Wyred 4 Sound STP-SE User manual

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 1 of 12
W
Wy yr re ed d 4 4 S So ou un nd d
OWNER’S MANUAL
_____________________________________________________________________
S
ST TP P- -S SE E
S
St te er re eo o P Pr re ea am mp pl li if fi ie er r
Get Wired, WYRED 4 SOUND

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 2 of 12
T A B L E O F C O N T E N T S
Warranty Registration 3
Unpacking 3
Introduction 3
Design features 4-5
Front panel operation 5
Powering your preamplifier 5
DC Trigger 5-6
HT Bypass 6
Getting connected 6
“Break-in”/ warming up Period 7
Troubleshooting 7
Got Hum? 7-8
Warranty coverage 8-9
Servicing your preamplifier 10-11
Product Specifications 12

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 3 of 12
W
Wa ar rr ra an nt ty y R Re eg gi is st tr ra at ti io on n
*
** *I IM MP PO OR RT TA AN NT T* ** *
P
Pl le ea as se e t ta ak ke e a a m mo om me en nt t t to o c co om mp pl le et te e t th he e w wa ar rr ra an nt ty y r re eg gi is st tr ra at ti io on n f fo or rm m l lo oc ca at te ed d o on n o ou ur r w we eb bs si it te e. . Y Yo ou u M MU US ST T
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co om mp pl le et te e a an nd d s su ub bm mi it t t th hi is s f fo or rm m w wi it th hi in n 3 30 0 d da ay ys s o of f p pu ur rc ch ha as se e t to o a ac ct ti iv va at te e y yo ou ur r w wa ar rr ra an nt ty y. .
U
Un np pa ac ck ki in ng g
The STP packaging contains:
1 – Owners Manual
1 – 6’ AC Power Cable
1 – 6’ DC Trigger Cable
1 – STP Stereo preamplifier
1 – Remote control
2 – AAA batteries
Carefully inspect your new preamplifier for any shipping damage. Please contact your dealer or Wyred 4 Sound
directly if you notice any shipping damage or for anything you suspect is missing from your shipment. All
packaging cartons will easily fold flat for convenient storage, and should be stored for future use should there be
one.
I
In nt tr ro od du uc ct ti io on n
Wyred 4 Sound products are a perfect example of what is accomplished when practical engineering and
knowledge are combined. All components are selected for the greatest possible functionality, durability, and most
importantly, the quality. Wyred 4 Sounds’ excellence in engineering will provide you with first-class performance
and years of satisfaction.
Wyred 4 Sound audio products are designed to bring you closer to the beauty of your music. Our goal is
to bring the performance of the recording right into your home with as little change as possible. As you can
identify, our drive is focused on the customer. We know what others have to offer, so you can be sure that our
value will be substantially more than theirs to keep the American made products desirable. We greatly appreciate
your purchase and expect your complete satisfaction. Wyred 4 Sound hopes that you will continue to grow with
us as we continue to provide the quality and functionality that you can learn to depend on.

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 4 of 12
D
De es si ig gn n F Fe ea at tu ur re es s
There are so many particulars that make the STP superior to other preamps. The best possible preamp
would be one that didn’t exist! We have created the closest anyone has ever come to that while still offering a fully
functional preamp. For the cleanest sound, what goes in should come out, nothing less, nothing more. For this
we’ve made our preamp passive and active at the same time. To keep the signal path clean as possible, the line
stage is automatically switched in when needed, and left out when not. This offers the quietest operation for any
level up to unity gain. Noise in the passive mode is <6uV, and <18uV in the active mode which is still incredibly
good. And yes, this product is fully balanced input to output.
When we say passive, we mean as in no gain. We all know that all passive preamps have many issues
regarding input and output impedances. These issues are massive because of the lack of drive current the preamp
is able to produce. The result is a loose, floppy bottom end, and a constricted, dry top end. To solve this, we
inserted our Ultra-transparent discrete buffer stages to address this issue, which proved to give us remarkable
results.
Like any audio electronic product, everything starts with a power supply. This is the first stage that gives
the STP unbelievably clean power. With a 25A Schottky bridge rectifier connected through 164,560+uF of
capacitance in our proprietary TRR (Triple-Ripple-Reduction) power supply circuit, the STP preamp has more
capacitance than some amplifiers! By the time power reserves supply the audio chain with power, there is no hint
of noise left to buzz through your speakers. Of course we left 2 stages of filtering up to nothing but the best; the
Nichicon Bi-polar MUSE audio grade capacitors do a fantastic job!
Our proprietary fully balanced dual FET unity gain buffers supply the meat behind the curtains. While
being sonically transparent, our buffers keep the input and output impedance right where we want them and don’t
allow for deviations like so many other passive preamps. Hand selected, matched and adjusted, each pair ensures
minimal DC offset, and maximum linearity.
Every preamp has to have a volume control. This is also a HUGE part in why our unit differs. The easy
route (practically everyone else takes) consists of putting audio in and out of a volume control chip. While being
cost effective and easy to design, the audio is left at the mercy the chip. The best possible electrical connection
that can be made and released on command is made by a switch. The best sounding switch is one that has the
least resistance and can maintain at all frequencies, for this we chose to use relays. While much more expensive,
slower and noisier when switching, they are far more sonically superior to any switcher chip on the market today.
The second part of our volume control is the resistors. That’s right, relays and resistors are the only
components interacting with the audio signal. Like all our other products, we use Dale rn55d copper leaded
precision resistors. Supplying exceedingly accurate channel to channel level matching (+/- 0.05db) and isolation
(>106db), our discrete volume control is the most transparent and spaciously sounding attenuator we’ve heard. A
maximum attenuation of 128db will quiet the loudest of sources, and as little as 0.5db steps allow for the finest
control.

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
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.
F
Fr ro on nt t p pa an ne el l o op pe er ra at ti io on n
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.
P
Po ow we er ri in ng g y yo ou ur r p pr re ea am mp pl li if fi ie er r
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.
D
Dc c t tr ri ig gg ge er r
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

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 6 of 12
other devices such as power amps. When the STP is on, the trigger outputs go high (+12V), when off they go low
(0V). If your unit locks up and doesn’t respond to anything, then chances are that the DC trigger input is applied,
but not assigned in the setup menu.
H
HT T- -b by yp pa as ss s
To properly set up the HT-Bypass feature you must complete the following. Make sure the unit is
powered up, but in the off position. Press in and hold the input up and down buttons while simultaneously
pressing the power button (volume knob). The display should come on in the setup menu. Press input up or
down until you find a screen that says “HT Bypass”. Once “HT Bypass” is selected, push the MUTE button.
This will select the HT Bypass mode, and allow for assignment. Now rotate the volume knob to turn HT Bypass
on and select the input desired for this operation. ((NOTE: Make sure you select the correct input in the set-up.
If the input is incorrect, and a signal is applied to that input when selected, the source will be playing VERY
LOUD.)) Now press the power button again to exit the set-up menu.
You can access the selected HT Bypass input any time by pressing the HT button on the remote, by
scrolling through the inputs on the front of the unit or on the remote, and also by using the remote trigger input.
Using the remote trigger input will automatically configure the preamp for use with an HT system, and also power
up connected amplifiers via the trigger outputs.
G
Ge et tt ti in ng g c co on nn ne ec ct te ed d
CAUTION: Disconnect the power cord or put the power switch in the off position before making any
connections to your preamplifier to minimize the risk of possible amplifier, and loudspeaker damage. Power up
your STP after all final connections have been made and checked.
The input and output connections you will find on the STP are made of nothing but the best. The RCA
(unbalanced) jacks are made with high quality gold plated copper, and should be properly connected with
interconnects of the same value. The Neutrik XLR (balanced) connectors are the finest balanced connector on
the market, and are the best possible option for connecting your amplifier to your preamplifier. When more
unbalanced inputs are needed, XLR to RCA adapters can be used. Please note that we don’t recommend using
the balanced outputs when using adapters on the inputs and not on the outputs. You should only use the adapters
when the unbalanced outputs are being used, and balanced outputs are connected with adapters. When using a
balanced input with an adapter, and balanced outputs, only half the signal will be present on the outputs because
the (-) phase on the input is shorted to ground through the adapter on the input of the preamp.
Using the new W4S power and interconnect cables would be a great way to ensure your system is closer to what
we call “our reference”. We are now offering superior cables at an affordable rate that anyone can afford. For
more information, please visit the web-site, or send an email to [e-mail] .

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 7 of 12
“
“B Br re ea ak k- -i in n” ” p pe er ri io od d
Your new preamplifier will deliver outstanding performance right out of the box. However, you should
plan on improvements as it reaches its normal operating temperature and once all of the components have a
chance to “settle in”. Our experience has shown that the STP has reached its’ potential after the initial 200 hours.
One will find that the initial 100hours, the unit will start to shed the initial “brightness” and somewhat harsh
transitions. During the second 100 hours, the preamplifier will start to become more fluid, and smoother overall.
Additional time is where the lesser of a change happens, and you will come to enjoy your new product for years to
come. After the initial break in period, your unit will be ready to perform when powered on.
T
Tr ro ou ub bl le es sh ho oo ot ti in ng g
No sound?
If you have your input source and speakers connected, and you can’t get music to play, check the following:
1. Verify that the power cord is plugged in and that the outlet is powered up.
2. Check the front panel and make sure that the display lights up.
3. If the display is on and there still isn’t any sound, adjust the volume. You should here some mechanical
noise of the relays clicking inside the unit. If you still don’t get sound when the volume is raised, make
sure the proper input is selected.
4. If you can hear the preamplifier turn on and off, but there still isn’t any sound, make sure you are
getting a signal to it.
5. Verify that the input is selecting the proper input for what you have connected.
6. If the input is in the proper position and still no sound, then try replacing the interconnects to verify the
connection between the preamplifier and source.
7. Verifiy that the interconnects are conducting by replacing them on a different set from a connection that
you know works.
8. Now that you have interconnects that you know work, try connecting the preamplifier to another source
that you know has worked in the past.
If you are still experiencing problems after checking all possibilities and using the resources provided please
contact your dealer or Wyred 4 Sound directly for further assistance.
G
Go ot t h hu um m? ?
Is there too much hum or hiss coming out of your speakers? If you put your ear right next to the tweeter
of your speaker, you should barely be able to hear any hiss in normal conditions, depending on amps. If the
noise is easily heard at a distance, try putting your source on mute, or pause. If this eliminates the noise, it’s
inherent in the source. If the noise is still there when the preamplifier is muted, try disconnecting the inputs to
the amplifier. If the noise is still there when the inputs are disconnected, and the inputs are shorted with shorting
plugs, then your amplifier may need some servicing. If the noise is not there when the inputs are disconnected,

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 8 of 12
try putting a cheater plug (ground isolator) on one or all components in order to eliminate a ground loop issue.
NOTE: We only recommend using a ground isolator for trouble shooting purposes, and should be removed after
the problem has been found. Having the ground of any unit disconnected can potentially create a dangerous
situation.
An easy way to locate a noisy component is to replicate the problem then start disconnecting components
one at a time, starting with a source. Digital cable boxes and satellite receivers are notorious for making ground
loop hum. This is normally caused by the potential difference on the input wire (shield side) for either of the
boxes when referenced to ground. If this is the case in your system, the installation of an isolating transformer
would be the easiest solution and are normally readily available at your local electronics parts store. A better
solution is a power strip with grounded and surge protected F-connectors that you can pass a signal through.
W
Wa ar rr ra an nt ty y c co ov ve er ra ag ge e
Wyred 4 Sound’s warranty obligations are limited to the terms set forth below:
Wyred 4 Sound, as defined below, warrants this Wyred 4 Sound-branded hardware product against
defects in materials and workmanship under normal use for a period of FIVE (5) YEARS from the date of retail
purchase by the original end user purchaser ("Warranty Period"). If the product has been transferred from the
original owner to a second hand owner it has a ONE (1) YEAR warranty, valid from the original date of purchase
by the original owner. The remote control is covered for warranty replacement in the first year. If a hardware defect
arises and a valid claim is received within the Warranty Period, at its option, Wyred 4 Sound will either (1) repair the hardware defect at
no charge, using new or refurbished replacement parts, or (2) exchange the product with a product that is new or which has been
manufactured from new or serviceable used parts and is at least functionally equivalent to the original product. Wyred 4 Sound may
option that you replace defective parts with new or refurbished user-installable parts that Wyred 4 Sound provides in fulfillment of its
warranty obligation. A replacement product or part, including a user-installable part that has been installed in accordance with
instructions provided by Wyred 4 Sound, assumes the remaining warranty of the original product or ninety (90) days from the date of
replacement or repair, whichever provides longer coverage for you. When a product or part is exchanged, any replacement item
becomes your property and the replaced item becomes Wyred 4 Sound's property. Parts provided by Wyred 4 Sound in fulfillment of
its warranty obligation must be used in products for which warranty service is claimed. When a refund is given, the product for which the
refund is provided must be returned to Wyred 4 Sound and becomes Wyred 4 Sound's property.
EXCLUSIONS AND LIMITATIONS
Wyred 4 Sound does not warrant that the operation of the product will be uninterrupted or error-free. Wyred 4 Sound is not
responsible for damage arising from failure to follow instructions relating to the product's use. This warranty does not apply: (a) to
damage caused by use with non-Wyred 4 Sound products; (b) to damage caused by accident, abuse, misuse, flood, fire, earthquake or
other external causes; (c) to damage caused by operating the product outside the permitted or intended uses described by Wyred 4
Sound; (d) to damage caused by service (including upgrades and expansions) performed by anyone who is not a representative of Wyred
4 Sound or a Wyred 4 Sound Authorized Service Provider; (e) to a product or part that has been modified to significantly alter
functionality or capability without the written permission of Wyred 4 Sound; (f) if any Wyred 4 Sound serial number has been removed
or defaced.
TO THE EXTENT PERMITTED BY LAW, THIS WARRANTY AND REMEDIES SET FORTH ABOVE ARE
EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, REMEDIES AND CONDITIONS, WHETHER ORAL OR

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 9 of 12
WRITTEN, STATUTORY, EXPRESS OR IMPLIED. AS PERMITTED BY APPLICABLE LAW, WYRED 4 SOUND
SPECIFICALLY DISCLAIMS ANY AND ALL STATUTORY OR IMPLIED WARRANTIES, INCLUDING, AND WITHOUT
LIMITATION, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND WARRANTIES
AGAINST HIDDEN OR LATENT DEFECTS. IF WYRED 4 SOUND CANNOT LAWFULLY DISCLAIM STATUTORY OR
IMPLIED WARRANTIES THEN TO THE EXTENT PERMITTED BY LAW, ALL SUCH WARRANTIES SHALL BE
LIMITED IN DURATION TO THE DURATION OF THIS EXPRESS WARRANTY AND TO REPAIR OR REPLACEMENT
SERVICE AS DETERMINED BY WYRED 4 SOUND IN ITS SOLE DISCRETION EXCEPT AS PROVIDED IN THIS
WARRANTY AND TO THE EXTENT PERMITTED BY LAW, WYRED 4 SOUND IS NOT RESPONSIBLE FOR DIRECT,
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY BREACH OF WARRANTY OR
CONDITION, OR UNDER ANY OTHER LEGAL THEORY, INCLUDING BUT NOT LIMITED TO LOSS OF USE; LOSS
OF REVENUE; LOSS OF ACTUAL OR ANTICIPATED PROFITS (INCLUDING LOSS OF PROFITS ON CONTRACTS);
LOSS OF THE USE OF MONEY; LOSS OF ANTICIPATED SAVINGS; LOSS OF BUSINESS; LOSS OF OPPORTUNITY;
LOSS OF GOODWILL; LOSS OF REPUTATION; LOSS OF, DAMAGE TO OR CORRUPTION OF DATA; OR ANY
INDIRECT OR CONSEQUENTIAL LOSS OR DAMAGE HOWSOEVER CAUSED INCLUDING THE REPLACEMENT OF
EQUIPMENT AND PROPERTY, ANY COSTS OF RECOVERING, PROGRAMMING, OR REPRODUCING ANY PROGRAM
OR DATA STORED OR USED WITH WYRED 4 SOUND PRODUCTS AND ANY FAILURE TO MAINTAIN THE
CONFIDENTIALITY OF DATA STORED ON THE PRODUCT. THE FOREGOING LIMITATION SHALL NOT APPLY
TO DEATH OR PERSONAL INJURY CLAIMS. WYRED 4 SOUND DISCLAIMS ANY REPRESENTATION THAT IT WILL
BE ABLE TO REPAIR ANY PRODUCT UNDER THIS WARRANTY.
O
Ob bt ta ai in ni in ng g w wa ar rr ra an nt ty y s se er rv vi ic ce e
Please access and review the resources referred to in the documentation accompanying this hardware product before
requesting warranty service. If the product is still not functioning properly after making use of these resources, please contact
the Wyred 4 Sound representatives or, if applicable, a Wyred 4 Sound Authorized Service Provider located using the
information provided in the documentation. A Wyred 4 Sound representative or Wyred 4 Sound Authorized Service
Provider will help determine whether your product requires service and, if it does, will inform you how Wyred 4 Sound will
provide it. Wyred 4 Sound or its Wyred 4 Sound Authorized Service Providers will provide warranty service on products
that are tendered or presented for service during the Warranty Period, as permitted by law. Wyred 4 Sound is not
responsible for freight charges to our facility for warranty repairs. We will cover return freight charges (domestic only) if the
unit is found to be faulty and still within the warranty coverage period. You will be responsible for delivery and return
shipping and handling charges if the product cannot be serviced in the country it is in. In accordance with applicable law,
Wyred 4 Sound may require that you furnish proof of purchase details and/or comply with registration requirements before
receiving warranty service. Please refer to the accompanying documentation for more details on this and other matters on
obtaining warranty service.
Recovery and reinstallation of system and application software and user data are not covered under this Limited Warranty.

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 10 of 12
S
Se er rv vi ic ce e
In the unlikely event there is a problem with your Wyred 4 Sound component, please contact your dealer,
distributor, or Wyred 4 Sound to discuss the problem before you return the component to our manufacturing
facilities for repair. Products shipped to the factory will be refused and returned freight collect if not accompanied
by a Wyred 4 Sound Service Department issued return authorization number (RA Number). Return
authorization numbers must be prominently displayed on the outside of the box and an accompanying letter
describing the problem and re-listing the RA number must be inside the box to qualify for service.
To contact the Wyred 4 Sound Service Department:
TELEPHONE [phone]
HOURS M/F 8:00 am to 5:00 pm PST
FAX [phone]
E-MAIL [email protected]
WEBSITE http://www.wyred4sound.com
If you are located in the United States use the following procedure:
1. Fill out the Service form at the following address and be sure to document all details:
http://www.wyred4sound.com/Service.html
2. If service is approved we will issue a Return Authorization Number (R/A number) from the Wyred 4 Sound
Service Department. Be sure to confirm the current shipping address.
3. Insure and accept all liability for loss or damage to the product during shipment to the W4S facility and ensure
all freight (shipping) charges are prepaid.
The product may also be hand delivered to the California facility if arrangements with the Service Department
have been made in advance. Proof of purchase from an authorized Wyred 4 Sound dealer, distributor or agent
will be required for warranty validation at the time of hand delivery. Use the original packaging to ensure the safe
transit of the product to the factory, dealer, or distributor. Wyred 4 Sound may, at its discretion, return a product
in new packaging and bill the owner for such packaging if the product received by Wyred 4 Sound was boxed in
nonstandard packaging or if the original packaging was so damaged to the point it was unusable. If Wyred 4
Sound determines that new packaging is required, the owner will be notified before the product is returned. To
purchase additional packaging, please contact your authorized Wyred 4 Sound dealer, distributor, or the Wyred 4
Sound Service Department for assistance.

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 11 of 12
S
Se er rv vi ic ce e p pr ro oc ce ed du ur re e
If you are located outside of the United States use the following procedure:
1. Obtain a Return Authorization Number (R/A number) and shipping address from your dealer or distributor’s
Service Department.
2. Insure and accept all liability for loss or damage to the product during shipment to the dealer or distributor’s
Service Department and ensure all freight (shipping) charges are prepaid.
If you feel your authorized dealer or distributor is either unwilling or unable to service your Wyred 4 Sound
products, please contact our service department at customersu[email protected]m or at the above contact
numbers to discuss and resolve the situation.
Voltage changes to match your country’s voltage and frequency requirements to your Wyred 4 Sound product are
possible only at the time of purchase. The STP series preamplifiers are set to a fixed voltage to match your
country’s requirements and may not be easily changed.
Your Wyred 4 Sound product serial number is:
Your dealer or distributor information:
Your purchase information:

_____________________________________________________________________
WYRED 4 SOUND ST Preamp v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: [phone]
[e-mail]
www.wyred4sound.com
©2013 WYRED 4 SOUND
All rights reserved. Page 12 of 12
S
ST TP P S Sp pe ec ci if fi ic ca at ti io on ns s
Typical Distortion
THD+N (20-20kHz / 2V)
<0.003% THD+N
Noise (A-weighted / VOL ≤ 63)
< 6 µV
Noise (A-weighted / VOL ≥ 64)
< 18 µV
Noise (20-20kHz / VOL ≤ 63)
< 9 µV
Noise (20-20kHz / VOL ≥ 64)
< 27 µV
Frequency Response
(20-20kHz / 2V)
+/- 0.02 db
Channel Tracking (All Steps)
< +/- 0.05 db
IMD
< 0.002%
Crosstalk (20-20kHz / VOL ≤ 63)
>106 db
Crosstalk (20-20kHz / VOL ≥ 64)
> 96 db
Output Impedance (VOL ≤ 63)
113 Ω
Output Impedance (VOL ≥ 64)
78 Ω
Input Impedance
60.4kΩ
Maximum Output Voltage
9V RMS
C
Ch he ec ck k o ou ut t t th he e l la at te es st t n ne ew ws s, , p pr ro od du uc ct ts s a an nd d s se er rv vi ic ce es s! !
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WY YR RE ED D 4 4 S SO OU UN ND D!
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