MAIN FEATURES

Me­chan­ics

The JA­SON uses a high-qual­ity top-loader trans­port sys­tem. A heavy-duty mo­tor dri­ven lid pro­tects the CD and also safely puts the puck onto the CD upon clo­sure. The mo­tor is of the same Swiss brand as NASA is us­ing for their Mars mo­biles. The JA­SON em­ploys a twin metal frame. The in­ner chas­sis is made of steel and acts as a very ef­fec­tive shield against elec­tro­sta­tic and elec­tro­mag­netic ra­di­a­tion. The outer frame is made of mas­sive an­odized alu­minium for ad­di­tional shield­ing, re­sult­ing in op­ti­mal heat con­vec­tion and beau­ti­ful looks. The four feet have been de­signed for op­ti­mum vi­bra­tion and shock absorption.

Trans­port
The JA­SON uses the renowned Philips CD­PRO2M trans­port as its core unit. The mas­ter clock for the CD­PRO2M unit is gen­er­ated by our own clock circuitry.

Power Supply
A pow­er­ful non-switch­ing power sup­ply is used. All sen­si­tive volt­ages have their own reg­u­la­tors. The power switch ac­ti­vates a semi­con­duc­tor re­lay which only switches on or off at zero cross­ings of the mains volt­age. This as­sures a glitch free power switching.

Syn­chro­niza­tion
An in­ter­nal high pre­ci­sion and low jit­ter clock gen­er­a­tor gen­er­ates all clock­ing sig­nals, in­clud­ing those nec­es­sary for the CD­PRO2M transport.

Up-sampling, Word-length Reduction, Jitter Processing

The JA­SON con­tains an up-sam­pler fea­ture which al­lows the ba­sic 44.1 kHz/16 Bit data stream of the CD to be up-sam­pled to 88.2 kHz or 176.4 kHz for sub­se­quent D/A con­ver­sion. Our own state of the art al­go­rithms for the up-sam­pling as used by many of our pro­fes­sional stu­dio cus­tomers are put to work.

Since the up-sam­pling process has the ef­fect of gen­er­at­ing a word-length longer than 16 Bits, a 40 Bit Float­ing Point for­mat is used. This is then re­duced in its word-length to fit the stan­dard AES/EBU or S/PDIF for­mats. This word-length re­duc­tion uses the POW-R #3 al­go­rithm. POW-R is the de-facto stan­dard in pro­fes­sional au­dio for word-length re­duc­tion. POW-R has been de­vel­oped by the “POW-R Con­sor­tium LLC”, where Weiss En­gi­neer­ing Ltd. is one of the four mem­ber com­pa­nies. The out­put word-length can be se­lected be­tween 16, 20 or 24 Bits, which al­lows the con­nec­tion of a wide va­ri­ety of D/A con­vert­ers to the JASON.

The JA­SON uses a spe­cial method to treat the out­put sig­nal so that jit­ter gen­er­ated in sub­se­quent ca­bles or D/A Con­vert­ers has less in­flu­ence on the au­dio qual­ity. This al­lows D/A Con­vert­ers with non-ideal jit­ter per­for­mance to be used with en­hanced sonic quality.

Dig­i­tal Outputs

 

Con­nec­tor

Sam­pling Fre­quen­cies (kHz)

Word-length

For­mat

RCA

44.1 fixed

16 Bit fixed

S/PDIF

TOSLINK (op­ti­cal)

44.1 fixed

16 Bit fixed

S/PDIF

Sin­gle XLR

Sin­gle wire 44.1, 88.2, 176.4
se­lec­table

16, 20, 24 Bit
se­lec­table

AES/EBU

Dou­ble XLR

Dou­ble wire 88.2, 176.4
se­lec­table

16, 20, 24 Bit
se­lec­table

AES/EBU

BNC

44.1, 88.2, 176.4
se­lec­table

16, 20, 24 Bit
se­lec­table

AES/EBU

ST Optical

44.1, 88.2, 176.4
se­lec­table

16, 20, 24 Bit
se­lec­table

AES/EBU

Front panel controls
The power switch al­lows to switch on or off the JA­SON unit. Five switches to con­trol the trans­port for skip back­ward, skip for­ward, stop, play/pause and lid open/close. A high res­o­lu­tion graph­i­cal dis­play con­veys in­for­ma­tion on the track num­ber played, play­ing time, sam­pling fre­quency, out­put word-length.

Re­mote Control
The re­mote con­trol has the stan­dard trans­port con­trols in­clud­ing a ten key nu­mer­i­cal key­pad. In ad­di­tion there are but­tons for var­i­ous kinds of time dis­plays, sam­pling fre­quency se­lec­tion, out­put word-length se­lec­tion, ab­solute phase switch­ing, vol­ume con­trol, dis­play dim­ming, over­all mute con­trol and last but not least a but­ton for switch­ing the “DAC en­hance­ment” mode (via the jit­ter pro­cess­ing as men­tioned above).

Back panel el­e­ments from left to right
  • · USB con­nec­tor for soft­ware down­load (for soft­ware upgrades).
  • · RCA and TOSLINK con­nec­tor for fixed sam­pling fre­quency 44.1 kHz output.
  • · RCA, ST op­ti­cal, BNC, XLR con­nec­tors for sin­gle wire 44.1, 88.2, 176.4 kHz output.
  • · 2 XLR con­nec­tors for dual wire 44.1, 88.2, 176.4 kHz output.
  • · Mains con­nec­tor with fuses and volt­age selector.
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