AMPx-SDA Series • AMP1-SDA • AMP2-SDA Digital Audio Speaker Monitors User Guide Part Number 821027, Revision D
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AMPx-SDA User Guide Introduction Overview The AMPx-SDA Series of audio monitors provides self-powered, fullfidelity stereo monitoring in the smallest rack space possible. All models in the 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.
AMPx-SDA User Guide S a f e t y I n s tr u c ti o n s Safety Instructions IMPORTANT: 1. Read, keep, and follow all of these instructions; heed all warnings. 2. Do not use this equipment near water or moisture. 3. Use only a dry cloth to clean the equipment. 4. Do not block any ventilation openings. Install only in accordance with the instructions in the section entitled, “Installation Recommendations” on page 3. 5.
AMPx-SDA User Guide I n s ta l la t i o n R e c o m me n d a t io n s Installation Recommendations Mounting Note: 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.
AMPx-SDA User Guide Features Audio Connections Connection of the audio feeds is straightforward. 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.
AMPx-SDA User Guide Applications • 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 • SD-SDI signal status indication LED • AES signal status indication LED • SD-SDI subgroup 1 or 2 (of Group #1) source selection via front panel toggle switch • SD-SDI/AES source selection via front panel toggle switch • Digital/analog source selection via f
AMPx-SDA User Guide S p e c if i c a ti o n s Specifications Table 1–1 Audio Specifications for the AMPx-SDA Series Monitors Specifications AMP1-SDA Analog IN: XLR (3-pin female) 2 each SD-SDI IN: BNC (female) 1 each AES IN: BNC (female) 1 each XLR: 110 (Balanced) BNC: 75 (Unbalanced) XLR: 40k (Balanced) Input connectors Digital input impedance Analog input impedance Input Level for Maximum Output (Volume Full On) Input Overload Peak Acoustic Output (@ 2 ft.
AMPx-SDA User Guide S p e ci f i c a t i o n s Table 1–2 Physical Specifications for the AMPx-SDA Series Monitors Specifications Dimensions (H x W x D) Weight Table 1–3 D to A gain calibration, (dBu = dBFS): AES sampling rate: D to A converter: Converted analog out (S/N): Converted analog out (THD): AES Termination: Level Meter Type: Level Calibration Frequency Response LED Segment Colors Metering Range: Display Modes: VU Characteristics, Rise Time: Decay Time: PPM Characteristics, Decay Time: Meter
AMPx-SDA User Guide Front Panel Controls Table 1–4 Meter Specifications for the AMPx-SDA Series Monitors Specifications AMP1-SDA AMP2-SDA PPM: 20 dB decay in 1.5 sec. or 3 sec hold VU: 3 sec. hold or 10 sec. hold 1 dB 2 dB +16 to -50 dB .158" x .04" (4.0132 x 1.
AMPx-SDA User Guide Front Panel Controls • Speakers: The internal speaker system is comprised of two midrange tweeter speakers (left and right) and woofer speakers. The AMP1-SDA has two woofers wired in series and the AMP2-SDA has one larger woofer. The two side channel speakers reproduce, in stereo, only the mid and high frequencies. Please note that the woofer speaker (center) is not a dedicated center nor LFE speaker.
AMPx-SDA User Guide Front Panel Controls two smaller LEDs labeled Fast (left side of the Phase section) show instantaneous phase relationships in the signal, while the larger LED, labeled Avg (right side of the Phase section), will indicate the average phase condition. The small Fast LED on the left glows (or blinks) green when signals are in-phase. The small Fast LED on the right glows (or blinks) amber for out-of-phase signals.
AMPx-SDA User Guide Rear Panel Connectors • SDI Signal Error LED: This LED, labeled SDI glows green as long as a valid SD-SDI digital datastream is being received. It glows red if TSR errors are present in the signal. If there is no SD-SDI signal present the LED will be unlit. Rear Panel Connectors Common Connectors • Power: Attach a standard IEC-320 power cord between this connector and mains power (100 - 250VAC, 50/60 Hz).
AMPx-SDA User Guide R e a r P a n e l C o n n e ct o r s Note • Position 3 is not used. AES Error Indication Type: There are two DIP switch selectable modes of AES error detection that will create a RED error indication in the AES Signal Error Indication LED on the front panel; 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).
AMPx-SDA User Guide Rear Panel Connectors Figure 1–5 Note: AES DA Conversion Gain Calibration Settings All SDI signals are SD-SDI (Standard Definition). • SD-SDI In and Out: The SDI In female BNC connector is meant to receive standard SDI signals. The SDI Out female BNC connector outputs a reclocked (regenerated) copy of the signal entering the SDI In input connector. Both connectors are configured for unbalanced, 75 Ω connections.
AMPx-SDA User Guide R e a r P a n e l C o n n e ct o r s • Analog In: These two 3-pin female XLR connectors accept standard analog audio signals. Both connectors are configured for balanced 40k Ω connections. Note that the unit will monitor analog signals input on these two connectors only when the Analog/Digital Source Select switch on the front panel is set to Analog. For XLR pinout information see the Figure 1–6 on page 13.
AMPx-SDA User Guide Rear Panel Connectors • 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.
AMPx-SDA User Guide Technical Functional Overview AMP2-SDA-Specific Connectors Figure 1–9 AMP2-SDA Rear Panel Gain/Calibration Wohler Technologies Error Type 100-240 VAC 50/60 Hz 1.0 A SERIAL NO. MONTH www.Wohler.com DIGITAL GAIN CALIB dB dBFS AES/EBU IN AES/EBU OUT GAIN CALIB. AMP2-SDA 253338 +8 -20 +4 -20 +6 -9 0 -18 CH. A (L) IN OUT FROM DIGITAL SOURCE 1 2 3 CH. B (R) 1 CH. A(L) CH.
AMPx-SDA User Guide T e c h n i c a l F u n c t i o n a l O v e r vi e w Figure 1–11 AMP2-SDA Block Diagram 8 2 1 0 2 7 : A M P x-SD A U s e r G u i d e © 2 0 1 2 Woh l er Te c h n o l o g i es , I n c . A ll r i g h t s r e se r ve d .
