Does the Auralex SubDude (or similar) make a difference? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 10 Old 04-18-2019, 01:15 PM - Thread Starter
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Does the Auralex SubDude (or similar) make a difference? Thoughts inside.

edit: I still have REW files saved from pure direct / no EQ in the signal chain, so I'll rerun the tests at some point so the comparison is done without any processing in the chain. The below comparison is with Audyssey and custom EQ enabled (but not changed before/after).

The Auralex SubDude and similar products are basically a foam mattress on a wooden board to decouple the speaker/subwoofer from the floor. Link to an example: https://www.auralex.com/product/subdude-ii/

I have wooden floors throughout the house, and things rattle and shake, and I figured why not - let's try it. It's extremely expensive for what it is - you can DIY this much cheaper.

I took some measurements before and after the installation at various SPL levels. There were no other changes. No EQ change, settings or otherwise.

See for yourself, it does appear to have quite a dramatic improvement at least in my current setup which is WIP. I've attached the REW files for anyone who wishes to take a closer look.

Some intense SPL gains which look odd, but are there.



Distortion dropped quite a bit above 30Hz.



Group delay seemed to improve as well.



The impulse response changed - I'm not sure if better or worse can be interpreted from this data.



Spectrogram without subdude:



Spectrogram with subdude:



And finally, the waterfall graphs. Without subdude:



With subdude:

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Attached Files
File Type: zip -6db.zip (318.9 KB, 3 views)
File Type: zip 0db.zip (318.4 KB, 2 views)
File Type: zip -30dB.zip (319.0 KB, 2 views)
File Type: zip -25dB.zip (318.9 KB, 2 views)
File Type: zip -15dB.zip (319.3 KB, 2 views)
File Type: zip -10db.zip (319.0 KB, 2 views)
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Last edited by Fackamato; 04-18-2019 at 01:21 PM.
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post #2 of 10 Old 04-18-2019, 03:02 PM
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Did you move the sub or mic between tests? Did you open or close any doors or windows between tests?

I'm skeptical of the first spl graph in particular.
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post #3 of 10 Old 04-18-2019, 03:23 PM - Thread Starter
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Quote:
Originally Posted by Samps View Post
Did you move the sub or mic between tests? Did you open or close any doors or windows between tests?

I'm skeptical of the first spl graph in particular.
No, I did not. I agree, skepticism is good - I'll provide non-EQ graphs in a few moments for more data to compare.

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post #4 of 10 Old 04-18-2019, 03:32 PM
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I suspect the differences you're seeing are a result of your sub being ~1.7.5" higher up. The real test would be sub on subdude vs sub on a couple sheets of plywood. That way you've isolated the difference to the material under your sub. I'm not sure what if any smoothing you've applied in those graphs but it doesn't look like particularly aggressive smoothing. Changes like you've demonstrated can be accounted for unexpectedly small changes in mic/sub position, especially if you're running multiple subs.
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post #5 of 10 Old 04-18-2019, 03:58 PM - Thread Starter
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Quote:
Originally Posted by CrusherW9 View Post
I suspect the differences you're seeing are a result of your sub being ~1.7.5" higher up. The real test would be sub on subdude vs sub on a couple sheets of plywood. That way you've isolated the difference to the material under your sub. I'm not sure what if any smoothing you've applied in those graphs but it doesn't look like particularly aggressive smoothing. Changes like you've demonstrated can be accounted for unexpectedly small changes in mic/sub position, especially if you're running multiple subs.
That is definitely a change - the sub is slightly higher up. There is no smoothing applied in any graphs. To be continued...

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post #6 of 10 Old 04-18-2019, 04:32 PM
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Is this sub down firing?
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post #7 of 10 Old 04-18-2019, 05:24 PM - Thread Starter
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Quote:
Originally Posted by Samps View Post
Is this sub down firing?
No. The two subs are front firing. See my post history for the build thread.

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post #8 of 10 Old 04-18-2019, 08:19 PM
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Maybe:

grab some wooden blocks to raise it the same height as the foam?

Tape off the floor to ensure the sub is in the exact same spot?

Thanks for doing some testing!
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post #9 of 10 Old 04-19-2019, 01:21 PM
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I made some subwoofer isolation/ riser platforms using 3/4" MDF and 2.5" diameter rubber bumpers. I was surprised at how much of a difference they made...I live in an old house with hardwood floors that transfer every vibration throughout the whole house and these platforms reduce that so much and also keep the subs from walking around my living room. I was originally planning to get a SubDude or the SVS Soundpath feet but figured I'd try this first and I'm glad I did. Total cost was around $25 each.



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post #10 of 10 Old 04-19-2019, 01:44 PM
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Thanks for doing research. I have an Auralex Subdude that I used for a couple of years with a Sunfire HRS-10 on a wood floor for a 2-channel system. I pulled the Subdude out recently and actually prefer the sound with the sub coupled to the wood floor -- I'm fortunate that I don't get any rattles without it. There was no science and no measurements in my comparison, so I will be watching this thread with interest.

I don't think I will put the Subdude back in the 2-channel system, but I will likely move it to my basement system where I am hoping the subdude will allow me to place a new sub on metal storage rack without inducing rattles.
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