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XP-15 Owner’s Manual

1-3, 5-8 “off ”.  Give the XP-15 a couple minutes to settle in 
electronically and turn the power-amps back on.  Listen to the system 
critically for some time (10 minutes to an hour) using various musical 
selections that you are familiar with.

Now turn the volume down and the power amps off  again, set the 
loading switches to the next lowest resistive value (50 ohms).  Once 
again give the XP-15 a couple minutes to settle in, turn the power 
amps back on and listen to the same musical selections as before.  If  
your test selections sound better with the new loading you can be 
assured that the loading change was in the correct (lower resistance 
in this example) direction.

If  the change in loading resulted in a more pleasant presentation of  
your chosen musical selections, once again turn down the volume on 
the preamp and the power supply off.  Select the next lowest resistive 
loading (25 ohms) and listen to the same selections again. At some 
point you will find a value where the sound deteriorates, move back 
to the last value that sounded excellent.  Once this has done you have 
reached the optimal resistive loading.

If  going below 100 ohm resulted in degraded sound, then obviously 
the correct change would have been to have gone upward next 
highest level above 100 and repeat the listening.  I am sure you get 
the idea, its not complicated but it can be time consuming.  

The eight values available should cover any cartridge needs nicely.  
However should you wish to get very creative resistors can be 
selected in parallel for almost limitless experimentation.  Some 
examples of  additional loading values follow on page 12.   Should 
you wish any combination of  switches may be selected “ON”.  The 
resultant values will follow Ohm’s law for resistors in parallel.  Once 
again this shouldn’t be necessary, but it is available should you wish 
to calculate the myriad of  permutations possible.

Again I would like to stress that you are listening for a musical 
balance in the selections that you play.  Some loading selections will 
offer better bass but poor high-end resolution, some will have better 
high-end and definition but with a flat sound stage.  You are seeking 
an optimal balance of  correct spectral balance in conjunction with 
correct spatial information.  Finding the best compromise will take 
time.

Do not make the mistake of  setting the pre-amp so that it enhances 
one recording only, listen to a variety of  material and adjust 
accordingly.

Содержание XP-15

Страница 1: ...1 XP 15 Owner s Manual pass TM XP 15 Owner s Manual March 27 2009 ...

Страница 2: ...uipment power switch does not provide adequate protection to be considered a service disconnect Grounding Adequate precautions should be taken so that the grounding provisions built into an electrical product are never defeated Power Cords Pass Labs provides a power supply cord that meets all legislated requirements for the market in which the product was originally sold If you choose to substitut...

Страница 3: ... tripod used to support this product is weight rated sufficient to the task 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 For Units With Externally Accessible Fuse Receptacle Unplug the device fr...

Страница 4: ...eration of not only high output moving magnet cartridges but also the lowest output moving coil cartridges without the use of an auxiliary step up transformer By the early 1980 s audiophiles recognized that in general lower output moving coil cartridges were capable of retrieving more fine detail from record grooves than higher output cartridges in many instances this was simply a case of having l...

Страница 5: ...dicate voltage and current requirements for the XP 15 Before operation please verify that the indicated line voltage is consistent with the line voltage where you intend to install this piece of equipment Line voltage is determined at the time of construction and not user changeable Line voltage will be 100 Vac 120 Vac 220 Vac or 240 Vac In addition the rear panel also has a standard IEC 320 inlet...

Страница 6: ... for your particular cartridge you will need to have some salient information on the cartridge If you do not have that cartridge information please contact your dealer or the Pass Laboratories factory We will attempt to help you with that data but by no means do we have factory data on every cartridge ever built Please be aware that the XP 15 is a dual mono design whatever setting you select for o...

Страница 7: ...ables The optimal value is selected by listening There are three capacitive loading switches with values of 330pF 220pF and 100pF these are in addition to a fixed value of 100pF You may select any switch or number of switches the values are additive The range of values available is 100pF 750pF The correct value is that which gives the best overall tonal balance Typically if the cartridge sounds to...

Страница 8: ...in such a way that as the gain is reduced the noise levels seen at the output of the XP 15 are reduced by a like amount In this way there is no penalty to selecting one gain setting over another The exemplary signal vs THD noise figures of the XP 15 are never compromised by changing gain settings Chose a gain setting that allows your pre amp volume control to operate within a range similar to what...

Страница 9: ...e resistance and reactance of that wire must be accounted for in choosing loading values in the XP 15 As long as you derive your final setting empirically you may ignore these effects your moving coil cartridge will not An improperly loaded cartridge will suffer every unwanted sonic anomaly ranging from lack of definition and bass to a very strident and screechy high end Making the mistake of not ...

Страница 10: ...loading If going below 100 ohm resulted in degraded sound then obviously the correct change would have been to have gone upward next highest level above 100 and repeat the listening I am sure you get the idea its not complicated but it can be time consuming The eight values available should cover any cartridge needs nicely However should you wish to get very creative resistors can be selected in p...

Страница 11: ... are certainly critical they can and do provide a measure of insight but are no substitute for human judgment of that which is pleasant As in art classic audio components are the results of individual and collective efforts that reflect a coherent underlying goal and philosophy If successful they make both a subjective and objective statement of quality which is meant to illicit appreciation in th...

Страница 12: ... designs poor intrinsic linearity has been corrected out by large application of feedback resulting in loss of warmth space and detail We give these precepts a great deal of thought in the design and voicing of product You only need to address the cartridge loading till it sounds good to you Some Suggested Resistive Loading Values in 1 2 3 4 5 6 7 8 ohms 10 25 50 100 250 500 825 1K 10 ON OFF OFF O...

Страница 13: ...13 XP 15 Owner s Manual ...

Страница 14: ...14 XP 15 Owner s Manual ...

Страница 15: ...15 XP 15 Owner s Manual ...

Страница 16: ...0 volts rms Output Impedance 300 300 ohms Input Impedance 47 K or 1K 0 650 pF MM 5 ohm 47K ohm moving coil Unweighted Noise 90 dB ref 10 mV input moving magnet 81 dB ref 1 mV input moving coil Power consumption 15 watts Dimensions 17 W x 12 D x 4 H Shipping Weight 25 pounds in packing carton Pass Laboratories PO Box 219 24449 Foresthill Rd Foresthill CA 95631 USA www passlabs com service passlabas...

Страница 17: ...struction 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 verifiable by serial number Any modifications to Pass Laboratories products that have not received writt...

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