Table of Contents
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Table of Contents
Summary of Contents for NIIMBUS ULTIMATE Series
- Page 1 HEADPHONE AMPLIFIER NIIMBUS ULTIMATE SERIES HPA US 4+ USER´s MANUAL...
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Page 3: Table Of Contents
Content Theme Page About NIIMBUS Safety Instructions The Earth / Grounding Concept Connection / Connectors General Remote Control Block Circuitry Operation About PRE-GAIN 14 / 16 Software Things to know Disposal Technical Data Dismantling Jumper Settings Conformity Statement Warranty CAUTION !! -
Page 4: About Niimbus
Any technical questions or need for advice is welcome. is a subsidiary of www.lake-people.de LAKE PEOPLE electronic GmbH www.lake-people.com Turmstrasse 7a www.NIIMBUS-audio.de D-78467 Konstanz www.NIIMBUS-audio.com www.violectric.de Fon +49 (0) 7531 73678 www.violectric.com Fax +49 (0) 7531 74998... -
Page 5: Safety Instructions
General Safety Instructions WARNING For your protection, please read the following: Water, Liquids, Moisture: This appliance should not be used near water or other sources of liquids. Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. -
Page 6: The Earth / Grounding Concept
Service / Repair: To reduce the risk of fire or electric shock, the user should not attempt to service the appliance beyond the measures described in the operating manual. All other servicing or repair should be referred to qualified personnel !! VOR DEM ÖFFNEN NETZSTECKER ZIEHEN!! PULL MAINS BEFORE OPENING!! AVANT D´OUVRIER... - Page 7 General GROUND-LIFT Jumper ( accessible from the inside. Mind the SECURITY INSTRUCTIONS !! ): Ex-works this jumper is set to the LIFT position. The internal ground potential is “lifted” by means of this jumper. As a result, the interconnection for DC voltages and lower frequencies (< 150 Hz) will be cut. Higher frequencies will be bled off to earth potential through the RC filter.
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Page 8: Connection / Connectors
Connection / Connectors for Analog Signals... -
Page 9: General
THE CASE of NIIMBUS HPA US4+ is made of 2 mm sheet steel and a thick 10 mm aluminium front panel. This choice of material ensures high mechanical stability and resistance whilst maintaining a high... - Page 10 GROUND AND PROTECTIVE EARTH The case of NIIMBUS HPA US 4+ is connected to protective earth. POWER SUPPLY Mains power is provided via a three-pin IEC/CEE socket and mating "cold-appliance" mains cord with Schuko-type plug for units purchased in middle Europe.
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Page 11: Remote Control
THE REMOTE CONTROL FOR NIIMBUS HPA US 4+ Function This remote control sends out infrared rays. For that purpose there is a infrared LED on the front. The remote control should point in direction of the target device to obtain best functionality. -
Page 12: Block Circuitry
Block circuitry NIIMBUS HPA US 4+... -
Page 13: Operation
THE POWER-SWITCH The unit is put into operation by means of the power switch. Power-on status is indicated by the white “ON” LED. The power-on procedure takes about 5 seconds. During this time the “STATUS” LED is red and turns white when all internal parameter checked. -
Page 14: About Pre-Gain
SELECTING / ACTIVATING AN INPUT With the “1 - XLR / 2 - RCA / 3 - RCA“ buttons on the front panel of NIIMBUS HPA US 4+ one of three analogue inputs can be activated. The corresponding LED is illuminated. - Page 15 THE VOLUME ATTENUATOR is to set the desired volume for the left and right channel simultaneously. Volume can also be set via your remote control. For this purpose, the volume control is actuated by a servo motor. Manual operation of the knob at the same time is possible without the risk of damage (although not useful…).
- Page 16 WE CALL THE SOLUTION TO THIS PROBLEM A single amp of NIIMBUS HPA US 4+ has no gain but an attenuation of -4 dB (about 60 % of the input signal). In case a balanced headphone is connected two amps are active with a combined gain of +2 dB (about 140 % of the input signal).
- Page 17 THE INPUT PRE-GAIN SETTINGS Ex works all switches are set to the lower position. Ex works setting So, if you share the opinion that your amp could act a bit softer you may set the “-6 dB” and or “-12 dB” dip switches to “ON”...
- Page 18 For both ways simultaneously the mute may be released by pressing the “MUTE” button on the remote control again. THE BALANCED HEADPHONE OUTPUT NIIMBUS HPA US 4+ Balanced Headphone Socket Pin-Out: offers a dedicated headphone output Pin 1 (+) Left channel to connect balanced headphones.
- Page 19 THE LINE OUTPUTS THE UNBALANCED LINE OUTPUTS are located on the rear panel of the unit and are marked as “UNBAL OUT LEFT” and “UNBAL OUT RIGHT”. Gold-plated full metall premium RCA connectors are implemented here. THE BALANCED LINE OUTPUTS are located on the rear panel of the unit and are marked as “BAL OUT LEFT”...
- Page 20 Of course you may alter the output level by using the line-out dip-switches. If you like to operate you NIIMBUS HPA US 4+ as pre-amp device of outstanding quality to drive some active speakers or power amps, than “VARIABLE OUT” or “POST-FADER” is the weapon of choice.
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Page 21: Software
SOFTWARE Some helpful parameters are adjustable via software. If you are lost in the menus you may RETURN TO THE DEFAULT SETTINGS by pushing the “1 - XLR“ button for some seconds during powering on. All LEDs are illuminated as long as the “1 - XLR" button is pushed. After releasing the button the unit is set to default state. -
Page 22: Things To Know
2 - RCA off Address 0, remote functions switched off 3 – RCA off 1 - XLR on 2 - RCA off Address 1, NiiMBUS remote "Headphone Amp“ DEFAULT !! 3 – RCA off 1 - XLR off 2 - RCA on Address 2, reserved 3 –... - Page 23 Which advantages do balanced signals offer ? In contrast to unbalanced signals, balanced signals are carried by two wires (plus ground/shield). In the transmitting device, a balanced signal is created by generating an inverted original signal (180ˆphase shifted). The "hot" wire carries the original signal (a), the "cold" wire the inverted signal (-a). In the receiving device, the balanced signal is processed by a differential amplifier, which detects the difference between both: (a) –...
- Page 24 Why does frequency bandwidth limiting make sense ? In signal processing, sound is represented by AC voltages. Sound is audible - for young people - from about 20 to 20000 Hz. The elder the listener, the less he will hear high frequencies in particular. In order to transmit these frequencies at optimum quality, the frequency response of an amplifier should be as wide and as "flat"...
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Page 25: Disposal
Why are high supply voltages essential ? A headphone doesn't really require high power, but from the equation P = U / R we can see that the square of the supply voltage determines the power into a given load resistance. The higher the headphone's impedance, the more voltage will be needed to achieve high listening levels. -
Page 26: Technical Data
TECHNICAL DATA NIIMBUS HPA US 4+ All values RMS unwtd., 20 Hz - 20 kHz, Pre-Gain set to 0 dB Input Parameter Inputs (stereo, analogue): 1 x XLR female, balanced 2 x RCA, unbalanced Max. input voltage: + 21 dBu... -
Page 27: Dismantling
Dismantling / Jumper Settings Please note: In the following, the internal settings of the HPA US 4+ are discussed. For changing these, a TORX T10 screwdriver is required and you should by all means PULL THE MAINS PLUG !!! Only thereafter the settings can be altered without any hazard. Dismantling 1. -
Page 30: Conformity Statement
EC CONFORMITY STATEMENT We herewith declare that the following unit NIIMBUS HPA US 4+ Name: Serial No. : -all - is in conformity with the following EC directives: 2006/95/EG Low voltage directive 20014/30/EC EMC directive EN 60065:2002+A12:2011 Security directives for audio-,... -
Page 31: Warranty
WARRENTY Since 1986 we are constructing and manufacturing sophisticated electronics for ambitious customers. Since the early beginnings we are trying hard by accompanying measures, the use of 1st choice components and multiple quality checks during production to avoid faults at large. We are quite effective in that and this is –...