ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn +49 (27 72) 42 905
3.4
Adjusting the input capacity
The input capacity in
unbalanced
mode can be adjusted on the left DIP switch No. 12:
position „Off“ = 100pF, „On“ = 320pF. Number 11 at the left dip switches to 570 pF.
You can easily determine the value for your cartridge by using
the cartridge manufacturer’s recommended value and subtract
the capacity of the phono cable you are going to use –
the result is the value you have to adjust in your ASR Basis Exclusive.
For
balanced mode
you can use the Dip switches Number 11
left
and
right
to in increase the input capacity from 100 to 570 pF.
This can be used to filter Radio frequencies that are picked up from
the tonearm cable.
Also of the input stage work more stable with higher input capacities.
3.5
Setting the gain
The gain can easily be adjusted on the 6 fold DIP switches „Gain Adjust“.
The switches can be combined to get higher gain.
The minimal total gain of +32 dB is obtained with all Dip switches
in OFF, the Maximum total gain of +70 dB (32+ 38dB ) is obtained by
putting all 6 DIP switches to „On“.
To know the adjusted gain please add the following values to 32 dB
switch No. „On
“ none 1 2 3 4 5 6
gain:
0dB +4dB +8dB +12dB +18dB +24dB
+32dB
When you set combined Dip Switches to ON, the gains does not add up ! For Example :
when you switch for example No. 3 and 4 to
ON
you will have a gain of 22 dB,
not
30 dB.
Please set the DIP switches exactly the same for the right and the left channel ( only exception from
this rule: your cartridge has different output levels at the right and left channel ).
!! The gain should be set as low as necessary to get lowest possible noise !!
3.6
Setting the low frequency cut OFF
With the 2 pole-Dip-switch named „Low“ the low
Cut Off
frequency can be
adjusted between 2Hz (position „ON“) and 20Hz (position „OFF“).
In the position 20 Hz (OFF) low frequent disturbances like rumble are reduced.
As a result of the acoustically favourable 6 dB characteristic, however,
these are not suppressed completely.
In the position 2 Hz (ON), the frequency range is wider into the subsonic area.
When you audio equipment has a very low frequency resolution, the bass
signals can be even more substantially and may have more impact.
High End Phono-Pre-Amplifier ASR Basis Exclusive version 2010 Page 10
