080422 MicAmp2 User Manual.cdr
Contents
1. JO9UUOD voneJjado psouejequn 104 indino pasuejeq AjjEIIU0A99 J Z J04 saw DIMWBU P SIU s mod zouf 1Eu sauoydoJoIN JO indu wojueyd UON dn AEA j99 1109 d0 uo s pu B AOL 1EU os pue J p ou asnj anoual Ajddns AOLL NOpz o jes lul 931 L DACS Using the DACS MicAmp2 Installation 1 Connecting the Power The unit will accept 240 VAC and 110 VAC mains supplies 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 U SS Set for 240VAC Set for 110VAC 2 Outputs The output from the DACS MicAmp2 is a fully floating electronically balanced output designed to drive down long 6000 lines It will run balanced or unbalanced and can provide signal levels in excess of 22dBm when running balanced or unbalanced To run unbalanced connect either pin 2 or pin 3 to OV NB The output will not run unbalanced satisfactorily if one leg is left floating and not connected to OV 3 amp 4 Inputs The DACS MicAmp2 has two microphone inputs one for phantom powered 48V microphones and one for non phantom powered microphones The non phantom powered input by passes the input capacitors and avoids the sig2. at very low levels there is never any graininess in the sound and that it is always clear open and detailed The noise performance may most usefully be expressed in comparison with an NE5534 the low noise IC used in most professional applications The MicAmp2 s noise is typically 16dB less even at maximum gain Compliance to European Standards This MicAmp2 complies with the following standards see Declaration of Conformity Radiated Emissions to Specification EN50081 1 Conducted Emissions to Specification EN50081 1 Electro Static Discharge to Specification EN50082 1 Fast Burst Transients to Specification EN50082 1 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 DACS 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 HeadLite2 a four channel headphone amplifier 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 circui
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4. M TWO CHANNEL MICROPHONE PREAMPLIFER Des icAmp2 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 MicAmp2 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 MicAmp2 is an ultra low noise microphone amplifier It uses three super matched pairs of transistors for the main gain stage giving low noise performance and very fine detail even at very low input levels The frequency response is flat down to below 1Hz at the bottom DC for non phantom powered microphones and does not start its tailored high frequency roll off until above 45kHz The CMRR is hand trimmed at mid and high frequencies to very high tolerances Each channel has an eight position self cleaning rotary switch to set gain in 6dB steps from 20dB to 62dBd There is then a gain trim from OdB to 10dB and a three position bass roll off filter giving a flat response and two cut off points at a nominal 80Hz and 30Hz The cut off point and slope of the filters have been chosen to give a smooth response while removing very low rumble 30Hz and more mains type noise 80Hz In addition they have no effect above their cut off frequency The balanced output is a fully floating servo type output with hand trimmed b
5. alance set to 1 accuracy delivering up to 22dB into 600R Working with the MicAmp2 is straightforward Settings are easily repeatable due to the stepped gain and detailed scaling on the trim control There is ultra fast protection on the input so that any fault condition immediately triggers the protection circuitry preventing damage to the amplifier circuitry 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 yulod Ho 1ND anoge 589104 Jo p y y SSILWIUILU O pajoajas u q sey anno Jolly y ZH08 JO ZHOE DUE lli YO 101 SSEQ S GPOL 490 9 0 GPO 490 9 0 9 Ayjiqeyeedes ASE JO snoy Meu pue Inoy y o ajeos gpo jo ule Buimoyje ull ules 7 330 apz9 21 o gpoz wou sd s gpg ul ule5 paddaj s 9 1108 3SJ9A9J O UMOP aSseud ul JO dN YOUMS BSeUd LL spuoyas N e 10 UO sureula pue WIPZZ EI DPEOH AO sino5o usym sajeulwnjj 1461 pEOL AO 1uBiiq 2111 OL UHE SUIELU wo pajejos A0 olpny S pay pue WIPG Je MO A WPS L Je s leuluunil uaa uoneulunil G37 ysuayul SONSII EG Wdd 1939W 37 juauBes 111 anbiup 6 pue z suid uo Jamod uojueyd UUM ndul wojueyd 2 NO o JO z uid
6. connected before the fuse so when itis illuminated this indicates that mains is present Ifthe unit does not work the fuse may be blown The unit comes with a spare fuse in the fuse carrier Replacement fuses should be T1A MIC 2 microphone 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 DACS Specifications for MicAmp2 Distortion THD N 1kHz lt 0 0016 1kHz with 10dB output and 60dB gain Self Noise 128dB DC 40kHz Cross talk lt 90dB Frequency response Phantom Power Flat lt 2Hz to ca 45kHz tailored roll off Non Phantom to ca 45kHz tailored roll off CMRR 50 2 typically 93dB 20d3B gain 984 62d3B gain 2 kHz signal typically 61dB 20dB gain 100dB 62dB gain 1Some of the factors which make the DACS MicAmp2 sound so good great detail depth and clarity in the sound with a wonderful easy quality to it as Calum Malcolm told us are not easily translatable into performance figures The three ultra low noise super matched pair transistors on the input stage have a lot to do with it The microphone is connected directly to the input transistor array giving the correct load without the addition of other components which degrade the signal They are current devices so there are always lots of electrons moving around We believe that this is the reason why even
7. mise the pick up of unwanted rumble and to have little or no effect on the signal above the roll off frequency The slope of 12dB octave and cut off frequency were selected to minimise very low earth borne rumbles 30Hz cut off and more buzzy mains type noises 80Hz cut off The filter has no effect on frequencies above the cut off and causes no bumps in the frequency response 9 amp 10 Metering The signal level and condition is show by the unique tri segment LED meter and the ultra bright overload LED The segments of the LED meter illuminate increasingly brightly as the signal level increases with the Green LED illuminating first to indicate that signal is present the Yellow LED illuminates at 5dBm achieving full brightness at 13dB when the Red LED begins to illuminate The Overload LED illuminates when the signal clips and remains on for a few seconds Calum Malcolm particularly like the meters he said that they gave him a really clear sense of what was happening wih the signal better even than PPMs 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 DACS 11 Phase Reversal switch This gold plated contact switch reverses the signal phase when it is down It has no other effect 12 Power switch This switches the power on and off and is illuminated when AC mains is present This switch is
8. nal degradation caused to low microphone voltages by switching the signal The microphone amplifier stage has a minimum gain of 20dB Before connecting microphones ensure that the MicAmp2 s gain is set to 20dB and that any loudspeakers are turned down 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 DACS 5 Earthing The signal OV is separate from the mains earth 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 wire from the earth tag This connection should only be made by qualified personnel if it is necessary Ifin doubt please call us 6 amp 7 Setting Gain The gain for the MicAmpll is set using the stepped GAIN control in 6dB steps and then trimmed between OdB and 10dB using the continuously variable TRIM control The scaling on the trim control allows accurate repetition of settings The main lines may be thought of as hours OdB is 6 o clock and 10dB is 3 o clock while the secondary lines are half hours The settings may then be remembered or noted down as times making it easy to repeat them accurately Optimum gain settings vary but see below for operating levels and overload indication ROLL OFF y e 80 8 The bass roll of is designed to mini
9. ts 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 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
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