ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn +49 (27 72) 42 905
With a
higher input resistance
the overall performance is
brighter
and has more
dynamic
,
but definition and precision are decreased.
Higher
values than
500 ohms
makes only
small changes
in the sound characteristic.
You can easily find out the perfect setting for you: make an adjustment and listen to the system.
! The best adjustment is the one you like best !
We don’t recommend higher values than 9,4 K Ohms in balanced mode, cause
this may cause higher noise and maybe unstable operation of the input stage.
By using
combinations
of Dip switches you can get additionally values for the resistance.
Formula for the Calculation : 1/R total = 1/R1+ 1/R2+ 1/R3......
Example: 44 and 94 Ohm combined (47 k is fix): 1/Rt=1/44+1/94+1/47000 =1/0,033 = 30 Ohms
The result gives 30 Ohms when you switch Dip No 2 and 3 to ON at both Dip Switches.
3.3
Adjusting the input resistance in unbalanced mode
Adjustment of the
input resistance
(from 5 ohms to 47 kilo ohms) can be easily made on the
switches No. 1-10 on the 2 pieces 12 fold DIP switches named
„Resistance Adjust“.
MM Cartridges with 47 K load can only be used in unbalanced mode !
In
unbalanced mode
only the left Dip switches
No 1 to 10
per input channel
must be adjusted.
At the right Dip switch only the switch No. 12 has to be switched ON.
That shortens the negative input to ground.
The column at the left half between the two rows of Dip switches marked with “
Unbalanced”
shows the resistance values for
unbalanced
mode.
For example for 100 Ohms you have to switch Dip No. 4 at the left and the right Dip switch 12
to ON. For 1 k for example put Dip No. 7 at the left and the right Dip switch 12 to ON.
Adjustment for
1000 Ohms
unbalanced
High End Phono-Pre-Amplifier ASR Basis Exclusive version 2010 Page 8
