Dan D'Agostino Momentum Manuale d'uso - Pagina 7

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OPERATION

Initial power-up of the preamplifier

To power-up the Momentum HD Preamplifier, you need to use two switches. One is located

on the back of the power supply; this switch turns the AC power on so the power supply will

be active. The other is the Standby button located on the front of the preamplifier.

First, flip the switch on the back of the power supply to the On position. Then press the

Standby button on the front of the preamplifier. This will power up the preamplifier and

illuminate the volume indicator.

After power is switched on, the Momentum HD Preamplifier requires approximately

30 minutes to reach optimal operating temperature. Although the preamplifier will sound

excellent upon initial listening, the sound quality will improve as it warms up to optimal

operating temperature.

Basic operation

The Momentum HD Preamplifier offers only a few basic functions: power on/off, volume, source

selection, phase and mute. Operation is simple, but here's a brief description if you need it.

Standby: The Standby button is located on the front panel of the preamplifier. When the

preamplifier is in standby (off) mode, the LED in the middle of the button will be lit. Push the

button to turn the unit on. When power is on, the LED in the middle of the button will go off and

the volume indicator will illuminate. Push the button once more to turn the unit off. The light for

the volume indicator will go out and the LED in the middle of the Standby button will light up.

Volume: Turn the ring around the volume indicator clockwise to raise the volume and

counterclockwise to lower it, or use the Volume +/- buttons on the remote. The needle indicator

will move toward the right as you increase the volume and to the left as you decrease it. We

recommend you turn the volume down when you initially power up the system, and raise it only

when you are assured that all components in the system are operating properly.

Source selection: Simply push the front-panel button or remote button that corresponds with

the source you want to hear. The LED in the middle of the front-panel button for the currently

active source will light up.

Gain adjustment: The Momentum HD Preamplifier can be set for +13 dB or +19 dB gain. The extra

volume provided by the latter setting may be needed to achieve sufficient output level with a

power amplifier that has relatively low gain. The default setting is +13 dB. To switch to +19 dB gain,

turn off the master power switch on the back of the power supply. Hold down the Standby and

DAC buttons on the front panel of the preamplifier, then turn the power back on. Release the

buttons when you see the lights on the front panel come on. To return the gain to +13 dB, turn off

the master power switch on the back of the power supply. Hold down the Standby and Server

buttons on the front panel of the preamplifier, then turn the power back on. Release the buttons

when you see the lights on the front panel come on.

Theater: By using the Theater Bypass input, you can interface the Momentum HD Preamplifier

with a multichannel home theater audio system. To use it, connect the left- and right-channel

outputs of your surround-sound processor to the Momentum HD Preamplifier's Theater

Bypass input. This input bypasses the preamplifier's volume control; use your surround-sound

processor's volume control instead. Push the Theater button on the front panel or remote when

you want to listen to surround sound. Push any other source button to return the system to

stereo mode.

Tone: To activate the tone controls, push the Tone button on the front panel or remote. The LED

in the middle will light up, indicating that the tone controls are active.

Bass and Treble controls: When the LED in the middle of the front-panel Tone button is on,

these controls will be active. Turn them clockwise to boost, counterclockwise to cut. The front

panel indicates the level of boost or cut in decibels (dB). When adjusting these controls, we

strongly recommend you first disengage the tone controls using the Tone button; make the

adjustment; then push the Tone button again to re-engage the controls. This is because the

preamplifier is DC-coupled, with no capacitors in the signal path. This design gives the best

sound quality, but it can result in some noise when the treble and bass knobs are turned.

Phase (remote control only): The Phase control inverts the polarity of the entire system.

While the Momentum HD Preamplifier does not invert polarity, many source devices do, and

many recordings are produced with inverted polarity. Because you have no way of knowing

what the proper phase is, you must set this control by ear. Push the Phase button on the remote

control to invert the polarity. The light on the preamplifier's front dial will turn from green to red

when the phase is inverted. Try listening with the phase normal or inverted, and use whichever

setting sounds better. If you can't hear a difference, don't worry about it. Depending on the

recording, the effects of phase inversion are often subtle and sometimes even inaudible.

Mute (remote control only): The Mute control simply mutes the volume temporarily. Press it

once to mute, and again to restore the volume. When the sound is muted, the light in the volume

indicator will flash.

Balance (remote control only): The Balance control lets you shift the stereo balance to right or

left. To activate it, press the Balance button on the remote. The volume indicator on the face of

the preamplifier will swing to show the current balance setting. Use the Volume +/- buttons on

the remote to change the balance setting. If the needle points straight up, the balance is even

between left and right. If the needle points to right or left, the balance is shifted to that side.

To return the balance to the center, hold down the Balance button on the remote for 2 seconds.

The meter backlight will flash to indicate the reset, and the needle will return to center.

Dark Mode:

Dark Mode blanks out the multi-function meters and LEDs after 15 seconds of

illumination. The Dark Mode is selected or unselected by holding the Standby button in for

several seconds while the unit is in Standby Mode. All front panel lights are disabled unless

a change is made on the front panel to any of the controls. During a change, the LEDs are

illuminated but will re-extinguish shortly after the changes are made.