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Bass not even throughout room

1912 Views 31 Replies 11 Participants Last post by Jonomega, May 21, 2007

acold7dusta

Discussion Starter · May 16, 2007

last december i bought a Ascendant Audio Assassin (12") and stuck it in a 2.6 cu ft enclosure (tuned to 30 hz). the amp is a dayton 240w plate (gain about 1/2, x/o about 65 hz). the problem im having is whereever in my bedroom i stick it, the bass is only on the walls (i also tried flipping the phase too).

the only time the bass is projected throughout my whole room is in my closet, but its a bit too slow for my tastes. (it was quite monstrous at 1/4 gain too).

im planning on building a different box, but do you think this will solve my problem?

i will provide pics when i get home, thanks

1 - 20 of 32 Posts

blaser

· #2 · May 16, 2007

NO! This is a room problem and not a subwoofer problem. Try changing sub location/seating location....measure FR and let us see what happens

acold7dusta

Discussion Starter · #3 · May 16, 2007

thanks, ill keep on switching up locations

whats the easiest way to measure FR throughout a room?

John F. Palacio

· #4 · May 16, 2007

Welcome to standing waves. Your room/sub location is the issue here.

Ethan Winer

· #5 · May 16, 2007

Quote:
Originally Posted by acold7dusta /forum/post/0

whereever in my bedroom i stick it, the bass is only on the walls

Others suggested trying different places, and that's valid. But no matter where you put it there will always be many peaks and deep nulls. The only true solution is bass traps. See my Acoustics FAQ:

http://www.ethanwiner.com/acoustics.html

Then follow up here with any questions.

--Ethan

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acold7dusta

Discussion Starter · #6 · May 16, 2007

would this be a possible cause? right now its in the corner of my room front firing along my one wall (about 4" away from each wall) and is under my long desk.

would downfiring help standing waves at all?

acold7dusta

Discussion Starter · #7 · May 16, 2007

Quote:
Originally Posted by Ethan Winer /forum/post/0

Others suggested trying different places, and that's valid. But no matter where you put it there will always be many peaks and deep nulls. The only true solution is bass traps. See my Acoustics FAQ:

Then follow up here with any questions.

--Ethan

thanks, ill read the whole thing when i get home

blaser

· #8 · May 16, 2007

Ethan Winer said:
Others suggested trying different places, and that's valid. But no matter where you put it there will always be many peaks and deep nulls. The only true solution is bass traps. See my Acoustics FAQ:

http://www.ethanwiner.com/acoustics.html

Then follow up here with any questions.

--Ethan[/QUOTE

I think only equalization can treat room anomalies below 100 Hz from a practical point of view...what do you think?

blaser

· #9 · May 16, 2007

Quote:
Originally Posted by Ethan Winer /forum/post/0

Others suggested trying different places, and that's valid. But no matter where you put it there will always be many peaks and deep nulls. The only true solution is bass traps. See my Acoustics FAQ:

http://www.ethanwiner.com/acoustics.html

Then follow up here with any questions.

--Ethan

I think only equalization can treat room anomalies below 100 Hz from a practical point of view...what do you think?

acold7dusta

Discussion Starter · #10 · May 16, 2007

update: i rotated my sub 90 degrees, put it back into phase and turned up the gain a bit. result: more even bass throughout the room, but the edges are still boosted. thats normal, right?

heres an awkward view of how my setup was, and the sub is now facing forward into my bed

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deneb

· #11 · May 16, 2007

You will almost always have stronger bass near walls than towards the middle of the room. Bass traps can do a lot to reduce peaks and increase nulls throughout the room, while EQ will only even out the response at the listening position (or wherever you put the microphone), and will do nothing to tame decay time issues.

So yes, it's normal to have stronger bass near walls.

blaser

· #12 · May 17, 2007

Quote:
Originally Posted by deneb /forum/post/0

Bass traps can do a lot to reduce peaks and increase nulls throughout the room, while EQ will only even out the response at the listening position (or wherever you put the microphone), and will do nothing to tame decay time issues.

Of course you are not talking about deep bass, are you

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Ethan Winer

· #13 · May 17, 2007

Quote:
Originally Posted by blaser /forum/post/0

I think only equalization can treat room anomalies below 100 Hz from a practical point of view...what do you think?

That's not true. Good bass traps can be effective down to 50 or even 40 Hz if you have enough of them. Below that a small amount of EQ is useful.

--Ethan

blaser

· #14 · May 17, 2007

Quote:
Originally Posted by Ethan Winer /forum/post/0

That's not true. Good bass traps can be effective down to 50 or even 40 Hz if you have enough of them. Below that a small amount of EQ is useful.

--Ethan

Of course, maybe even to 20 Hz, but what will be the thinkness ? Normally the deeper the bass, the more thickness you need, and I think below 80-100, it is becoming unpractical or at least unfeasible to trap bass. Correct me if I'm wrong.

Ethan Winer

· #15 · May 18, 2007

Quote:
the deeper the bass, the more thickness you need, and I think below 80-100, it is becoming unpractical or at least unfeasible to trap bass.

Yes, thickness is necessary to get to lower frequencies. You also need more total surface coverage. But you can definitely make a real improvement down to maybe 40 Hz using a practical number of "normal" size traps - say, 4 inches thick. The graph below shows the response and ringing in my living room. As you can see, the only peak that's not fully controlled is the one below 30 Hz. I do have a lot of bass traps! But most are only three inches thick.

--Ethan

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OvalNut

· #16 · May 18, 2007

And to piggyback on Ethan's comments, below you will see the before and after results of using corner bass traps and 4" acoustical panels to trap bass and even out response in my room.

These before/after results demonstrate that there are real results down to a little below 40 hz.

BEFORE - Low Frequency Waterfall of Decay Times:

[URL='http:/attach//816847-3beforelowfreqwaterfall.JPG%5B/IMG']http://www.***************.com/attach//816847-3beforelowfreqwaterfall.JPG[/IMG[/URL] ]

AFTER - Low Frequency Waterfall of Decay Times:

[IMG] [URL='http:/attach//816848-4afterlowfreqwaterfall.JPG%5B/IMG']http://www.***************.com/attach//816848-4afterlowfreqwaterfall.JPG[/IMG[/URL] ]

Definitely treat your room first, before applying EQ.

Tim

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blaser

· #17 · May 19, 2007

Well, I see some improvements, but see how this is effective at 120-140 Hz.... But below 80, I believe an equalizer will be the most efficient.

OvalNut

· #18 · May 19, 2007

No doubt the 120-140 range was drastically improved. Note also though the significant reduction of ringing down to about 40hz. That huge standing wave centered around 42hz is nearly all but gone, though the big one right below it around 38hz is still there.

The clarity that these treatments alone brought to my room cannot be understated.

Your mileage may certainly vary.

Tim

Sirquack

· #19 · May 19, 2007

blaser,

I think you need to do a little more research and realize who it is your disagreeing with.

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blaser

· #20 · May 20, 2007

3

Quote:
Originally Posted by Sirquack /forum/post/0

blaser,

I think you need to do a little more research and realize who it is your disagreeing with.

Do you mean that I am "too small" to disagree

I think you need to do a little more research to realize why at a certain point, equalization will be easier, more practical and cost effective than bass traps

Well, I have to admit that point is obviously not 80-100 Hz according to the experts here....maybe below 40-50 Hz, but also not everybody can accept to sacrifice 4" from each wall (Is it only 4" when someone's having a strong room mode at 35 Hz like me? is it all the wall? I do not know....) or so

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1 - 20 of 32 Posts

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