CLEAR-COM ENCORE AMS-1027 AMPLIFIED MONITOR SPEAKER INSTRUCTION MANUAL
AMS-1027 Amplified Monitor Speaker Instruction Manual © 2007 Vitec Group Communications Ltd. All rights reserved. Part Number 810284Z Rev. 1 Vitec Group Communications, LLC. 850 Marina Village Parkway Alameda, CA 94501 U.S.A Vitec Group Communications 7400 Beach Drive Cambridge Research Park Cambridgeshire United Kingdom CB25 9TP Vitec Group Communications Room 1806, Hua Bin Building No. 8 Yong An Dong Li Jian Guo Men Wai Ave Chao Yang District Beijing, P.R.
CONTENTS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Radio. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limiting Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Headphone and Speakers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 AMS-1027 Interconnect Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Left and Right Meter Driver PCA Component Layout Drawings . . . . . . . . . 3-5 AMS-1027 Left and Right Meter Driver PCA Schematic . . . . . . . . . . . . . . .
IMPORTANT SAFETY INSTRUCTIONS 1. 2. 3. 4. 5. 6. 7. Please read and follow these instructions before operating this product. 8. 9. 10. 11. 12. 13. 14. 15. Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol alerts you to the presence of uninsulated dangerous voltage within the product's enclosure that might be of sufficient magnitude to constitute a risk of electric shock. Do not open the product's case. This symbol informs you that important operating and maintenance instructions are included in the literature accompanying this product.
1 OPERATION Thank you for choosing the Clear-Com AMS-1027 Amplified Speaker Station. For optimum results, please read this entire manual before installing your AMS-1027 station. The AMS-1027 is a bi-amplified, self-contained, rack-mountable audio monitor speaker that occupies only a single rack space. This amplified speaker station features exceptional audio quality, very low distortion, and high output power.
inputs are on XLR connectors, with unbalanced inputs on RCA connectors. Passive loop-through XLRs are also provided. The AMS-1027 is completely magnetically shielded to allow interference-free operation immediately adjacent to all CRT video monitors. Its lighter weight and shallower-depth chassis (compared to similar-type units) makes it ideal for use in portable and mobile vehicle applications.
• Internal universal AC mains power supply • Thoroughly magnetically shielded APPLICATIONS Radio Monitoring incoming and outgoing feeds Television/Video Postproduction • Confidence/cuing monitoring for all types of ATRs and VTRs in machine rooms and edit bays • Monitoring network and transmitter feeds • ENG, SNG and other OB vehicles and EFP systems Commercial Industrial Sound Monitoring audio feeds in theme parks, security installations, and teleconferencing systems AUDIO CIRCUIT The AMS-1027’s popular
1 Internal Speakers The AMS-1027’s internal speaker system is comprised of two mid/high-range speakers (left and right) and one woofer speaker (center). The two side channel speakers reproduce, in stereo, only the mid and high frequencies, while the center woofer speaker reproduces the low frequencies summed from both the left and right channels. 2 Volume Control The volume-control knob adjusts the loudness of the audio reproduced by the internal speakers or connected headphone.
REAR PANEL CONNECTORS AND SETTINGS Please refer to Figure 1-4 to familiarize yourself with the rear panel features of the AMS-1027 unit. The following sections describe the functions of each of the various features found on the rear panel and are referenced, by letter, to Figure 1-4. B 100-240-VAC 50/60 Hz 1.0A AMS-1027 A C D C Figure 1-4: Rear Panel of AMS-1027 A Power Connector Attach a standard IEC-320 power cord between this connector and mains power (100 - 240VAC, 50/60 Hz).
meters. There are two trim pots; one for Channel A (left) and one for Channel B (right). This dual adjustment configuration aids in the calibration of the meters with the input gain. Adjustment is between -10dBu and +10dBu (nominal). Gain increases as the pots are turned clock-wise. These controls may be accessed with a small flat-blade screwdriver. Note: Do not force the trim pots past their stop points as this will damage the unit.
Figure 1-5: Locate the volume/balance cable Figure 1-6: Unplug the cable from jumper 18 and plug it into jumper 16 AMS-1027 AMPLIFIED SPEAKER STATION 1-7
2 INSTALLATION QUICK START You can install the AMS-1027 in four easy steps: 1. Slide and secure the unit into the rack. 2. Connect the audio signals to the XLR or RCA input connectors. 3. Plug the unit’s supplied IEC-320 power cord into the AC mains. 4. Configure volume controls and set level meters (if required). MOUNTING You install the AMS-1027 in four easy steps. The unit should be mounted where convenient for operating, ideally at approximately ear level for best high-frequency response.
ELECTRICAL INTERFERENCE As with any audio equipment, maximum immunity from electrical interference requires the use of balanced, shielded cable; however, satisfactory results can sometimes be obtained without it. The internal circuitry common is connected to the chassis. Unbalanced sources may also be applied to the balanced inputs. The gain is 6 dB greater with a single-ended source connected across both “hot” terminals than when connected between either pin 2 or 3 and common.
3 MAINTENANCE GENERAL MECHANICAL OBSERVATIONS Elimination 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.
any of the drivers (speakers) are replaced, it may be necessary 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.
rise, which decreases the audio level of the VCA. For the standard volume/balance configuration, the right hand control board is plugged into J18. To implement the optional A volume/B volume configuration, the right hand control board is plugged into J16. For instructions, see “Vol/Bal to A-Vol/B-Vol Retrofit Instructions” on page 1-6.
AMS-1027 INTERCONNECT BLOCK DIAGRAM 7 Figure 3-1: Interconnect Block Diagram AMS-1027 AMPLIFIED SPEAKER STATION 3-4
LEFT AND RIGHT METER DRIVER PCA COMPONENT LAYOUT DRAWINGS Left Meter Driver PCA Layout Drawing Right Meter Driver PCA Layout Drawing Figure 3-2: Left and Right Meter Driver PCA Component Layout Drawings 3-5 AMS-1027 AMPLIFIED SPEAKER STATION
AMS-1027 LEFT AND RIGHT METER DRIVER PCA SCHEMATIC Figure 3-3: Left and Right Meter Driver Schematic AMS-1027 AMPLIFIED SPEAKER STATION 3-6
AMS-1027 MAIN AUDIO PCA COMPONENT LAYOUT DRAWING Figure 3-4: AMS-1027 Main Audio PCA Component Layout Drawing 3-7 AMS-1027 AMPLIFIED SPEAKER STATION
J2 J3 RCA JACK XLRM XLRF 1 3 J1 1 2 2 1 3 J4 XLRF P2 10K 2 J5 XLRM 2 3 1 1 3 2 2 2 2 RCA JACK J6 2 3 1 1 3 2 1 3 3 3 3 1 1 2 2 1 1 R89 47K R88 47K R86 47K R87 47K C3 .47u C29 C24 100p C27 .47u C8 100p .47u C5 2 3 2 3 C30 100pC32 C1 100p C43 2 C68 JP7 HEADER 2 JP6 2 1 HEADER 2 220uf 1 + 220uf R2 4.7k C50 .1u +C41 150U 220UF R50 2.7OHM R47 IC12B 100KLM4765 1 MISC1 R39 2.7OHM R36 IC12A 100K LM4765 3 IC11B LM4765 1 R60 100K C65 .1u R64 2.
4 SPECIFICATIONS AMS-1027 AMPLIFIED SPEAKER STATION 0 dBu is referenced to 0.775 volts RMS Input impedance Input level for full output (volume full on) Meter calibration range Hum and noise Acoustic freq.
Power Consumption Operating Temperature Range Connectors Chassis dimensions (H x W x D) Weight 40 watts Does not exceed approximately 60° Celsius (140° Fahrenheit) Balanced: XLR (with loop-through) Unbalanced: RCA 1.75 x 19 x 9 inches (44.5 x 483 x 229 mm) 7.5 lbs. (3.4 kg) Notice About Specifications While Clear-Com makes every attempt to maintain the accuracy of the information contained in its product manuals, that information is subject to change without notice.
4-3 AMS-1027 AMPLIFIED SPEAKER STATION
LIMITED WARRANTY Vitec Group Communications (VGC) warrants that at the time of purchase, the equipment supplied complies with any specification in the order confirmation when used under normal conditions, and is free from defects in workmanship and materials during the warranty period. VGC offers 24 x 7 customer support if you have an Extended Warranty or Service Contract. Return Material Authorization (RMA) numbers are required for all returns. Both warranty and non-warranty repairs are available.
such agreement. For more information, contact your authorized dealer, distributor, or sales representative. Instructions for reaching VGC’s User Support Centers are given below. Telephone for Europe, Middle East and Africa: +49 40 6688 4040 Telephone for the Americas and Asia: +1 510 337 6600 Email: vitec.support@AVC.de Once the standard warranty period has expired, the User Support Center will continue to provide telephone support if you have purchased an Extended Warranty or Service Contract.
years the warranty of any product offered with a standard two-year warranty. The total warranty period will not extend beyond five years. Any purchase of an extended warranty provides 24 x 7 customer support in addition to the warranty immediately upon purchase of the warranty extension. Note: VGC does not offer warranty extensions on UHF wireless intercom systems, or on any product with a 1-year or 90-day warranty.
of customer furnished components resulting in damage to VGC provided product. This limited warranty is not transferable and cannot be enforced by anyone other than the original consumer purchaser. This warranty gives you specific legal rights and you may have other rights which vary from country to country.
