Mika K's system

[Thing Fish]

You didn't used to be Chris Evans did you...

[Ali Tait]

Eeeek! Now that would be something to hear.

Yes indeed, I bet they are quite something.

[Mika K]

They are indeed.

But perhaps should have mention that the guy leaning to the stacked ESLs is the proud owner and not me. Just to make it clear

[MartinT]

ARA (of SME) only used to have double-stacked Quads, those must really be something.

[Rare Bird]

Triple 57's! .. i've head pairs they are good as it is..

[The Grand Wazoo]

I'd be interested to understand the geometry of mounting three of those in a (presumably) bespoke stand. The angles you choose for tilting them back must be fairly critical for the best sound, I'd have thought.
A stacked pair has the bottom one angled to point very slightly downwards & the top one a little up & this works well in rooms with average to large ceiling height. But how would you arrange three? The sheer height of the construction must surely have the top one firing almost exclusively at the ceiling unless you have a cavernous room?

[Reid Malenfant]

But how would you arrange three?

Assuming they were all driven together with no delay applied to the centre 57 i think the top one & bottom should be angled so that the tweeter panels are the same distance from the listener, a little like this:-

./
|----------listener
.\

Otherwise there would be a lot of cancellation due to comb filtering imo

[Reid Malenfant]

Actually, if you look carefully at the picture i think you'll just about to be able to make out that this may well be the case The frame definately looks (though it is difficult to make out) as though it is bowed towards the listener at the top & bottom & the panels look flush to the sides

[Mika K]

Mark understood perfectly the shape of the stacked ESLs. They really are angled so that the hot spot is approximately 4.5-5m from the speakers. This works extremely well as the directivity is really tight and really nails the performance to its place.

I have some pics of the ESL shape taken from the side and will try to post this here later..

[The Grand Wazoo]

So how was the distance of 4.5 - 5 metres settled on? Was it purely to suit the specific room?