Operation; Power; Preamp; Inputs - Acoustic Image ten2 Owner's Manual

Operation

Power

CAUTION: TO REDUCE THE Power
RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
Switch
NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
CAUTION: TO REDUCE THE
RISK OF FIRE, REPLACE FUSE
WITH THE SAME TYPE 8A FAST Voltage Switch
BLOW FUSE (F 8A H 250V)
115/230V
Fuse
Ten2 Rear Panel (shown in docking position)
Plug the detachable AC power cord into the receptacle on the back of the amp
and into a wall receptacle. A power switch next to the AC connector turns on
power to the pre- and power amps, illuminating a "power on" indicator on the
front panel of the amp. An 8-amp fast blow fuse is mounted on the back panel.
To replace the fuse, turn off the amp, remove the AC cord and use a small
screwdriver to remove the fuse from the fuse holder. A spare fuse is included
with this manual. The Ten2 will work with either 115 volt, 60 Hz AC or 230 volt,
50 Hz AC power. A switch located on the rear panel selects the appropriate
voltage. Note that the correct AC power cord must be used for connection to
the appropriate wall plug. If you do not have the right cord, you can buy one
from an electronics or computer store. Be sure the switch is in the correct
position for the intended application. Operation at 230 volts with the switch
in the 115 volt position will damage the unit.
Please note that units sold in Japan operate at 100 volts only. The above
mentioned voltage switch is not available for these units.
volt amp at any other voltage than 100 volts will damage the unit.

Preamp

Refer to the signal flow diagram and the control panel drawing for more
information (page 5).

Inputs

The Ten2 uses combo jacks for the input to each channel of its preamp. Either
an XLR or 1/4 inch connector can be plugged into this type of jack. The 1/4 inch
input has a 1 megohm input impedance that is optimized to get the best sound
from piezo pickups. The XLR input is a low impedance balanced input with
sufficient gain to allow microphones to be plugged into it. A switchable 10 dB
pad is provided to attenuate the output of microphones that are too "hot" for the
mic input. Phantom power is available through the connector for powering a
mic or outboard preamp and can be activated using the push button switch
located next to the connector. To avoid an audible "pop", set the mic input level
control all the way off when switching on the phantom power. An LED indicates
when phantom power is on. The two channels of the
to mix two instruments, 2 microphones or a mic and an instrument thereby
performing much like a small PA system.
2
W
Speaker Output 2 min
AC Input
115/230 V ~
50/60 Hz
900 Watts
Headphone
Output
Operation of a 100
Ten2 combo can blended

Controls

The preamp has the following controls in each channel: input level, bass, mid,
treble and effects level. In addition, there is a variable frequency, selectable
low cut filter and a phase reverse switch in each channel and a master level
control that affects both channels.
Level
The input level controls the level of the signal at the input stage of the preamp.
The master volume controls the level of the signal at the output of the preamp
(at the input of the power amp). Set the master control at "12 o'clock" and the
input level at zero. The input level should then be used to control the overall
output of the unit. The two controls are provided to allow independent control of
"house" volume and "stage" volume when the unit is used as a stage monitor
with a connection to a house PA. See the discussion under "Direct Out" below.
The maximum volume at which the system will play is limited by the capability
of the speaker system. If more volume is needed, use a Ten2 EX extension
cabinet or take a feed from the Direct Out jack to a PA system or another
amplifier.
Tone
Each tone control has a center detent at the flat position. Experiment with
settings to achieve the frequency balance that sounds best to you. In general,
small values of boost and cut are best. The amp is designed with flat frequency
response so only minor corrections should be required to compensate for room
effects or "peaky" pickups in order to maintain the balanced response desired
for acoustic instrument amplification. To minimize electronic noise, avoid
operating all controls simultaneously at their maximum settings.
The bass control is a shelving-type that affects frequencies below 250 Hz and
with a maximum boost/cut of 15 dB. The mid control affects frequencies
between 300 Hz and 2000 Hz and has a maximum boost/cut of 15 dB. The
treble control is also a shelving-type that affects frequencies above 1000 Hz
with a maximum boost/cut of 15 dB.

Low Cut Filter/Phase Reverse

The low cut filter is a variable frequency type that inserts a 12 dB per octave
rolloff at frequencies between 30 and 400 Hz, depending on the position of the
control. Approximate frequency settings are noted on the frequency control.
Note that the first half of the control's rotation affects frequencies from 30 to 60
Hz, the last half of the rotation affects frequencies between 70 and 400 Hz. This
is done so that there is plenty of control in the critical low frequency range.
low cut filter is used to reduce the bass output in cases where room location or
instrument/pickup combination results in "boomy" sound. Depress the on/off switch
to enable the filter. Start with the control fully counterclockwise and gradually turn it
clockwise until the desired effect is achieved. Experiment with the position of the
control to give you the sound you like best.
The phase reverse switch is used to reduce feedback and to control interactions
between the two channels. If you are using two pickups or a mic and a pickup, you
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