Pics of my new triangle shaped SI18 Box - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 17 Old 11-28-2014, 11:51 AM - Thread Starter
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Pics of my new triangle shaped SI18 Box

After a few months of trying to integrate a martycube into my system and failing, I decided to make a purpose built triangle shaped cab to fit behind my tv. Previously a ported diy 12 sat back there.

This box is 3/4 birch ply, 5.75 ft3 net, 5x5x24.75 port, 20hz, 23ms port velocity at 1200 watts.

The whole box used 1 sheet of ply plus an extra 2x2 of the same for the end caps. Only a single baffle.

Initial impressions are very good. No measurements yet but they're coming. With test tones I can get audible port noise with all the lights lit on the inuke at 25hz. Haven't heard any during normal listening so I think I'm good.

I think I lucked out with my room and this sub placement. Every seat sounds good and the rest of the floor also sounds good. Even the middle of the room.

I painted to match the wall and added two little decorative wood ornaments to the top of the port since it sticks out. We have similar shapes throughout the house.

Add two pics of the room for reference. But those were taken a while back.

Total cost was about $75.






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post #2 of 17 Old 11-28-2014, 01:26 PM
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Holy cow! No wonder you experienced problems integrating a sub into your system. That's a very open floor plan.

Good job with the rectangle. If only we all had the perfect rooms for audio.


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post #3 of 17 Old 11-28-2014, 01:32 PM
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Nice, I love the stealth of the design. The external port seems to have worked out nicely as well.
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post #4 of 17 Old 11-28-2014, 01:42 PM
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Nice, I love the design. Nice looking place too. Like the fact that you didn't take over the entire area with speakers and subs but you still the ability to use a sub. Nice job. Turned out great.
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post #5 of 17 Old 11-28-2014, 01:58 PM
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Very nice
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post #6 of 17 Old 11-28-2014, 02:28 PM - Thread Starter
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Thanks! The martycube is getting relocated to the basement where I can place it better. I've had success with this layout using any sub I put back there. The problem was fitting an 18 in such a tight space. So I tried placing the 18 in the right side corner but I couldn't get a good even response at more than two seats. My wife likes to sit in the furthest right seat where the cube sat but that was the worst seat because the delay was way off there.

I tried bracing the front baffle well to help the lack of a double baffle. Triangles are strong right! They build bridges out of them.
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post #7 of 17 Old 11-28-2014, 02:31 PM
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way to go, nice build! That is some fantastic integration there.

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post #8 of 17 Old 11-28-2014, 02:41 PM - Thread Starter
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Quote:
Originally Posted by cessna1466u View Post
Nice, I love the design. Nice looking place too. Like the fact that you didn't take over the entire area with speakers and subs but you still the ability to use a sub. Nice job. Turned out great.
Thanks. We built the house and we like to party so an open floor plan was a must have. Hiding the sub from our 4 year old son is also nice.

My basement will be more in your face style on purpose.
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post #9 of 17 Old 11-28-2014, 02:53 PM
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Nice, that's a great 'stealth' install
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post #10 of 17 Old 11-28-2014, 03:38 PM - Thread Starter
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I could have built the box to the height of the tv and made the port internal but this design allowed me to use the height of the ply at 48" with minimal cuts. It also helped keep the top and bottom edges a consistent height for a good seal on the end caps. Plus I drive a mazda3 hatch so fitting into the car is always an issue when I'm bringing wood home. Cutting 45s on the edges of the sides wasn't as hard as I thought it would be. A good Mikita circular saw and guide boards worked great. Careful measurements and square cuts are vital with this design. It's not as easy to just flush trim if you're off.
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post #11 of 17 Old 11-28-2014, 04:10 PM
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Very nice build!!!
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post #12 of 17 Old 11-28-2014, 08:45 PM
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Very neat and unassuming design and installation. Excellent use of otherwise unused space.
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post #13 of 17 Old 11-28-2014, 10:07 PM - Thread Starter
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Thanks! Just watched expendables 3 which has a ton of explosions. Didn't notice any port noise or excessive ringing.

My wife even mentioned the sub for the first time. She might be a bass head and doesn't know it.

In my case, one well placed sub is out performing two and even three subs. Now I think I need better LCR. Does Erich have a cyber Monday sale?
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post #14 of 17 Old 12-04-2014, 08:40 AM - Thread Starter
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Ran some baseline sweeps. One without audyssey and one with. Audyssey did an awesome job here I think. Better than previous results.

But what is causing the wavy section? It looks like the response from a horn loaded sub, just alot weaker.

There is no smoothing on these. Taken with a CSL umik-1. One shows both with and without audyssey, the other is just with audyssey.



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post #15 of 17 Old 12-04-2014, 08:49 AM
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Quote:
Originally Posted by Samps View Post
Ran some baseline sweeps. One without audyssey and one with. Audyssey did an awesome job here I think. Better than previous results.

But what is causing the wavy section? It looks like the response from a horn loaded sub, just alot weaker.

There is no smoothing on these. Taken with a CSL umik-1. One shows both with and without audyssey, the other is just with audyssey.



Run it again with 1/6th octave smoothing. I've read where some of the experts on here say that 1/6th octave smoothing is closer to what we actually hear anyway.
(From another thread):
Bill Fitzmaurice;29398857]That's not all that bad. Take the measurement again with 1/6 octave smoothing, because that's as much detail as you can hear. Very narrow response notches are extremely difficult, if not impossible to hear. It's response peaks that are easily heard.

The enclosure looks great! Nice work.

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post #16 of 17 Old 12-04-2014, 09:11 AM - Thread Starter
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Thanks!

1/6 and 1/12

1/6th looks awesome. If that is what we're after.



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post #17 of 17 Old 12-04-2014, 09:41 AM - Thread Starter
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I'm also surprised audyssey added 5db of boost at 20hz.
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