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post #1 of 30 Old 06-22-11, 12:55 PM Thread Starter
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Dead spots

Hi guys,

I am having some major issues with a dead spot and my subwoofer.

My prime sitting position in the middle of the room is compleatly DEAD with space, the seat next to either side is great but the middle is just compleatly dead, it doesnt even sound like i have a subwoofer...

I have tried moving the sub into pretty much every postion with no joy at all, I even tried putting the subwoofer almost right next to me at the side of my chair and it was still dead - move my head to the other chair and the bass was deafning!

Unfortunaly the furniture is quite limited to how i move it due to the way the room is layed out and there isn't many options for re-arranging the room.



Please help???

Craig
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post #2 of 30 Old 06-22-11, 12:59 PM
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Re: Dead spots

Any chance of posting a basic sketch of the room and/or some pics? Sounds like purely a width mode to me.

Bryan

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post #3 of 30 Old 06-22-11, 01:15 PM Thread Starter
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Re: Dead spots

Sure,
Thanks for the help.

I have put the in RED my hifi gear
I have put in black the room plan
I have put in Blue where the bass is ok and where it is dead.

I havent put the subwoofers position because i have tried it EVERYwhere, even in the dinning room!

In this drawing i have been a bit generous with the spaces, the couch is infact right up as far as it c an go to the wall and the gap between the stairs and chair/couch is much much less than shown sorry.

Might be worth mentioning also that i have tried moving my mains around & unplugging them altogether too - Again made no differenc.

When i unplugged the mains the sub just sounded like a very slight 'farting' sound, again move over a seat and it was head crushing bass again :S

Thanks again

Craig



Last edited by CraigRobbo; 06-22-11 at 01:20 PM.
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post #4 of 30 Old 06-22-11, 01:35 PM
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Re: Dead spots

So if you stay in your seating position left to right but move forward, the bass is OK too?

Bryan

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post #5 of 30 Old 06-22-11, 01:38 PM Thread Starter
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Re: Dead spots

Quote:
bpape wrote: View Post
So if you stay in your seating position left to right but move forward, the bass is OK too?

Bryan
Well in the forwards range i have to move right up to the front wall, so a simple 'lean' forward doesnt fix it, however going backwards from my seating position, maybe just 2 foot? but I cannot move back because of the door

I just tried for an experiment putting a sheet on the back wall to soak up some soundwaves but that didn't help, not even a bit.

Thanks in advance

Craig
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post #6 of 30 Old 06-22-11, 01:41 PM
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Re: Dead spots

Sounds to me like the other seats are overdone in bass as they're all boundary loaded to an extent and your seat isn't. I would guess that if you measured it, your seat is probably a more accurate reflection of the amount of bass in the room.

To do anything on the rear wall, it would need to be more like 6-8" to impact bass frequencies.

Have you done any measurements with REW?

Bryan

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post #7 of 30 Old 06-22-11, 01:51 PM Thread Starter
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Re: Dead spots

Quote:
bpape wrote: View Post
Sounds to me like the other seats are overdone in bass as they're all boundary loaded to an extent and your seat isn't. I would guess that if you measured it, your seat is probably a more accurate reflection of the amount of bass in the room.

To do anything on the rear wall, it would need to be more like 6-8" to impact bass frequencies.

Have you done any measurements with REW?

Bryan
Hi.

Thanks again, what you say makes sence but i can assure you its a 'dead' spot -

I have for testing ONLY the sub turned on full volume (hence ear crushing bass in the next to me seats)

Its not just the low bass but mid bass and the general responce of the sound in the prime location is just awful, it like a cheap tinny stereo you get from argos but i would asume what ever is causing hassel with the bass would also fix the rest.

Craig
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post #8 of 30 Old 06-22-11, 05:37 PM
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Re: Dead spots

Well, if every other spot in the room is OK and you're not sitting centered in any of the room dimensions, I'm at somewhat of a loss to explain what the problem is - especially if it's over a broad range of the spectrum.

I would guess it's something that could be helped with treatment - just need to figure out where. Might be best to get/make a couple of broadband bass panels and experiment with placement. Odd shaped rooms and non-symmetric setups do make it a lot more difficult to theoretically determine where problems are coming from. Sometimes it's just the old trial and error method.

Bryan

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post #9 of 30 Old 06-27-11, 05:34 AM
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Re: Dead spots

Are you still running all those 10" subs in your speakers as well as an active sub?
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post #10 of 30 Old 06-27-11, 05:35 AM Thread Starter
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Re: Dead spots

Quote:
Moonfly wrote: View Post
Are you still running all those 10" subs in your speakers as well as an active sub?
Nah

There in a seperate room 2 floors up.

I bought a dedicated 2ch system for music and kept the 9.2 specifically for games & movies.

Craig
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