080422 HeadLite2 User Manual.cdr
Contents
1. The IEC inlet s fuse holder is used as a selector as shown in Fig 2 The factory setting is for 240 VAC Figure 2 m SS Set for 240VAC Set for 110VAC 3 8 6 Outputs Connections The outputs are on three pole Y jack tip left ring right sleeve 0V They connected in parallel The output circuitry is designed to drive down long lines with minimal high frequency loss If you are sending headphones signals down long lines using screened twin conductor cable such as foil screened twin FST we would recommend using two separate cables if you can This would reduce any possible cross talk between the left and right channels There are installations we know of where left and right are sent down the two conductors and all reports have been good If two or more pairs of headphones are to be driven by an output they should be of the same type and impedance If they are different eg low and high impedance power sharing will not be even One will be too quiet and to achieve the required level in that pair the other pair will overload Remember that for headphone feeds the screen must be connected at both ends of the cable DACS LTD Stonehills Shields Road PELAW Gateshead Tyne and Wear NE10 OHW Tel 44 0 191 4382500 Fax 44 0 191 4382511 www dacs audio2. com sales dacs audio com DAS Levels The amplifier section can deliver up to 0 5W RMS per channel and has a fixed gain of 20dB The volume potentiometer varies the input level to the amplifier stage Too high an input level here will reduce the useful control over the output volume since it will have to be set very low to ensure that the output does not clip To adjust this level see below 3 7 Inputs Note on the problems of Loudness and Headphones Our amplifier cannot do the impossible We can only make headphones as loud as they are capable of being Beyond that they distort and clip which is very bad for your ears short and long term The problem usually is not so much that the headphones are not loud enough it is more that the sounds outside are too loud and are breaking through into your ears Approached from this direction the problem can be solved more easily 2 amp 8 Inputs Connections Inputs A and D are on three pole jack sockets tip signal ring and sleeve 0V Balanced signals may be used on three pole jack plugs with the screen removed at one end as per your earthing strategy or unbalanced signals may be used on two pole jacks The inputimpedance is 10k ohms If no connector is plugged in the inputs are shorted to OV the switch connections on the jacks If the inputs are connected to a patchbay it is advisable if possible to normalise them Do this at the patch bay unless they are
3. crystallised these years of experience to bring you this range of elegantly simple high performance units all hand made throughout Where they benefit performance we use expensive components and time consuming processes but do not spend prodigiously on cosmetics Though we are bucking the trend towards downsizing work forces and automating manufacturing processes these units are very competitively priced This is achieved by a combination of good design good organisation low overheads and the use of standard housings and other components where possible These visually striking well engineered devices will last well into this century achieving levels of performance that digital technology and much analogue technology aspires to today YOU are what make your studio world class Our equipment is designed to help you continue to produce fine music well into this century 1 We are proud to announce that the MicAmp won the Studio Sound Audio Industry Recognition Award in the Outboard Pre amp category This was voted for by registered readers of Studio Sound worldwide DACS LTD Stonehills Shields Road PELAW Gateshead Tyne and Wear NE10 OHW Tel 44 0 191 4382500 Fax 44 0 191 4382511 www dacs audio com sales dacs audio com
4. 1 1 Conducted Emissions to Specification EN50081 1 Electro Static Discharge to Specification EN50082 1 Fast Burst Transients to Specification EN50082 1 ELECT HEADPHONE OUT VOLUME INPUT SELECT a E T AA re Se cc N a o 6 NE AB a lt 5D HEAD 2 headphone amplifier DACS LTD Stonehills Shields Road PELAW Gateshead Tyne and Wear NE10 OHW Tel 44 0 191 4382500 Fax 44 0 191 4382511 www dacs audio com sales dacs audio com DAS Other Fine Hand Crafted Audio Products from DACS Ltd Clarity from DACS Ltd A new philosophy a new range of devices DACS range of high performance studio and stage devices embody our philosophy We believe in simplicity but above all else Clarity sonic Clarity and functional Clarity The range includes the DACS MicAmp2 a two channel microphone see also reviews in Sound on Sound and Studio Sound both November 1997 viewable on our website Our recently launched Aug 2006 Eightch an eight channel volume control won the Pro Audio Review PAR Excellence award For many years DACS have manufactured custom equipment for professionals the world over using a number of our own high performance audio building block circuits The performance of these circuits has been honed over the years out in the field and developed through fulfilling the changing professional requirements of their many customers in widely divergent sectors of the industry DACS have
5. FOUR CHANNEL HEADPHONE AMPLIFIER DAS ead Lite2 Instructions for use and installation Welcome At DACS we are very pleased that you have chosen to purchase one of our products We take pride in our work and are sure that this HeadLite2 will give you years of exemplary service If you have any suggestions or comments about this product please call fax write or e mail us with your thoughts Thank you Introduction The HeadLite2 is a four input four output headphone amplifier with a six position self cleaning monitor select switch for each amplifier It is designed to be as flexible as possible without introducing needless complexities The input buffering ensures a flat frequency response down to below 1Hz Its outputs are capable of driving virtually all headphones we know of none it has problems with The outputs are also designed to drive down long lines to cubicles with little or no loss of quality The unit is compatible with 10dBV and 4dBu inputs see next page 3 amp 7 Inputs For power users who require the ultimate power output we offer the Power modification which significantly increases in power output The Power modification is fitted to one channel as standard look for the blue cap but can be fitted to two three or all four channels of the HeadLite2 It has built in limiting soft clip to help protect low impedance headphones from burn out Additional power modifications can be retrofitted any time aft
6. e from the earth tag This connection should only be made by qualified personnel if it is necessary If in doubt please call us 5 Sensitivity Switches On the rear panel there are sensitivity switches for channels A amp B and C amp D This allows user selection of sensitivity as an operational control rather than having to be set with internal links 7 Volume Control The HEADPHONE VOLUME control adjusts the signal level going to the amplifier This control allows independent volume control of each output DACS LTD Stonehills Shields Road PELAW Gateshead Tyne and Wear NE10 OHW Tel 44 0 191 4382500 Fax 44 0 191 4382511 www dacs audio com sales dacs audio com DAS 9 Power This switches the power on and off and is illuminated when AC mains is present The switch is connected before the fuse so if the switch is illuminated and the unit does not work the fuse may be blown The unit comes with a spare fuse in the fuse carrier T1A The DACS HeadLite2 is now fitted with the ultra quiet regulated power supply as used in the DACS Micamp Specifications for HeadLite2 Distortion at 20dBm into 2200 lt 0 002 20Hz to 22 2 Signal to Noise A Weighted lt 124dB 20Hz to 22kHz Frequency response Flat 1Hz 20kHz Power output gt 200mW ch into 600R Compliance to European Standards This unit complies with the following standard see Declaration of Conformity Radiated Emissions to Specification EN5008
7. er purchase Please speak to your retailer or direct to us for details DACS LTD Stonehills Shields Road PELAW Gateshead Tyne and Wear NE10 OHW Tel 44 0 191 4382500 Fax 44 0 191 4382511 www dacs audio com sales dacs audio com JNOA UO JOMUOW O YSIM sjndul uONeUIqWIOO YSIYM 159195 0 SIU UOUMS 6 asn 1099195 indu 8 iy Wo eumedpoey als 2 gt FH 8 9 G jo 72 av3H en oo c o DO or sindino suoydpeay a pue JO O4JUOD Z Ul SJOWJOJJEd Jo sjeuueyo Jo sindno 9 x SYIIMS ANAINSUSS 9 yes WON a A0 55 oe ro ec 0000 z E 7 ALIS 2 9 amp pry s3va 5 55 Zu 5 2 919 dn 1991109 d0 s aie WOJ JO Aeqysyed Bulp J099 O 129 os pue Jepjoy A P ey sindino sno s ndu seuoydpesy uno 7 asnj Ajddns AOL 104 nt NOpz 91198 loj08y 93 OF DAS Using the DACS HeadLite2 Installation 1 Connecting the Power The unit willaccept 240 VAC and 110 VAC mains supplies
8. normalised and left floating they may be prone to pick up interference taxis or the radio over long lines between the unit and the patchbay Levels The input buffer s sensitivity can be adjusted for 4dBu or 10dBV operation using the switches Note Channel A amp B sensitivity are selected by one switch and Channel amp D sensitivity by the other It is not possible to select different sensitivities for the paired channels DACS LTD Stonehills Shields Road PELAW Gateshead Tyne and Wear NE10 OHW Tel 44 0 191 4382500 Fax 44 0 191 4382511 www dacs audio com sales dacs audio com DAS Listening With up to four inputs connected to the unit you can decide which headphone amplifier output you wish to use To select the input s you wish to listen to rotate the selector switch to the appropriate point AB means inputs A and B on the Left and Right output respectively AA means input A on both Left and Right etc Plug your headphones in and adjust the volume to an acceptable level INPUT SELECT 4 Earthing The signal OV is separate from the mains earth This separation allows us to run unbalanced with a large measure of immunity to hum problems since the amplifier is not referenced to or connected to any earth other than the signal source The mains earth is connected to the case of the device If you wish to connect the signal earth to the mains earth or a technical earth this may be done by running a wir
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