Pass Laboratories XP-12 Bedienungsanleitung

XP-12_om_10.17

PASSTM

XP-12 Owner’s Manual

XP-12_om_10.17

For your protection please read the following:

Water and moisture: Electrical devices should not be used near

water ( as per example, near a bathtub, washbasin, kitchen sink,

laundry tub, wet basement or swimming pool ). Care should be

taken such that objects do not have the opportunity to fall, and

that liquid is never spilled onto or into the device enclosure through

openings.

Power Sources: An electrical device must be connected to a

mains power source in strict accordance with the supplied product

owner’s manual. Please verify that the AC mains voltage specied

in the product manual matches those requirements indicated

on the unit and the AC voltage provided to your location by the

power company.

Grounding: Adequate precautions should be taken so that the

grounding provisions built into an electrical product are never

defeated.

Power Cords: Pass Laboratories provides a power supply cord

that meets all legislated requirements for the market in which the

product was originally sold. If you choose to substitute an after-

market product we urge you to choose one that is fully safety rated

by the necessary local authority.

Power Cord Protection: Power supply cords should be routed so

that they are not likely to be walked on, abraded, or pinched by

items placed on or against them, paying particular attention to

cords where they enter plugs or exit from a device. Never under

any circumstance insert a cut or damaged power cord into a

mains power socket.

Power and Signal: Cables should never be connected /

disconnected with equipment powered up. Failure to heed this

warning may damage or destroy equipment.

Ventilation: Power-ampliers run hot, but you should be able to

place your hands on them without discomfort. You must allow for

this heat in installation, by providing for free air circulation around

the product. Electronics should not be subjected to sources of

excessive radiant heat. Excessive heat can shorten the life of the

product and may cause the electronics to self-protect and shut

down.

Servicing: To reduce the risk of re, electrical shock or other injuries,

the user should not attempt to service the device beyond that

which is described in the operating instructions. All other servicing

must be referred to qualied service personnel.

XP-12_om_10.17

Introduction:

At Pass Labs we don’t change our products unless we feel that

the changes are signicant improvements over previous versions.

Because of this we see typical product life spans of seven to eight

years.

We are constantly working on and listening to new things and

increasing our knowledge of circuits and components on sound.

Eventually we nd some things worth putting into production

because they are signicant enough. That time has come with a

new series of preampliers.

The new XP-12 starts with a new power supply. It uses an efcient

toroidal design with both an electrostatic and Mu metal shield

along with vacuum impregnating and epoxy ll. This gives us a very

quiet transformer both electrically and mechanically.

The power supply circuitry itself is also lower noise and has

additional ltering, a little more complicated but worth it.

The XP-12 uses the single stage volume control borrowed from the

XS line preamp. This gives us one hundred 1 dB steps with lower

noise and distortion while removing some signal path parts.

The gain circuitry continues to use our favorite transistors from

Toshiba but has a larger higher biased output stage similar to the

XS preamplier auto bias. This makes longer and multiple cable runs

easier to drive and gives us the advantage of simplifying our single

ended output circuitry while increasing performance.

Overall this makes for a quieter more neutral, musical and versatile

control center for your system.

XP-12_om_10.17

Setup:

Please read and understand the operational instructions and safety

issues associated with this product. We go through great effort to

make a soundly engineered, and supurbly performing product of

lasting duribility.

We understand that things infrequently go wrong, if you have any

questions or problems please contact either your dealer or the

factory, we are here to support the product and you, the user.

As with all audio electronics the power cable should be the last

thing attached and the rst one removed any time you hook up or

remove equipment from the signal chain.

The preamplier’s voltage and current rating are indicated by

afxed tag on the rear of the preamplier. The preamplier

typically draws 30 watts during operation. Please verify that the

indicated voltage requirement of this preamplier is consistent with

the utility voltage at your location.

We have provided a standard IEC AC power cord that ts into

the IEC 320 line receptacle at the rear of the preamplier chassis.

The preamplier is equipped for operation with an earth ground

provided by the users AC outlet. Do not defeat this ground.

There are a total of ve inputs. Two of the ve inputs are balanced

XLR only. The other three inputs are single-ended only. There are

two pairs of outputs available with identical gain structure. One

pair Balanced, one pair single-ended.

Balanced inputs and outputs are via XLR connectors. Single-

ended inputs and outputs are via RCA connectors. On the XLR

connectors, pin 1 is grounded, pin 2 is the positive signal, and pin

3 is the negative signal. Left channel RCA connectors are marked

with “L”. Right channel RCA connectors are marked with “R”. In

a similar fashion balanced XLR inputs and outputs are marked with

“L” for left and “R” for right channel.

The main outputs are located at the left-hand side (viewed from

the rear) of the rear panel, two male XLR connectors, and two

RCA connectors, “R” (right) and “L” (left). The RCA connector’s

ground is in parallel with pin 1 of the XLR outputs and the RCA hot

is fed from an independent summing junction that maximizes the X

circuit benets. The RCA, single-ended, outputs are buffered from

the balanced outputs. You may use both the single ended and

balanced outputs at the same time. On the XLR, pin 1 is ground,

pin 2 is positive, and pin 3 is negative.

XP-12_om_10.17

Operation:

In use the XP-12’s front panel controls and alphanumeric display

are quite straight forward, and intuitive. We encourage you to

become familiar with their operation prior to establishing any input

connections with this unit.

After the all the inputs and outputs are connected and double

checked, you can now turn on the preamp by means of the power

switch located next to the AC inlet.

The left most button on the front panel is Mute. Pressing this button

toggles between mute on and mute off. Mute on removes signal

from the output of the preamp.

The front panel mode switch cycles the preamplier display through

2 different levels and off. These two functions are as follows:

Bright, Dim and Off. Using any functions with the display “off” will

momentarily bring the display back up to its dim setting.

The two Select switches (designated by left and right pointing

arrows) then alter the displayed active input, 1 through 5.

Input 5 is unique in that it is linked with the Home Theater (Unity

Gain) function. (The HOME THEATRE FUNCTION is discussed at

length later in this manual.) The two select arrows logically control

selections of the various inputs to the preamplier.

Before selecting the theatre pass through (pass thru) option, it is

imperative that the input device on input number 5 has its gain set

to minimum. Failure to follow this precaution could result

in a volume level intolerable to both ears and speakers. (The

standard 2 volt source component, with the pre-amp set to 0 dB,

will drive most power amps to full rated output.)

As an added precaution when “pass through” is selected the

volume ramps upto 89. This is to prevent nasty surprises when

“pass thru” is selected accidentally. The ramp up sequence can be

stopped at any time by hitting any button on the remote.

The theater pass through function bears special attention, this

function is only available as direct access through the hand held

remote control. This function is associated only with input number 5

and has two positions selected with the “pass thru” button

on the remote; those two positions, on and off. This function

is useful in that it allows the preamplier to function as a unity

buffer (0dB gain at volume step 89) for use with components that

best function with their own volume controls, such as surround

processors.

XP-12_om_10.17

When the right-front and left-front outputs of the processor are

routed through input 5 of the XP-12 (with the gain of the XP-12 set

for Unity), the volume will be under full control of the processor

and the XP-12’s action will be totally transparent. When the user

chooses this setting the software sets the XP-12’s gain to the unity

gain setting, regardless of how it was previously congured.

When at Unity both left and right level controls on the XP-12 will

have a displayed value of 89 (0 dB), You may also set any input to

unity (0 dB) by selecting low gain and setting the volume at step 89.

We have designed this product, so that the volume setting of the

preamplier will always revert to the values in the temporary register

as you exit from Pass Through. With the rarest of exceptions this is a

very safe transition, very infrequently will the normal chosen level be

higher than 0 dB.

The electronic volume control allows greater than 70 dB range

and is driven by a micro-controller that reads the optical encoder

serving as a front panel volume control. In this manner tracking of

the volume of the two balanced channels is possible with accuracy

unavailable on any ordinary volume control, assuring precise level

steps and high common mode rejection in balanced circuits.

Wayne Colburn’s exceptional volume control in conjunction with

the uorescent display gives the user ability to replicate volume

levels with absolute accuracy in steps of roughly 1 dB.

The remote control uses multi-button direct access architecture.

This remote is designed to operate several pieces of Pass Labs

electronics, not all of the functions available on this remote will be

applicable to your Pass Laboratories XP-12.

The Remote control operation is, or should be very intuitive in

operation; we have attempted to make its operation as familiar

as possible. Where applicable the remote mirrors the front panel

controls.

Power, tape and ext. amp on (external amplier turn-on) are not

used with the XP-12. These specic control functions are for other

products and have no effect on this product.

MUTE: pressing mute once will quiet the pre-amplier outputs;

pressing mute a second time will return you to the previous volume

control setting

INPUT SELECTION: Pressing. 1,2,3,4,5 will immediately move the input

selection to that input selection; volume and balance settings will

not be disturbed.

XP-12_om_10.17

BALANCE: Pressing balance left (<) or balance right (>) will increase

the level in the left or right speaker, depending upon which button

is pushed.

VOLUME: Pressing the increase (^) button or the decrease (v)

button will shift the volume setting 1dB, holding a button down will

increase or decrease the level until such time as you either release

pressure on the button or reach the limits of the volume control.

PASS THRU: Pushing this button twice, sets the pre-amplier to

volume step 89 (0 dB) and input 5. As an added precaution when

“pass through” is selected the volume ramps upto 89.

This is to prevent nasty surprises when “pass thru” is selected

accidentally. The ramp up sequence can be stopped at any time

by hitting any button on the remote.

The button must be pressed again to exit “Pass Thru” and unlock

the other command selections.

DISPLAY: The default setting for the display is “bright”, pressing

the display button once changes the display to its “dim” or “low

intensity” setting, pressing the button a second time selects “off”

for the display. When “off” is selected any other control function

will cause the display to indicate product operational status for

approximately 7 seconds and then the display will once again

blank. Pressing the display button a third time cycles back to a

“bright display”

We recommend the use of the balanced output mode where

possible. Balanced input to power-ampliers will typically retain the

character of the input mode, but offers less distortion, less noise,

more gain, and more voltage swing, without compromising the

sound.

With balanced operation, the common mode rejection of the

preamp reects the intrinsic common mode rejection of the

topology, the matching of the gain devices, and the matching of

the attenuator channels. In this case we have been able to keep

the total mismatch to about .1%, for a common mode rejection of

approximately -60 dB.

The input system of the preamplier will exhibit full common

mode noise rejection with passive balanced sources, where the

negative input is connected to ground at the source through

the appropriate source impedance. This allows adaptation of

unbalanced sources to balanced operation with passive cable

connections in a manner that achieves the noise rejection of active

balanced sources.

XP-12_om_10.17

The use of a micro-controller allows all of the preamplier functions

to be repeatable and accurately controlled. The micro processor

only controls the functions of the preamplier. At no time does

any of the input or output signal come into contact with the digital

control signals. The digital circuits are powered by a power supply

that is isolated from the analog supply. Should it ever be necessary

to update the software that controls the functioning of the preamp

only the socketed micro processor need be changed.

Muting relays, which delay connection during turn-on and shut

off the output when insufcient power supply is available to

maintain regulation, guard the output of the preamplier and offer

protection to the power-amplier and loudspeakers.

XP-12 Specs:

Power consumption 30 Watts

Gain 9.3dB Balanced

Frequency response: +/- 0.05 dB 10Hz to 20KHz

-1dB @ 100KHz

Crosstalk > 100dB

Residual Noise 15uV 10 – 30Khz

THD < 0.001 @ 1V 1Khz

Dimensions: 17”w x 12.5”d x 4”h

Weight: 20lbs

XP-12_om_10.17

Warranty Information

We go through great effort to make a soundly engineered, and

supurbly performing product of lasting duribility. But we also

understand that things infrequently go wrong, if you have any

questions or problems please contact either your dealer or the

factory, we are here to support the product and you, the user.

All Pass Laboratories products purchased new from an authorized

Pass Laboratories dealer in North America are covered by a

transferable, limited 3-year warranty. This warranty includes all parts

and labor charges incurred at the factory or factory specied

repair facility, exclusive of any subsequent or consequential

damages. Damage due to physical abuse is specically excluded

under this warranty.

For this warranty to apply the customer is responsible for returning

the product unmodied to the factory within the specied warranty

period. The customer assumes all responsibility for shipping and

insurance to and from the factory or a factory specied repair

facility. The conditions and stipulations of this Pass Laboratories

warranty only applies to units originally sold new through an

authorized dealer. Warranty on factory repair is 60 days and covers

only the scope of the original repair.

Non-North America customers should consult with their original

Pass Labs dealer or distributor for warranty repair instruction prior to

contacting the factory or shipping product to the factory for repair.

Non-North American product must be returned to the country of

origin for warranty service. Foreign distributors are only required to

offer warranty service on Pass Laboratories product that they have

imported, veriable by serial number.

Please note: Conditions of warranty service and customer rights for

product purchased outside the United States may vary depending

upon the distributor and local laws. Please check with your local

distributor for specic rights and details.

Any modications to Pass Laboratories products that have not

received written factory approval nullify all claims and void all

provisions of the warranty and liability by the maker or authorized

distributor. Should a modied product be returned to the factory

for repair the owner will be required to pay all necessary charges

for the repair in addition to those charges required to return the

product to it’s original conguration.

In the case of safety issues, no product shall be returned to the

customer without those safety issues being corrected to the most

recent accepted standards.

Removal or alteration of original Pass Labs serial numbers voids the

factory warranty. Product with altered or missing serial numbers will

be suspect as counterfeit or stolen product.

XP-12_om_10.17

Pass Laboratories will not repair or in any way indemnify any

counterfeit or cloned product. Pass Laboratories does not offer

products in voltages intended for international markets either to

authorized Pass Labs dealers or to third parties located in the United

States or Canada.

For more information please contact: Pass Laboratories Inc.

“Pass”, “PASS”, “Pass Labs”, “Pass Laboratories”, Supersymmetery”,

“Aleph”, and “Zen” and are all registered trademarks of Pass

Laboratories, Inc., and all rights thereto are protected by law.

PASS®

Pass Laboratories Inc., 13395 New Airport Rd., Suite G, Auburn, CA 95602

voice: 530.878.5350 - fax: 530.878.5358 - web: passlabs.com

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