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Two subs placement to get +6 dB gain in a square room.

geek101

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REW simulation for my 24x24x8ft room with MLP shows front left corner is optimal for sub placement.

I moved MLP and speakers so that I am shifted to front and left from the center of the room (to avoid nulls for square room).

I am aiming to reach certain SPL thresholds given the CTA rating and long term SPL measurements provided.

It seems like co-locating two identical subs give me max gain. I am interested in range to upto 80hz or more (optional).

I can put them side by side on the front left corner.

They will be connected by two independent subwoofer outputs from AVR with Dirac calibration. Is it better I use single output and daisy chain them?. I prefer not to use additional gear like Minidsp.

Subwoofers being considered are: HSU VTF-TN1 x2 / Rythmik FV18 x2. Mentioned them for size consideration and why I do not wish to stack them.
 
REW simulation for my 24x24x8ft room with MLP shows front left corner is optimal for sub placement.

I moved MLP and speakers so that I am shifted to front and left from the center of the room (to avoid nulls for square room).

I am aiming to reach certain SPL thresholds given the CTA rating and long term SPL measurements provided.

It seems like co-locating two identical subs give me max gain. I am interested in range to upto 80hz or more (optional).

I can put them side by side on the front left corner.

They will be connected by two independent subwoofer outputs from AVR with Dirac calibration. Is it better I use single output and daisy chain them?. I prefer not to use additional gear like Minidsp.

Subwoofers being considered are: HSU VTF-TN1 x2 / Rythmik FV18 x2. Mentioned them for size consideration and why I do not wish to stack them.
Simulations are a good starting point (& sometimes the end point) BUT empirical experimentation sometimes wins (and may be different than the simulation).
 
Of course stacking two subs in a corner will give maximum gain, but so will buying a much larger sub that costs as much as two smaller ones. The benefit of two subs is not just more power, but also a smoother response, provided that they are in different locations. The latest version of Multi Sub Optimizer allows you to prioritize spl when equalizing two subs in different locations. But remember: there is no free lunch.
 
Of course stacking two subs in a corner will give maximum gain, but so will buying a much larger sub that costs as much as two smaller ones. The benefit of two subs is not just more power, but also a smoother response, provided that they are in different locations. The latest version of Multi Sub Optimizer allows you to prioritize spl when equalizing two subs in different locations. But remember: there is no free lunch.
I understand this but looking at current pricing math nothing is equal to the cost of two HSU VTF-TN1s with two ports open and giving +6 dB(if it is possible) through out the freq range , including shipping and tax.

I cannot stack these two up. In fact any subs that can match or beat it.

I may have to go all the way to JTR cap 2400 or 2400ulf . Even then I am looking at 3x / 4x VTF-TN1s.
 
REW simulation for my 24x24x8ft room with MLP shows front left corner is optimal for sub placement.

I moved MLP and speakers so that I am shifted to front and left from the center of the room (to avoid nulls for square room).

I am aiming to reach certain SPL thresholds given the CTA rating and long term SPL measurements provided.

It seems like co-locating two identical subs give me max gain. I am interested in range to upto 80hz or more (optional).

I can put them side by side on the front left corner.

They will be connected by two independent subwoofer outputs from AVR with Dirac calibration. Is it better I use single output and daisy chain them?. I prefer not to use additional gear like Minidsp.

Subwoofers being considered are: HSU VTF-TN1 x2 / Rythmik FV18 x2. Mentioned them for size consideration and why I do not wish to stack them.

Also try to simulate with REW what happens if you put one of the subs on the front wall and the other on the back wall with inverted phase
That might give you a more even frequency response vs. stacking them in one place

And then start playing around with placement and measure measure measure :)
 
Putting them in the corner will certainly give you the greatest boost in SPL, but at the cost of uneven frequency response. Putting them at mid points on opposite walls will give you the evenest FR, at the expense of output level. Personally, I would choose even FR over maximum SPL any day. That said, 4 subs in all the corners with DSP will give you the best of all worlds.

 
Got 2 of them to start with . REW still thinks corners are best. Will post real measurements
 
And look into Multi Sub Optimizer. The latest version has an option to maximize spl, if that is what you need. Personally and for me, the smoothest response is more important than spl.
 
And look into Multi Sub Optimizer. The latest version has an option to maximize spl, if that is what you need. Personally and for me, the smoothest response is more important than spl.
Thank you will give this a try.
 
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