Stereolith Loudspeakers Question

[pelanj]

Originally posted by el`Ol
or that?

Where are the woofers? I am not sure if it would work like this - but with a small modification it could. Or I do not understand it

[Elias]

Hello,

Stereo signal from one loudspeaker is an interesting idea.

I would like to keep it dipole to avoid the problems associated to the box.

How about something like this. Two dipoles cross each others. The other is fed R+L signal and the other R-L signal.

Red indicates the radiated signal at the given direction. Here we can have L+R directly towards the listener. R and L signals are pointing 45 degreed sideways which means they can be reflected from side walls to the listener. 'Surround' signal L-R generates 'ambience'.

Any experience of this, anyone?

- Elias

[Elias]

A variation. Cross at different angle and feed R and L signals. This will produce same radiated signals.

I think in practise the first version might be better because direct signal comes from one speaker (L+R), but in theory they are the same.

- Elias

[pelanj]

Where have I seen something similar...yes I know! Graaf's avatar))

[simon dart]

Very interesting Elias: M+S Stereo! ( Mid and Side) I had this thought too.

I used to work in broadcast sound in the BBC in the 90s where we used to use this system for originating sound for TV. The great advantage with it is you can vary the image width to suit by altering the gain of the S signal. This would surely be a worthwile experiment. I don't have any dipoles to try it though.

[graaf]

Originally posted by pelanj
Where have I seen something similar...yes I know! Graaf's avatar))

yeah!

it's Blumlein's stereo

unfulfilled promise so far

best!
graaf

[Elias]

Hello,

Originally posted by simon dart
...
M+S Stereo! ( Mid and Side)
...
I used to work in broadcast sound in the BBC in the 90s where we used to use this system for originating sound for TV. The great advantage with it is you can vary the image width to suit by altering the gain of the S signal. This would surely be a worthwile experiment. I don't have any dipoles to try it though.

Very interesting. I suppose it was studio environment you used to listen? How about in normal reverberant living rooms?

There must have been good reason for BBC to use this system, can you reveal what was it? Anything related to perception of image or similar reasons?

You can do a dipole by placing two monopoles back to back and driving in opposite phase. For the system I draw, you need then four small boxes. Like a cube, speaker element on each horisontal side.

Tell more of your listening experience on this!

- Elias

[graaf]

on the other hand: http://www.earesistible.de/swamppatrol.html

[graaf]

http://www.digitalartweeks.ethz.ch/w...cial_offer.pdf

creates sonic environments as good as 5.1

[david yost]

Very interesting discussion, all.

Elias: I have a pair of old Epicure M400+ speakers that are somewhat like the dipoles you describe in that they are a 40" tall square box with a 2-way speaker system on each of the 4 vertical faces--an early 70's omni. I may try your proposed connection and will report on sound. Unfortunately, all of the woofers share a common volume, so bass alignment will be shot to hell.