Custom PSI Audio Platform 3 18s – Another Eng-399 Build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 204 Old 03-04-2018, 08:19 AM - Thread Starter
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Baba Yaga – Another Eng-399 Build - PSI Audio custom 18s

Quote:
Originally Posted by Viggo Tarasov
That "****in' nobody"... is John Wick. He once was an associate of ours. They call him "Baba Yaga".


My current substage consists of a pair of custom built for HT PSI Audio 12” Platform 2 drivers in DIYSG 4 cube enclosures tuned to 19.5 Hz. These have provided me effortless response to 15hz and more than enough capability to skip a heartbeat. However, upgraditis is a very real condition, and over the course of a few years I’ve come to realize that the 18” driver is considerably more suitable for my… “needs”.

Pair that with PSI Audio’s excellent communication, customer service, and Black Friday deals, and a few weeks later and Mr. FedEx is struggling to move these monsters into my front room.







Mike (@eng-399;) is a good friend and quite local to me. As we all know he has the knowledge, skills, tools, and experience to bring the wholesome goodness of gratuitous LFE to home theaters. As such, he is tasked with the design and build for my new subs. I’ll be handing off the technicals of the build to him.

To say I’m excited about this build and the upcoming results of this build would be an understatement.






I’m actually a little scared… Which is why I'm calling this build "Baba Yaga"!

Last edited by JCJetta; 03-27-2018 at 08:06 AM.
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post #2 of 204 Old 03-04-2018, 08:24 AM
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Congratulations on your new subs. I'm sure Eng-399 will build a great cabinet(s) and I look forward to seeing the build progress!
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post #3 of 204 Old 03-04-2018, 08:26 AM
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Hmm, wonder what name Eng will go with this time? Very nice looking drivers. Should bring a Mouth for War. Ported I assume?

Typed on a tiny keyboard, excuse any typos
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post #4 of 204 Old 03-04-2018, 08:26 AM
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Last night was fun getting to hear your room again and measuring these New monster PSI subs you bought. I’m glad we where able to figure out the Datsv2 and get a measurement from it with a little help from Matt Poes. I’m excited to build these for you the 18’s will be fun to here since your coming from 12’s. I’m going to draw up plans sometime today for it.
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post #5 of 204 Old 03-04-2018, 08:27 AM
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Quote:
Originally Posted by JCJetta View Post
I’m actually a little scared…it still wont be enough
Fixed it for you.

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post #6 of 204 Old 03-04-2018, 09:03 AM
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Hat's off to Eng399 for helping out another forum member.
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post #7 of 204 Old 03-04-2018, 01:16 PM
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Quote:
Originally Posted by Rowan611 View Post
Hmm, wonder what name Eng will go with this time? Very nice looking drivers. Should bring a Mouth for War. Ported I assume?

Typed on a tiny keyboard, excuse any typos


Love that album! I like your thinking to where going to have to figure out a name for these...
Hmmm what should these boxes be called.
Here’s some more pictures of the subs there beastly in person!
Jc I just got back home and going to start a cut list for them.

Baltic birch for this build 60-60” sheets!
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post #8 of 204 Old 03-04-2018, 01:29 PM
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Quote:
Originally Posted by eng-399 View Post
Love that album! I like your thinking to where going to have to figure out a name for these...
Hmmm what should these boxes be called.
Here’s some more pictures of the subs there beastly in person!
Jc I just got back home and going to start a cut list for them.

Baltic birch for this build 60-60” sheets!
It's definitely my favorite Pantera album. I'll be buying some 60x60 sheets soon also. Are you going to be using 3/4" BB? That's a hefty price. Wouldn't 1/2" be enough? Can't wait to watch these come together.

Typed on a tiny keyboard, excuse any typos
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post #9 of 204 Old 03-04-2018, 02:10 PM
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Custom PSI Audio Platform 3 18s – Another Eng-399 Build

JC's Custom--------18''- PSI Leval 3 Home Theater sub

Box size--

50 iches wide 28 inches height 16.75 inches depth

external cubic ft. 13.57 cubes

internal after bracing, driver, slot port 9.5 cubic ft.

15hz. tune with a 1st port resonance 150.84hz.

Air Port Velcity at ''max'' is 20.601 ms at 14.79 hz

The port length via WINISD 0.7.0.900 calls for a vent length of 44.85 but where going to extend it and have it three inches short to the back wall to bring down the port tune a tad. The Dayton Audio DATSV2test device will measure the exact tune once the box is complete.

Cutlist-for 2 boxes

(4)-Front /baffle---50''/28''

(2)-Back-50''/28''

(2)-Side 1 non port side-26.5/14.5''

(2)-Side 2 port side14.5''/23”

(2)-TOP 14.5''/50”

(2)-Bottom-14.5''/50”

(2)-Port panel-14.5''/46''

(2)-port rail - 2.75”/49.25”

(8)-window bracing- 23”/14.5”


Last edited by eng-399; 03-06-2018 at 12:14 AM.
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post #10 of 204 Old 03-04-2018, 02:19 PM
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WWJCD?


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post #11 of 204 Old 03-04-2018, 02:53 PM - Thread Starter
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Quote:
Originally Posted by EndersShadow View Post
WWJCD?


Sent from my iPhone using Tapatalk (so ignore any typos grammatical errors because my iPhone predictive text stinks)
Between all the learning on REW last night tweaking my 12s (which now sound dramatically better and have actual midbass I was missing before) to WINISD with Mike explaining... I'm gonna sit back and watch Mike with this build and enjoy the ride.

Sent from my SM-G930P using Tapatalk
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post #12 of 204 Old 03-04-2018, 02:55 PM
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Quote:
Originally Posted by JCJetta View Post
Between all the learning on REW last night tweaking my 12s (which now sound dramatically better and have actual midbass I was missing before) to WINISD with Mike explaining... I'm gonna sit back and watch Mike with this build and enjoy the ride.

Sent from my SM-G930P using Tapatalk


Not a bad idea at all.


Sent from my iPhone using Tapatalk (so ignore any typos grammatical errors because my iPhone predictive text stinks)
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post #13 of 204 Old 03-04-2018, 03:31 PM
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Quote:
Originally Posted by eng-399 View Post

The port length via WINISD 0.7.0.900 calls for a vent length of 44.85 but where going to extend it and have it three inches short to the back wall to bring down the port tune a tad. The Dayton Audio DATSV2test device will measure the exact tune once the box is complete.

Is this normal for 0.7.0.900? I'm using the same version, modeled a B&C 21" and it showed the same vent length?
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post #14 of 204 Old 03-04-2018, 05:38 PM
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Quote:
Originally Posted by mumbles60 View Post
Is this normal for 0.7.0.900? I'm using the same version, modeled a B&C 21" and it showed the same vent length?


Hmmm going to jump on now and see what’s up. Thanks for posting that!!
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post #15 of 204 Old 03-04-2018, 05:46 PM
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Quote:
Originally Posted by mumbles60 View Post
Is this normal for 0.7.0.900? I'm using the same version, modeled a B&C 21" and it showed the same vent length?

Were you modeling the same net box size and tune? If so the driver is irrelevant the vent volume determines the BOX tune.
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post #16 of 204 Old 03-04-2018, 06:01 PM
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Quote:
Originally Posted by PsychoM3 View Post
Were you modeling the same net box size and tune? If so the driver is irrelevant the vent volume determines the BOX tune.
In small vented boxes, it is possible that a change to a different driver with a radically larger or smaller motor volume can change the effective tune.

Ask your doctor if DIY is right for you. Side effects of DIY may include anxiety, elevated blood pressure, lightheadedness, rapid heartbeat, skeletal muscle flaccidity, euphoria, psychological dependence, insomnia, confusion, blurred vision, implusivity, uncontrolled or repeated movements.
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post #17 of 204 Old 03-04-2018, 06:17 PM
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Quote:
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In small vented boxes, it is possible that a change to a different driver with a radically larger or smaller motor volume can change the effective tune.
That would show up in an impedance sweep in a case where it occurred but I don't think it will show in WinISD. I have never seen it and if you have an example that shows different in WinISD I would like to see it, I have never been able to find a situation that changed the vent volume with just a change of driver in the program.
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post #18 of 204 Old 03-04-2018, 06:19 PM
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Those parameters look pretty nice
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post #19 of 204 Old 03-04-2018, 06:25 PM
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Quote:
Originally Posted by PsychoM3 View Post
That would show up in an impedance sweep in a case where it occurred but I don't think it will show in WinISD. I have never seen it and if you have an example that shows different in WinISD I would like to see it, I have never been able to find a situation that changed the vent volume with just a change of driver in the program.
You are correct, it will not be seen in a simulation, only in a measurement of an actual box.
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post #20 of 204 Old 03-04-2018, 06:39 PM
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Yikes!!!! 384.30$ for 6 sheets of Baltic Birch plus tax....
here's the cuts for this guys I just down loaded this cut list program right now off the web. The port rail is missing because the free program won't go over 5 cuts I guess you have to pay for it to have more options oh well... close enough for me
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post #21 of 204 Old 03-04-2018, 06:57 PM
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post #22 of 204 Old 03-04-2018, 07:30 PM
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what'd the drivers set you back per?
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post #23 of 204 Old 03-04-2018, 07:42 PM
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Quote:
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what'd the drivers set you back per?

They are listed at $525 on the PSI website.
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post #24 of 204 Old 03-04-2018, 07:43 PM
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They are listed at $525 on the PSI website.
That's really good for those specs. re:le is low, bl^2re is high, fs is good. Would like to see a little less mms, but those look awesome.
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post #25 of 204 Old 03-04-2018, 07:43 PM
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I've never seen plywood or similar material sold in a 60"x60" size. Bizarre...
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post #26 of 204 Old 03-04-2018, 07:57 PM
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Quote:
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I've never seen plywood or similar material sold in a 60"x60" size. Bizarre...
Basically all Baltic Birch is sold as 5x5 sheets it works really well for building cabinet boxes which is its main use.
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post #27 of 204 Old 03-04-2018, 08:13 PM
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Quote:
Originally Posted by PsychoM3 View Post
Basically all Baltic Birch is sold as 5x5 sheets it works really well for building cabinet boxes which is its main use.
4x8 sheets are also available in Baltic Birch, some suppliers can get it in 5 x 10 sheets also:


http://www.langevinforest.com/en/con...er-russe-4-x-8

https://www.builddirect.com/p/Welldo...-4x8--15095530

https://www.andersonplywood.com/305/baltic-birch/

http://www.starrforest.ca/wp-content...PLYWOOD-EN.pdf

Ask your doctor if DIY is right for you. Side effects of DIY may include anxiety, elevated blood pressure, lightheadedness, rapid heartbeat, skeletal muscle flaccidity, euphoria, psychological dependence, insomnia, confusion, blurred vision, implusivity, uncontrolled or repeated movements.
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post #28 of 204 Old 03-04-2018, 08:16 PM
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Quote:
Originally Posted by notnyt View Post
what'd the drivers set you back per?


JC will have to give you the exact number but last night when I was over there he said just under 1k for them because of the Black Friday sale PSI was having when he bought them.
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post #29 of 204 Old 03-04-2018, 08:29 PM
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Quote:
Originally Posted by eng-399 View Post
Yikes!!!! 384.30$ for 6 sheets of Baltic Birch plus tax....
here's the cuts for this guys I just down loaded this cut list program right now off the web. The port rail is missing because the free program won't go over 5 cuts I guess you have to pay for it to have more options oh well... close enough for me
7 sheets of BB is going to cost me $161 plus tax. It's from Liberty hardwood in Ankeny, IA. In MN, the same 5x5 BB was $45 a sheet. So, I kinda of know your pain.

Have you tried a program called Cutlist? I don't know what program you're currently using, but Cutlist is free and awesome.

Here's the link.

http://delphiforfun.org/programs/CutList.htm

Subscribed. Going to be another awesome build. Come up with a name yet?

Typed on a tiny keyboard, excuse any typos
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post #30 of 204 Old 03-04-2018, 08:41 PM
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Quote:
Originally Posted by michael hurd View Post
4x8 sheets are also available in Baltic Birch, some suppliers can get it in 5 x 10 sheets also:


The VAST majority of BB in non-standard sizes is not TRUE BB ply. 5x5 doesn't ensure it is true BB but almost all non-5x5 is Chinese. The true BB usually has zero voids and doesn't off-gas like a Chinese factory. You can find decent Chinese sheet goods but it is hit and miss with brands and even lot to lot.
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