SPL Elector Preamp (Red) - Manual (Page 9)

9
VOLTAiR – 120V Rail Technology
Do bear in mind that dB scales do not represent linear but rather exponential increases. A 3 dB increase corresponds
to doubling the acoustic power, +6 dB correspond to twice the sound pressure level, and +10 dB correspond 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 8 dB compared to the TL071 at 30 V — in terms of sound pres-
sure level, that corresponds to an improvement of more than 130%. The operating level most commonly used for
audio equipment is +/- 15 volts.
Max. Audio Level
OPA 134@30 V SPL-OP@120 V
0
5
10
15
20
25
30
35
dBu
21,5
33,2
TL 071@30 V SPL-OP@120 V
-115
-113
-111
-109
-107
-105
dBu
-106
-114,2
THD&N
I R F