How far should my sub be from the wall?

[cameron paterson]

I have one of these subs among others.

Devastator MkII 21-inch Ported Horn Home Theater Finished Subs (Powered and Passive models, 19Hz tuning) FREE SHIPPING!!!

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I need help with it. Its nearfield (about 6 feet from my couch.) On the left side of this sub its 8 inches away from the wall. The other side is 8 inches from an 18" sub. I like to point my subs towards the wall. How far away should the front of my sub be away from the wall? 1 foot? 2 feet? 3 feet? I like the bass bouncing off the wall! I see other guys putting their subs up front pointed forward in their theater rooms. Doesn't that sacrifice a lot of bass compared to pointing at the wall? What do you think the benefits are to pointed at a wall and pointed forward? Also should I have the port of the Devastator on top or on bottom?

 

[lovinthehd]

Use a measurement mic and appropriate software and find out for your particular room/gear....

 

[cameron paterson]

I tried a mic and REW a long time ago but couldn't figure it out and gave up. What would the benefits be from 1 foot away to say 3 feet away?

 

[lovinthehd]

I tried a mic and REW a long time ago but couldn't figure it out and gave up. What would the benefits be from 1 foot away to say 3 feet away?

Hard to know particularly. Boundary reinforcement is what it is, there are various calculators you can use aside from actual measurements based on your specific room dimensions....but nothing anyone can particularly analyze without a lot more info from you. Generally twice the port diameter is judged to be fine as far as a distance from a boundary for vented subs....

 

[cameron paterson]

So wait. The port in the Devastator is huge should it be like 3 feet away then? My other sub pointed at the wall has a 16" x 3" port so how far on that as well?

 

[everettT]

So wait. The port in the Devastator is huge should it be like 3 feet away then? My other sub pointed at the wall has a 16" x 3" port so how far on that as well?

As Lovin stated, there is no rule for placement, you either use the wall to boost bass (boundary reinforcement) or you don't. Using REW and the placement simulation isn't difficult and since every room is different, so is the best sub placement. Also that horn will play so loud you might not know if you're sitting in a null, lol.

Room Simulator

 

[lovinthehd]

So wait. The port in the Devastator is huge should it be like 3 feet away then? My other sub pointed at the wall has a 16" x 3" port so how far on that as well?

Couldn't tell you about the Devastator, did you ask GSG?

 

[cameron paterson]

I pointed the Dev right at my head and it sounds phenomenal. It doesn't need to bounce off the wall because its bouncing off the walls of the enclosure.

 

[HuenEye]

I tried a mic and REW a long time ago but couldn't figure it out and gave up. What would the benefits be from 1 foot away to say 3 feet away?

REW is horrible for measuring bass response - I use a Velodyne SMS which gives far more accurate information than REW. John Atkinson said as much too.

Just put them in the corners and use room placement to increase or decrease bass response until you like the sound..

 

[William Lemmerhirt]

REW is horrible for measuring bass response [/b QUOTE]

Would you be interested in elaborating?

 

[HuenEye]

Yes. REW doesn't measure what my ears tell me I'm hearing. Period. I have some pricey calibrated mics and when used with REW they give the same wrong result. My ears don't lie and neither do the vibrations I feel