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how to eliminate boomy bass...

Discuss how to eliminate boomy bass... at the Speakers within the HiFiVision.com - Audio Video Hi-Fi Forum; Originally Posted by jls001 Is your speaker rear firing port type? If yes, then 9 ...

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  #21  
Old 29th August 2011, 11:40 AM
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Re: how to eliminate boomy bass...


Quote:
Originally Posted by jls001 View Post
Is your speaker rear firing port type? If yes, then 9 inch is way too less. Increasing that 2 feet should produce wonders. Please experiment. Even for non-rear firing, it's still good to keep sufficient space behind (and to the sides of the speakers).
Joshua
yup rear port type...i'll try today n will post later ,see if it helps but 2 feet is very inward lemme try a reasonable distance n from sides both atleast 2 feet
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  #22  
Old 29th August 2011, 11:42 AM
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Re: how to eliminate boomy bass...

Quote:
Originally Posted by deba View Post
easiest way is to introduce a dual channel graphic equaliser and reduce the bass curve on the channel producing boomy sound.....or else go for proper acousic treatment or relocation of your speaker system.....8-))
i like to do proper acoustic treatment but afraid from the cost ..don't know how much it'll cost ...
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  #23  
Old 29th August 2011, 11:54 AM
 
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Re: how to eliminate boomy bass...

Manu
Speaker placement is the only effective way to get rid of bass boominess if you dont want to go for equalization.
For me the Cardas method worked the best Cardas Audio
Cheers
Himadri
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  #24  
Old 29th August 2011, 12:09 PM
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Re: how to eliminate boomy bass...

If you have a subwoofer and crossed it at 80 Hz or even may be 100 Hz can help. Especially if the right side of room is causing the issue. You can move the Hsu sub to some other location where it does not sound boomy. This way, you are moving the sound to a place where it won't have reflection or min room effect.

I don't think the spikes will help, unless the speaker is not exactly flat to floor and causing vibrations. Also, I think spikes work best with carpet floor to give better speaker grip. I haven't used spikes so can't comment for sure.

For bass traps, it can come cheaper if you are looking into DIY. Although you will need very thick, 6"+ to absorb the low frequencies. There are tons of info on diy bass traps.
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  #25  
Old 29th August 2011, 12:11 PM
 
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Re: how to eliminate boomy bass...

If you are using an AVR, try doing bass settings.
It helps a lot without compromising the bass and mid range. Set the speakers to small (very important) and change the crossover to 80 hz. Trust it helps a lot.
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  #26  
Old 29th August 2011, 12:19 PM
 
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Re: how to eliminate boomy bass...

There are many suggestions being given. But I fail to understand how can this be, without knowing...
1. Room Dimensions! Also what is the room made of (cement walls I presume, and flooring)?
2. I notice you have gone the separates way. Does it have room correction - Audessey? Audessey does a nice job correcting room bass, again it is only so much that it can do.

The room would be the biggest problem. Eventually to give advice on how to rectify this is impossible without measurements, measurements, measurements and measurements!!! You could have slight improvements trying a couple of different stuff & maybe get luck too... but, unlikely.

I noticed you have a really good HiEnd HSU sub (The sub suggests that you have a pretty big room). Is the sub playing when you have boomy bass? This is one of the biggest problems with FS. Placement becomes crucial, more so if room has acoustics problems in the bass regions (significant in small-medium sized rooms). If you had a sub or if you can crossover early and *not play bass through the FS* then good placement of the sub can rectify bass to some extent. Placing a sub to obtain good bass is not hard, but placing an FS to get good bass....thats a different challenge entirely.

post #23 is a good place start! That wont solve it entirely because it is most likely a room problem....which I am sorry to say wont go away easily. Room treatment in the form of bass traps is the solution. Again unless we have some real measurements to know what is the problem, difficult to fix it.
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  #27  
Old 29th August 2011, 12:32 PM
 
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Re: how to eliminate boomy bass...

Manu, I hate to say this but this a perpetual problem with all rear-ported speakers in small rooms with not enough space for the bass waves to propagate and subsequently dissipate. However, sometimes port woof aka noise is the main culprit at times. Ports are a way for the manufacturer to tune, augment and optimize the response with the same hardware. Yes spikes will help to an extent in improving the bass response but in no way will they mitigate the effect of standing waves emanating from the rear ports. LIke ajay said, sealing the bass port kills the very character of the speaker which the manufacture strived to get the best of with the same hardware and hence the same budget, so it never works as it virtually amounts to re-inventing the wheel. Bass traps do work but they too take a lot of space and are neither easy nor cheap to build. let me know if you are interested.
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Old 29th August 2011, 12:42 PM
 
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Re: how to eliminate boomy bass...

Quote:
Manu, I hate to say this but this a perpetual problem with all rear-ported speakers in small rooms with not enough space for the bass waves to propagate and subsequently dissipate.
Correct me if I am mistaken, but Isnt the polk rti a5 front firing?
Usually backfiring have an even more significant issues with distance to back wall.

Quote:
Originally Posted by darshanjoshi View Post
If you are using an AVR, try doing bass settings.
It helps a lot without compromising the bass and mid range. Set the speakers to small (very important) and change the crossover to 80 hz. Trust it helps a lot.
sorry, but setting speakers to small usually in most receivers and amps, it internally overrides the crossover. When set to small it defaults to around 80, and tweaking it is no use in most receivers. If you want to set crossover then set it to large!!!

Quote:
If you have a subwoofer and crossed it at 80 Hz or even may be 100 Hz can help.
Yes. But only to some extent. It is easier to get good tight bass from good sub placement than through an FS. One of the not so well discussed horrors of getting an FS. Placement of FS in some rooms becomes extremely crucial, especially for bass.

Quote:
Especially if the right side of room is causing the issue.
It is not just a problem of right or left. It is the whole room.

Quote:
I don't think the spikes will help, unless the speaker is not exactly flat to floor and causing vibrations. Also, I think spikes work best with carpet floor to give better speaker grip. I haven't used spikes so can't comment for sure.
A nice thick plank of wood under the sub & FS would help to some extent. MDF is great, with supports under the board.
If you can get this, then it wud be great. But nuthing great about it that DIY cannt achieve.

Quote:
For bass traps, it can come cheaper if you are looking into DIY. Although you will need very thick, 6"+ to absorb the low frequencies. There are tons of info on diy bass traps.
Thick rigid fibreglass, 2 panels of 6" each or one 12" panel would do great. But you would require to do this on every damn corner, and sides. Again, without measurements dont expriment with your money

One which could help a lot if you room is not too big, try these in order.
1. Bring the speakers front. Experiment, 2 - 6 ft from back wall. Even moving 6 inches in any direction can make big difference. Watch the side walls, the ratio of distance from side walls to back walls is crucial. (But dont be rigid with anything. Experiment, experiment & experiment)
2. Crossover bass away from the main speakers to the sub, experiment with different crossover frequencies. Do not play all the bass from the FS. This is mainly because it is easier to place a sub. So before you do that, you need to place the sub right!!
3. Treat the wall behind you. This can help a lot, more so in a smaller room.
4. Bass traps.
(Before you do 3 & 4 you need measurements to understand what is the problem area before you spend your hard earned money)


Trying to find a link which I bumped across recently, it can help a lot. Will post it If i do find it.
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  #29  
Old 29th August 2011, 05:38 PM
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Re: how to eliminate boomy bass...

thanks all of u to post ....i have tried spikes but no effect still boomy from right side of the room(even swapping fs each other )
guys my hsu uls-15 won't create any bomminess or echo its just fs the thing is when i play music i turn off the sub n in av processor to none n fs to full otherwise all are at 80hz n small ,only when playing fs to full create boominess sub is great no problem in that department
so today i contact an acoustician from chandigarh but it cost me one lacs.....dammm.he talked about acoustic tiles n not in my range ...
i guess i have to sold polk rtia5 n get bookshelves ....
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  #30  
Old 29th August 2011, 06:03 PM
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Re: how to eliminate boomy bass...

Sorry to Bump up this thread, i have a query in this line

I have the same FS speakers and SVS PB12 Plus subwoofer. I don't have boomy sound issue from the FS standers (Crossover at 60Hz). Room size is 32x12x10(LxWxH). But there is a boominess for low frequency sound from Subwoofer.

I found the following info from another post in this forum. Which mentions about the thickness of sound trap to be installed in the backside of the room.

------------
343 ÷ 100 = 3.43 ÷ 4 = 0.86 meter
343 ÷ 90 = 3.81 ÷ 4 = 0.95 meter
343 ÷ 80 = 4.29 ÷ 4 = 1.07 meter
343 ÷ 70 = 4.90 ÷ 4 = 1.23 meter
343 ÷ 60 = 5.72 ÷ 4 = 1.43 meter
343 ÷ 50 = 6.86 ÷ 4 = 1.72 meter
343 ÷ 40 = 8.58 ÷ 4 = 2.14 meter

So if you want to trap all the frequencies from 100Hz & above, the trap depth has to be more than 0.86 meter. If you want to trap all the frequencies above 60Hz, the trap depth has to be more than 1.43 meter ..... and so on. Its advisable to have a rear wall trap of 1.1 meter so that all the directional frequencies above 80Hz are totally kept under control.
---------------

My question is if I install a bass trap of 1.1 meter depth to absorb all frequencies above 80Hz, will there be any effect on a sound signal of 60Hz or 40Hz. Will the boominess due to them will be reduced or there will not be any change. In case the boominess will reduce, how much it will reduce approximately - like 50% or 20%


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