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Re: Anyone knows which Krell amp Alastair Robertson-Aikman used to drive his stacked Quad 63? (NT)

Posted by klausDK (A) on April 28, 2007 at 01:54:50

In Reply to: Anyone knows which Krell amp Alastair Robertson-Aikman used to drive his stacked Quad 63? (NT) posted by mon on April 26, 2007 at 13:25:13:

Hey mon
I do not know which Krell amps he used, but they are early very big Krells.
What I know however is that he didn’t use his heavily modified Quads stacked.
He did use one set firing directly towards the listener and another set placed behind and at the outside of these. Oriented in such a way that they had there acoustic null facing the listener, and their direct sound directed towards the side wall at the first reflection point of the main pair.
This increases the energy reflected from the sides and also makes the frequency response of the first sidewall reflection much more like the frequency response of the direct sound.
So his setup gave him 3 main advantages over a single pair of Quads, more spacious sound coming from more early (but not very early!) reflected energy, higher sound pressure than a single pair will give, and last but not least,a more even direct versus power response.

Best wishes from Denmark.
KlausDK

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