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HE-9 LE
(HE-9 Linear Power Edition)
Real Balanced ACSS Pure Class A headamp and Preamp
　

Please note:
         This product applies the latest regenerate power technology. Therefore the working temperature has dropped significantly compared to the previous generation products. This allows leaving power on over the long term.
        This product is burned-in for at least 300 hours before shipping.
        We recommend burning it for an additional 300 hours for best results.
        The quickest way to complete the burn-in of this product is to power on it continuously, no matter with or without music playing to the burn-in.
        Do not immediately power on the unit after powering it off. Wait for at least 30 seconds.

Connect with KRELL amplifiers:
         HE-9 LE is compatible with KRELL amplifiers CAST inputs.
        A cable can be made with one side connecting to HE-9 LE ACSS outputs, other side to a  KRELL amplifier CAST inputs.
         The ACSS output pins:
         Pin 1, GND
         Pin 2, Hot
         Pin 3, Cold
         Pin 4, GND
         The ACSS input pins:
         Pin 1, GND
         Pin 2, Hot
         Pin 3, Cold
         The XLR input/output pins:
         Pin 1, GND
         Pin 2, Hot
         Pin 3, Cold

Button and display functions ：

Display inform:
         Leftmost mean the output channel select.
        Left 2nd mean the input channel number .
         Left 3rd mean the pre-volume control.
         The remaining digit mean the volume level, number higher volume is higher .

HP/PRE button:
        Push the HP/PRE button once, the leftmost digit will blink, which indicates it is selected.
When it blinking but not push the HP/PRE button, 3 seconds later it stop blink and switch the output channel between H and P (headphone and preamp). If push the HP/PRE button again while it blinking,  there is a little LED at the right bottom of the leftmost digit light or dark, when the LED light mean enables the display's auto-dimming; the display will dim 10 seconds after the buttons are left untouched, only keeping a LED bar lit to indicate the unit is turned on. As soon as a button is touched, the display will turn back on. When the LED dark mean disables the display's auto-dimming, the display will remain on at all time.

Gain button:
        Push the Gain button once, the left 2nd digit will blink, which indicates it is selected.
When it blinking but not push the Gain  button, Turn the volume port down or up, the second digital change from between 1 to 9, 9 mean no attenuation , down every 1 steps mean the pre-volume with -1DB attenuation , when turn to 1, that mean -8DB attenuation of the pre-volume. The pre-volume control only available for XLR and RCA inputs.
         While the left 2nd digit blinking, push the Gain button again , there is a little LED at the right bottom of the digit light or dark, when the LED light mean enables the high gain mode, gain is 20DB, when the LED is dark, mean enables the low gain mode, gain is 10DB. The HE-9 MK2 apply the latest technology, no any switch or parts change in the gain modes so there is no effect on the sound quality,just choice the proper gain for the power amp  .

Selector button:
         While the display is in normal state (not blinking), it allows selecting the input source in decreasing order. One of the following will be displayed:
"1 - XLR";
"2 - RCA";
"3 - XLR";
"4 - RCA";
"5 - ACSS";

Knob:
         For change the volume .

The unit applied input short design :
         The unit  had design the analog idle input short circuit for avoid the disturb between different sources.
         This design also applied in a lot high end brand devices.
         The working theory :  Without the idle input short circuit ,if the input 5 and input 4 had connect two extra DACs,  while users select the either input 5 and input 4 , the another input signal will fire through the circuits and mix  into the using signal, even though this signal is  weak  but still can degrade on the sound quality.
          With the idle input short circuit function : if user select either the input 5 and input 4, the another input signal will short circuit then no any signal fire through circuits , can keep the sound quality had not degrade.
          In world there are more than 99% DACs and the sources had allow the outputs short ,           Below case users don't want the idle input short circuit function, users can open the chassis, pull off the jumpers of the proper input channels, please note must pull off of left and right channels together :
        1, The same extra source not only connect the unit analog input, but connect with other amps simultaneity.
        2, The same extra source connect to the unit different inputs  at simultaneity.