ALLNIC AUDIO H-3000 Посібник користувача - Сторінка 7
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screw type connector. This connector is the ground
connection for a ground wire from a cartridge and/or
turntable.
When you are facing the front of the H-3000, the two pairs of
MC connections are on the right/centre of the unit, with the
two MM connections immediately to their left on the other
side of the ground connection.
The H-3000 has been designed and manufactured to work
most synergistically with Allnic Audio preamplifiers, pre-
phono stages and equalization products.
D.
OUTPUTS
The H-3000 is equipped with one pair of unbalanced or
"single-ended" (RCA) outputs and one pair of true balanced
(XLR) output connections. The left channel output
connections are labeled "left output" and are just to the left
of the DC Source Input. The right channel output connections
are labeled "right output" and are on the far left hand side of
the rear of the phono stage unit (See Figure 1). In each pair,
the balanced (XLR) connection is labeled "1", and the
unbalanced (RCA) connection is labeled "2".
Above each pair of outputs, comprised of one single-
-ended (RCA) connection and one balanced (XLR)
connection, is a switch for selecting either the balanced
or the single-ended connector. The switches are labeled
"unbalanced output". Moving the unbalanced output
switches to the right (facing the rear of the unity) sets
the outputs to their respective unbalanced (RCA)
connector. Of course, the opposite position in each
case sets the switches for the balanced connectors. Be
sure to have both switches set for the connection you
are using. You may have both balanced and unbalanced
outputs connected at the same time without
introducing hum PROVIDED you have the output
switches set to unbalanced output.
E.
Moving Coil (MC) Transformer Controls
On the top of each channel's MC transformer on the
centre rear of the chassis deck of the phono stage unit,
there is a rotating control. Turn the control knob to select
from four gain factors.
The "#/#" scale corresponds to the turn ratio for the MC
transformer. Each position on the X# (factor) scale
corresponds to an increase in gain, indicated on the "+#dB
scale. You should use identical settings for both transformers
to avoid channel imbalance.
NOTE:
Please mute your H-3000, and/or reduce your
preamplifier's volume control, during transformer gain
adjustments. Be aware if you are increasing gain, that you
may hit an uncomfortably loud volume level.
F.
IMPEDANCE CONTROL
The Impedance control is located at the rear of the top
plate of the H-3000 chassis (see Figure 6). It has four
positions, 10, 20, 30 and 47 KΩ (thousand ohms). Use the
impedance control to match the H-3000 to the impedance
of your MC cartridges. By experimenting with the
impedance settings and the transformer controls together,
you can obtain optimum performance from your moving
coil cartridges. You will need to experiment to find the
"sweet spot" combination for each MC cartridge because
even the cables from your cartridge to the tonearm, your
internal tonearm cable, and your phono cable will all affect
impedance level. We suggest starting with the
specifications from your cartridge and using the
impedance level closest to that. Please refer to Table one
to see the possible combinations for MC cartridges and the
resulting operating impedances and gain. Of course,
impedance for MM cartridges remains constant at 47 KΩ.
In the Specifications section, you will read that the MC
input impedance for the H-3000 is up to 470 ohms. This
value represents the internal impedance of the cartridge
itself and is at the very extreme of what would normally be
expected for the internal impedance of an MC cartridge.
G.
A NOTE ON PHASE
Phase issues generally will result in lack of bass and/or
focus of the stereo image. You may need to reverse
connections on your cartridge if you are having phase
issues. As is usual in these circumstances, some trial and
error experimentation may be required to find the correct
position. The process is simplified for you with the H-3000,
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