[CraigRobbo]

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

 

[bpape]

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

Bryan

 

[CraigRobbo]

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

 

[bpape]

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

Bryan

 

[CraigRobbo]

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

 

[bpape]

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

 

[CraigRobbo]

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

 

[bpape]

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

 

[Moonfly]

Are you still running all those 10" subs in your speakers as well as an active sub?

 

[CraigRobbo]

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

 

[Moonfly]

Right ok, so what exactly are you running in here now, you mention a sub, do you have an active sub in a 2.0 system?

 

[CraigRobbo]

Right ok, so what exactly are you running in here now, you mention a sub, do you have an active sub in a 2.0 system?

I am running an Arcam amp & MS 902i Speakers and an Eltax active subwoofer.

I know its not the best but it sounds alright - Except in the prime listening position.

Craig

 

[Moonfly]

Subwoofer model number?

What experimentation have you done with subwoofer placement, cant see it in your image?

 

[CraigRobbo]

Subwoofer model number?

Its the eltax atomic 6.2a - I know its not big but remember that in my new house i listen at low levels and the sub is never over worked...
In every spot other than center it sounds really nice...But even the bass from the main speakers(if the sub is disconected) still sounds lacking and dull(not just low volume but like its sounds hollow so to speak)

Craig

 

[Moonfly]

Have you double checked the speakers are in phase etc. Is there no position in the room you have tried the sub where it sounds good in both sitting positions, or if not at least good in the other spot.

 

[CraigRobbo]

Have you double checked the speakers are in phase etc. Is there no position in the room you have tried the sub where it sounds good in both sitting positions.

Yeah tried the phase thing thats what i thought at first - I even tried taking the mains out altogether and still no joy.

The sub i have tried in every possible position and location you can think of - Even in the dinning room!

Do you fancy popping down and having a look maybe Dan?

Craig

 

[Moonfly]

I might be able to make time, but before that, is there any position in the room you have put the sub that has sounded good in the current dead spot, even if it ruined the response in the current good spot.

 

[CraigRobbo]

I might be able to make time, but before that, is there any position in the room you have put the sub that has sounded good in the current dead spot, even if it ruined the response in the current good spot.

As of yet i havent been able to find any spot that has made the prime location good...

I didnt bother checking the already 'good spots' after i repositiond i was mainly concerned witht he prime.

Thanks mate

Craig

 

[Moonfly]

If it is indeed as bad as it seems, then thats a dead spot and will stay dead, by the sounds of things even with a second sub. All you can try is something with the room acoustics or moving the sitting position. Brian is better than me re the room acoustics. You could really do with getting REW up and running as well so we can see the systems response and compare sitting positions.

 

[CraigRobbo]

If it is indeed as bad as it seems, then thats a dead spot and will stay dead, by the sounds of things even with a second sub. All you can try is something with the room acoustics or moving the sitting position. Brian is better than me re the room acoustics. You could really do with getting REW up and running as well so we can see the systems response and compare sitting positions.

I had a feeling it was all in the room (so to speak)

Would you be able to bring your mic & setup down as i havent got anything that could really do it (or any clue on how to use the software ! LOL)

Would be greatly appreciated!

Craig