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WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: 805-462-8962
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved.
Page 5 of 12
With 2 sets of balanced inputs/outputs, 3 sets of unbalanced inputs and 2 sets unbalanced outputs,
connection possibilities are vast. Being fully balanced input to output; the phase going in comes out. When an
unbalanced input is selected, an inversion circuit is connected to maintain balanced outputs and optimum
versatility. Absolute phase and balance control are easily selected through the supplied remote for those out of
phase recordings, and room adjustments to be made on the fly.
User interface is made easy with the VFD display and optical rotary encoder. Allowing input naming and
HT Bypass input selection, the setup menu is easily accessed for customization. Several display dimming steps
including “off” are available through the remote for stealth operation. Powering up the STP can be done several
ways, by pushing in on the volume knob (power button), by pressing power on the remote, or by the remote DC
trigger input when HT Bypass is selected in the setup menu. When an input is selected to be used as the HT
input, the DC trigger can be activated by a surround processor to “power up” the unit, and automatically set the
volume to unity gain. This allows for all volume controls to be made through the surround processor. When the
processor is shut down, so is the STP and connected gear through the DC trigger output. When 2ch listening is
desired, then manual operation can be executed from the front of the unit, or through the remote.
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The front of the STP offers several features, power on/off, input selection, volume control, muting, setup
routine, and a display for user feedback. For phase, balance, and dim control, the remote must be used. To
enter the setup mode, input up and down must be pressed in while the power is turned on by pushing in the
volume knob. Once in the setup menu, input up/down is used to scroll through the settings, mute is used to
select the setting for adjustment, and the volume knob is used to adjust the setting. For input naming, the volume
control will be used to select the character, and the mute button to move to the next character position for
adjustment. Once all settings are made (automatically saved once changed), the setup menu can be closed by
pressing the power button (volume knob) again at any time.
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When power is applied to the unit and the switch located on the rear is in the on position, the STP is
ready to be powered up. If you would like to manually disconnect the power from the unit, the switch on the rear
is where you would want to do so. To prevent power surges, we recommend using quality surge suppressor
equipment. Turning the switch off on the rear of the unit will also protect against surges and spikes should some
occur without proper protection.
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The STP stereo preamplifiers are equipped with a 12Vdc remote trigger input and two outputs. You can
connect the 12V trigger output of your surround processor to the 12V trigger input on the preamplifier for an HT
Bypass configuration when proper input is selected in the set-up menu. When the unit is activated by the remote
trigger input, it will automatically connect the HT Bypass input and set the volume to unity gain (-0 db). When
the unit is in standby via the remote trigger, the STP turns off. The trigger outputs are simply there to power
