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post #1 of 54 Old 10-23-2019, 08:00 PM - Thread Starter
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Operation Wife Bypass

It’s easier to ask for forgiveness than beg for permission. I’ve made my fair share of fire wood from projects that didn’t work out so rather than trigger my wife’s OCD having the living room look like a workshop, I figured I’d build something substantial offsite (friend’s house) and sneak these in place, which is probably doable having ah AT screen because there’s little reason to look back there.

After a lot of back and forth with @aron7awol who was a tremendous help, I settled on 4) enclosures turned to 15.3hz with two 5.5” square ports 48” long and 13.2 cubic feet net enclosures. I currently have an SK horn which I really like but when I had to move locations to accommodate my mini refrigerators (JBL 4722s) i ultimately just decided to try something I never had before. Also thanks to @Gorilla Killa as he answered a lot of my questions as well prior to settling on my final recipe.

I’ve decided not to rely on one location and hope for the best. I’m gonna have two Eminence NSW 21s driven by an FP14K clone with one each corner to do the heavy lifting. Enclosure size: 86” tall x 16” deep and 24” wide using 3/4” Baltic Birch with a 1” thick BB front baffle (not much depth to spare). The B&C 21ds115s currently in the SKhorn will be repurposed and will have the same internal volume and tune but one will have have different dimensions which will go on a shelf that I built that goes over the JBLs with the other being nearfield. Very nearfield is a whole nother project. The B&Cs will be driven by two channels of an FP10kq. I’ve got the shells almost ready to go for three enclosures. Now I’ve gotta settle in on bracing. More to come.
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Last edited by gpmbc; 10-23-2019 at 08:05 PM.
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post #2 of 54 Old 10-23-2019, 08:51 PM - Thread Starter
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Just a comparison of how closely the B&C and Eminence compare in this application.
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post #3 of 54 Old 10-24-2019, 08:15 AM
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Hey, how are you? I did not even know you built a SKhorn. It has the BC21s? Not Ipals? How do you like it? What were you coming from? Remember the Madison's? The folded horn had good midbass.

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post #4 of 54 Old 10-24-2019, 08:48 AM - Thread Starter
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Been great man! My SKHorn has the 4 ohm B&Cs, love that thing, percussive for sure. Before that I had some ported AE 18s up front and UXL 18s nearfield. I’ve had so many different combinations over the years and more than once I was good to go but didn’t realize how good until I tried something new and lost what I had prior... the AVS rabbit hole. I remember the Madisons. The dual 18 is at my Crossfit box so I hear it all the time. Crazy that thing can fill a whole warehouse.
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post #5 of 54 Old 10-24-2019, 09:10 AM - Thread Starter
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Current set up behind the screen . The Eminence will be on the left and right of the mains with the drivers facing each other from about 10.5 feet away. The shelf will hold the one with the 21ds115.
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post #6 of 54 Old 10-24-2019, 09:25 AM
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Quote:
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Current set up behind the screen . The Eminence will be on the left and right of the mains with the drivers facing each other from about 10.5 feet away. The shelf will hold the one with the 21ds115.
Nice, The JBLs! You can't go wrong with those! Do you cover up the lights from the receiver and amps behind the screen? I have built things my wife never knew about.

I am back to sealed again, just love the ULF it provides in my room. Of course hoping my room still provides the gain it once did. It should with the same dimensions.
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post #7 of 54 Old 10-24-2019, 09:38 AM - Thread Starter
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Yes, I cover up the lights and I also have a velvet border at the bottom that covers as well. I almost went with a slew of sealed subs but had 8) SI 18s once before so wanted to try something new. I’ve never had pro drivers, tuned this low in boxes this big, just trying to abide by Hoffman’s Law.
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post #8 of 54 Old 10-24-2019, 09:48 AM
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Quote:
Originally Posted by gpmbc View Post
Yes, I cover up the lights and I also have a velvet border at the bottom that covers as well. I almost went with a slew of sealed subs but had 8) SI 18s once before so wanted to try something new. I’ve never had pro drivers, tuned this low in boxes this big, just trying to abide by Hoffman’s Law.
I know what you mean. I am now addicted to high excursion drivers, so I want either more RE XXX-18 or the 24.

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post #9 of 54 Old 10-24-2019, 11:21 AM
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It looks like you saved your wife some time by building coffins for you and your friends that are helping you with the project. That's very nice of you saving her those arrangements after she discovers these subs and goes on a rampage.

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post #10 of 54 Old 10-24-2019, 11:41 AM - Thread Starter
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LOL, I think the initial reaction will be a head shake followed by “more subwoofers?! You just built....” After that, I think she will be impressed that I managed to build, bring them in the house and put them in place without her knowing. Pats self on back.
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post #11 of 54 Old 10-24-2019, 12:49 PM
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I really believe that once you have been through so many builds the wife acts upset but she realizes it makes you happy and moves on, mine does. They have to put on the show though as it can not be that easy for us.

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post #12 of 54 Old 10-24-2019, 01:17 PM
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I really believe that once you have been through so many builds the wife acts upset but she realizes it makes you happy and moves on, mine does. They have to put on the show though as it can not be that easy for us.


My fiancé was thrilled when I told her I was canceling my sonosub build and returning the tubes. At least until she realized there was a catch. Submaxes arent THAT much bigger

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post #13 of 54 Old 10-24-2019, 02:09 PM - Thread Starter
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@a77cj7 Nice, what drivers are you using?
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post #14 of 54 Old 10-24-2019, 02:26 PM
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@a77cj7 Nice, what drivers are you using?

Stereo Integrity HST18’s
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post #15 of 54 Old 10-24-2019, 02:38 PM - Thread Starter
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No shortage of output there. The Submaximus was definitely on my list of considerations but they’re....HUGE so it just wasn’t practical to try and accommodate them.
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post #16 of 54 Old 10-24-2019, 02:38 PM
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This is epic. Can't wait to hear it. Keep it up!
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post #17 of 54 Old 10-24-2019, 02:50 PM
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No shortage of output there. The Submaximus was definitely on my list of considerations but they’re....HUGE so it just wasn’t practical to try and accommodate them.


Thats the plan.
The LLT sonosubs I designed were 25x25x87. The submax is 25.5x36x80. The same locations work with the extra width, and I installed a BOSS to cover the ULF.
It should be fun.
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post #18 of 54 Old 10-24-2019, 03:06 PM
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Wait, sonosubs are round and mine were 26 by 72.

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post #19 of 54 Old 10-24-2019, 03:19 PM
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Operation Wife Bypass

Quote:
Originally Posted by MKtheater View Post
Wait, sonosubs are round and mine were 26 by 72.

Yep, i was using 24” outer tube, outside diameter 25”. Hence 25x25.
I was going taller to gain volume, 78” tube length. Add endcaps and legs, overall height = 87”.
Where I’m putting them, 26” is a depth limit. Ceiling is 7’9-7’10. 36” width is limit.

Sorry for taking your thread off topic @gpmbc
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post #20 of 54 Old 10-24-2019, 05:31 PM
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My SKHorn has the 4 ohm B&Cs, love that thing, percussive for sure. Before that I had some ported AE 18s up front and UXL 18s nearfield. I’ve had so many different combinations over the years and more than once I was good to go but didn’t realize how good until I tried something new and lost what I had prior... the AVS rabbit hole.
That's why you should just keep adding rather than changing, silly rabbit!

Will you be getting a dsp FP or do you have external DSP already?
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post #21 of 54 Old 10-24-2019, 07:47 PM - Thread Starter
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That's why you should just keep adding rather than changing, silly rabbit!

Will you be getting a dsp FP or do you have external DSP already?
The thought of keeping the SKhorn in place did cross my mind but part of what prompted the change is it lost some of its wow factor (midbass snap of all things) when I moved it to practically the one location available. I had it VNF at one time and it was crazy but localized to say the least. Trying to match the output up front to have it more balanced would be a losing battle and the cycle begins LOL. I never did consider it going back nearfield again with just the Eminence up front 🤔... oh no rabbit hole again. I’ve gotta MiniDsp 2x4hd that I haven’t got familiar with yet. That’ll obviously have to change.
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post #22 of 54 Old 10-25-2019, 03:19 PM
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Looking at your enclosures seems you aren't far too far from Submax's, those are quite large. Nice to have some impressions coming from the SK to ported and the B&C to NSW. Glad to see your moving right along. I need to do the same.

8hz ULF TR for the masses and the Cashless. Like a BOSS


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post #23 of 54 Old 10-25-2019, 06:33 PM - Thread Starter
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@Gorilla Killa It would take two of mine and then still be 6 cubic feet less than one Submaximus 😮. I do really like the dimensions. Being so tall, it’s so lift friendly for two people vs something compact. Looking to get the ports in place this weekend and then go from there. I was gonna do an L and port out the front. Instead, I’ll just do two long straight and go out the top.
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post #24 of 54 Old 10-26-2019, 09:28 AM - Thread Starter
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@aron7awol I know with the enclosure being as tall as it is, standing waves is an issue. What’s the best orientation for pillows and how many would be ideal?
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post #25 of 54 Old 10-26-2019, 09:34 AM
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Pillows will kill standing waves most effectively when they are near the midpoint of that long 86" dimension, but you also don't want to totally block airflow between the upper and lower halves of the enclosure, so I like an approach where you offset two pillows where each blocks half (or a bit more than half) of the cross-sectional area, but the offset creates room for air to flow between the upper and lower halves of the enclosure.

Something like this rough illustration (not to scale):

fill35U and LTD02 like this.

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post #26 of 54 Old 11-13-2019, 05:00 PM - Thread Starter
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Before I decided to do 2 long straight ports, I already had the panels glued into place. Talk about counter productive. That definitely tacked on some time. Here’s the basic layout. The boards with the three lines going to them will be removed. They are just to hold up the other structure to make it easier to put into place.
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post #27 of 54 Old 11-13-2019, 05:04 PM - Thread Starter
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An elongated view, the 6 pieces laying down will be standing up on top of the ports to provide more contact area once the lid goes on.
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post #28 of 54 Old 11-19-2019, 07:40 AM
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Quote:
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An elongated view, the 6 pieces laying down will be standing up on top of the ports to provide more contact area once the lid goes on.


Well with no updates in 6 days... his wife must have found out what he was up to and didn’t forgive him... but she at least had a “casket” already made for him!
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post #29 of 54 Old 11-19-2019, 09:02 AM - Thread Starter
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Man, with an 11 month old and work, it has been harder than expected to break away and help my buddy with “his theater” LOL. I did make some headway yesterday. I hope the weekend will be my big window of opportunity. My cover was almost blown. My buddy had a moment and asked while she was in the room if I installed my subwoofer yet. She was like huh, and gave the look like she was onto me.
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post #30 of 54 Old 11-19-2019, 09:14 AM
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This is a pretty ambitious project for flying under the radar. The cabinets will definitely need some type of stealth coating if not active camouflage. If this were me attempting this, I would just filing the paperwork to save everyone some time right now

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