Tech 21 Musical Instrument Amplifier Acoustic DI User Manual

POWER REQUIREMENTS  
*Operable with phantom power supply, minimum 24V DC, however, 48V DC,  
is recommended.  
*Utilizes standard 9V alkaline battery (not included). NOTE:The Input jack  
activates battery.To conserve energy, unplug when not in use.  
Power Consumption: approx. 7mA.  
*USE DC POWER SUPPLY ONLY! Failure to do so may damage the  
unit and void warranty. DC Power Supply Specifications:  
-9V DC regulated or unregulated, 100mA minimum;  
-2.1mm female plug, center negative (-).  
Optional factory power supply is available:Tech 21 Model #DC2.  
WARNINGS:  
* Attempting to repair unit is not recommended and may void warranty.  
* Missing or altered serial numbers automatically void warranty. For your own  
protection: be sure serial number labels on the unit’s back plate and exterior  
box are intact, and return your warranty registration card.  
ONEYEAR LIMITED WARRANTY. PROOF OF PURCHASE  
REQUIRED. Manufacturer warrants unit to be free from defects in materials  
and workmanship for one (1) year from date of purchase.This warranty does  
not include damage resulting from accident, misuse, abuse, alteration, or incor-  
rect current or voltage. If unit becomes defective within warranty period,Tech  
21 will elect to repair or replace it free of charge.After warranty expires,Tech  
21 will repair defective unit for a fee.  
ALL REPAIRS for residents of U.S. and Canada: Call Tech 21 for Return  
Authorization Number. Manufacturer will not accept packages without  
prior authorization, pre-paid freight (UPS preferred) and proper insurance.  
FOR PERSONAL ASSISTANCE & SERVICE:  
Contact Tech 21, Inc., any weekday from 10:00 AM to 6:00 PM, EST.  
MADE IN THE U.S.A.  
.
TECH 21 NYC  
333 West 52nd Street, NY, New York 10019  
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THE INS AND OUTS.  
ACTIVE SWITCH: Active, LED will be on.All controls will respond to  
their settings. Inactive, LED will be off and SansAmp Acoustic DI is in bypass  
mode. It then functions as a transparent direct box and will not sonically  
alter the instrument signal.  
TURN ON FIRST. TURN OFF LAST. To avoid unwanted and  
potentially speaker-damaging “pops” when connecting or disconnecting any  
equipment, follow Standard Audio Procedures: Always mute mixing board  
and/or turn down amp volume before plugging or unplugging !  
INPUT: 1/4”, 4.7megOhm, instrument level.The unusually high impedance  
was designed with piezo pickups in mind to provide maximum output and  
dynamics. Switches battery power on/off.To avoid battery drain, unplug when  
unit is not in use. AND... DON’T FORGETTO MUTE !  
-20dB PAD: Attenuates the volume of the XLR Output between 0 and  
-20dB. If you’re using a mixer with a mic level input, be sure to pad at -20dB so  
as not to overdrive the input.To obtain a better signal to noise ratio, use the  
0dB position. Just be sure your mixer can accept a line level (0dB) signal input  
(not all can).  
INPUTTO XLR/“Effect Return:” This triple-function 1/4” input con-  
verts a high impedance instrument signal to a low impedance, balanced line  
through the XLR Output.This input bypasses all the circuitry, which enables the  
unit to be used as a standard transparent DI.You can also create an effect loop  
by utilizing this input as an “Effect Return” in conjunction with the 1/4” Output.  
See illustration below.  
PHANTOM & GROUND CONNECT SWITCH: When  
engaged, the ground connects, and unit will accept phantom power through the  
XLR Output. Disengaged, the ground of your stage system and other  
interconnected gear is lifted (isolated) from the ground of the mixing console.  
1/4” OUTPUT/“Effect Send:” Unbalanced low Z output. Sends signal  
to your amp or power amp. It can also be used with a home recorder should  
an XLR input not be available.Also functions as an “Effects Send” when  
utilized in conjunction with the Input to XLR. See illustration below.  
PHANTOM POWER OPERABILITY eliminates the need  
for an external power supply. If you are using a suitably equipped  
mixer, consult its owner’s manual for set-up instructions. For live  
and studio use, let the engineer know your SansAmp Acoustic DI  
is phantom power operable.  
BALANCED XLR OUTPUT: Balanced low Z output sends signal to  
mixing console/recorder. Switchable between 0 and -20dB by using the -20 dB  
Pad switch.Also accepts phantom power (see page 4).  
NOTE: When lifting the ground, phantom power disconnects,  
and battery (if installed) becomes activated.While operating  
under phantom power, we recommend keeping a 9V alkaline  
battery installed at all times to avoid the previously mentioned  
“pops” when lifting the ground (see page 3).  
EFFECT LOOP HOOK-UP:  
OUTPUT  
INPUT  
TO  
OUTPUT  
INPUT  
CHORUS  
TM  
INPUT TO XLR  
MIXER  
XLR  
OUTPUT  
4
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GUIDE TO CONTROLS  
NOTEWORTHY NOTES & CONSIDERATIONS  
BASS &TREBLE  
1) SansAmp Acoustic DI is very responsive. Our controls are unusually  
sensitive and you need not set everything at max to get maximum results. For  
instance, to brighten your sound, restrain yourself from automatically boosting  
Treble all the way up.Try cutting back on the Bass first.  
Unlike passive controls that can only cut, these active tone controls cut or  
boost 12dB from unity gain at 12 o’clock.  
MID SHIFT & MID  
Be aware that boosting Treble and Bass increases the high and low frequency  
content without changing the gain structure. However, boosting the Mid and  
the Mid Shift controls will increase the amount of saturation. (Refer to the  
Sample Setting for Electric Guitar.) By taking the time to familiarize yourself  
with how the EQ controls interact, you will be able to achieve the proper mix  
of frequencies that best suits your needs in any venue.  
These sweepable, semi-parametric EQ controls range from 170 Hz to 3.5 kHz,  
16dB, respectively.With the Mid Shift control, you can select the center fre-  
quency of the mid-range control (MID).This, in turn, enables you to notch out  
any specific frequencies that may be causing your guitar to feed back. To find  
the feedback frequency of your guitar, set MID at maximum boost (5  
o’clock).Turn Mid Shift to the feedback point and leave it there.Then cut the  
MID control until the feedback stops.  
2) The noise level of SansAmp Acoustic DI is exceptionally low.  
However, it may amplify noise emanating from the input source.To minimize  
noise going into SansAmp Acoustic DI, we recommend active electronic instru-  
ments have the volume set at unity gain/maximum and tone controls posi-  
tioned flat. If you need to boost, do so slowly and sparingly.  
If you set Mid Shift at 1kHz, Mid operates as a traditional mid-range control.  
BLEND  
Allows you to blend the direct instrument signal with SansAmp Tube/Micro-  
phone Emulation circuitry. In most cases, you will probably have this set at max-  
imum (100% SansAmp). If you should want to hear some of the distinct timbre  
of a piezo pickup, or reduce the amount of “compression,” you can  
simply adjust accordingly by turning the Blend control counter clockwise.  
At minimum, the SansAmp circuitry is bypassed. However, all the other controls  
remain active.The unit then functions as a standard DI with EQ.  
3) Compressors or limiters may not be necessary. Our unique  
circuitry emulates the warm, natural, gentle compression of tubes.This limits  
transient peaks for an even meter reading, so that outboard units typically  
aren’t needed.  
4) Using effects. One of the key attributes of SansAmp is the responsive-  
ness to the dynamics and nuances of your playing technique.Therefore, your  
guitar should be plugged directly into SansAmp and effects should be placed  
after SansAmp.  
LEVEL  
Adjusts the output level.  
TUBE/MIC EMULATION  
With an amp: use 1/4” Output to effect to amp.  
Tube/Microphone Emulation is an integral part of the SansAmp Acoustic DI’s  
circuitry.The tube emulation yields a warm, gentle saturation to limit dynamic  
peaks, while the microphone emulation removes the unnatural harmonics  
associated with piezo pickups. It is specifically engineered to yield a smooth,  
even response as would be achieved by a properly miked acoustic guitar.  
With XLR: place effect in effect loop of SansAmp Acoustic DI  
(see page 3).  
If, however, you prefer to place an effect before SansAmp, be sure to set the  
output level of the effect at unity gain with the output level of the instrument.  
5
6
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SAMPLE SETTINGS  
SAMPLE SETTINGS  
(for acoustic guitars)  
(other)  
FOLK  
BASS GUITAR  
COUNTRY  
BASS GUITAR  
(hard driven)  
FINGER PICKING  
ELECTRIC GUITAR  
(semi dirty)  
JAZZ  
SPEAKER/MIC  
SIMULATOR  
NOTE: Sample settings are provided as a starting point. As acoustic guitar  
designs vary greatly, controls may have to be adjusted accordingly.  
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CUSTOM SETTINGS  
CUSTOM SETTINGS  
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