Ported SubRiser question - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 15 Old 03-24-2017, 01:37 PM - Thread Starter
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Ported SubRiser build thread

I am wondering if this oddly shaped box would still perform properly. 2 of these would be the riser for the second row.

edit: better pic
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Last edited by K9woofer; 07-21-2017 at 04:48 PM.
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post #2 of 15 Old 03-24-2017, 05:58 PM
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Should work just fine. You'll need to adjust the port length to account for it being along the sides. It will need to be shorter than winisd calculates. Usually half the height of the port subtracted from the length.

Considering the odd shape and semi long length of the cab, there may be a standing wave issue, but I'm not qualified to figure that out. Probably easily fixed with a pillow in the right spot.
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post #3 of 15 Old 03-26-2017, 12:05 PM
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Your end to end resonance (along the long dimension) will be around 110 Hz. Could be a problem, but as Samps posted, a few cheap pillows should help
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post #4 of 15 Old 03-26-2017, 08:38 PM - Thread Starter
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Quote:
Originally Posted by Augerhandle View Post
Your end to end resonance (along the long dimension) will be around 110 Hz. Could be a problem, but as Samps posted, a few cheap pillows should help
.
Thanks for the responses.

This thing will probably get a lowpass filter to avoid localization, unless the phase gets too far out. Front subs in addition to this.
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post #5 of 15 Old 06-29-2017, 06:57 PM - Thread Starter
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Started assembly.
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post #6 of 15 Old 06-30-2017, 01:49 AM
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What driver are you planning to use? How many cubes for each driver?
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post #7 of 15 Old 06-30-2017, 01:46 PM
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Interesting project. The box isn't as long and skinny as the drawing made it look. That should work just fine. I wonder if it might actually work better without a lot of bracing? Obviously it needs to be strong enough to support weight on top of it, but a little bounce may or may not enhance the feel.
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post #8 of 15 Old 06-30-2017, 08:58 PM - Thread Starter
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Quote:
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What driver are you planning to use? How many cubes for each driver?
UM-18, 14.5 cu ft each.
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post #9 of 15 Old 07-07-2017, 07:32 PM - Thread Starter
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Longest internal dimension is 58.5". Will it need a pillow inside?
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post #10 of 15 Old 07-07-2017, 07:47 PM
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Quote:
Originally Posted by K9woofer View Post
Longest internal dimension is 58.5". Will it need a pillow inside?
Yes, some form of absorption will be needed. Placed away from the wall, it becomes more effective.
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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 #11 of 15 Old 07-12-2017, 07:09 PM - Thread Starter
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Got one almost done.
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post #12 of 15 Old 07-18-2017, 04:34 PM - Thread Starter
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I played some sweeps with and without a pillow. I can hear the dip and peak around 100hz quite obviously without a pillow. With a pillow it is minor.

Excursion minimum came in around 15hz. Was trying for a 16hz tune.
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post #13 of 15 Old 07-20-2017, 09:35 AM
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Quote:
Originally Posted by K9woofer View Post
I played some sweeps with and without a pillow. I can hear the dip and peak around 100hz quite obviously without a pillow. With a pillow it is minor.

Excursion minimum came in around 15hz. Was trying for a 16hz tune.
Nice! Looking forward to seeing these completed! You and @Scott Simonian have inspired me to do something similar. I plan on keeping the entire riser ~14 inches high and up firing the drivers underneath the back row seating. Are you going to be facing the drivers at a wall or the first row of seating?
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post #14 of 15 Old 07-21-2017, 05:01 PM - Thread Starter
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Are you going to be facing the drivers at a wall or the first row of seating?
Drivers will be facing the first row.

I played around with SketchUp a bit. Updated the first post.
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post #15 of 15 Old 07-24-2017, 05:50 PM
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Nice, I am also planning something like this !!!!!!

Link to Stereo Integrity SI HT 18 sub build......https://www.avsforum.com/forum/155-di...-pedestal.html
Speakers and subs for sale...https://www.avsforum.com/forum/209-au...kers-subs.html
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