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Re: Bass reduction when sitting down
Riker #322831 09/16/10 02:59 PM
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Originally Posted By: Riker
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.


Well, If you only get bass sitting 3 feet away from them, it doesn't matter how good the bass is. I mean to me, it only matters to me how good a speaker sounds at my listening position.


paul

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Re: Bass reduction when sitting down
Worfzara #322840 09/16/10 03:27 PM
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You should have bought M80's, they are magical and would solve all your problems wink

Looking forward to your results, very puzzling situation.


Jason
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Re: Bass reduction when sitting down
JohnK #322849 09/16/10 03:48 PM
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Originally Posted By: JohnK
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.


I'm a bit taller than average but the numbers I use are 72" standing and about 54" sitting. With an 8 foot ceiling and bass source 6" off the ground (Riker, how far off the ground is the port ?) then that would put my ears right at the null when sitting (I think).

Presumably turning up the volume would make the bass come out a bit further from the speakers before falling to the ground, but I'm sure someone has already mentioned that wink

Last edited by bridgman; 09/16/10 03:48 PM.

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Re: Bass reduction when sitting down
bridgman #322857 09/16/10 05:00 PM
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You're sitting in a bass null. You have to move the speakers or the listening position a bit. Simply pulling them out from the wall and extra 3-4" might even do it.


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Re: Bass reduction when sitting down
tomtuttle #322861 09/16/10 05:28 PM
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Hi guys, some measurements:


The port on the Adagios is on the Front of the speaker, 4" from the ground, 2 1/2" high and 7 " wide (rectangle port) No ports in the back. Transmission line design.

The speaker is 48" tall (49" with the plinth and spikes), 13 1/2" deep, 9" wide at the front then tapers down to 4 1/2" in the back. Similar to the M80s tappered cabinet design.

The first 6 1/2 driver is 31 1/2" (center of cone)from the floor.

Next is the tweeter which is 38" from the floor (center of cone)

Then the other 6 1/2 driver which is 45 1/2" from the floor (center of cone)

Measurements from wall surfaces are taken from the walls to the center of the speaker cabinet.

Right speaker is: 26 1/2" from back wall and 23 1/2 from side wall.

Left speaker is: 26 1/2" from back wall and 9 ft from side wall.

Now, I'm going to move some furniture / chairs and see what I can come up with. Will report later the afternoon on my findings.
Cheers




Last edited by Riker; 09/16/10 05:30 PM.

Acoustic Zen Adagio, Veritas center, Axiom EP500, QS8s, Anthem AVM20, MC20,Adcom GFA7400
Re: Bass reduction when sitting down
Riker #322873 09/16/10 06:39 PM
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I bet you're losing the port output when you sit down wink


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Re: Bass reduction when sitting down
bridgman #322888 09/16/10 07:09 PM
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Just tilt a little to one side like Ray.


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Re: Bass reduction when sitting down
tomtuttle #322904 09/16/10 08:38 PM
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Well I think I have NULLIFIED the issue grin

I tried moving the speakers to the other side of the room, where the sitting area was, and that gave me more bass but the rest of the sound was terrible. It was worth a try. I put the speakers back where they were except much further out from the back wall. They are now 38" from the back wall to the front of the speaker. The biggest change was moving my loveseat completely up against the back wall .. Voila.. instant bass with no compromise on overall sound quality. I still have to put up a few acoustic panels on the wall behind the seat just to clean up the high end a bit, but it sounds very good from there.

My seat was initialy 4 feet from the back wall as I was observing this 3rd of the room "rule" where the listening position needs to be somewhere around 1/3rd of the lenght of the room.. or something like that. It works great for tv viewing, surrounds are in nice position etc.. but with the new speakers it sounds MUCH better with the couch right up against the back wall. Now my QS8s are actually slightly in front of my head.. But I don't think this will be a huge problem, the QS8s are very forgiving in placement.


Now the only issue is my 46" tv looks to SMALL from that distance cry.. Ah well, I guess that means I need a 60" TV then cool

Thanks everyone for the very helpful sugestions and ideas..
Cheers


Acoustic Zen Adagio, Veritas center, Axiom EP500, QS8s, Anthem AVM20, MC20,Adcom GFA7400
Re: Bass reduction when sitting down
Riker #322913 09/16/10 09:12 PM
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We have a winner ! smile It took me about 3 months to figure and find the best location to all my speakers. Many changing position and listening test. Glad you find your setup. I bet you will move everything again soonly just to test once again if you right wink

Last edited by Philippe; 09/16/10 09:14 PM.

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Re: Bass reduction when sitting down
Philippe #322928 09/16/10 10:58 PM
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The next move will be to make room for new Home Theater Seating which I am going to procure next spring. Then a new bigger tv.. but I think the speakers should stay relatively where they are and so is the seating position.

But hey, never say never !! LOL..


Acoustic Zen Adagio, Veritas center, Axiom EP500, QS8s, Anthem AVM20, MC20,Adcom GFA7400
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