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X0.2 Owner’s Manual

The pre-amplifier consists of  three machined aluminum chassis; it 
has five sets of  input connections, two sets of  outputs, both single-
ended and balanced, a tape loop and a full function remote control 
unit that mirrors the front panel functions.  

The power supply control chassis has a  5-way binding post that is 
used for remote amplifier turn-on. The pre-amplifier’s voltage and 
current rating are indicated by the affixed tag on the bottom of  the 
pre-amplifier’s power supply control chassis.  This tag  will indicate 
either 240 volts, 220 volts, 120 volts, or 100 volts.  A 0.5 amp 3AG 
slow blow fuse is provided with 100-120 volt units, and a 0.25 amp 
slow-blow fuse is provided with 220-240 volt units.  The frequency 
rating of  the X0.2 power supply is 50 to 60 Hz.  This pre-amplifier 
typically draws 30 watts during operation.  Please verify that the input 
power rating as indicated on your unit is consistent with that supplied 
in your area before attempting hook up.  

The remote control is powered by two (2) factory installed AAA 
batteries. 

The individual gain channels connect to the power supply control 
unit with four (4) necessary cables and to each other with one 
optional cable.  

These cables must be installed before the 

preamp is powered up

.  The cable jacks are clearly labeled on 

the rear of  each chassis and are style and gender specific  so as to 
minimize opportunity for mis-connection. 

Both gain channels are identical electrically, the only difference is the 
color of  the identifying rings under the RCA connectors. The right  
channel is identified by red rings under the RCA’s connectors and 
the left by white rings.  Additionally the right gain stage chassis has a 
female XLR marked “mono” and the left gain control chassis has a 
male XLR marked “mono” as a further identifier.  

The X0.2 takes maximal advantage of  four identical gain paths 
(two identical paths per channel) very much unlike the typical two 
gain path (one signal path per channel) pre-amplifier you may be 
familiar with.  Almost without exception traditional consumer audio 
pre-amplifiers, unlike their science and industry counterparts have 
maintained a single signal path per channel (two identical aths in a 
stereo pair).  

In order to manage balanced signals these two gain path pre-
amplifiers must utilize phase combining networks to process 
incoming signals and subsequently drive outputs via phase splitting 
circuits to re-establish a quasi-balanced signal. This manipulation of  

Setup

Summary of Contents for pre-amplifier

Page 1: ...1 X0 2 Owner s Manual pass TM X0 2 Owner s Manual May 18 2006 ...

Page 2: ...nce specifications It pushes the edge of the art in exploring how much subjective quality is obtainable with a new but very elementary gain stage The X0 2 employs a patented new type of volume control that offers significantly better performance than seen before in an electronic control It provides over 60 dB of range large voltage swing and very good measured performance The distortion and noise ...

Page 3: ...ur 4 necessary cables and to each other with one optional cable These cables must be installed before the preamp is powered up The cable jacks are clearly labeled on the rear of each chassis and are style and gender specific so as to minimize opportunity for mis connection Both gain channels are identical electrically the only difference is the color of the identifying rings under the RCA connecto...

Page 4: ...ono cable installed between these connectors unless you plan to operate the X0 2 in mono mode You may use our supplied mono cable or an aftermarket male female XLR of your choosing If you choose an aftermarket cable length should be consistent with the placement of your equipment and not excessively long The DIN connectors plug into their mating jacks and then screw into the rear panel on all thre...

Page 5: ... higher with a differential impedance of at least 20K Ohms Next to the inputs on the rear panel of the gain stages the pre amplifier offers tape inputs through both XLR and RCA connectors This output is a direct connection to inputs 1 2 3 4 and 5 when they are selected from the front panel Input 6 TAPE IN is deliberately not available through the tape output connection Tape input is designated for...

Page 6: ...p pointing arrow representing on and the down pointing arrow v representing off Mute Tape Mono and Amp The leftmost function as selected by the two mode switches is volume and the up down arrows select 72 steps incrementally indicated on the fluorescent display as 0 71 A more traditional knob located at the far right of the front panel which is always active exactly duplicates this control functio...

Page 7: ... intolerable to both ears speakers and bank account We trust that the remote control with its four buttons that duplicate those of the preamp front panel will enable you to quickly select inputs and establish levels of output The rear mounted pair of five way binding posts on the power supply control unit are intended to actuate the remote on off function of our own X series power amplifiers from ...

Page 8: ...tribute to the degradation but there are some different characteristics that are worthy of attention For example smooth low order nonlinearities are additive in quality bringing false warmth and coloration while abrupt high order nonlinearities add harshness and false brightness 3 Maximum intrinsic linearity is desired This is the performance of the gain stages before feedback is applied Experienc...

Page 9: ...changed The analog power supply for the X0 2 consists of a toroidal power transformer delivering an unregulated 45 volts which is then actively regulated before feeding passive filtering and powering the constant current sources which bias the gain stages Each channel has its own regulation The power supply noise reaching the circuit is on the order of one microvolt and the little of that which ge...

Page 10: ...ced 20K ohm balanced CMRR typ 80 dB 20 20kHz Crosstalk typ 90 dB 20 20kHz Output Noise floor 110 dBV 20 20kHz Extl amp turn on 12 volts DC 50 mA continuous Power Consumption 35 watts Dimensions 17 W x 3 5 H x 13 D each Shipping Weight 70 pounds in packing carton 3 units For more information please contact Pass Laboratories Inc P O Box 219 24449 Foresthill Rd Foresthill CA 95631 Tel 530 367 3690 Fa...

Page 11: ... 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 12: ... 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...

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