Hi,
I've changed the subject title as I was deservedly reprimanded for
not changing it in my initial post.
From: Fons Adriaensen <f...@linuxaudio.org>
Date: 19 March 2014 20:21:34 GMT
To: sursound@music.vt.edu
Subject: Re: [Sursound] Sursound Digest, Vol 68, Issue 17
On Wed, Mar 19, 2014 at 07:50:43PM +0000, Dave Hunt wrote:
Surely the best approach is to feed the noise signal (post decoder)
into each speaker channel in turn and adjust the amplification on
each channel until the level measured at the centre listening point
is the same for each speaker.
That would be a prerequisite for the method I explained.
But it still leaves you with an uncalibrated system, as
the decoder gain (no matter how you define it) isn't
included.
Agreed. I was just stating the prerequisite, as this seemed to have
been missed.
From: Fons Adriaensen <f...@linuxaudio.org>
Date: 19 March 2014 20:30:01 GMT
To: sursound@music.vt.edu
Subject: Re: [Sursound] Sursound Digest, Vol 68, Issue 17
Reply-To: Surround Sound discussion group <sursound@music.vt.edu>
On Wed, Mar 19, 2014 at 07:50:43PM +0000, Dave Hunt wrote:
The panning approach won't work, as all speakers would be excited at
various different levels.
Anything to substantiate that claim ? Practice ? Theory ?
W will excite all speakers equally, assuming the decoder is correct
and all speaker gains matched to produce the same level at the
centre. Higher orders will excite more than one speaker at differing
levels and polarity. This "crosstalk" (for want of a better word)
falls as the order (and number of speakers) rises.
FYI, I have used this method a number of times, with excellent
results. I've also done the maths that show it do be correct.
I'm sure it is, assuming that the basic installation and set up is
well and thoroughly done. It would be very confusing and time
consuming to attempt to use your method without having done "the
prerequisite".
It is always a bit disconcerting to hear how, with even a set of
identical "good" speakers producing the same level of pink noise,
each sounds different. Yes, rooms and positions in them sound
different, but this is often observable when just swopping one
speaker for another in the same location.
Ciao,
Dave
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