Axiom Home Page Forums General Discussion Stereo Bass reduction when sitting down

Riker, I think the Klingons may have arranged your twin subs so the low frequency waves cancel each other out. You may want to use your 0-180* function.

Or, find a Lirpa Loof and recrystalize the Lay Z Boy.

Stephane, I've pondered this for a few minutes, but the reported effect is puzzling. The floor to ceiling room mode is actually at its minimum midway between the floor and ceiling, so this primary mode, which would be around 71Hz for an 8' ceiling(1130/{2x8})would actually be a bit louder when you sit down. The magnitude of the effect is especially puzzling. Ponder...ponder...ponder.

John. Ear height sitting is pretty close to the 4' level. Certainly closer than when standing. I have a deep narrow null at 71ish Hz. at ear height in my room, but it is not that audible.

I am wondering if there is a combination of things going on to create a wider null. Reflections from the front/back of the room maybe??

Fred, I was using about 30" sitting and 60" standing. Certainly not enough below or above mode minimum to explain anything like the reported bass effect, but I mentioned it.

Have you tried the sub crawl?

Not sure if anyone has mentioned this yet but you could try elevating the speakers. To see if moving them in the vertical plane has any effect. Even if you can’t keep them like this it might help determine if it’s the effect of a vertical room mode. You could also try angling the speakers up to see if that helps clear up some of the nasal sound.

I find that my front soundstage sounds much better, more ambient and more precise, when my front speakers are elevated so that the midrange drivers rather than the tweeters are at ear level.

What bothers me the most is that the speakers have plenty of bass where they are currently located, but In order to bask in that wonderfull bass, I would have to sit 3 feet in front of them, which is not practical. I am not sure that moving the speakers would help since they sound really good where they are, except when I sit down on my loveseat, the bass is greatly reduced. What I will try this afternoon or tonight is to remove my seat completely and try a combination of different chairs at the same location, then move the chair that sounded the best backwards and forwards until I find the best sound. If that does not yield good results, then I will flip the room around 180 and see what effect that has.

These are brand new speakers that I got a week ago and in every respect they are superior to my previous pair. The previous pair had considerably less bass capabilities so I had to run them with the Subwoofers all the time, otherwise it sounded way to thin. But these new ones have really good bass for small drivers. It is a transmission line design with under hung drivers, similar to Thiel and Wilson. The bass out of these is of sufficient enough quantity and quality that I don't need a subwoofer engaged to hear good music. On movies, well the subs are obviously on.

The Adagios have a D'apolito configuration, the tweeter is actually slightly above ear level when I sit down. The bottom driver is more inline with my ear.. I mean it's still pretty close since I am 10.5 feet away and the speaker is 4 feet tall with 2 X 6.5 drivers and a ribbon tweeter, but I would not say that the tweeter is exactly at ear level in my case.

Here is a link to my room setup

http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showgallery&Number=276319#comments

These are older pictures that show my Energy Veritas 2.3s and not my new Acoustic Zen Adagios but the room layout is exactly the same. I will be updating the pictures very soon with the new speakers and acoustic treatment that is now in place.

Unfortunately, the raw materials I need can only be found on Praxis... and we all know what happened to Praxis !!!
But your sugestions makes perfect sense to me