ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn +49 (27 72) 42 905
Possible adjustments on the left 12 fold DIP switch „Input Resistance“ in unbalanced mode
The following chart shows you on the left column the value you get when you switch On
the Dip switch shown in the right columns.
U Value Dip No 10 09 08 07 06 05 04 03 02 01
5 Ohms -- -- -- -- on on on on on on
10 Ohms -- -- -- -- -- -- -- -- -- on
15 Ohms -- -- -- -- -- -- -- on on --
22 Ohms -- -- -- -- -- -- -- -- on --
32 Ohms -- -- -- -- -- -- on on -- --
47 Ohms -- -- -- -- -- -- -- on -- --
70 Ohms -- -- -- -- -- on on -- -- --
100 Ohms -- -- -- -- -- -- on -- -- --
150 Ohms -- -- -- -- on on -- -- -- --
221 Ohms -- -- -- -- -- on -- -- -- --
470 Ohms -- -- -- -- on -- -- -- -- --
1 K Ohms -- -- -- on -- -- -- -- -- --
2,2 K Ohms -- -- on -- -- -- -- -- -- --
4,7 K Ohms -- on -- -- -- -- -- -- -- --
10 K Ohms on -- -- -- -- -- -- -- -- --
47 K Ohms -- -- -- -- -- -- -- -- -- --
U
Value Dip No 10 09 08 07 06 05 04 03 02 01
Normally for the adjustment a value of about 5x to 10x the internal resistance
of the generator ( the cartridge ) should be used.
Most common MC cartridges have values between 4 to 25 Ohms,
so we recommend resistance values between 20 and 250 Ohms.
Higher values than 500 ohms makes only small changes in the sound characteristic.
We know from experience that when you are using an adjustment with a lower input resistance
the soundstage is deeper and is more precise, but the dynamic gets lower.
With a higher input resistance the overall performance is brighter and has more dynamic,
but definition and precision are decreased.
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 !
MM Cartridges can only be used in unbalanced mode !
For MM cartridges we recommend values of 47 k, what means all Dip switches left to OFF.
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: 221 and 475 Ohm combined (47k is fix): 1/Rt=1/221+1/475+1/47000 =1/0,00665 = 150
The result gives 150 Ohms when you switch Dip No. 5 and 6 to ON at the left Dip Switch.
High End Phono-Pre-Amplifier ASR Basis Exclusive version 2010 Page 9
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