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In Reply to: RE: Which way to stack 57s? posted by jusbe on April 25, 2017 at 12:34:45
Never cared for stacking with the connections in the middle. This raises the center of gravity too high causing imbalance in the stack. I would stack like your current stack but raise the entire stack higher off the floor.
Follow Ups:
Thanks. That's the intention! I'm keen to try something like this, but with longer legs on the lower pair and supports which are braced (and shortened) just above the upper:
Big J
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
That is an interesting and aesthetically pleasing way to stack. But I don't think it is the best approach. Trying to get both Quads to integrate at the listening position never seems to work very well.
IME stacking so that one pair of the stack is optimized for the listening position seems to work best. The other Quad is used for reinforcement. This produces the most focused sound.
Stax stacked the F-81 into a single frame and called it the F-83. The listener will be on axis with the lower panel and the upper panel adds reinforcement, improves bass, larger overall soundstage image size, etc.
The Quad stacks rarely turn out that way..
There is no reason why the Quad can't be as well.
I didn't mean to imply that they can't but that most constructs don't.
Agreed. I don't think most stacking arrangements I have seen do a good job with the speakers.
do you mean aim for the listening position to face a convex curve of 57s, with the lower pair aiming at the listening position?
Like this?
Big J
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
No. The panels should be maintained in a vertical position, one on top of the other and raised off the floor so the lower pair is optimized for the listening position. This is how Quad proposed stacking the speakers. Trying to maintain the frame curve will not work nor will trying to tilt, etc. so that both speakers are aimed at the listening position.
Stacking the original Quad to extend the line source does not work. Given the height of the thing one will always be stuck with the 15 degree of vertical dispersion. What you have when you stack is two short line sources that beam 15 degrees in the vertical plane. There is no way around this. If you slowly stand in front of the stack you hear the vertical beaming and the suck out of high frequency in the middle of the stack.
The pic of the stack is a unique system put together by Ijaz Khan. I have spent many nights drinking Scotch with Ijaz listening to this system. The stack is not the main part of the system. If you look behind the stack you will see a single pair of Quads in a custom frame on a stand that raises the speakers about 18" off the floor. The single pair is vertical, no tilt backwards, and is aimed at the listener.
The stack is placed at an angle facing the side walls on the outside of the single pair. Ijaz is emulating the approach Robert Alister-Aikman used with his ESL-63. There are three pair of Quads used in this system. I have tried this approach myself but my room is far too live for it to work. Ijaz's room is heavily damped and the result is stunning he has spent years refining this approach.
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