WHOLER监听音箱说明书

AMP1-SDA1U Digital Audio Speaker Monitorwith SDI Input and Loop-Through on BNCs,AES Digital Input on BNC, AES Output FromSDI on BNC, Two Analog Inputs on XLRs,Selected Stereo Analog Outputs on XLRs, Two26-Segment Level Meters, and Phase IndicationDocument P/N821531 Rev-BUser Manual© 2002 Wohler Technologies Inc. ALL rights reserved1© 2007Wohler Technologies, Inc. ALL rights reservedAMP1-SDA User Manual P/N 821531 Rev-BGeneral Featuresand SpecificationsDescriptionFeaturesApplicationsSpecificationsOther Options3© 2002 Wohler Technologies Inc. ALL rights reserved4© 2002 Wohler Technologies Inc. ALL rights reservedThe AMP-1 Digital series of audio monitors provides self-powered, full-fidelity stereo monitoring in the smallest rack space possible. All models in the AMP1 Digital series contain four high performance transducers driven by three power amplifiers: two amplifier/driver combinations handle midrange and high frequency information in stereo, while the third center channel reproduces information below the 500 Hz crossover point.All AMP1 Digital models come equipped with a ganged stereo volume control and balance pot, power indication LED, and headphone output. Output limiter circuits are incorporated to protect the speakers, and extensive magnetic shielding allows placement immediately adjacent to video monitors with no color impurities.The AMP1-SDA model features an SDI input and loop-through on BNC connectors, an AES input on an unbalanced BNC connector,an AES output (converted from the SDI input) on a BNC connector, analog inputs on two balanced XLR connectors, and a stereo analog output of the selected source on two XLR connectors. Toggle switches on the front panel allow selection of subgroup 1or 2(Channel 1/2 or 3/4) of the SDI input, SDI or AES input sources, and a choice of the selected digital source or the analog source inputs. Two red LEDs indicate the presence and error status of the selected AES and/or SDI signals entering the unit.Two high-resolution 26-segment tri-color LED bargraph level meters display the audio levels for the left and right selected sources.Wohlers proprietary three-LED stereo phase indication feature allows monitoring of phase relationships of the selected stereo inputs.AMP1-SD A1U Digital/Analog Audio Stereo Speaker Monitor• 98 dB SPL at two feet• Only one rack space high• Excellent high frequency response for positive detection ofbackground whine and noise• Audible and visual indication of phase/polarity problems• Thorough magnetic shielding for placement next to videomonitors• Two high-resolution 26-segment tri-color LED bargraphlevel meters• SDI input and loop-through on unbalanced BNC connectors• AES/EBU input on unbalanced BNC connector• Analog stereo inputs on two balanced XLR connectors• AES output (converted from SDI input) on BNC connector • Analog output of selected input on two balanced XLR connectors • SDI signal status indication LED • AES signal status indication LED • SDI subgroup 1 or 2 (of Group I.D. #1) source selection via front panel toggle switch • SDI/AES source selection via front panel toggle switch • Digital/analog source selection via front panel toggle switch • Headphone output • Power indication LED • Numerous control and input options • Quick and easy installation: simply slide in the rack and connect audio and AC powerThe AMP1 Digital series is ideally suited for use in VTR bays, mobile production vehicles, teleconferencing installations, multimedia systems, satellite links and cable TV facilities, and on-air radio studios. Designed and manufactured in the U.S., the AMP1-SDA is backed by a strong warranty and a satisfaction guaranteed return policy.AMP1-SDA Front PanelCE. 0 dbV ref. 0.775V RMS. Features and specifications subject to improvement without notice.5© 2002 Wohler Technologies Inc. ALL rights reserved6© 2002 Wohler Technologies Inc. ALL rights reservedAMP1-SDA User Manual P/N 821531 Rev-BInstallationFront Panel FeaturesRear Panel Features7© 2002 Wohler Technologies Inc. ALL rights reserved8© 2002 Wohler Technologies Inc. ALL rights reservedMountingNOTE: If you wish to set the AES Input Termination, AES Status Error Type, AES Input Level Gain, Line Level Calibration, Meter Gain Calibration, and/or Bargraph Display Mode via the DIP switches (accessed on the rear panel) be sure to do so BEFORE installing the unit into an enclosed rack or console. See pages 12 and 14 for setting information.The unit should be mounted where convenient for operating persons, ideally at approximately ear level for best high frequency response. Its superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including even high-resolution color monitors.Heat DissipationHeat dissipated by the speaker amps is conducted directly to the left side of the chassis; no special considerations for cooling are necessary as long as the ambient temperature inside the rack area does not exceed approximately 40°C (104°F).Sympathetic VibrationSympathetic vibration from other equipment (cables, etc.,) in the rack may be serious enough to interfere with the unit’s sound quality out in the listening area. The use of thin card stock and/or felt or foam weather-stripping type materials between adjacent vibrating surfaces, or tying up loose cables, etc., may be required to stop vibrations external to the unit.Mechanical BracingEven though the unit is fairly heavy, the chassis is securely attached to the front panel at eight points along its surface, not just at the four corners of the chassis ears. This feature will reduce or eliminate rear bracing requirements in many mobile/portable applications. The weight of internal components is distributed fairly evenly around the unit.Audio ConnectionsConnection of the audio feeds is straightforward. Please refer to the system interconnect block diagram on page 22 for clarification of the general signal paths into and out of the AMP1-SDA unit.For digital inputs, Impedances are 75 Ω for the unbalanced BNC connectors and 110 Ω for the balanced XLR connectors. Analog inputs have an impedance of 40k Ω for the balanced XLR connectors.Care should be exercised to avoid mismatched cable types and other similar causes of undesired reflections in RF signal systems.Electrical InterferenceAs with any audio equipment, maximum immunity from electrical interference requires the use of shielded cable; however, satisfactory results can sometimes be obtained without it. The internal circuitry common is connected to the chassis.AC PowerThe unit's AC mains connection is via a standard IEC inlet, with safety ground connected directly to the unit's chassis. The universal AC input (100-240VAC, 50/60H z) switching power supply is a self-resetting sealed type, with automatic over-voltage and over-current shutdown. There is no user-replaceable fuse in either the primary or secondary circuit.9© 2002 Wohler Technologies Inc. ALL rights reservedPlease refer to Figure-2a on the following page to familiarize yourself with the front panel features of the AMP1-SDA unit. The following sections describe these functions and are referenced, by number, to Figure-2a.1 SpeakersThe AMP1-SDA internal speaker system is comprised of two mid-range speakers (left and right) and two woofer speakers (left and right). The two mid-range speakers reproduce, in stereo, only the mid and high frequencies, while the two woofer speakers monorally reproduce the low frequencies.2Volume Control - Rotary PotThis controls the loudness of the audio reproduced by the internal speakers or connected headphone.3 Headphone Output - 1/4" JackWhen you plug in headphones, the internal speakers will mute. This jack accepts a standard 1/4” phone type stereo plug. 4Power Indication - Green LEDThis LED glows green to indicate the AMP1-SDA is connected to operational mains power.5Phase Indication - Bi-Color LEDs (red/green)These three LEDs offer instant visual verification of phase (polarity) conditions in the pair of channels selected for monitoring in the Left/Right channel speakers. The two smaller LEDs, labeled Φ+andΦ-(above and below), show instantaneous phase relationships in the signal, while the larger LED, labeled "A VG" (center), indicates the average phase condition.The small Φ+ LED (top) glows (or blinks) green when signals are in-phase. The small Φ- LED (bottom) glows (or blinks) amber for out-of-phase signals. The larger A VG LED (middle) indicates the average phase condition by glowing green for in-phase conditions, or red for out-of-phase conditions.In general, it is sufficient to regard the A VG LED (average phase condition) as adequate for proper phase monitoring. While it is normal for stereo signals to contain some intermittant instantaneous out-of-phase and in-phase conditions (small LEDs),a steady red glow of the larger LED almost always indicates an out-of-phase alarm condition.6 Audio Level Meters - 26-Segment LED Bargraph DisplaysAudio levels for the selected input sources are displayed via these two 26-segment tri-color (green, amber, red) LED bargraph display level meters. These two bargraph displays are user adjustable for Line Level Calibration,Meter Gain Calibration, and Bargraph Display Mode via a DIP switch on the rear panel. See Item H on page 14 for more information regarding the level meter DIP switch location and settings.7 Bargraph Brightness Adjust - Recessed Trim PotThis control is recessed into the front panel and can be accessed using a small flathead screwdriver. Turning the trim pot clockwise will simultaneously increase the relative brightness of the LED segments in both bargraphs.8 SDI Signal Status Indication - Bi-Color LED (Green/Red)This LED indicates the status of any SDI signal entering the unit regardless of any monitor selection settings. This LED is OFF when no valid SDI signal is present, GREEN when a valid signal is present, or RED when the signal is not properly received or audio is not de-embedded.9 AES/EBU Signal Status Indication - Bi-Color (Green/Red) LEDThis LED indicates the status of any AES signal entering the unit regardless of any monitor selection settings. This LED is GREEN when a valid signal is present, or RED to indicate errors. There are two DIP switch selectable modes of fault detection that will create a RED LED error indication. See Item C, page 12 for more information about this setting.10SDI/AES Source Select - 2-Position Toggle SwitchThis switch selects between the AES and SDI input sources (Item E, page 12 and Item G, page 14). However, to monitor either of these selected digital sources, the Analog/Digital Source Select switch (Item 12) must be set set to DIGITAL. 11SDI Group Select - 2-Position Toggle SwitchThis switch selects between GROUP 1 (subgroup 1, channels 1/2) and GROUP 2 (subgroup 2, channels 3/4) to be monitored within the SDI input stream. All available subgroups/channels are derived from SDI Group I.D. #1.12Analog/Digital Source Select - 2-Position Toggle SwitchWhen this toggle switch is set to ANALOG, the unit will monitor the analog input signals from the ANALOG IN XLR connectors on the rear panel (Item B, page 12). When this toggle switch is set to DIGITAL, the unit will monitor the digital source (SDI or AES) as selected by the SDI/AES Source Select switch (Item 10).13Balance Control - Rotary PotThis pans the volume balance between the left and right speakers. If the balance is adjusted hard left or hard right, a slight left/right channel mix is retained (only in low bass frequencies) so that phase discrepancies can be audibly discerned.10© 2002 Wohler Technologies Inc. ALL rights reservedPlease refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the AMP1-SDA unit. Thefollowing sections describe these features and are referenced, by letter, to Figure-2b.A Power - IEC-320 ConnectorAttach a standard IEC-320 power cord between this connector and mains power (100 - 250VAC, 50/60 Hz). The front panel power LED (Item 4, page 10) will glow green to indicate operating voltages are present.B Analog Inputs (Channel A (L) and Channel B (R) - 3-Pin Female XLR ConnectorsThese two balanced (40k Ω) XLR connectors accept standard analog audio signals. The unit will monitor signals input on these two connectors when the Analog/Digital Source Select switch on the front panel (Item 12, page 10) is set to ANALOG .For XLR pinout information see the diagram at the bottom of page 14.C AES/EBU Termination and AES Error Fault Type - 4-Section DIP SwitchAES Input Termination: In the event that the AES input channel is fed to downstream equipment (via a "Y" or "T"connector), then DIP switch Section S2 must be placed in the Unterminated (UP ) position. If there is no downstream equipment connected, then Section S2 must be placed in the Terminated (DOWN ) position. See below left for diagram of termination settings.Note: Sections S3 (x) and S4 (Term 2) are not used.AES Error Indication Fault Type: There are two DIP switch selectable modes of fault detection that will create a red error indication in the AES/EBU Signal Status Indication LED;1) Reception errors: errors in reception of data or no data stream at all (S1=DOWN )or 2) Reception and data errors: errors in reception and data errors identified by the sending device (possibly invalid) (S1=UP ). See below right for diagram of AES error settings.Note: Sections S3 (x) and S4 (Term2) are not used.D AES Out (From SDI) - Female BNC ConnectorsThe AES/EBU OUT connector outputs an AES/EBU signal as converted from the SDI input and as selected by the SDI Group Select switch (Item 11, page 10). This connector is configured for an unbalanced, 75 Ω connection.E AES/EBU In - Female BNC ConnectorsThe AES/EBU IN input connector is meant to receive standard AES/EBU signals. This BNC connector is configured for an unbalanced, 75 Ω connection. Note that the unit will monitor the AES/EBU input only when the Analog/Digital Source Select switch (Item 12, page 10) is set to DIGITAL and the SDI/AES Select switch (Item 10, page 10) is set to AES .F AES/EBU Input Level Gain Calibration - 2-Section DIP SwitchInput Level Gain Calibration, the analog level which corresponds to a given digital input value, is settable via this DIP switch.The factory setting is +4 dB (analog) = -20 dBFS (digital). See the silk-screened chart on the rear panel or the diagram below for Gain Calibration settings.G SDI In and Out - Female BNC ConnectorsThe SDI IN input connector is meant to receive standard SDI signals. The SDI OUT loop-through connector outputs a reclocked (regenerated) copy of the signal entering the SDI IN input connector. Both connectors are configured for unbalanced, 75Ω connections. Note that the unit will monitor the SDI input only when the Analog/Digital Source Select switch (Item 12, page 10) is set to DIGITAL and the SDI/AES Select switch (Item 10, page 10) is set to SDI.H Level/Gain Calibration and Display Mode - 6-Position DIP SwitchThis DIP switch sets the Line Level Calibration, Meter Gain Calibration, and Bargraph Display Mode.Line Level Calibration: The unit is calibrated at the factory. To recalibrate:1)Turn on the power.2) Apply a reference level (nominal 0) signal to all four channels.3)Make sure the Gain Calibration DIP sections (S2,S3) are set to the nearest level (i.e., 0, +4, +6 or +8).4) Place section S1 of the DIP switch in the DOWN position.5) Wait 10 seconds. The unit will remove the previous calibration. The unit will make sure that all four channels are within+/- 4 dB of nominal zero. If all four channels are within this range then the new calibration will be applied. If any channel is outside this range then no new calibration will be applied.6) Place section S1 of the DIP switch in the UP position and return unit to service.If one wishes to calibrate again, turn off the power to the unit and repeat steps 1 through 6. See diagram below for settings.Meter Gain Calibration: DIP switch sections S2 and S3 determine the Gain Calibration, which adjusts the level of the input signal and the resultant "0" level displayed on the LED bargraphs. Factory setting is +4 dB. See diagram below for all settings.Bargraph Display Mode: DIP switch sections S4 and S5 determine how peak levels are displayed for the four associated meters on the front panel. S4 selects either the PPM level or a new auto-reset Peak Hold of the VU level (NOT the PPM value). When S3 is set for "VU Peak", S5 sets the Hold time to either 3 or 10 seconds. If S4 is set for "PPM Peak", S5 determines whether it is displayed in the original "floating PPM dot" mode (no hold, continuous decay of 20 dB in 1.5 seconds) or as a 3 second auto-reset Hold. The factory default setting is "PPM Peak - No Hold" (continuous decay of 20 dB in 1.5 seconds). See diagram below for all settings.Note: Section S6 on the DIP switch is not used.I Selected Analog Outputs (from Digital Source) - 3-Pin Male XLR ConnectorsThe SEL. OUT [CH A(L) and CH B(R)] output connectors are analog outputs of the selected digital source as selected for the left and right speakers and level meters. Both connectors are configured for low impedance connections. The output is not affected by the volume/balance controls or headphone mute. For all XLR pinout information see the diagram below.Gnd Pin-2Pin-1Gnd Pin-2Low (-)Female XLR PinoutTechnical Information• General Technical Observations• SDI to AES Converter Module (919096)• AES/EBU to Analog Converter Module Circuit Description (919117)• General Level Meter PCB Descriptions• LED Bargraph Level Meter Specifications• AMP1-SDA Interconnect Block DiagramGeneral Mechanical ObservationsElimination of cabinet and component sympathetic vibrations (resonances) requires considerable attention to mechanical details. Because of this, and the physical constraints of the speaker’s acoustic enclosures, even minor changes to any of the mechanical details of the unit can seriously impair its acoustic performance. This especially applies to the speaker baffles. If mechanical work on the unit is necessary, be sure to make adequate notes to permit accurate reassembly.Unfortunately, the unusual and wholly proprietary method of magnetic shielding is usually degraded slightly by any disassembly of the unit, except removal of the rear panel. Almost any maintenance or repair will require removal of the cover. If an immediately adjacent video monitor shows magnetic interference after reassembly of the unit, it must be returned to the factory to restore the shielding completely.General Audio Circuitry ObservationsSince a single-sided power supply is used, all amplifier sections are “biased” with a 1/2 supply reference, so all opamp signal terminals on the main board should have a DC level of +12V, +/-0.7V. Signal inputs to the main audio board from any of the input select circuits are via the balanced input stage, in lieu of the XLR analog inputs on the basic unit. Signal feed points for level meters and the phase indicator are immediately after the input stage, and before the volume control section.The signal pick-off for the headphones is after the volume and balance controls. Speaker muting is controlled by circuitry that senses connection of headphones to the jack.The power amps are attached to an aluminum heatsink plate (which is also connected to the circuit common for these devices). The heatsink plate forms an operational module separate from the chassis, which allows access to the solder side of the circuit board while power is applied to the circuitry. To avoid thermal shutdown of the power amp(s), they should NOT be operated without their tabs being fastened to the heatsink plate.Variations in the frequency response of different production runs of drivers has sometimes required minor adjustments in the equalization/crossover components in individual runs of units. Some of these components may have values slightly different than those indicated in the schematic, which are the nominal ones. If any of the drivers (speakers) are replaced, it may be helpful to change some of these components to achieve maximum flatness of response.The operating threshold of the woofer limiter is critical to both satisfactory reproduction of musical transients and preventing damage to, or destruction of, the speaker itself. The side speaker output limiter circuits are similarly important, though not as critically adjusted.The woofer power amps are arranged in a bridge configuration; care must be taken to avoid letting EITH ER speaker terminal contact the chassis (common) OR THE GROUNDED LEAD OF ANY TEST EQUIPMENT so as not to short out the power amps. The side speaker outputs are single-ended, so these precautions are not necessary for them.The 919096 (Serial Digital to AES/EBU Converter PCB) allows selected Wohler Technologies audio monitoring systems to be connected directly to a serial digital video signal containing embedded audio. Two levels of component signals (eg., D1, D5, and Digi Betacam type) are currently supported; synchronous audio at 48 KHz with either 20-bit data packets or audio and extended data packets. The 919096 demultiplexes (extracts) the audio data from the video data, reformatting it to the AES/EBU standard. A companion digital to analog converter module (AES/EBU Input) is required to convert the AES/EBU signal to analog audio.A front panel toggle switch selects channels one and two (first subgroup) or channels three and four (second subgroup) from group i.d. #1 for demuxing. Access to group two through four is optional.There are four primary and three ancillary sections comprising the 719117 AES/EBU digital to analog converter:1) Input source selection.2) audio data extraction.3) Digital to analog conversion.4) Analog buffer/output amplifiers.5) Power suppy, Reset, and Error indication.Input Source Selection (IC13)Each of the two selectable signal inputs are transformer-coupled to the inputs of a one-of-two active buffer/switch (IC13). The output of this switch is applied to the receiver stage of the AES receiver/unframer.Audio Data Extraction (IC11)"Header" and ancillary data are removed from the recovered input datastream, yielding a datastream having only alternating left/right channel audio data which is output on pin 26 of IC11.Digital to Analog Conversion (IC10)The "pure" audio datastream, along with a data clock and a channel ID (left/right) clock, are applied to a 20 bit two channel D to A converter (IC10), where the datastream is converted into left and right analog outputs.Analog buffer (IC4) / Output Amplifiers (IC8, IC9)Buffer/amps provide balanced left and right channel outputs as well as single ended outputs. Gain calibration, the analog level which corresponds to a given digital value, is settable via a DIP switch. The default factory setting is 20 dB below "full code" (digital zero) to equal +4 dbu (0.775V). The other three settings possible are for -18 dBfs = 0 dBu, -9 dBfs = +6 dBu, and -20 dBfs = +8 dBu. See page 12 for DIP switch location and settings.Power SupplyThe 24V rail internal to the rest of the unit is converted to +5V for digital portions of the 919117 PCB by switching regulator IC12. Error IndicationThe AES status LED is a bicolor LED (Red/Green). It is green as long as a valid digital data strean is being received. The 8412 receiver is capable of distinguishing two types of error conditions: 1) Faulty data; data identified by the sending device (possibly invalid), or 2) Faulty reception; errors in reception of data or no data stream at all. The red LED indication may be set to occur for only faulty reception (section 1 closed) or with either faulty data OR faulty reception (section 1 open). See Item B, page 12 for more information regarding this setting.Power CharacteristicsA +5 voltage (DC) is fed directly to a 4-channel Input Level Meter Engine PCB (919174). Bargraph brightness is regulated from the Bargraph Driver PCB(s) (919173).4-Channel Input Level Meter Engine Boards (919174)The analog input signals or digital input signals (after conversion from digital to analog) are inputted to a discrete Input Level Meter Engine PCB. Each Input Level Meter Engine PC boards responsibility is to process tasks such as Digital Signal Processing (DSP),frequency response, integration time, VU or PPM “dot” display mode, and phase correlation (special order option). The ADSP-2184chip on each input board handles the entire processing function. During the assembly of an AMP1-SDA unit, software is programmed and loaded to a socket chip for a specific unit in-house.A standard factory calibration of "0" indication when input level is +4 dB is set for the calibration level unless specified differently by the end user. A bank of DIP switch sections is located at the rear of these boards, which can be accessed from the rear panel. A combination of DIP switch settings can be use to calibrate the line level input to "0", set the Gain Calibration, or select the Display Mode (VU, PPM). See page 14 for for information regarding these DIP switch settings.Bargraph Driver (919173) and Bargraph Display Boards (919172)All the signal information processed from the Input Level Meter Engine PC boards are transfered to the Bargraph Driver PC boards through a 10-pin color coded cable. The Bargraph Display PC board holds the actual LED bargraph modules at the front panel and is mounted in front of the Bargraph Driver PC board and connected to it directly by header/housing connections. The Bargraph Driver PC Boards accept fixed-length word serially, and latch the outputs for the bargraph segments corresponding to those bits in the received word, which are set high.Brightness of the bargraph displays can be adjusted to a desired setting by adjusting the trimpot located on the front panel. Both bargraph displays are simultaneously adjusted with this one trimpot.26-Segment Bargraphs with Analog ScaleLevel meter type:Segment quantity:Meter display modes (DIP switch selectable):PPM peak hold properties (DIP switch select):VU peak hold properties (DIP switch select):Level gain (DIP switch selectable):Level meter scale:Dynamic range:Midscale resolution:Bargraph Length:LED segment size:LED segment pitch:Segment display color:Peak emmision wavelength:Segment brighness, (If = 20 mA):Segment brightness, uniformity:Adjacent segment "Off" brightness:LED bargraph 26VU (bar)or PPM (dot)20 dB decay in 1.5 seconds or 3 second hold 3 second hold or 10 second hold 0, +4, +6, +8 dBu +12 to -50 dB 62 dB 2 dB1.078" (27.85 mm)0.14" x 0.028" (3.57 x 0.7 mm)0.041" (1.05 mm)Tri-color (red, amber, green)Green: 570 nm, Red: 630 nm 3.5 mcd<10% difference between segments <1% of brightness of active segmentSOURCEA M P 1-S D A I n t e r c o n n e c tB l o c k D i a g r a mS A n a l o g S A n a l o A n a l o g A n a l (F r o D i g i t D I (A A S L e f t W o o f e r S p e a k e re f t i d e p e a k e ri g h t i d e p e a k e rR i g h t W o o f e r S p e a k e r(R e v -A , 05/04/02)。