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leave  this  terminal  disconnected.  Do  not  connect  the  Ground  terminal  to  anything  except  the 
ground connection from your turntable.

In  lieu  of  the  built-in  RIAA  Output  Module,  the  Ground  will  be  mounted  on  the  chassis  in  the 
LEFT RIAA output position. The Ground chassis position shown in the figure will be occupied by 
the 5-pin power connector for the optional external RCM (RIAA Correction Module).

Power-Up (Initial) Configuration

Charge  Lock

:  Initialize  indicator  by  pressing  button  after  first  connecting  power,  if  not 

illuminated. 

Sig

  indicator:  initially  on,  extinguishing  after  several  minutes. 

(If  the  Sig  indicator  does  not 

extinguish, be sure to check if an input connection has become loose or dislodged.)

Gain

: must be initialized after connecting power, see below.

Gain Adjustment

Upon connecting the power supply, the gain setting must be initialized

 by pressing the front 

panel  Gain  button  several  times,  until  the  Low  (Light  Blue)  indicator  appears. The  gain  setting 
will be preserved as long as power is supplied (and, as indicated below, in the AGM Rechargeable 
Battery  Operation  and  Charging  section,  the  Seta  should  normally  be  maintained  in  a  powered 
state).

WARNING! 

Always  make  changes  to  the  Gain  Setting  at  a  reduced  or  muted 

playback volume,

 

to keep 

loud

 transients (thumps) from playing through the loudspeak-

ers. The Seta gain control isn’t meant to be adjusted frequently. It’s designed for ease (in 
contrast to having internal jumpers or switches) of setting the phono preamplifier gain, to 
provide  the  optimum  input  signal  level  for  your  digital  audio  interface  and  phono 
cartridge.  With  that  purpose  in  mind,  any  circuitry  for  preventing  “thumps”  that  also 
could compromise audio quality was omitted in the Seta design.

Indicator Color / Gain

Light Blue (Low)

Blue (Medium)

Violet (Medium High)

Red (High)

Gain (Flat Outputs)

43 dB
46 dB
49 dB
53 dB

Gain (RIAA Outputs)

55 dB
58 dB
61 dB
65 dB

Summary of Contents for SETA L

Page 1: ...wer jack on the rear panel of the Seta It will take the Seta at least one hour for the internal circuitry and solid copper parts to become stabilized to normal operating temperature The following items are included Please check the package and notify Channel D of any shortage Seta Preamplifier with Internal AGM Batteries Installed External DC power supply 110 220 Volt Input 2 Wire Isolated Input P...

Page 2: ...rs for applying RIAA compensation or other similar software on other computer platforms Consult the Pure Vinyl software User Guide for more information If using an audio interface with single ended unbalanced inputs not recommended do not connect either XLR output pin to common ground The correct wiring configuration would be to use XLR Pin 2 as signal and XLR Pin 1 as ground if using a balanced t...

Page 3: ...be initialized by pressing the front panel Gain button several times until the Low Light Blue indicator appears The gain setting will be preserved as long as power is supplied and as indicated below in the AGM Rechargeable Battery Operation and Charging section the Seta should normally be maintained in a powered state WARNING Always make changes to the Gain Setting at a reduced or muted playback v...

Page 4: ...ed to offer quieter operation and wider bandwidth with low output moving coil cartridges than is possible with the circuitry used in the Model H Note the Model L cannot be used with high impedance cartridges such as moving magnet or high output moving coil Note If you re accustomed to using conventional phonograph preamplifiers the available Flat Seta gain settings may seem somewhat lower than usu...

Page 5: ...ndex line on the shaft to assist in determining the selector position Note the load settings correspond to having the Single Ended jumpers see below set to the factory supplied Balanced position 25 Ohms 50 Ohms 100 Ohms 150 Ohms 200 Ohms 300 Ohms 500 Ohms 750 Ohms 1000 Ohms 2000 Ohms Other load settings can be obtained by inserting user supplied resistors in the sockets provided on the main circui...

Page 6: ...d The sockets are premium machined gold fingered high reliability type The sockets are on 0 3 inch centers and will accommodate the leads of typical passive resistors and capacitors with this lead spacing Removing Cover Seta with RIAA Correction Module shown Seta Plus Remove 6 hex screws inset figure shows side view Seta Remove 4 Philips screws inset figure shows side view ...

Page 7: ...operation it is strongly advised that balanced shielded twisted pair cable be used to connect the turntable to the Seta This may entail rewiring the turntable For low impedance low output cartridges such as moving coil with an internal resistance of 100 ohms or less and nominal output voltage around 0 6 mV or less shielded twisted pair microphone standard audio signal cable can be used For high im...

Page 8: ...over 24 hours of continuous operation The AGM type lead acid battery is superior to all other battery types used in high end audio applications see http www channld com seta html under the Rechargeable Battery section The Seta will automatically activate Charge mode under either of the following two normal conditions A signal resulting in an output level of less than 40 dBV isn t detected for abou...

Page 9: ... capacity of approximately 2 3 ampere hours is acceptable For example McMaster Carr part number 7448K13 Power Sonic PS 630 The batteries must be replaced in pairs and only sealed lead acid type batteries can be used All other battery types are incompatible with the internal battery monitoring and maintenance circuitry and Seta power and voltage requirements It s best to obtain a fresh replacement ...

Page 10: ...ve low frequency EQ Independent single ended RCA ground referenced and balanced outputs low noise 4 layer circuit boards and surface mount component technology Gain adds 12 dB to flat signal Channel Separation 80 dB 20 Hz 20 kHz greater than 100 dB at 1 kHz Frequency Response 3 dB DC to 12 MHz balanced or single ended outputs Channel Match better than 0 02 dB 10 Hz 50 kHz Deviation from RIAA Stand...

Page 11: ...mmended move all four jumpers indicated into the DC position Neumann RIAA Curve Modification The Seta is configured from the factory for the standard RIAA curve The Neumann modification introduces an extra high frequency time constant to compensate for the putative roll off of the mastering lathe cutting head The Neumann setting can be enabled by removing the two jumpers indicated or placing them ...

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