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XA60 Owner’s Manual

We have provided a standard IEC power cord that fits into the 
standard 15 amp IEC receptacle at the rear of  the amplifier chassis.  
Two XA60’s may be run on a single 15-amp circuit in conjunction 
with other audio components.  This amplifier is equipped for 
operation with an earth ground provided by the users AC outlet. 
Never defeat this ground connection.  The signal ground of  this 
amplifier is connected to earth through a power thermistor, which 
provides a safety ground but provides protection from irritating 
ground loops.

As a safety issue we suggest that the power cord should be the last 
cable installed on your power-amplifier.  You may, if  you wish, 
substitute a 15-amp aftermarket power cord for the one we have 
supplied. Only use power cords, which meet all local safety standards 
and carry acceptance marks from the local regulatory authority. The 
power cord should be attached to the amplifier prior to plugging 
into house power.  Place the rear-mounted switch in the off  (down) 
position before plugging in this amplifier. 

The amplifier’s voltage and current rating are indicated on the 
rear panel.  It will be either 240 volts, 220 volts, 120 volts or 100 
volts, all units protected by a type 3-AG slow blow fuse of  the 
appropriate ampacity. The operational voltage is not user changeable. 
Transformers are input voltage specific and their change is not a 
trivial matter. 

The frequency rating of  the AC line source is 50 to 60 Hz in all 
cases.  Please verify that the amplifiers indicated voltage requirements 
are consistent with the supplied voltage and current at your location.

Looking at the rear panel you will see the IEC AC power cord 
receptacle, a power switch, type 3-AG fuse holder, two pairs of  
output connectors which allow for speaker bi-wiring, a single pair of  
5 way connectors for remote turn-on, a single RCA input connector 
and a single XLR balanced input connector.

Make sure that the rear panel power switch is off  (down).  Plug 
the AC cord into the back of  the amplifier, and then into the wall.  
Then turn the power switch on (up).  The lights in your house may 
blink when the power supply charges the capacitors.  (Note: The 
power switch is never to be used as a “safety device” or “emergency 
disconnect” for this product.  This device will not provide 
comprehensive personal shock protection in the event of  a reversed 
hot / neutral, lack of  grounding or other improper wiring of  the 
supplied mains voltage.)

Setup

Summary of Contents for XA60

Page 1: ...1 XA60 Owner s Manual pass TM XA60 Owner s Manual May 18 2006 ...

Page 2: ...rcuit topology that we descriptively characterize as being Single ended Class A This new topology combines the very best characteristics of Pass Laboratories X series amplifiers and the highly rated Pass Laboratories Aleph The XA series is the marriage of a highly refined Aleph output stage with the patented Supersymmetry X front end The emphasis of the XA series is to accentuate performance and s...

Page 3: ...le into any load presented by a loudspeaker but will provide less power into other than 8 ohms The XA60 accommodates both single ended RCA and balanced inputs XLR Input impedance s are 11 kohm unbalanced and 22 kohm balanced to permit integration with the widest possible range of upstream components You can position this amplifier anywhere you wish but it must have ventilation We do not recommend ...

Page 4: ...ar panel It will be either 240 volts 220 volts 120 volts or 100 volts all units protected by a type 3 AG slow blow fuse of the appropriate ampacity The operational voltage is not user changeable Transformers are input voltage specific and their change is not a trivial matter The frequency rating of the AC line source is 50 to 60 Hz in all cases Please verify that the amplifiers indicated voltage r...

Page 5: ...se Some powered subwoofers require an audio signal ground reference and their makers may suggest that a black speaker terminal is where this voltage reference might be found On complementary designs which would be typical of all power amps produced by Pass Laboratories this is an incorrect and unsafe assumption On all Pass Laboratories power amplifiers a reference of 0 volts will be found only at ...

Page 6: ...product is very low This is small comfort to the few but take it easy and give us a call if you have problems People are interested in how long it takes for these amplifiers to break in Depending on the resolution of the rest of your audio chain you may or may not notice any break in of the XA60 beyond the first 50 hours of operation You will likely notice the difference in sonic character between...

Page 7: ...lightly less distortion at a given voltage current level than resistive loads The XA circuit was designed to be quite happy driving electrostatic speakers and any other esoteric loads we know of We have a general recommendation about interconnects and speaker cables which is that they should cost less than the amplifier and contain at least some conductive material We have tried a lot of products ...

Page 8: ...supply filter capacitors These caps are used to create the unregulated output stage rails RC filtering is used to passively remove ripple from the supply rails All the power transistors in the product are hyper matched parts with gate voltages matched to 0 5 and all devices taken from the same manufacturing lot codes made on the same wafer So how long will this hardware last It is our experience t...

Page 9: ...l Slew rate plus minus 50 V uS Output Noise 300 uV unweighted 20 20 kHz Balanced CMRR approx 60 dB 1 kHz DC offset 100 mv Power Consumption approx 300 watts Temperature 25 degrees C above ambient at idle Dimensions 19 W x 7 H x 20 D Shipping Weight 68 lbs For more information please contact Pass Laboratories Inc P O Box 219 24449 Foresthill Rd Foresthill CA 95631 Tel 530 367 3690 Fax 530 369 2193 ...

Page 10: ... of origin for warrantee service Foreign distributors are only required to offer warranty service on Pass Laboratories product that they have imported Please note Conditions of warranty service and customer rights for product purchased outside the United States may vary depending upon the distribu tor and local laws Please check with your local distributor for specific rights and details Any modif...

Page 11: ... 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 a...

Page 12: ...speakers putting Pass Laboratories X amplifiers on the bottom for power and control conjoined with Alephs on the top for that smooth warm midrange and top end We well appreciate these complementary differences and for the past few years Pass Laborato ries has been at work marrying these two design concepts into a single amplifier topology The trick was to create an amplifier which carries the best...

Page 13: ...d for preamplifier circuits high quality amplifier front ends and other very low power output stages US Patent 5 710 522 describes the single ended Class A power ampli fier biased by a constant DC current source which negatively ghosts the speaker load with simple but effective current modulation If you have followed developments in audio for the last 10 years you know this design as the Pass Labo...

Page 14: ...ve ambient temperature so that actual chip temperatures are about 70 degrees below their rating The output devices are designed to last a very long time under these conditions with a probable life of about 50 000 hours The power supply of the XA 200 uses elaborate RF filtering and noise sup pression designed to block AC noise and line DC The substantial toroidal power transformer is followed by hi...

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