SPL Director User Manual page 10

Do bear in mind that dB scales do not represent linear but rather exponential increases. A 3 dB increase corre-
sponds to doubling the acoustic power, +6 dB correspond to twice the sound pressure level, and +10 dB corre-
spond to twice the perceived loudness.
When it comes to volume, the VOLTAiR Technology exhibits a performance, in regard to maximum level and dynamic
range, that is twice that of common components and circuits given that its values are approximately 10 dB higher.
THD measurements show a difference of more than 3 dB compared to the OPA134 at 36 V — in terms of sound
pressure level, that corresponds to an improvement of more than 50%. The operating level most commonly used for
audio equipment is +/- 15 volts.
Max. Audio Level
dBu
35
30
25
22,5
20
21,5
15
10
5
0
OPA 134@30 V OPA 134@36 V
10
33,2
SPL-OP@120 V
THD&N
dBu
-105
-106
-107
-109
-111
-111,7
-113
-115
TL 071@30 V OPA 134@36 V
I F R B
VOLTAiR – 120V Rail Technology
-114,2
SPL-OP@120 V