rig - 6 DR200s - 6 T48s (30")
SLA Pros for the smaller stuff.

jimbo7
Posts: 703
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: Simplex 21" Drivers

#5 Post by jimbo7 » Tue Jun 30, 2020 7:57 am

Strange Kevin wrote:
Mon Jun 29, 2020 10:29 pm
The Fs and and Qts are close enough, but the Vas is about double on the Dayton (442 Liter) compared to the Eminence (225L).

At less than half the price it might be worth the trouble... but with the shorter Xmax, I doubt it would beat the recommended driver the the S18 - Home Theatre.
You gotta pay to play.

From what I understand of VAS is that the Eminence is a more efficient speaker and needs less power to move the cone to produce the same results. Please correct me if I'm wrong.
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

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Bill Fitzmaurice
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Joined: Tue May 02, 2006 5:59 pm

Re: Simplex 21" Drivers

#6 Post by Bill Fitzmaurice » Tue Jun 30, 2020 8:04 am

Vas only major effect is on the size of the box.

jimbo7
Posts: 703
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: Simplex 21" Drivers

#7 Post by jimbo7 » Tue Jun 30, 2020 2:36 pm

Bill Fitzmaurice wrote:
Tue Jun 30, 2020 8:04 am
Vas only major effect is on the size of the box.
I did notice that the Dayton vented volume is almost 3x greater
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

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