MANUAL ADM20 REFERENCE- STUDIOMONITOR ACTIVE DIGITALE. Gesellschaft für digitale Studiotechnik mbh Specialists for Digital Studio Technology

Transcription

1 MANUAL ADM20 ACTIVE DIGITALE REFERENCE- STUDIOMONITOR Gesellschaft für digitale Studiotechnik mbh Specialists for Digital Studio Technology

2 KSDIGITAL GESELLSCHAFT FÜR DIGITALE STUDIOTECHNIK AM DÖRRWALD EPPELBORN (DI) INFO@KSDIGITAL.DE FURTHER INFORMATION AVAILABLE AT: STAND:

3 INHALTSVERZEICHNIS 2 CONTAKT 3 CONTENTS 4 SOUNDS RIGHT IN ROOM AND TIME 5 KSDIGITAL - FEATURES OF THE ADM - FAMILY 6-8 ADM20 - HOW IT WORKS 9 ADM20 - REAR VIEW / CONTROLS 10 ADM20 - DIAGRAMS 11 ADMW - THE THIRD WAY 12 CONNETCIOS 3

4 SOUNDS RIGHT IN ROOM AND TIME KSDIGITAL GESELLSCHAFT FÜR DIGITALE STUDIOTECHNIK MBH KS DIGITAL SPECIALIST FOR DIGITAL STUDIO TECHNOLOGY For more than 20 years, KS has created world class sound transmission devices and has always followed one aim; the reproduction of genuine and natural sound. KS products can be found in the inventory of the most illustrious operas, such as the Semperoper in Vienna, the Alte Oper in Frankfurt, Schauspiel Frankfurt, Kammerspiele in Munich or also in the Houses of Parliament in Berlin etc., as well as in the sound studios of top artists like Stevie Wonder, Herbert Grönemeyer, Xavier Naidoo / M. Herberger and many more. Naturally, you will also find our products in many radio stations in Germany like SWR, SR, Hit-Radio FFH and also around the world as well as in many famous mastering studios. The guiding principle for the design was the ultimate aim of sound neutrality that has made the ADM products an incorruptible tool in judging acoustic reproductions coupled with wonderful speakers to enjoy the results of those efforts. Many innovative ideas and patented processes have been developed by Ksdigital to get as near as possible to the original. We developed the FIRTEC technology a digital phase compensation filter for the studio loudspeaker system (cabinet and electronic components), with our dipole bass we have achieved a directional radiation, with DMC we have built a linear phase and zero latency cone loudspeaker and with NeXT we have introduced a new technology that, especially in the area of mastering, has brought the ear even closer to the sound and revolutionized acoustic radiation. You have made a superb choice in buying an ADM product from KSdigital and we congratulate you on your purchase and wish you endless enjoyment with the equipment. ATTENTION TO THE FINEST DETAIL During the development of the ADM family of products, we paid special attention to the correct timing of the radiated acoustic signals. When an impulse is correctly radiated with zero latency, this is equivalent to a linear frequency and phase characteristic. The highly responsive drivers we use, that have been manufactured in Germany according to our own, high specification, combine with the speed of the utilized MOSFET technology in our amplifiers and the FIRTEC digital equalization (ADM20) in an almost ideal way to achieve our goal of sound neutrality. (ew) : beim Patentamt München eingetragenes und geschütztes W arenzeichen 4

5 KSDIGITAL FEATURES OF THE ADM PRODUCT FAMILY All products of the ADM family are compatible with each other. In this way it is possible to combine the ADM 20 or ADM 30 with the ADM W or operate them together in a 5.1 Surround setup. ANALOG INPUT: Symmetrical XLR input (20dBu head room) with a bypass connector to connect the ADM W. A blue LED indicator on the front warns of possible overloading. DIGITAL INPUT: FullScale results in full volume. Warning, when connected directly to FullScale level such as the output of a CD-player, use the remote control to adjust the volume! INPUT CONTROL: If the 3dB Fs limit is exceeded (-3dB under the overload limit), the blue LED on the front will blink until the 3dB limit has been reached again. This ensures that you can listen in safety and that overload distortion caused by levels above the FullScale limit is eliminated. In case the FullScale level is accidentally exceeded, a built-in limiter intercepts a dangerous overload and prevents the destruction of the loudspeaker s driver. INPUT SWITCH: A dial at the rear of the cabinet enables the user to browse through a menu with a number of adjustment parameters. If a parameter needs to be adjusted, this is possible by pressing the dial and rotating it until the required value has been set. In this way, under Digital In Left or Digital In Right the required input data can be chosen for the signal processor of the DSP. If both inputs are activated, then a mono signal is generated and reproduced. REMOTE CONTROL: The remote control permits a control of the volume from your work area without a reduction of the word length of the input signal. There are 3 types of remote control: - per PC with remote control software This permits access to all signal processing parameters that can also be adjusted with the dial on the rear panel of the cabinet. - per analogue hardware controller This is connected to the loudspeaker and drives a VCA input signal to control the amplification of the output stage. -per digital hardware controller In the same way as the PC software, this permits access to all signal processing parameters that can also be adjusted with the dial on the rear panel of the cabinet. 5

6 ADM20 THE REFERENCE CREATED BY DIGITAL PRECISION The ADM20 is an active, two-way studio monitor for medium to high volume levels. The signal processing, including equalization, crossover and correction of the transient behaviour of the components, is completely done at the digital level. A connection to an existing, digital studio environment can be made digitally using the AES3 interface. An analogue feed is however, also possible; a high quality 27 bit gain staging, sigma-delta Converter with 64 x oversampling and a dynamic of more than 130 db is responsible for the conversion. The digital signal is further processed by a fast 60 MHz floating point Sharc DSP in our proprietary designed processor board. This converts the 24 bit wide input data into a float word with 32 bit mantissa and 8 Bit exponent that theoretically allows a dynamic of over 1500 db; noise from overloading, scaling and rounding off are therefore eliminated. A patented system (Pat. Nr: ) raises signals with a word width of less than 24 bits to an audiophile level. Parameters that can be externally adjusted, such as volume, filter etc., work directly at the floating point level in the process so that also at this stage, e.g. when adjusting the volume, no scaling errors occur. On the output side, the DSP works with two 24 bit D/A converters feeding the high performance MOFSET output stage, that is equipped with individually selected transistors. With a bandwidth of 100kHz and a rise time of 80 V/us, the output stage performs to 100W in treble range and 200W at deep mid-range. The resulting sound pressure is 116dB cont. and 122dB peak. SPECIFIC FEATURES OF DIGITAL SIGNAL PROCESSING Digital signal processing must meet the following requirements: - Separation of the relevant signal parts into treble and bass/ mid-range as well as the 3 rd way on the analogue output socket - Equalization of the transmission behaviour of each component - Overload protection function Every analogue interference with the signal, - e.g. insertion of a cross-over filter or equalization of individual speakers - causes not only the desired change but also a change to the impulse behaviour of the system. Analogue equalization would inevitably lead to a short impulse being smudged along the time axis and create a later oscillation of the impulse response at the end of the equalization. Additionally, an impulse would, in turn, cause a further oscillation due to the inertia of the membrane. Putting these together cause a deformation of a right-angled input signal to a less related output signal characteristic. The FIRTEC equalizer (Finite Impulse Response) which was developed for and is used in the ADM20, is free of those distortions described above. 6

7 On the contrary, the FIRTEC actually allows the processing of the Laufzeit time lapse / run time as well as the frequency characteristic. The correction of the input signal takes place in real time by folding the input signal with the impulse response of the equalization filter. As opposed to analogue technology, (that would try to correct the frequency characteristic with various filters thereby worsening the impulse accuracy) the equalization of the ADM20 works with a direct manipulation of the input signal to ensure absolute accuracy of the impulse this is physically identical with a linearization of the frequency characteristics in Betrag value and phase. Overall, a correct impulse behaviour is responsible for an apparent sound width (spaciousness), bass differentiation and a correct localisation of the instruments in the room. FREQUENCY CROSSOVER OF THE ADM20 The frequency crossover in the ADM20 works with a differential filter using FIR technology. The high frequencies are determined as the difference between the input signal and the bass signals this guarantees that there is always an ideal addition in the area between high and low frequencies. At the same time, the geometric misalignment of the moving coils of both drivers is exactly compensated utilizing a run time circuit. When combined with the newly designed sound direction principle of the tweeter, that ensures a planar wave at the sound opening, an optimal radiation characteristic is guaranteed. The frequency crossover s slope steepness of ca. 90 db /Octave ensures no interference when listening in front of the speaker. EQUALIZATION OF THE ADM20 To ensure the best possible equalization of the whole system, the FIR filter works on both tweeter and bass (complete filter) including therefore, the transition band between both. The measurements required to adjust the FIRTEC coefficients, take place on the complete speaker system, including crossover set-up of the drivers, so that the corrections include the complete geometry of the system. This procedure allows an individual calibration of the system after local installation. This means that any peculiarities of the monitoring room can be adjusted for in the configuration of the FIRTEC equalizer. The factory default settings of the FIRTEC filter result from measurements in an acoustically inert room whereby each individual (!) driver is calibrated. In this way, all manufacturing tolerances have already been compensated for in the calibration. Of course, the perfect impulse reproduction is supported by all utilized drivers. With a Qts of the mid-/bass speaker of 0.24 long stroke and high driving power, is a distortion free reproduction of the loudest impulse peaks guaranteed just in the same way as with the 44mm membrane diameter of the ring-radiator tweeter. 7

8 SOUND RADIATION Just as important as a correct amplitude and phase in the frequency characteristic is an exact sound radiation, where the acoustic energy is radiated uniformly across the complete frequency range. The new principle of directing the sound of the tweeter, guarantees a planar wave at the sound opening. The built-on wave-guide then bundles the radiated sound in exactly the same way as the midrange/bass speaker does in its transition band to the tweeter, guaranteeing a constant radiation behaviour at the crossover frequency. The driver of this tweeter, which is capable of high sound pressure, works with a membrane in ring form. Opposed to normal dome speakers, usually found in hifi and studio systems, this enables the tweeter a distortion free reproduction of impulse peaks even at very high volumes. The result of the correct digital equalization is neither corrupted nor nullified by the drivers components. In case of a complete overload of the input signal, utilization of a limiter in each path protects the components from destruction. THE 3 RD WAY A special feature of a two-way loudspeaker is the three-way processing of the signal. In addition to the two-ways which are fed to the drivers via the built in amplifiers, the DSP of the ADM20 calculates a third way in order to reproduce the bass range. This extends the bass range to the lower frequency limit of 25 Hz. This bass signal can be accessed at the analogue output socket and be connected directly to the ADMW. If the ADM20 WooferMode in the parameter menu is turned to ON, then this output will be switched from bypass to ADM equalization. Thereby, all frequencies under 100Hz are redirected to the ADMW which naturally contributes to relieving the 8 drivers. Therefore, the combination of the ADM20 and ADMW not only reaches the lowest frequencies but can significantly increase the volume of higher frequencies. Spitzenabhörlautstärke. The signal at the analogue output socket can naturally also be adjusted from the remote control. 8

9 Parameter adjustment dial with two-line display Digital IN, OUT Analogue IN, OUT Remote Control OUT Remote Control IN Main switch Fused mains socket 9

10 Impulse respons without FIRTEC process Impuls response after FIRTEC process Frequency of ADM20 wthout FIRTEC (green) Frequency of ADM20 with FIRTEC (red) Phase response of ADM20 wihtout FIRTEC (green) Phase response of ADM20 wiht FIRTEC (red) 10

11 ADMW THE THIRD WAY In connection with the ADMW, the three-way combination of ADM20 / ADM W forms a perfectly matched studio monitor, that can effortlessly reproduce very high volumes across the whole transmission range from 25Hz to Hz. With its connection at the analogue output socket of the ADM20 where the corrective signal processing takes place, the ADMW is an integrated component enabling all possibilities of parameter control such as filtering, volume, digital connection etc. The KS MOSFET output stage with its ca. 500 Watt, offers enough reserves for the deepest and fullest bass, distinguishing itself with a lively impulse. In this way you can enjoy the bass section just as it was recorded with no artificial bass generated by the loudspeaker itself. To connect the ADMW to the ADM20: - turn Woofer Mode to ON (Parameter menu of the ADM20) - connect the analogue output socket with the ADMW OVERVIEW OF THE TECHNICAL SPECIFICATION OF THE ADM W Connection via the Analogue OUT socket of the ADM20 Analogue IN, OUT: Room Equalization: Drivers: Output Stage: Sound Pressure: XLR-symmetrical, active bypass connector per DSP in ADM20 2 x 10 high performance speakers 400 Watt MOSFET technology 122dB cont. / 128dB peak (ADM20/W Stereo set-up) Dimensions (ADM W): 65 x 30 x 90cm 42Kg 11

12 DIGITAL CONNECTIONS The ADM20 utilizes different left and right loudspeaker cabinets. The differentiation is simple due to the different geometry of the speakers. The right speaker has the name plate with the blue LED on the right, the left speaker s is on the left. The different geometry is due to the directional optimisation. In this position, the tunnel not facing the listening position, causes far fewer reflections. In a studio environment, a digital connection is made by connecting the AES signal with the Digital IN socket of the right speaker. The left speaker is connected to the active Digital OUT socket of the first speaker. The digital source must be connected to the speaker with the right digital In in paramter menue. Bild1: Right ADM20 Speaker OVERVIEW OF THE TECHNICAL SPECIFICATION OF THE ADM20 AD / DA: Digital IN, OUT: Analogue IN, OUT: DSP: Process: 27 bit gain staging sigma delta, 64x over-sampling AES3 Format, KHz XLR symmetric, active bypass connector XLR symmetric, active bypass connector with signal selection High performance Sharc Processor 60 MHz, 32 bit floating point, 1500dB dynamic 1500 db dynamic FIRTEC equalization, FIR crossover limiter, preset equalization, user defined equalization, digital floating point, volume control, deflection protection Room Equalization: Drivers: Output Stage: Sound Pressure: Remote Control: Dimensions: 2 x FIRTEC preset, low and high shelving, 3 x parametric EQs, phase shifting 2 ring radiator, 8 carbon bass 200W + 100W MOSFET technology 116dB cont. /122dB peak optional, with gain control and input switch. 42 x 30 x 33 cm 19.7Kg 12

13 ADM20 DIGITAL CONNECTION, REMOTE CONTROL digital source to RC socket of next ADM20 Remote Control to next ADM20 Digital IN in connetcion with ADMW: - to Analogue -In Buchse ofs ADMW - Woofer Mode in menue of: ON 13

14 Description Function Range of Values Volume Total volume 0dB -31dB Filter 1 Frequency X/26 Frequency band of Filter 1 27 frequency bands Gain Relative level of the correction filter +6dB -6dB Q-Factor Frequency bandwidth 0.1,, 5.0 Filter 2 Frequency X/26 Frequency band of Filter 1 27 frequency bands Gain Relative level of the correction filter +6dB -6dB Q-Factor Frequency bandwidth 0.1,, 5.0 Filter 3 Frequency X/26 Frequency band of Filter 1 27 frequency bands Gain Relative level of the correction filter +6dB -6dB Q-Factor Frequency bandwidth 0.1,, 5.0 Low shelving 80Hz EQ +6dB -6dB High shelving 12kHz EQ +6dB -6dB Distance shift Speaker delay In meter Subwoofer Switches between 20Hz and 35Hz fgu Active / Not active Phase reversal Phasing shift of 180 Active / Not active Digital In Left Turns on left data word Active / Not active and turns off analogue input Digital In Right Turns on right data word Active / Not active and turns off analogue input Update FIR Filter Facilitates transfer of a new filter Active / Not active The 27 frequency bands (terz bands) appear in the display in the following order: 40 Hz, 50 Hz, 63Hz, 80Hz, 100 Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 800 Hz, 1000 Hz, 1250 Hz, 1600 Hz, 2000 Hz, 2500Hz, 3150 Hz, 4000 Hz, 6300 Hz, 8000 Hz, Hz, Hz, Hz.

15 PC Screen shot of the ADMControl Software