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XP-12_om_10.17

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

routed through input 5 of the XP-12 (with the gain of the XP-12 set 

for Unity), the volume will be under full control of the processor 

and the XP-12’s action will be totally transparent. When the user 

chooses this setting the software sets the XP-12’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-12 will 

have a displayed value of 89 (0 dB), You may also set any input to 

unity (0 dB) by selecting low gain and setting the volume at step 89.

 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.  

Wayne Colburn’s exceptional volume control in conjunction with 

the fluorescent display gives the user ability to replicate volume 

levels with absolute accuracy in steps of roughly 1 dB.

The remote control uses multi-button direct access architecture.  

This remote is designed to operate several pieces of Pass Labs 

electronics, not all of the functions available on this remote will be 

applicable to your Pass Laboratories XP-12.

The Remote control operation is, or should be very intuitive in 

operation; we have attempted to make its operation as familiar 

as possible.  Where applicable the remote mirrors the front panel 

controls.

Power, tape and ext. amp on (external amplifier turn-on) are not 

used with the XP-12. These specific control functions are for other 

products and have no effect on this product.  

MUTE: pressing mute once will quiet the pre-amplifier outputs; 

pressing mute a second time will return you to the previous volume 

control setting 

INPUT SELECTION: Pressing. 1,2,3,4,5 will immediately move the input 

selection to that input selection; volume and balance settings will 

not be disturbed.

 

Summary of Contents for XP-12

Page 1: ...1 XP 12_om_10 17 PASS TM XP 12 Owner s Manual ...

Page 2: ... 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 p...

Page 3: ...th vacuum impregnating and epoxy fill This gives us a very quiet transformer both electrically and mechanically The power supply circuitry itself is also lower noise and has additional filtering a little more complicated but worth it The XP 12 uses the single stage volume control borrowed from the XS line preamp This gives us one hundred 1 dB steps with lower noise and distortion while removing so...

Page 4: ...ation with an earth ground provided by the users AC outlet Do not defeat this ground 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 output...

Page 5: ... discussed at length later in this manual The two select arrows logically control selections of the various inputs to the preamplifier 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 minimum Failure to follow this precaution could result in a volume level intolerable to both ears and speakers The standard 2 vol...

Page 6: ...cking 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 Wayne Colburn s exceptional volume control in conjunction with the fluorescent display gives the user ability to replicate volume levels with absolute accuracy in steps of roughly 1 dB The remote contr...

Page 7: ...he display When off is selected any other control function will cause the display to indicate product operational status for approximately 7 seconds and then the display will once again blank Pressing the display button a third time cycles back to a bright display We recommend the use of the balanced output mode where possible Balanced input to power amplifiers will typically retain the character ...

Page 8: ...d it ever be necessary to update the software that controls the functioning of the preamp only the socketed micro processor need be changed Muting relays which delay connection during turn on and shut off the output when insufficient power supply is available to maintain regulation guard the output of the preamplifier and offer protection to the power amplifier and loudspeakers XP 12 Specs Power c...

Page 9: ...North America customers should consult with their original Pass Labs dealer or distributor for warranty repair instruction 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 ...

Page 10: ... Labs dealers or to third parties located in the United States or Canada For more information please contact 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 PASS Pass Laboratories Inc 13395 New Airport Rd Suite G Auburn CA 95602 voice 530 878 5350 fax 530 ...

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