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

Those that suggest it's speaker position are correct.  It's a common problem when the speakers and listening position are both 1/3 into the room.  

I suggest researching Dave Wilson's process of positioning speakers and listening positions.  It will also help you brush up on your public speaking skills.  

consider a ’swarm’. i’ve been in a 12’ x 12’ x 8’ very small room with great bass. when you look at the room no way it should work, but it does.

not cheap, cheap, but not crazy spendy either. cheaper than trying to build another room or find another house. and......drum roll please.....it actually works.

http://www.audiokinesis.com/the-swarm-subwoofer-system-1.html

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.

What are you sitting on when listening? I ask this because I had a lack of bass and a thin midrange until I got rid of an overstuffed sofa w/attached chaise and replaced it with some Barcelona replica chairs. 

It seems the sofa was sucking the life out of my system.

All the best,
Nonoise

My first (serious) system that I had in our previous house exhibited a similar problem, only that it was in a living room adjoining the dining room. Long and narrow space with system agains the short wall. Not long to discover that when I stepped into the dining area while system was playing, insane bass would suddenly emerge.

the dining area was separated by a ceiling archway opening that dropped into about 2ft of wall space on either side of the opening, which seemed -in a manner of speaking - to act as a bass trap. When I got fed up and just moved the system against the long wall of the living room, wallah! All the bass I needed (too much in fact). Some slight adjustments did dial things in over time. 

try mining it to a long wall to start? Just for reference. Another consideration is a corner placement, which has been known to help break up potential standing waves.

Ultimately, some pretty expert advice from everyone before.

This is frustrating, but a placement change should definitely fix this!

Best of luck 🙏🏼👍🏼