Blackstar Amplification S1-104EL34 Manual De Instrucciones página 13

30. Volume
This controls the overall volume of your amplifier. Turning it clockwise increases
the volume.
31. DPR (Dynamic Power Reduction)
The DPR control allows the output power of the S1-104 to be reduced anywhere
from 100W (100%) down to 10W (10%) of the rated power.
DPR works by controlling the power supply voltages to the
100W output valves and also the level of drive signal into the
power amplifier stage. Importantly, there are no components
placed in between the output valves, the output transformer
and the loudspeaker – a relationship which is essential in the
delivery of valve tone.
In addition to reducing the output power of the S1-104, the
DPR system actually controls the amount of power amplifier
compression too. Power amplifier compression is a key
ingredient in the characteristics of low powered valve amplifier
tone and gives a very playable 'feel' to the S1-104 at reduced
power settings.
We would recommend experimenting with the channel Gain and Volume, Master
Volume and DPR Control to achieve various combinations of preamplifier and power
amplifier distortion / compression.
Note: Generally speaking the more DPR is applied (i.e. power is reduced) the more
dynamic compression and power amp clipping will be experienced at any given
volume.
Clean DPR Operation
The DPR control is extremely powerful in fine-tuning the exact dynamic compression
characteristics of the power amplifier.
Channel Channel
Gain
Clean Low
Clean Low
Clean High
12
Channel Master DPR
Volume Volume
Mid Mid High
High High Low
High High Low
Description/
Sound Character
Maximum pre and power amplifier headroom
yields extremely dynamic clean sounds.
Increasing drive to the power amplifier and
reducing output power gives a compressed
clean sound rich in power amplifier induced
harmonics.
Higher channel gain further increases the
power amplifier drive producing a 'full stack'
crunch tone at only 10W output power.