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アンプ Archangel X7のPDF クイック・スタート・マニュアルをオンラインで閲覧またはダウンロードできます。Archangel X7 6 ページ。 Acoustic instrument reference preamplifier / di
ページを印刷するGain Control
Note: The gain control has 15 complete revolutions in it's travel from minimum to maximum.
The gain control is accedes by removing the 4 screws securing the bottom plate. The gain
control is a blue box with brass adjustment screw. Using a jewelers screwdriver, turn the
screw clockwise to increase the gain and counter-clockwise to reduce it. At the lowest setting
the gain is 0dB for unity gain. At the highest setting the gain is 21dB for 11x amplification.
The gain control is centered when shipped. It must be reduced for single piezo elements mounted
directly to the soundboard (like ukeleles), and for active electronics or heavy percussive playing styles.
To test the gain settings for acoustic instruments with piezos, tap the bridge or soundboard with your
palm using a fair amount of force. For electric instruments and magnetic pickups, play the loudest
passages you will process with the X7. Decrease the gain if there is popping or clipping coming from
your X7. Ipods, keyboards, and similar line inputs may need their master volume level reduced before
processing the signal with the X7.
Mod Switches
The X7 continues one of our most popular features from previous generations. The Mod
Switches allow you to re-wire the X7 circuit and change and personalize several essential
design parameters to suit your personal playing style and tone. There are 6 Mod Switches
inside the X7 which are accessed by removing the bottom plate. Switches 1 & 2 on with
switches 3 & 4 off tune the midrange knob to eliminate feedback (detailed in the EQ section
below) Switches 1 & 2 off and 3 & 4 on tune the midrange filter to a normal midrange frequency of 1.5
kHz. Switch 5 selects the input impedancbetween 11 M when off or 1 M when on (detailed below in
the impedance section). Switch 6 is the bright switch. It lowers the tuning frequency of the treble filter.
On is the bright setting and off is the sweet setting.
Powering Up
There is a power source selection switch on the top of your X7 for selecting phantom, or
battery power. The highest performance is realized in the phantom power setting from the
extra voltage supplied. Phantom powering means you wont need to buy batteries at all, or at
least much less often than with similar products. And the X7 has no annoying wall wart
power supply.
The X7 uses two 9v batteries. Duracells are included, and recommended for use with all Archangel
preamps. The batteries are accessed by removing the bottom plate. Yes, we heard loud and clear when
our customers suggested a battery door to access the batteries. When they make one that we can
warranty for five years, we will include one in every preamp. Until then, removing 4 screws is necessary
to change the batteries. Battery life is estimated by our friends at Duracell to be 450 hours or longer.
This varies with your gain and eq settings. Unlike most preamps that are only 9V DC battery powered
and considered dead at 8 volts, the X7 is 18 volts on battery power and will play well even with the
batteries drained down to below 9 volts on the power rails. If you consider your performance to be
mission critical however, install fresh batteries whenever you change your strings.
The X7 can easily be powered with standard 48v DC phantom power supply. The X7 only draws 1.7mA
of current at maximum. If the phantom power supply from the mixer is substantially below 48 volts, or
the current supply is below the international standard of 10mA, please use the battery setting.
Note: The voltage and current of the phantom power supplied by the mixer can be seriously
affected from using very long cable runs, improper cables or termination, too many phantom
powered devices connected at once, shorted cables and connectors, and home brew XLR to 1/4
adapters. Mixers equipped with phantom power may have a different voltage rating from the standard
48v. Read the owners manual of any product connected to the X7 carefully before use.