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Channel A / B selection
BACH has two independent inputs. You can
switch over from one to the other on the fly by
pressing the push button located near the A/B
indicators.
Gain Selection Adjustment
Each input has 3 gain settings. 50dB, 60dB or
70dB. The 50dB setting is intended for MM-
cartridges or step-up transformers, whereas the
60dB/70dB gain is used for MC-cartridges. Again,
you can switch over from one to another on the
fly. When changing from A to B or vice versa, the
chosen setting will be stored. If the gain setting is
too high (e.g. 70dB for a high output MC) you may
experience
clipping.
As
a
warning,
the
corresponding
gain
LED
lights
up
during
playback. There is now 6dB of headroom left, but
reducing the gain is highly recommended.
Cartridge Loading Adjustment
Set the resistive load to 30Ω, 100Ω, 300Ω, 1kΩ or
47kΩ depending on the cartridge manufacturer's
recommendations or by listening. The 47kΩ
setting is for MM only and only works with the
50dB gain setting. It is disabled for the 60dB / 70dB
gain setting. Once chosen, you can not increase
gain from 50dB to 60/70dB. First, reduce the
impedance to at least 1kΩ. For step up
transformer operation it may be valuable to try to
use the 50dB / 1kΩ setting.
9
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