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®
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Multi-Source
™
Pickup and Microphone System
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| Installation Instructions
Information in this document is subject to change without notice.
© 2009 D-TAR. All right reserved
January 2009
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The Wavelength Multi-Source is a sensing and
amplification system for acoustic guitar that blends an
under-the-saddle pickup with a microphone. The pickup
is a unitary design, constructed using a single layer of a
piezoelectric co-polymer. 100% coverage copper shielding
on the pickup insures immunity to external noise fields
and quiet operation. The microphone is a miniature, omnidirectional electret condenser selected for linear response
and exceptional sonic quality.
A lightweight Control Module, discreetly mounted just
inside the sound hole, allows fingertip control of the
pickup-to-mic mix ratio. Two low-profile potentiometers are
utilized; one for the microphone level and one for master
volume. The Control Module also serves as the anchor
point for the microphone which is shock mounted using
a special absorptive visco-elastic polymer. This feature
isolates the mic from undesirable vibration and handling
noise; providing detailed, transparent sound quality.
Introduction I Multi-Source
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| Installation Instructions
The supporting electronic package is made up of discrete
hybrid circuitry, utilizing low noise field-effect transistors
configured for class A operation. It provides exceptionally
low noise, low distortion, low output impedance, high
headroom and long battery life. Two internal adjustable
trim pots are provided that allow up to 9dB of bass or
treble boost on the pickup channel. The bass control can
be used to highlight the body resonance and warm up
the sound while the treble control can add brilliance and
clarity and allow the player to cut through a stage mix. The
microphone channel has a two stage frequency roll-off
applied to combat any tendency towards low frequency
feedback. Finally, for those wishing to customize their
system, there is a user-configurable jumper on the PCB
that allows the system to be configured for stereo output;
assigning the mic to the “Ring” connection and the pickup
to the “Tip” connection of the output jack.
The preamp is fully enclosed in a lightweight, anodized
aluminum shell giving high immunity to hum and noise.
The preamp is directly connected to a special TRS stereo
endpin jack equipped with an additional sleeve connection
to accommodate switching of the battery ground. The
entire unit is powered by a proprietary voltage boost circuit
that produces high headroom 18 Volts from two compact
AA batteries.
Introduction I Multi-Source
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To reconfigure the Wave-Length Multi-Source for
stereo output, follow these steps:
1. Look inside the guitar and find the cable clamps
that secure the pickup lead wire, battery wires and Control
Module cables going to the preamp chassis. Loosen only
the cable clamps necessary to allow the preamp chassis
to be moved as far as the sound hole. Do not attempt to
remove the adhesive backed clamps from the guitar; you
only need to un-bend them slightly so the cable cables
can be moved.
2. Remove the strap button and outer nut and washer from
the endpin jack. Keep this hardware in a safe place so you
will not lose it.
3. Carefully slide the endpin/chassis assembly free from the
end block of the guitar and move it into view from the
sound hole. Do not apply any stress to the any of the cable
attached to the preamp, especially the pickup cable.
4. Remove the two small screws that secure the chassis top
to the sides. Put the top and screws with the other
hardware.
5. Refer to figure 1 (on page 6). If you have the original style
product, it will be necessary to cut or remove the small
wire jumper indicated and resolder a jumper from the center
connection point to the left connection point. If you have the
Converting the output signal to stereo operation
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| Installation Instructions
new style, you can simply remove the shunt plug and
re-insert it so that it covers the center and left pins of
the header.
6. Re-attach the chassis top, being sure to align the
holes in the top with the potentiometer inside. Re install the preamp in the endpin hole and tighten
the nut and strap button securely. Secure the
cables back inside the cable clamps so they cannot
rattle against the inside of the guitar.
Figure 1 - Original Style
Figure 2 - New Style
Jumper
Shunt Plug
Converting the output signal to stereo operation
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Specifications:
Power supply voltage to circuit - 18 Vdc
Batteries required - 2 ea. AA
Current consumption - 11.0 mA @ 3Vdc
Battery life - Min. 200 hours using
fresh alkaline batteries
Maximum signal swing, @ onset of clip - 5.7V RMS
Frequency response, pickup channel - -3dB @ <20 Hz, 30 KHz
microphone channel - -3db @ 580 Hz, 100 KHz
Gain pickup channel - -8dB (
all controls set flat)
microphone channel - -2.5dB
Thd 1V out, 1 KHz - <.005%
1V out, 20 Hz to 20 KHz - <.03%
Noise, ref. To input: Wideband - -105dBV
A weighted - -112dBV
Control function, internal bass trim pot
- Broadband boost, 0 to 10db @ 40 Hz (pickup channel only)
Control function, internal treble trim pot
- Broadband boost, 0 to 9db @ 5.0 KHz (pickup channel only)
Control function, external Control Module
- Microphone volume, Master volume
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| Installation Instructions
5427 hollister ave. santa barbara ca 93111
tel 805.964.9610 fax 805. 9649749
© 2009 D-TAR. All right reserved
®
www.dtar.com
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