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  Owner’s Manual

 Comments by Pass

It seems like yesterday...

.  No, actually it seems like eighteen years ago 

that I got a patent on the “Super-Symmetric” circuit.  That’s actually 
a pretty long commercial run for an amplifier design - how many do 
you know that are still on the market after that much time?

We (Desmond, Joe, me and Wayne in alphabetical order) believe in 
progress, but also appreciate where our success has really come from 
- happy customers.  Every innovation that we consider has to address 
how it will improve the customer’s experience with the product.

Technical excellence is a virtue by itself, but it will be the 

sound

 that 

determines the long term success of  a new design after the novelty 
has worn off.  The audio marketplace is littered with products that 
measured spectacularly well but which did not go down as “classics” 
because they lacked the subjective qualities that kept listeners happy 
beyond the initial excitement created by a technical innovation.

With this uppermost in mind we set out to create a new generation 
of  amplifiers that measure well enough, but only in a manner that 
serves the subjective perception of  listeners.  Oscilloscopes and 
distortion analyzers are excellent and helpful tools, but they make 
lousy customers.

It has been argued that the power amplifier should maintain some 
sort of  sacred neutrality -  “

Let the artist be the source of musical coloration, 

not the amplifier!

As if  the power amplifier is the only thing altering the music.  In the 
old days (late 50’s, early 60’s) there was some reasonable technical 
excellence in recording equipment, but it was fairly simple – a 
couple of  level controls.  And the people involved were few and 
usually had some taste.  Nowadays, there are too many people in the 
reproduction chain with too many knobs.  It is no surprise that new 
vinyl issues of  Jazz from that era  fetch high prices.  

Meanwhile the customer is the guy with the most rights, being that 
he is the one paying for it.

That Would Be You.

If  you are concerned that your power amplifier (or anything else 
for that matter) is as objectively and technically accurate as possible, 
that is a perfectly legitimate criterion.  You will certainly find many 
products in the marketplace that excel at conventional objective 
performance, and most of  them are much cheaper.

Содержание Xs 150

Страница 1: ...1 Xs Owner s Manual pass Xs 300 Xs 150 Owner s Manual March 2012 ...

Страница 2: ...nism which requires a clockwise turn after insertion Be certain that this connector locks properly The little lock button will click upon locking After it has been turned and locked it will not rotate back unless you push the locking button Do not attempt to make or undo this connection while the power supply is plugged into the AC outlet Input Connection and Input Impedance The Xs amplifiers take...

Страница 3: ...will light up and the meter will slowly move to near the center position of the dial The Xs 150 takes a while to fully warm up The button on the power supply faceplate is STANDBY the button on the main faceplate turn the white meter LEDs on off The small blue LED in the meter remains on as long as the amp is on In Summary Place the amps Connect power supply and main chassis Plug in AC Turn on brea...

Страница 4: ...ifiers that measure well enough but only in a manner that serves the subjective perception of listeners Oscilloscopes and distortion analyzers are excellent and helpful tools but they make lousy customers It has been argued that the power amplifier should maintain some sort of sacred neutrality Let the artist be the source of musical coloration not the amplifier As if the power amplifier is the on...

Страница 5: ...ture of the amplifier s transfer curve It is apparent that reducing the numerical distortion numbers is not as important as controlling the relative amounts of the harmonics and their polarity Even at low distortion levels these harmonic relationships are important to the perception of musical quality but they are not reflected in ordinary specifications In an amplifier of this sort the power outp...

Страница 6: ... The extra heat sinking is very convenient as the amplifier dissipates about three times its output power rating It is not actually that difficult to gather the massive hardware and fifteen kilowatts of output transistors What is difficult is carefully shaping the relationships between six banks of parallel transistors so as to create the exact transfer curve that delivers just the right harmonic ...

Страница 7: ...ter of the output stage This new front end has a 100 Khz open loop bandwidth and a gain figure which allows about 10 dB of feedback around the output stage The output stage could easily be operated without feedback but it sounds better with this little bit As an aside all this was accomplished without frequency compensation there are no little capacitors in the circuit to trim or stabilize the res...

Страница 8: ...ng Factor 50 Bandwidth DC to 3 dB 150 Khz Output Power 300 watts 8 ohms 600 watts 4 ohms Output Current 48 amps peak Distortion 0 003 1 watt 1 0 300 watts Noise 200 uV unweighted output Power Consumption 1000 watts Dimensions 19 W x 11 5 H x 27 5 D each Weight 168 lbs power supply 130 lbs amplifier Boxed 192 lbs 154 lbs ...

Страница 9: ...ng Factor 50 Bandwidth DC to 3 dB 150 Khz Output Power 150 watts 8 ohms 300 watts 4 ohms Output Current 30 amps peak Distortion 0 003 1 watt 1 0 150 watts Noise 200 uV unweighted output Power Consumption 500 watts Dimensions 19 W x 11 5 H x 21 5 D each Weight 130 lbs power supply 100 lbs amplifier Boxed 150 lbs 120 lbs ...

Страница 10: ...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 owner ...

Страница 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 an...

Страница 12: ...d Foresthill CA 95631 USA tel 530 367 3690 fax 530 367 2193 www passlabs com 2012 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 ...

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