spiny norman said:As an added nicety to the Y-adapter system I tried above, you could try adding an attenuator to the feed to the power amp driving the 'third speaker', or even better a potentiometer allowing you to adjust its level (unless the amp feeding it has its own volume control). Whenever I've played with the whole 'three-speaker stereo' thing, I've found it useful to be able to reduce the level of the centre speaker a little relative to the left and right, so it reinforces the sense of soundstage solidity rather than dominating matters.
And just to respond to the naysayers, yes it's possible to get a good solid stereo image from the right speakers in the right positions in the right room, but most domestic listening rooms are far from ideal, so however much you faff with positioning it can be hard to achieve, not to mention that the stereo effect only tends to work in a fairly narrow 'sweet spot' listening position. The third speaker idea can firm up the stereo image, and also keeps it over a much wider listening area.
Yes, of course it's an illusion, and all about fooling your ears, but then so is stereo!
You tell em Norman.