2. speakers
  3. 184411-84411

Bass only when I stand up…

Weird experience.

Wired up my system and sit down in my office chair. The bass disappeared. Stand up, and alakazam, the bass is back full and wonderful. It’s like swimming in the sea, there are horizontal layers of different temperatures. Quite distinct.

Ok, system info:

Speakers - PMC MB2SE

Power amp - Marantz 8807

Preamp - Marantz 8005

Sources - Pioneer LX800 or N70ae

Room - carpeted, 4.27x5.5x2.75m, acoustic insulated plasterboard and timber frame

Shape? Left side where door is, has duct risers that create 800mm boxes either side of the door. I’ve tried attaching a photo but didn’t work. Try here: link

Speakers placed 600mm out from the 4.27 wall, with the opposite wall being a library and office desk.

Tried? Raising front and rear speaker stands 1” to point speakers up or down slightly with no effect.

I welcome ideas 💡 yet realize there are constraints here too.

128x128johnread57

Showing 3 responses by erik_squires

erik_squires
15,861 posts
 

I am _NOT_ suggesting the OP go this route, especially now that the issue has been solved, but the basic problem is one that lends itself well to satellites with subs. 

If you _must_ place the speakers in a sub-optimal location for the bass then maybe even just 1 sub while high passing the main speakers can work supremely better, assuming you have better luck with the sub locations.

erik_squires
15,861 posts
 

No worries, bass traps were the end of the continuum of choices, not the start.  Moving your speakers was definitely the place to start, but if you could not  or if it wasn't enough then bass traps were next.

Glad you got it sorted.

erik_squires
15,861 posts
 

Did a quick analysis here:

 

https://amcoustics.com/tools/amroc?l=550&w=427&h=275&r60=0.6

 

Your speakers and listening location are not ideal due to the modes that will express most strongly at the ends of the room between 30 and 70 Hz. The location of your library/desk area also limit bass traps to the ceiling and far wall, so whatever you use it has to be super effective per square foot.

If possible, move the speakers further out into the room.  At least twice as far.

Start with floor to ceiling GIK soffit traps in the area behind the speakers. This should help a great deal. If that’s not enough add soffit traps across the top and bottom of the far wall. You can also consider using monster traps there as well.

I don’t think you’ll need the range limiter unless you also feel your system starts to sound thin after the soffit traps. If that’s STILL not enough you’ll need to put soffit traps from the top of the traps behind the speakers to the edge of your bookshelves.

https://www.gikacoustics.com/product/gik-acoustics-monster-bass-trap-flexrange-technology/

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