What should I expect - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 8 Old 01-11-2018, 10:14 AM - Thread Starter
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What should I expect

Where to begin... Well my room has been "finished" for a while now, and is great! Which means I want to upgrade constantly. I am currently using 4 Infinity 12's in ported (iClops) boxes powered by a iNuke 3000DSP. The link to the build and info for all of that is in my signature.

A few months ago, a buddy of mine won a 21" sub from @eng-399 's G2G. We then spent a couple weekends building a bad ass ported box for it, that was quickly axed when it made its way into the house. You can see that whole build here
https://www.avsforum.com/forum/155-di...rted-21-a.html

He was sitting on it for a while trying to decide what to do, and ultimately decided to get rid of it and do something with a higher WAF. When that happened he gave me first dibs which I laughed off at first. But being a member here, that just smoldered in the back of my brain the last couple weeks. Could I do a 21? Would it fit? How would it sound?

Last night I had a brilliant idea for a box that would work for my space and for that driver! Today he dropped my price even lower, and now I don't think I can pass on this thing! I am not going to get into the box details yet, but it will be almost identical volume and the same ports. Here is a model I did last weekend with the 21" in grey and my current Infinity subs in red (apologies in advance for the pic of a screen)



If there is some way to keep similar specs for my Infinity subs with all 4 moved to the back of the room, and the 21 up front, what should I expect?

What about those infinity subs, keep them? Build them into sealed boxes (or 1 box, or 2 boxes), build a new ported box(s) for them to keep the same output they have now? In a perfect world I would want the subs in the back of the room to be narrower if possible. They can take up the whole back wall, and be pretty much any height though.


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post #2 of 8 Old 01-11-2018, 11:19 AM
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Quote:
Originally Posted by Broke EF View Post
some way to keep similar specs for my Infinity subs with all 4 moved to the back of the room
We don't know, we haven't been in your house (that you know of... )


Dimensions and room pics might help.

There can be phase issues with mixing different drivers and/or box types, it may or may not be a problem.

Is there room to put all 4 Infinities in a single horn box? Might as well go all-out SPL-assault. (Because: Never enough bass! )
Any height, any length. Sounds perfect for a horn to me!
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post #3 of 8 Old 01-11-2018, 11:37 AM - Thread Starter
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Room dimensions and LOTS of room pics are in the link in my signature

TLNR
Room is ~20' long, 11' wide, and 8' tall

Old crappy pic of the room


I took new pics recently, but I don't think I ever took them off my camera. I will work on that when I get home.

I have 0 experience with horn subs, so I really cant say if there is room for it or not. I am guessing no, but I said the same thing about the 21
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post #4 of 8 Old 01-11-2018, 12:47 PM
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That is a great looking room. I really like the layout!
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post #5 of 8 Old 01-11-2018, 03:19 PM - Thread Starter
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OK, I measured for a potential box in the back of the room. Absolute MAX dimensions would be 91" Wide, 41.5" Tall, and 16" Deep. If I wanted to keep the same box volume I currently have, and make the box a bit more shallow, it would be about 90" Wide, 24.5" Tall, and 12" Deep. I am not sure how it works to get the same porting I have now though. I guess I can run it though WINISD and see what I get since I know the current boxes are tuned to 19Hz.

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post #6 of 8 Old 01-12-2018, 10:00 AM - Thread Starter
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Its mighty quiet in here. Is that what I should expect from a ported 21 up front and 4 ported 12's in the back, total cancellation?!

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post #7 of 8 Old 01-12-2018, 05:53 PM
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It's almost impossible to say without PhD-level software and a PhD in acoustics, and spending hours 3D-modelling it and crunching numbers.

Most box modelling software only does hemi-anechoic @ 1m,
it doesn't take into consideration room nulls or phase issues with multiple boxes firing with different drivers and tunings and placements.

You won't know how well it works until you build it and fire it up.
All we can say is it "should" work; but we don't know 100% for sure...

The good news is that once the wave length no longer fits in the room, it is nearly impossible to have phase cancellation;
but above that frequency, who knows...
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post #8 of 8 Old 01-12-2018, 06:38 PM
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Put the 21 firing into your couch.
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