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Installation
The ART Solo MPA may be used in a wide variety of applications and environments. In a rack-mountable, all-steel en-
closure, the unit is designed for continuous professional use. Mounting location is not critical, however for greater perfor-
mance reliability we recommend that you not place the unit on top of power amps, or other sources of heat and/or strong
magnetic fields. The tube circuitry needs about a minute to "warm up" and stabilize from a cold power up.
AC Power Hookup
The Solo MPA has an internal power supply designed to operate from 100/120V~ or 220/240V~, 50/60Hz 25W. Units
manufactured for use outside of North America have been modified to comply with the required electrical specifications.
Under no circumstances should the power cable be altered. If the cable becomes cut or damaged, discontinue its use and
have it replaced before operating the Solo MPA.
The power source must provide a good ground connection, and the ground pin on the mains plug should never be defeated.
Audio Connections
Audio connections to and from the Solo MPA are:
CONNECTIONS
Unbalanced 1/4-inch cables may be used with no damage to the Solo MPA. We recommend using only high-quality
cables equipped with the appropriate connectors.
1
2
3
GAIN
POWER
+9
INSTRUMENT
SOLO MPA
SOLO MPA
M U LT I VO I C E T U B E P R E A M P L I F I E R
0
(High Z)
dB
mic/inst
Front Panel
1. Power Switch
The Power switch turns the power on and off to the unit. The Solo MPA should be turned "on" with all monitor levels turned
down to protect against any "thumping" caused by power up. Likewise, the Solo MPA should be turned "off" after turning
all monitor levels down.
When the Power switch is turned on, the VU meters will light. Switch LED's will light if its associated switch is in the "in"
position. Power on the Solo MPA before any monitoring outputs or power amps are turned on.
Like all tube-based equipment, the Solo MPA needs to warm up to operating temperature. The 12AX7 tube will reach operating
temperature within one to three minutes. During this warm-up period you may experience sound variations due to the bias of
the tubes stabilizing. This is normal and the Solo MPA will provide consistent results once the warm-up period is over.
If the Solo MPA fails to power up when the POWER switch is turned on, check to see that its power cord is plugged into
an active outlet. Locate the fuse installed in the IEC connecter, verify that the fuse is not blown, replace if blown with the
same type and value fuse. If the unit still fails to operate properly, turn it off and unplug it. Then consult your dealer or the
ART Customer Service Department.
2. Instrument Input
The ¼-inch jack on the front panel serves as an instrument input. The input impedance is always >1M ohm and the gain
can be adjusted by the Input gain control. The maximum input signal level is +17dBu (5V RMS) @ minimum input gain.
When you plug into this jack it DISABLES the balanced input on the rear of the unit. This feature allows you to keep the
rear input patched in, and use the instrument input to switch to a different source. The instrument input allows the Solo
MPA to serve as a great DI device as well.
XLR
PIN 1 = GROUND
INPUT
PIN 2 = (+ + ) HOT
OUTPUT
PIN 3 = (-) COLD
4
5
6
IMPEDANCE
LOW CUT
TILT EQ
15k
70
0
+20
+40
600
80k
10
200
ohms
Hz
1/4-INCH T.R.S.
TIP
= (+ + ) HOT
RING = (-) COLD
SLEEVE = GROUND
7
11
VOICE
GAIN
PHANTOM
PHASE
+20dB
+48V
INVERT
SOLID
TUBE
NORMAL
OFF
NORMAL
STATE
8
9
10
12
13
MASTER OUTPUT
-5
+5
APPLIED RESEARCH AND TECHNOLOGY
-
+15
dB
3
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