Bryston SP3, Manual

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SP3 PREAMP / PROCESSOR
Pink Noise Test 2012-03-05 Page 1 of 4
SP3 Pink Noise Test
5-March-2012, Bryston Ltd., Stan Bleszynski
1. Introduction.
Pink
1
Noise Test features allows adjusting and correcting relative speaker efficiencies by
playing the noise sound of known and constant intensity through each speaker channel,
while recording the sound pressure with a sound pressure meter
2
.
2. Starting the Pink Noise test from the Front panel:
Go to SYSTEM SETUP-->TESTS-->PINK NOISE
If you press right arrow again it will go into the "Pink Noise" screen (see above) and will
start playing the noise in the AUTOCYCLE mode, that is it will go through all the
enabled speaker channels
3
for a few seconds each, repeating ad infiniti. To exit press the
left arrow or power/standby button. Bottom line label “SETVOL:” indicates that it is
possible to adjust the global volume level (-80dB to +12dB) with the volume knob – that
is the case only when the Left Front speaker channel is playing!
Adjusting volume level while other than the L channels is playing, only changes the
specific Speaker Level offset within -12dB to +12dB range (as in SOURCE SETUP--
>SPEAKR LEVEL screen) rather than the global volume! This situation is shown on
the screen below where the bottom line label changed to “SPK LEVEL:”
1
The term “pink noise” as opposed to “white noise”, refers to the spectral characteristics of the sound,
where the spectral power density is higher for lower frequencies, or more specifically each octave carries
an equal amount of power (see http://en.wikipedia.org/Pink_noise ).
2
Sound pressure meter is an external accessory not included with the SP3.
3
If all speakers are enabled then it will go through L,C,R,Rs,Rb,Lb,Ls and Subwoofer (subscript s means
“side surround”, b – “back surround”). Disabled speakers - those configured as “None” in the SOURCE
SETUP

SPEAKER SIZE, are skipped.
APPENDIX
L
SP3 PINK NOISE TEST