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XA60.5 Owner’s Manual

XLR.  If  you re-install the jumper incorrectly or leave it lying about, 
the amplifier will not work properly, and you will be able to tell.

Choose either XLR or RCA inputs.  If  you run both at once from 
different components, the sound is not likely to be optimal, but it 
shouldn’t cause damage anywhere.

Now that the source component is connected, turn the volume all 
the way down.  Plug the power cord back into the wall, and turn on 
the rear power switch.

Push the front panel button to activate the amplifier.  The lights will 
come on.

You are ready to play music

With any luck, you can now enter that blissful state, and we won’t 
expect you back for a while.

It’s always possible that something may go wrong.  If  so, don’t get 
excited.  We know It’s really aggravating when a product doesn’t 
work, but it will get fixed, and often it’s something really simple.  

We go to a lot of  trouble to make products reliable, and the failure 
rate of  our amplifiers 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 amplifier 
beyond the first few hours of  operation. You will very likely notice 
the difference in sonic character between cold and normal operating 
temperature over the first hour, so we recommend letting these 
amplifiers warm up before any serious listening. 

This generation of  amplifiers warms up faster and is more bias-stable 
during warm up than previous versions, but we still recommend an 
hour for critical listening.  At the factory we adjust the bias and offset 
values initially and then after warm-up and then again after 48 hours,
If  necessary.  The “sweet spot” is a sink temperature between 50 and 
55 degrees C., but this is not critical, and will vary with your room 
temperature.  You should be able to put your hands on the heat sinks 
without undue discomfort for 5 seconds or so. 

The amplifier has a thermal cutout that will disconnect AC power if  
the temperature exceeds 75 degrees Centigrade.  This thermal cutout 

Summary of Contents for XA60.5

Page 1: ...1 pass XA60 5 Owner s Manual May 17 2007 ...

Page 2: ...power amplifiers based on the SuperSymmetric topology U S Patent 5 376 899 which elicits high power and performance from simple circuits with minimal feedback The first X amplifier the X1000 was intended as the premier example of the power of this principle delivering 1000 watts rms into 8 ohms at low distortion By itself of course this is no miracle but you have to consider that products with com...

Page 3: ...ts are the result of trial and error and extensive listening Measurement of performance is important to us and we feel that well designed product sounds good and measures good Apparently it is possible to make an amplifier which measures well but which does not please the ears and so we let our ears be the final judge X 5 and XA 5 amplifiers utilize the same basic circuit topology and gain devices...

Page 4: ...carefully and critically to our amplifiers with a wide variety of associated equipment and we take our time with it Musical performance is most important and is the basis of our success over the years It s true that we also value the other things The design and manufacturing decisions have to balance subjective performance against reliability cost specs and ego in approximately that order That is ...

Page 5: ... minimum noise this switch should be toggled in stand by mode We have provided a standard IEC power cord that fits into the standard 15 amp IEC receptacle at the rear of the amplifier chassis With the exception of the largest of the X and XA series there is no difficulty running two amplifiers on a single 15 amp circuit Given the high current draw we generally do not recommend active line conditio...

Page 6: ... noise and slightly less distortion They are recommended unless your favorite source component has only RCA outputs Also on the rear panel are the output connections for the loudspeakers On stereo amplifiers there is one pair per channel and on mono amplifiers we provide two pairs wired in parallel to facilitate bi wiring a loudspeaker As you are probably familiar the red one is positive polarity ...

Page 7: ...power cord from the wall while you connect the speakers and inputs Check to make certain that the loudspeaker cables aren t shorted at the loudspeaker end connect speaker cables to the output binding posts on the amplifiers observing correct polarity The output binding posts will accept either bare wire or spades Regulatory agencies in many countries have banned binding posts that will accept a ba...

Page 8: ...mall 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 amplifier beyond the first few hours of operation You will very likely notice the difference in sonic character between cold and normal o...

Page 9: ...uple hundred feet Fortunately this amplifier is not sensitive to the capacitive inductive character of some of the specialty speaker cables so feel free to experiment We have found that about 90 per cent of bad sounding cables are really bad sounding connections and we recommend that attention be paid to cleanliness of electrical contact surfaces and proper connector fit Speaker cables should be f...

Page 10: ...built industrial design not a frail tube circuit run on the brink of catastrophic failure If it breaks we will simply get it fixed so sleep well Pass Laboratories PO Box 219 24449 Foresthill Rd Foresthill CA 95631 USA www passlabs com sales passlabs com service passlabas com tel 530 367 3690 fax 530 367 2193 pass Pass Pass Labs Pass Laboratories Supersymmetery Aleph and Zen and are all registered ...

Page 11: ... 1 60 W Maximum Output Voltage 35 volts Maximum Output Current 20 amps Input Impedance 30 kohm balanced 15 kohm unbalanced Damping factor 150 ref 8 ohms nominal Slew rate 50 V uS Output Noise 150 uV unweighted 20 20 kHz Random noise floor 1 uV Dynamic range 150 dB random noise floor to peak output Balanced CMRR Balanced CMRR Balanced CMRR 60 dB 1 KHz DC offset DC offset DC offset 50 mv Power Consu...

Page 12: ...e 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 specific information Any modifications to Pass Laboratories products that have not received written factory approval nullify all claims and void the warranty Should a modified product be returned to the factory for repair the owne...

Page 13: ...wer 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 Never under any circumstance insert a cut or damaged power cord into a mains power socket insert a cut or damaged power cord into a mai...

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