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In Reply to: RE: Would you consider doing this? Yea or Nay posted by Tidycat1 on January 05, 2017 at 21:21:22
A coaxial speaker like the LS50's is designed to have a reasonably smooth off axis response as a function of frequency. Stacking negates that benefit.
If your goal is a broader image - use the second pair behind and outboard of your main pair of speakers...
Bare in mind I have dabled in stacked speakers back in the day... I help a guy do Stacked and inverted Dahlquist DQ10's in 1982... looked a bit daunting - wish I still had the picture. And in 1978 I set up a pair of stacked Advents - again inverted in our retail store (StereoTown DesMoines West and it actually resulted in several sales, including a stacked (4 pair) of Cerwin Vega 15 inch speakers to a Disco south of DesMoines (driven by 4 Citation 16 Power Amplifiers!).
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
Follow Ups:
...I had DQ-10s and modified them back in the early 1980s (TAS published an article I wrote about it).
A friend had stacked DQ-10s on a special frame and after hearing mine, he decided to sell one of the pair and have me help him do the mods.
The stacked pair provided a big sound but it wasn't very focused.
I noted the same thing on HP's idea of double Advents back in the mid 70s, more focus with just a single pair.
It's the break down of coherence. the distance between a driver is a measure of the frequency rolloff of the two drivers.
So a full coaxial speaker would have to have both cones within something like 4" of each other. Otherwise lobbing starts to occur.
Aaaahhhh, I remember that stacked Advent years.
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