QHW Audio THE BOX II Owner's Manual
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QHW Audio THE BOX II Owner's Manual

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THE BOX II
Owner's manual

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Summary of Contents for QHW Audio THE BOX II

  • Page 1 THE BOX II Owner's manual...
  • Page 2 THE BOX II Owner's manual Index This manual has the following sections:  Safety warnings  Welcome  Rear panel description  Installation and connections  Setting gain  Operation  Troubleshooting...

  • Page 3: Safety Warnings

    THE BOX II Owner's manual Safety warnings NEVER OPEN THE EQUIPMENT: There is a risk of electric shock inside. Only qualified personnel should open the device. There are not user serviceable parts inside. DO NOT EXPOSE THE EQUIPMENT TO MOISTURE OR WATER: Exposing the equipment to moisture or water can lead to a risk of electric shock or fire.
  • Page 4 THE BOX II Owner's manual Do not place the equipment blocking ventilation outlets from other equipment. CLEANING: Disconnect the appliance from mains before cleaning it. Use a clean and dry cloth. Do not use aggressive cleaning chemicals, as glass cleaners, because it could damage painting.
  • Page 5 THE BOX II Owner's manual Thank you Thank you very much for purchasing a QHW Audio product designed by sound lovers for sound lovers and congratulations for your intelligent decision. This is an electronic instrument designed for accomplish its task with great precision and fidelity for many years.

  • Page 6: Rear Panel Description

    THE BOX II Owner's manual Rear panel description 1. DC power input. 2. Audio RCA inputs. 3. Audio RCA outputs.

  • Page 7: Installation And Connections

    Connect outputs form equipment sourcing signal to The Box II input to the input terminals [number 2 in description drawing] in the device rear panel and paying attention to channels LEFT and RIGHT order.
  • Page 8 THE BOX II Owner's manual its signal to, paying attention to channels LEFT and RIGHT order. Following drawings show a generic connection schema and some examples for setting up The Box II in your system:...
  • Page 9 THE BOX II Owner's manual...
  • Page 10 THE BOX II Owner's manual...
  • Page 11 THE BOX II Owner's manual...
  • Page 12 THE BOX II Owner's manual The Box II comes with an external DC power supply with can handle an input from 100 V to 240 V AC from 50 to 60 HZ and gives an output of 36 V of DC with a maximum of 1 A of current.

  • Page 13: Setting Gain

    QHW Audio uses safety earth and must be connected to an outlet which provides it. If cable included with The Box II does not fit your region plug, you will need one complying with IEC60320 C14 in The Box II external power supply end.
  • Page 14 Gain goes as described in table: GAIN 0.8 dB 3 dB 6 dB 9.5 dB 12 dB Rest of positions are not officially supported, nevertheless The Box II will sound and work without any problem with values of gain between or above the listed ones.

  • Page 15: Operation

    Owner's manual You can set gain with The Box II powered on or off. If volume is too high or The Box II is connected to a very sensitive power amplifier, small noises can be heard when switching gain at...
  • Page 16 THE BOX II Owner's manual transistors at its outputs because a precise DC servo keeps starting up “thumps” under control. It is not needed you power off The Box, its consumption is low, lower than 9 watts and is protected against overcurrent and overvoltage from mains.

  • Page 17: Troubleshooting

    THE BOX II Owner's manual Troubleshooting Frontal LED does not light.  Check DC power cable is firmly set.  Check mains cable of external DC power supply is firmly set into supply.  Check, plugging another device, that the mains outlet has current.
  • Page 18 THE BOX II Owner's manual A loud or annoying hum is heard.  Check all audio cables are firmly put in their terminals.  Try another cable, it may be some damage not visible in an apparently right cable, create distortion and strange noises.

  • Page 19: Technical Specifications

    THE BOX II Owner's manual Technical specifications Input impedance: 50 KOhm Output impedance: 10 Ohm Maximum output level: 9.5 V RMS Residual noise: < 1 uV RMS (input terminated with 47 Ohm) Signal to noise ratio (referred to 1 V RMS): 126 dB or better EIN: <...
  • Page 20 MADE IN SPAIN. © 2021 Quality Hi-Fi Works Audio, S. L. Puerto Serrano, 12. 28045 Madrid. Tel: +34 912794129 email: info@qhwaudio.com THE BOX II - Owner's manual - ver. 1.0.1 EN – 290521 - Specifications subject to change without prior notice.

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