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subwoofer position
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Old 8th October 2017, 07:15 PM   #1
umut1001 is offline umut1001  Europe
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Default subwoofer position

Hi.I have built a subwoofer with SB Acoustics SB34NRX75-6 12" Woofer.I have made downfiring sealed box of 100 liters with some polyester stuffing
Made a 2. order PLLXO and using axial polystyerene caps.
2.1 system with stereo 4 inch fullranges and one subwoofer.
The sound is very very good.I am very happy with the sound.
Subwoofer is on the left corner and sofa is on the back of the room.
But when i sit on the sofa the bass diseppears(at position of the baby on the sofa).When i stand up bass level increases.When i walk to the middle of the carpet,when getting near the subwoofer or tv, bass sound increases a lot.It becomes Very good bass.But at sitting position there is almost no bass
It seems i can not change the subwoofer position because of "waf".So what can i do ?
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Old 8th October 2017, 08:33 PM   #2
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by umut1001 View Post
It seems i can not change the subwoofer position because of "waf".So what can i do ?
Mmm, bit of a problem, it's a null caused by a room mode, it's a case of changing speaker position, your position or both. Moving yourself away from the wall would be a start
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Old 8th October 2017, 08:34 PM   #3
bentoronto is offline bentoronto  Canada
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subwoofer position
First step is always the same: measure with REW and your laptop mic so you can actually tell (and are able to tell us) what you are hearing.

Shouldn't DIYaudio start a rule about prohibiting postings based on loose impressions like this asking for members' help?

B.
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Old 8th October 2017, 08:35 PM   #4
HumbleDeer is offline HumbleDeer  Belgium
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Would the Wife approve to WAF a subwoofer at the back? Try positioning it there. If it gud there, fight it out with y'wife.
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Old 8th October 2017, 08:49 PM   #5
umut1001 is offline umut1001  Europe
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Hi again.I am sitting in the middle of sofa because it is the middle of fullrange speakers.(stereo image)
When i sit near the curtain(corner of the sofa,opposite the subwoofer),bass increases.But i do not want to sit there because right speaker becomes far away from me.
Yes wife allows sub in the corner.No other place sorry.
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Old 8th October 2017, 08:51 PM   #6
HumbleDeer is offline HumbleDeer  Belgium
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Since the bass is fine on the front along the line of the subwoofer, you can bring that line to you by moving the subwoofer to the back corner, opposite side of the left wall.
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Old 8th October 2017, 09:06 PM   #7
umut1001 is offline umut1001  Europe
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Yes i also think it will sound better but sorry the back of the room is not allowed for subwoofer placement(there is tent of my daughter ,and there is a cupboard in the other corner.(unnecessary cupboard and i am tired of fighting with wife)
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File Type: jpg 2017-10-08 23.59.37.jpg (737.4 KB, 190 views)
File Type: jpg 2017-10-09 00.01.46.jpg (710.7 KB, 181 views)
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Last edited by umut1001; 8th October 2017 at 09:10 PM.
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Old 8th October 2017, 09:33 PM   #8
bentoronto is offline bentoronto  Canada
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subwoofer position
Unhelpful to talk about such a thing as "bass" - a useless generalization in this context.

In a room like OP - and this is very obvious from the tiny amount of information we have about his problem - the freq response looks like a mountain range anywhere you measure it and different everywhere you measure it.

Is his problem at the crossover region, at the very bottom (who knows where that is?), or the the well-used middle at that most recordings emphasize like 70 Hz? Or all? Or does it change? Or what?

B.
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Old 8th October 2017, 09:40 PM   #9
umut1001 is offline umut1001  Europe
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Hi.Oh sorry for low info.I will make some real RAW tests and tell results.
The subwoofer crossover frequency is around 120Hz and for example the drum sounds in usual hip hop ,pop or rock are at very low level at sitting position.
(for example floor tom 65hz missing and many others)
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Last edited by umut1001; 8th October 2017 at 09:42 PM.
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Old 7th November 2017, 10:39 AM   #10
umut1001 is offline umut1001  Europe
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Hi.Here is the measurement.I am not sure i did it right.Sorry I have very low information about measurement.(no calibration )
Is it very bad?
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File Type: png measurement1.png (94.3 KB, 134 views)
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