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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 christian

christian's avatar
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christian
78 posts
 

@johnread57, very glad you got this worked out!

Enjoy!

christian's avatar
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christian
78 posts
 

Standing waves and null zones.  Only way to really solve is experiment with placement (speakers and listening position), and then augment with bass traps.  Analyzing using REW or the like will help in a more efficient journey towards a solution, as I wouldn't look forward to lugging those phenomenal speakers you have across the four corners of the room.

christian's avatar
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christian
78 posts
 

Bass traps in the corners will remove mudiness in the bass notes but they are not a cure for no bass. Ie. Bass traps don’t make more bass, they make the bass you have better.

Absolutely agree, except in the case if the OP has to work in the "constraints" of his room placement and winds up with the only place for his listening position that doesn’t have a "null" has a slight "peak". I shouldn’t have phrased the traps in tandem with speaker placement. Appreciate the clarification!

plant caddies can work for your method of finding placement

My wife’s a total green thumb; but this idea never popped into my mind; great suggestion!  My narrow-minded thinking could only picture "walking" the beasties around the room in a sea of sweat. 😆

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