Pass Laboratories XP-10 Manuel utilisateur

November 18, 2010 Rev 1.02 1

PASS®

XP-10 Owner’s Manual

November 18, 2010 Rev 1.02 2

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 specified 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-amplifiers 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 fire, 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 qualified service personnel.

November 18, 2010 Rev 1.02 3

Introduction

The XP-10 is an ultra high quality line-stage audio preamplifier

featuring remote control and internal power supply. The XP-10

minimizes the number of components in the signal path, and yet

retains exemplary objective performance specifications. It pushes the

state of the art by exploring how much subjective quality is obtainable

with unique circuit elements applied in innovative ways.

The Pass Laboratories XP-10 along with the XP-20 pre-amplifiers are

the natural descendants to the highly acclaimed and successful X

series of Pass Laboratories line-stages represented by models X0.2,

X1 and X2.5.

The X series pre-amplifiers have received many highly respected and

well-deserved accolades over the past 11 years…. justifiably so. More

importantly they have provided a solid foundation from which the

current and newest product has evolved.

These new pre-amp offerings from Pass Laboratories objectively

sound and measure significantly better than their immediate

predecessors.

The new XP series pre-amplifiers are more true to state of the art

recordings than our previous line level product. Given quality

recordings, these pre-amplifiers sound more dynamic, bass lines are

more clearly, cleanly, and accurately delineated, helping eliminate un-

necessary one note bass; instruments and voice are presented in a

more refined spatial envelope, and with better spectral balance.

November 18, 2010 Rev 1.02 4

Fine nuances and details, which frequently have gone un-noticed, now

become apparent -- even in loud and highly complex musical

passages.

The simple truth is that a decade of knowledge and experience gained,

coupled with new component technology, has enabled both enhanced

performance and listening satisfaction over the building blocks we had

available when the original X series pre-amplifiers came to market.

Pass Laboratories has not been shy about taking advantage of these

circuit innovations and new components in these new pre-amplifiers.

You will hear, and appreciate, these significant sonic improvements as

you experience the XP series product.

Collectively, audiophiles tend to listen quite a bit differently today, than

they did when the original X preamps were created, and the XP line of

product have all been designed to reflect those changes in listening

style.

Pass Laboratories has redesigned the remote control to allow direct

access to the most frequently wanted control functions, thus simplifying

and enhancing product operation. The new remote control codes have

been carefully selected to minimize the impact on other remote

controlled electronic devices, allowing for more carefree product

placement.

Volume control steps on the new pre-amplifiers are more numerous

and generally of smaller increments, giving the listener a wider choice

of listening levels to better accommodate the wildly-fluctuating levels of

current, verses legacy, recordings.

November 18, 2010 Rev 1.02 5

Changing lifestyles dictate that many audiophiles now share family

space where music may be an adjunct to other activities. To better

serve the needs of these listeners, these new pre-amplifiers allow for

significantly more precise volume steps and greater attenuation at the

very lowest volume levels.

So that these very low-volume listening levels have real world

practicality, the noise floor and very fine detail retrieval of these new

pre-amplifiers is dramatically superior to our previous product.

Frequently, the perception of increased detail comes at the cost of

equally increased grain or edginess in the music. With this new pre-

amplifier, hundreds of hours of thoughtful listening and careful

adjusting have produced a product where the enhanced detail simply

comes through as greater spatial refinement and dynamic accuracy;

without any loss of musicality. Bass definition is better than in

pervious models, highly dynamic passages typically have more weight,

a more accurate leading edge with increased control and the spectral

balance is more finely integrated top to bottom.

We sincerely believe these are simply the best pre-amplifiers Pass

Laboratories has ever built! Thank you for giving us the opportunity to

prove this claim.

ADVISORY

There is an Extremely Small (but Non-zero) Chance That, Through a

Process Know as Tunneling, This Product May Spontaneously

Disappear from Its Present Location and Reappear at Any Random

Place within the Universe, Including Your Neighbor's Domicile.

November 18, 2010 Rev 1.02 6

The Manufacturer Will Not Be Responsible for Any Damages,

Inconvenience or Mental Anguish That May Result From These

Spacetime Perturbations.

There is a much higher probability that when you first plug your new

pre-amp into the wall and listen that you will not be experiencing the

full measure of performance this product is capable of. These are high

bias Class A topology circuits and their performance is largly

temperature dependendt. We expect these circuits to heat up slowly

through normal operation, do not attempt to augment that heating by

any artificial means. Temperature and performance will slowly

stabalize over the first 24 hours of operation and thereafter will be at

their sonic best. Be aware however that if you unplug or otherwise

remove power from the unit that the warm up period starts afresh.

Please give this product at least 24 hours initial warm up time

before attempting any critical listening.

Like virtually all modern digital product, there is no “off” in the

traditional sense. The XP preamps are quite “Green” a typical current

draw for this product is 10 watts; they are designed to be powered up

100% of the time.

SET-UP AND OPERATION

So much for the philosophy, physics and advantages, lets play music.

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.

November 18, 2010 Rev 1.02 7

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 first one removed any time you hook up or remove

equipment from the signal chain.

The preamplifier has five sets of stereo input connections, both single-

ended and balanced output connections and a full function remote

control in addition to the normal complement of front panel control

functions.

The preamplifier's voltage and current rating are indicated by affixed

tag on the rear of the preamplifier. This tag will indicate 240 volts, 220

volts, 120 volts, or 100 volts. A 1.0 amp 3AG slow blow fuse is

provided with 100-120 volt units, and a 0.5 amp slow blow fuse is

provided with 220-240 volt units. The input frequency rating of the

power supply is 50 to 60 Hz. The preamplifier typically draws 10 watts

during operation. Please verify that the indicated voltage requirement

of this preamplifier is consistent with the utility voltage at your location.

We have provided a standard IEC AC power cord that fits into the IEC

320 line receptacle at the rear of the preamplifier chassis. The

preamplifier is equipped for operation with an earth ground provided by

the users AC outlet. Do not defeat this ground. The chassis and

circuit ground of the preamplifier are isolated from one another through

a power thermistor, and bonded to earth through the chassis which

gives a ground connection for safety but helps avoid ground loop

related noise issues.

November 18, 2010 Rev 1.02 8

There are a total of five inputs. Two of the five 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 benefits.

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.

Description of Operation

In application the XP-10s 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.

November 18, 2010 Rev 1.02 9

Experience indicates that engaging in a few minutes of exploration will

add much to your ultimate enjoyment of this exceptional Pass Labs

product.

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 preamplifier 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 preamplifier.

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

preamplifier to function as a unity buffer (0dB gain at volume step 75)

for use with components that best function with their own volume

controls, such as surround processors.

November 18, 2010 Rev 1.02 10

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

through input 5 of the XP-10 (with the gain of the XP-10 set for Unity),

the volume will be under full control of the processor and the XP-10's

action will be totally transparent. When the user chooses this setting

the software sets the XP-10's gain to the unity gain setting, regardless

of how it was previously configured. When at Unity both left and right

level controls on the XP-10 will have a displayed value of 75 (0 dB),

and any previous balance settings will be set-aside into a temporary

registry. Both of these default conditions are intentional, and intended

to make the most advantageous use of your source electronics. You

may also set any input to unity (0 dB) by selecting low gain and setting

the volume at step 75.

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

some minimum level. Failure to follow this precaution could result in a

volume level intolerable to both ears and speakers.

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

preamplifier 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.

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