Octave V 16 Single Ended, Owner'S Manual

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9. Option Pre-Out / Filter Function
9.1 Regulated preamplifier output – Pre-Out
The option regulated Pre-Out allows you to use an active Subwoofer or bi-amping if the
loudspeaker is constructed for bi-amping.
The Pre-Out has an internal output circuit with a low output resistance. The length of the cable to the
external unit is therefore not an issue. Furthermore the output amplifier eliminates interferences of
the cable and the connected unit that would otherwise affect the sound of the V 16 Single Ended.
The output amplifier is designed for the highest sound quality and matches with the sound of the V
16 Single Ended.
The Option Pre-Out comes with an innovative additional function. This is the filter function for the V
16 Single Ended output stage. It is easy to understand that it makes no sense to burden the V 16
Single Ended with the whole frequency response when the bass part is applied to the external power
amplifier or subwoofer. Low frequencies with a high level are limiting the output power of a single
ended amplifier as well as any other power amplifier with an output transformer.
To avoid this unnecessary stress we added a filter to get rid of the frequencies below 80 Hz. The
filter is flat down to 80 Hz / -3 dB. This low roll off frequency does not affect the middle- and high-
frequency sound characteristics.
Frequency response of the V 16 with and without the low frequency filter
As a result of this filter design the dynamics and the undistorted output power of the whole bi-amping
configuration increases by a multiple. The sound of the midrange also benefits from this technology
- this is the most important aspect.
The filter can be set ON or OFF with jumpers inside the V 16 (see chapter 6.2 “Setting of the Filter
Function”. If a headphone is active the filter is bypassed automatically. But in both cases the Pre-Out
is always active.
-24
+2
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
-0
d
B
r
B
20 20k 50 100 200 500 1k 2k 5k 10k
Hz
It is not possible to upgrade a V 16 Single Ended without the option Pre-Out to the
version with Pre-Out. This decision must be made when the device is purchased.