DOCSLIB.ORG

C300z Two-Way Loudspeaker User's Manual

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

C300z TWO-WAY LOUDSPEAKER USer’S MANUAL C300z SAFETY INSTRUCTIONS According to OSHA, any exposure in excess of these permissible limits could result in some 1. Read these instructions. hearing loss. To ensure against potentially dangerous exposure to high sound pressure 2. Keep these instructions. levels, it is recommended that all persons 3. Heed all warnings. exposed to equipment capable of producing high sound pressure levels use hearing pro- 4. Follow all instructions. tectors while the equipment is in operation. Ear plugs or protectors in the 5. Do not use this apparatus near water. ear canals or over the ears must be worn when operating the equipment in order to prevent a permanent hearing loss if exposure is in excess of the 6. Clean only with a dry cloth. limits set forth here. 7. Do not block any ventilation openings. Install in accordance with Duration Per Day Sound Level dBA, Typical the manufacturer’s instructions. In Hours Slow Response Example 8. Do not install near any heat sources such as radiators, heat 8 90 Duo in small club registers, stoves, or other apparatus (including amplifiers) that 6 92 produce heat. 4 95 Subway Train 3 97 9. Only use attachments/accessories specified by the 2 100 Very loud classical music manufacturer. 1.5 102 1 105 Tami screaming at Adrian about deadlines Refer all servicing to qualified service personnel. Servicing is 10. 0.5 110 required when the apparatus has been damaged in any way, 0.25 or less 115 Loudest parts at a rock concert such as liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, Rigging Precautions: When mounting or suspending Mackie does not operate normally, or has been dropped. 14. loudspeaker enclosures, it is essential that load ratings, rigging 11. The entire sound system must be designed in compliance with the techniques, and special safety considerations be appropriate current standards and laws regarding electrical systems. for the installation. Use only the mounting/rigging points on the loudspeaker enclosure intended for this purpose. The user 12. When installing and using this apparatus, keep in mind the must determine the load requirements, dynamic loading, and any technical specifications indicated in the dedicated section of the other contributing factors affecting the loudspeaker installation. manual. The user must determine the proper safety factor for specific 13. Exposure to extremely high noise levels may cause permanent applications and the required load rating of the connection hearing loss. Individuals vary considerably in susceptibility to to structure. Comply with all applicable federal, state, and local noise-induced hearing loss, but nearly everyone will lose some regulations. hearing if exposed to sufficiently intense noise for a period of time. Mackie strongly recommends the following rigging system practices: The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the permissible noise level Documentation: Thoroughly document the mounting/rigging design with exposures shown in the following chart. detailed drawings and parts lists. Analysis: Have a licensed structural engineer or other qualified profes- sional review and approve the mounting/rigging design before its implementation. Installation: Use personnel experienced and qualified for mounting/rigging loudspeakers in accordance with and in compliance with all federal, state and local regulations. DANGER: Loudspeakers should be mounted or suspended only by persons with knowledge of the proper hardware and rigging techniques. When stacking or pole-mounting loudspeakers, be sure that they are stabilized and secured from falling over or being accidentally pushed over. Failure to follow these precautions may result in damage to the equipment, personal injury, or death. Contents INTRODUCTION ...............................................................3 SERVICE INFO ..................................................................8 HOOKUP DIAGRAMS ......................................................4 Troubleshooting ........................................................8 Quick Start ................................................................4 Repair ........................................................................8 PLACEMENT .....................................................................6 CARE AND MAINTENANCE ..............................................9 PROTECTION ...................................................................7 CONNECTIONS ................................................................9 RIGGING ...........................................................................7 C300z SPECIFICATIONS ...............................................10 C300z LIMITED WARRANTY .........................................11 Don’t forget to visit our website at www.mackie.com for more information about this and other Mackie products. INTRODUCTION Thank you for choosing Mackie sound rein- The Crossover forcement loudspeakers. This unique Low Impedance Compensated The C00z is a portable two-way loudspeaker Crossover (LICC) design places inductors in se- system, specifically designed to complement our ries with the woofer whose values are markedly PPM Series line of professional powered mix- lower than conventional designs. This reduces ers. They are capable of extremely high sound the amount of energy that is typically wasted as pressure levels, and designed to give you the best heat and increases the amount of energy that is performance of any loudspeaker in its class and transformed into real acoustic power. It also incor- price range. porates dynamic protection for the compression The Transducers driver from non-linear signals. The C00z features a 12-inch high-power The Cabinet low-frequency woofer and a 1.75-inch titanium The C00z cabinet was designed to be the diaphragm high-output compression driver. The strongest molded composite cabinet on the planet. woofer incorporates technology used in large- This material is as strong as a rhinoceros horn, format touring systems and, with a massive, and rigid enough to prevent unwanted vibrations precision -inch voice coil, is virtually inde- and standing waves in the cabinet. It has built-in structible. fly points for hanging, and a socket in the bottom The high-frequency compression driver is for mounting on a tripod stand. Although it is an mounted on a multi-cell aperture loaded on a exceptional choice for installed sound situations, constant directivity horn, providing an ultra- its light weight and durable finish also make it wide, controlled dispersion pattern and precise ideal for portable sound system use. The asym- reproduction of the critical upper mid-range and metrical trapezoidal design of the cabinet also high-frequencies. The result is an unbelievably makes it easy to use as a floor wedge for stage smooth off-axis response that allows everyone in monitor applications. the audience to experience the same high-reso- The C00z offers a portable, lightweight lution audio no matter where they are seated. solution for a variety of high-powered sound rein- Each driver has been specifically designed by forcement applications. our engineers for optimum performance in a light- weight high-strength cabinet. Please write your serial number here for future reference (i.e. insurance claims, tech support, return authorization, etc.): Purchased at: Date of purchase: Part No. SW0584 Rev. C 01/08 ©2004-2008 LOUD Technologies Inc. All Rights Reserved. HOOKUP DIAGRAMS Quick Start Make all initial connections . Turn on your mixing console (or other signal with the power switches OFF source). on all equipment. Make sure . Turn on the amplifier. Turn up its volume or all master volume, level, or gain gain control(s) as recommended by the manu- controls are all the way down. facturer. 1. Connect the line-level outputs from your 5. Start the signal source, whether it be speak- mixing console (or other signal source) to the ing into a microphone or starting a CD player. inputs of your power amplifier. Adjust the volume controls on the mixer (or . Connect the “Speaker Output” from your power other signal source) for normal operation. amplifier (or powered mixer) to one of the INPUT connectors on the C00z, either the 1/" TS jack or the NL Speakon™-style connector. POWERED MIXER MAXIMUM NUMBER OF SPEAKERS IN PARALLEL IS 2 PER POWERED MIXER OR AMPLIFIED CHANNEL SPECIFICATIONS: SPECIFICATIONS: POWER HANDLING: POWER HANDLING: RMS • 300 WATTS RMS • 300 WATTS MUSIC • 500 WATTS MUSIC • 500 WATTS C300z: WITH A POWEREDPEAK • 750 WATTS MIXER, AND UsiPEAKNG • 750 WATTS the thrU JacK IMPEDANCE • 8 OHMS IMPEDANCE • 8 OHMS HORN DISPERSION • 90° X 40° HORN DISPERSION • 90° X 40° PROLONGED EXPOSURE TO HIGH PROLONGED EXPOSURE TO HIGH SOUND PRESSURE LEVELS MAY SOUND PRESSURE LEVELS MAY LEAD TO PERMANENT HEARING LEAD TO PERMANENT HEARING DAMAGE. PLEASE USE CARE WHEN DAMAGE. PLEASE USE CARE WHEN SETTING MAXIMUM LOUDNESS. SETTING MAXIMUM LOUDNESS. WIDE DISPERSION WIDE DISPERSION EVERYBODY HEARS THE SAME THING EVERYBODY HEARS THE SAME THING POWERED MIXER POWERED MIXER MAXIMUM NUMBER OF SPEAKERS IN PARALLEL IS MAXIMUM NUMBER OF SPEAKERS IN PARALLEL IS 2 PER POWERED MIXER OR AMPLIFIED CHANNEL 2 PER POWERED MIXER OR AMPLIFIED CHANNEL DO NOT SUSPEND FROM HANDLES. DO NOT SUSPEND FROM HANDLES. CONSULT USERS MANUAL FOR PROPER USE OF BUILT IN SUSPENSION HARDWARE. CONSULT USERS MANUAL FOR PROPER USE OF BUILT IN SUSPENSION HARDWARE. SERIAL NUMBER MANUFACTURING
Recommended publications
  • California State University, Northridge a Digital

    California State University, Northridge a Digital

    CALIFORNIA STATE UNIVERSITY, NORTHRIDGE A DIGITAL LOUDSPEAKER EQUALIZATION TECHNIQUE A graduate project submitted in pmiial fulfillment of the requirements For the degree of Master of Science in Electrical Engineering By Colby J Buddelmeyer December, 2011 The project of Colby J Buddelmeyer is approved: Dr. Xiyi Hang Date Professor Benjamin F. Mallard Date Date California State University, Northridge 11 DEDICATION To my wife, Anna Pomerantz: Thank you for your support, encouragement, and patience. I could not have finished this journey without you. 111 ACKNOWLEDGEMENT I would like to thank Dr. Sean Olive, Allan Devantier, and the Harman International R & D Group for allowing me to use the HATS (Hannan Audio Test System) as part of my project. Their work has fmihered our understanding of listening and created tools to revolutionize speaker design. I also want to thank Tim Prenta, Vice President of Acoustics and Kevin Bailey, Director of Mechanical Engineering at Hannan Consumer for their support of my project. They allowed me tin1e to pursue my Masters and gave me access to the tools and resources used to build this project. Their support made this project possible and I am in their debt. Special thanks also to my project advisor Dr. Ichiro Hashimoto for his mentming, encouragement, and friendship. His teachings will greatly influence the course of my future endeavors. Much appreciation goes out to Dr. Xiyi Hang and Professor Benjamin Mallard for evaluating my project and being such great instructors. Thanks to Jolm Jackson for assisting me in taking measurements and providing guidance as to their meaning. Lastly, I wish to thank Brian Castro, Mark Glazer, James Hall, and Charles Sprinkle for sharing their knowledge of loudspeakers and DSP.
  • The Acoustic Design of Minimum Diffraction Coaxial Loudspeakers with Integrated Waveguides

    The Acoustic Design of Minimum Diffraction Coaxial Loudspeakers with Integrated Waveguides

    Audio Engineering Society Convention Paper Presented at the 142nd Convention 2017 May 20–23 Berlin, Germany This Convention paper was selected based on a submitted abstract and 750-word precis that have been peer reviewed by at least two qualified anonymous reviewers. The complete manuscript was not peer reviewed. This convention paper has been reproduced from the author's advance manuscript without editing, corrections, or consideration by the Review Board. The AES takes no responsibility for the contents. This paper is available in the AES E-Library, http://www.aes.org/e-lib. All rights reserved. Reproduction of this paper, or any portion thereof, is not permitted without direct permission from the Journal of the Audio Engineering Society. The Acoustic Design of Minimum Diffraction Coaxial Loudspeakers with Integrated Waveguides Aki Mäkivirta, Jussi Väisänen, Ilpo Martikainen, Thomas Lund, Siamäk Naghian Genelec Oy, Iisalmi, Finland Correspondence should be addressed to Aki Mäkivirta ([email protected]) ABSTRACT Complementary to precision microphones, creating an ideal point source monitoring speaker has long been considered the holy grail of loudspeaker design. Coaxial transducers unfortunately typically come with several design compromises, such as adding intermodulation distortion, giving rise to various sources of diffraction, and resulting in somewhat restricted maximum output performance or frequency response. In this paper, we review the history of coaxial transducer design, considerations for an ideal point source loudspeaker, discuss the performance of a minimum diffraction coaxial loudspeaker and describe novel designs where the bottlenecks of conventional coaxial transducers have been eliminated. In these, the coaxial element also forms an integral part of a compact, continuous waveguide, thereby further facilitating smooth off-axis dispersion.
  • Loudspeakers and Headphones 21 –24 August 2013 Helsinki, Finland

    Loudspeakers and Headphones 21 –24 August 2013 Helsinki, Finland

    CONFERENCE REPORT AES 51 st International Conference Loudspeakers and Headphones 21 –24 August 2013 Helsinki, Finland CONFERENCE REPORT elsinki, Finland is known for having two sea - An unexpectedly large turnout of 130 people almost sons: August and winter (adapted from Con - overwhelmed the organizers as over 75% of them Hnolly). However, despite some torrential rain in registered around the time of the “early bird” cut-off the previous week, the weather during the conference date. Twenty countries were represented with most of was excellent. The conference was held at the Helsinki the participants coming from Europe, but some came Congress Paasitorni, which was built in the first from as far away as Los Angeles, San Francisco, Lima, decades of the twentieth century. The recently restored Rio de Janeiro, Tokyo, and Guangzhou. Companies building is made of granite that was dug from the such Apple, Beats, Comsol, Bose, Genelec, Harman, ground where the building now stands. The location KEF, Neumann, Nokia, Samsung, Sennheiser, Skype, near the city center and right by the harbor proved to and Sony were represented by their employees. be an excellent location both for transportation and Universities represented included Aalto (in Helsinki), the social program. Aalborg, Budapest, and Kyushu. 790 J. Audio Eng. Soc., Vol. 61, No. 10, 2013 October CONFERENCE REPORT A packed House of Science and Letters for the Tutorial Day Sponsors Juha Backmann insists that “Reproduced audio WILL be better in the future.” J. Audio Eng. Soc., Vol. 61, No. 10, 2013 October 791 CONFERENCE REPORT low-frequency performance can still be designed using Thiele- Small parameters in a simulation, and the effect of individual parameters (such as voice coil length and pole piece size) on the system performance can be seen directly.
  • Voip V2 Loudspeaker Amplifier (Wireless) Operations Guide

    Voip V2 Loudspeaker Amplifier (Wireless) Operations Guide

    VoIP V2 Loudspeaker Amplifier (Wireless) Operations Guide Part #011096 Document Part #930361E for Firmware Version 6.0.0 CyberData Corporation 3 Justin Court Monterey, CA 93940 (831) 373-2601 VoIP V2 Paging Amplifier Operations Guide 930361E Part # 011096 COPYRIGHT NOTICE: © 2011, CyberData Corporation, ALL RIGHTS RESERVED. This manual and related materials are the copyrighted property of CyberData Corporation. No part of this manual or related materials may be reproduced or transmitted, in any form or by any means (except for internal use by licensed customers), without prior express written permission of CyberData Corporation. This manual, and the products, software, firmware, and/or hardware described in this manual are the property of CyberData Corporation, provided under the terms of an agreement between CyberData Corporation and recipient of this manual, and their use is subject to that agreement and its terms. DISCLAIMER: Except as expressly and specifically stated in a written agreement executed by CyberData Corporation, CyberData Corporation makes no representation or warranty, express or implied, including any warranty or merchantability or fitness for any purpose, with respect to this manual or the products, software, firmware, and/or hardware described herein, and CyberData Corporation assumes no liability for damages or claims resulting from any use of this manual or such products, software, firmware, and/or hardware. CyberData Corporation reserves the right to make changes, without notice, to this manual and to any such product, software, firmware, and/or hardware. OPEN SOURCE STATEMENT: Certain software components included in CyberData products are subject to the GNU General Public License (GPL) and Lesser GNU General Public License (LGPL) “open source” or “free software” licenses.
  • Genelec AIW25 Active In-Wall Loudspeaker Operating Manual

    Genelec AIW25 Active In-Wall Loudspeaker Operating Manual

    Operating Manual AIW25 Genelec AIW25 Active In-Wall Loudspeaker Genelec AIW25 Active In-Wall Loudspeaker The Genelec AIW25 Active In-Wall loud- Installation This results in a precise and stable sound speaker system consists of a two-way image. loudspeaker enclosure and a matched Genelec recommends that you use the ser- If the AIW25 loudspeakers are used in an remote amplifier module, RAM2. It has been vices of an authorized installation special- application where their capability for precise designed to the same rigorous standards as ist or other competent and experienced sound imaging is needed, such as the front Genelec’s high-performance HT series active installation company for the installation of channels of a Surround Sound system or a Home Theater loudspeakers. No other in- the AIW25 system. Ask your local Genelec Stereo system, we recommend that the loud- wall loudspeaker in this size class can match dealer for recommended installation compa- speakers are placed as far away from cor- the low distortion, neutrality and high sound nies in your region. ners or other walls and reflective surfaces as pressure capability of Genelec AIW25. The possible. The loudspeakers should be placed AIW25 can be used in the most demanding Matching loudspeakers and symmetrically in relation to the listening posi- applications, like the main L-C-R array of a amplifiers tion and there should be no obstructions Home Theater system, critical Stereo listen- Each AIW25 loudspeaker has been factory between the loudspeaker and the listener. ing or rear/side channels of a medium sized, calibrated for optimum performance with the This guarantees clear dialogue in films and a state-of-the-art Home Theater.
  • Chapter 186 NOISE

    Chapter 186 NOISE

    Chapter 186 NOISE §186-1. Loud and unnecessary noise §186-3. Permits for amplifying devices. prohibited. §186-4. Stationary noise limits; maximum §186-2. Loud and unnecessary noises permissible sound levels. enumerated. §186-5. Violations and penalties. [HISTORY: Adopted by the Village Board of the Village of Albany 5-11-1992 as Sec. 11-2- 7 of the 1992 Code. Amendments noted where applicable.] GENERAL REFERENCES Disorderly conduct -- See Ch. 110. Parks and navigable waters -- See Ch. 198, §198-1B(2). Peace and good order -- See Ch. 202. §186-1. Loud and unnecessary noise prohibited. It shall be unlawful for any person to make, continue or cause to be made or continued any loud and unnecessary noise. It shall be unlawful for any person knowingly or wantonly to use or operate, or to cause to be used or operated, any mechanical device, machine, apparatus or instrument for intensification or amplification of the human voice or any sound or noise in any public or private place in such manner that the peace and good order of the neighborhood is disturbed or that persons owning, using or occupying property in the neighborhood are disturbed or annoyed. §186-2. Loud and unnecessary noises enumerated. The following acts are declared to be loud, disturbing and unnecessary noises in violation of this chapter, but this enumeration shall not be deemed to be exclusive: A. Horns; signaling devices. The sounding of any horn or signaling device on any automobile, motorcycle or other vehicle on any street or public place in the village for longer than three seconds in any period of one minute or less, except as a danger warning; the creation of any unreasonable loud or harsh sound by means of any signaling device and the sounding of any plainly audible device for an unreasonable period of time; the use of any signaling device except one operated by hand or electricity; the use of any horn, whistle or other device operated by engine exhaust and the use of any signaling device when traffic is for any reason held up.
  • 11.8 Loudspeaker Enclosures 11-71

    11.8 Loudspeaker Enclosures 11-71

    11.8 Loudspeaker enclosures 11-71 11.8 Loudspeaker enclosures 11.8.1 Basics Often, cases guitar-amplifier and -speaker are mounted within the same enclosure (combo); alternatively, there is also the two-part piggy-back or stack design. From the multitude of sizes available on the market, Fig. 11.82 shows a small selection: predominantly, 10”- and 12”-speakers are found, occasionally also 15” (with 1” = 2.54 cm). The small combos almost always have a large opening in the rear while the larger enclosures are either of closed design or realized as ported box (bass-reflex). In the widest sense of the word, the enclosures open to the rear also represent a kind of bass-reflex system – albeit a very special one. Fig. 11.82: Loudspeaker enclosures; Membrane-diameters in inches The enclosure (or cabinet) makes a significant contribution to the sound generation. If it is airtight, it predominantly has the effect of an air-suspension to the membrane that increases the resonance frequency. Since this air-stiffness grows invers to the volume, a small enclosure would strongly increase the resonance frequency – it is presumably for this reason that small 5 2 cabinets mostly have an open back. The stiffness of air is sL = 1.4⋅10 Pa ⋅ S / V for adiabatic changes. In this formula, S is the effective membrane surface, and V is the net volume of the enclosure. For a 12”-speaker and a 50-litre-box, we calculate 9179 N/m – this approximately corresponds to the stiffness of the membrane. As an example: with such a mounting, the resonance frequency for a Celestion Blue would rise by 50%.
  • Application Notes

    Application Notes

    Measurement of Loudspeaker and Microphone Performance using Dual Channel FFT-Analysis by Henrik Biering M.Sc, Briiel&Kjcer Introduction In general, the components of an audio system have well-defined — mostly electrical — inputs and out­ puts. This is a great advantage when it comes to objective measurements of the performance of such devices. Loudspeakers and microphones, how­ ever, being electro-acoustic transduc­ ers, are the major exceptions to the rule and present us with two impor­ tant problems to be considered before meaningful evaluation of these devices is possible. Firstly, since measuring instru­ ments are based on the processing of electrical signals, any measurement of acoustical performance involves the Fig. 1. General set-up for loudspeaker measurements. The Digital Cassette Recorder Type use of both a transmitter and a receiv- 7400 is used for storage of the measurement set-ups in addition to storage of the If we intend to measure the re- measured data. Graphics Recorder Type 2313 is used for reformatting data and for ., „ J, ,, „ plotting results sponse of one of these, the response ol the other must have a "flat" frequency response, or at least one that is known in advance. Secondly, neither the output of a loudspeaker nor the input to a micro­ phone are well-defined under practical circumstances where the interaction between the transducer and the room cannot be neglected if meaningful re­ sults — i.e. results correlating with subjective evaluations — are to be ob­ tained. See Fig. 2. For this reason a single specific measurement type for the character­ ization of a transducer cannot be de- r.- n T ,-,,-,■ -.
  • Mth-2.5/42Bt

    Mth-2.5/42Bt

    ElectroVoice® MTH-2.5/42BT Manifold Technology® Mid-bass/High-Fre­ quency Sound Reinforce­ ment System • Sonically improved lower midrange • 40° x 20° constant-directivity pattern • Smaller MT trapezoidal enclosure • Rotatable MB & HF horns • High acoustic output, low distortion • Manifold Technology® enables smaller and lighter loudspeaker arrays • MT systems with different coverage patterns and output capabilities may be mixed and matched • Unique rigging scheme for flexible array design and quick assembly SHOWN WITHOUT GRILL • Available without rigging hardware SPECIFICATIONS Third Harmonic, MTH-2.5/42BT is an active, two-way, horn­ Frequency Response (measured in far 200 Hz: 0.8% loaded, 40° x 20° constant-directivity system field, calculated to one meter on axis, 1,000 Hz: 1.3% with a trapezoidal enclosure, utilizing two high­ swept sine wave, one watt into mid-bass 3,000 Hz: 0.1% power mid-bass drivers in the mid-bass fre­ section, anechoic environment; see 10,000 Hz: 1 .4% quency band and two high-power compression Figure 1): Transducer Complement, drivers in the high-frequency band . Both the 150-20,000 Hz MB: Two DL 1OX 10-inch drivers, mid-bass and high-frequency horns may be Recommended Crossover Frequencies: 40° x 40° fiberglass horn rotated in the enclosure. This configuration 160 Hz, 1,600 Hz HF: Two DH1A variant compression results in remarkably high acoustic output from Efficiency, MB/HF: drivers; HP42S, 40° x 20° horn a small enclosure. The MTH-2.5/42BT may be 16/25% Impedance (see Figures 2 & 7), combined with other members of the MT-2B Long-Term Average Power-Handling Nominal, MB/HF: and MT-4B loudspeaker family.
  • Loudspeaker Parameters

    Loudspeaker Parameters

    Loudspeaker Parameters D. G. Meyer School of Electrical & Computer Engineering Outline • Review of How Loudspeakers Work • Small Signal Loudspeaker Parameters • Effect of Loudspeaker Cable • Sample Loudspeaker • Electrical Power Needed • Sealed Box Design Example How Loudspeakers Work How Loudspeakers Are Made Fundamental Small Signal Mechanical Parameters 2 • Sd – projected area of driver diaphragm (m ) • Mms – mass of diaphragm (kg) • Cms – compliance of driver’s suspension (m/N) • Rms – mechanical resistance of driver’s suspension (N•s/m) • Le – voice coil inductance (mH) • Re – DC resistance of voice coil ( Ω) • Bl – product of magnetic field strength in voice coil gap and length of wire in magnetic field (T•m) Small Signal Parameters These values can be determined by measuring the input impedance of the driver, near the resonance frequency, at small input levels for which the mechanical behavior of the driver is effectively linear. • Fs – (free air) resonance frequency of driver (Hz) – frequency at which the combination of the energy stored in the moving mass and suspension compliance is maximum, which results in maximum cone velocity – usually it is less efficient to produce output frequencies below F s – input signals significantly below F s can result in large excursions – typical factory tolerance for F s spec is ±15% Measurement of Loudspeaker Free-Air Resonance Small Signal Parameters These values can be determined by measuring the input impedance of the driver, near the resonance frequency, at small input levels for which the
  • 7Tara, C. 2.É.- HIS at TORNEY 3,167,314 United States Patent Office Patiented Jan

    7Tara, C. 2.É.- HIS at TORNEY 3,167,314 United States Patent Office Patiented Jan

    Jan. 26, 1965 A. R. BENTSEN 3,167,314 PORTABLE PHONOGRAPH Filed June 1, 1962 . ce.. --. AY NVENT OR: ARTHUR R. BENTSEN, BY 7tara, c. 2.É.- HIS AT TORNEY 3,167,314 United States Patent Office Patiented Jan. 26, 1965 warrammaar. E. 2 3, 67,334 the generally downward tilting movement of the record PCERTARE PGNC GRAPH player from its vertical to its horizontal position, the hori ArtEZ2 R. Begise, Liverpool, N.Y., assigng" to General Zontal axis for pivotal movement of the record player 4 Eiegfric Coalpany, a corporation of New Yerk is also located, as shown in F.G. 5, in the lower half of Fied site , 962, Ser. No. 99,343 5 the case ii. When the record player 4 is in its hori 7 Caians. (C. 274-2) Zontal position (as shown in FIG. 5), a substantial por tion thereof is, therefore, located within opening 15 of This invention relates to phonographs, and particularly the case 13. Suitable stop members, not shown, may be to portable stereo phonographs. provided for the horizontal positioning of the base 13, Various arrangements have been devised for portable O or a lip ia at the lower part of the front of the cabinet stereo phonographs, and generally are concerned with it may function as a stop for proper horizontal position ways of attaching and using a pair of stereo loudspeakers. ing of the base 5. In some of these arrangements the loudspeakers are lo A record player mechanism 26, shown in the drawing cated in small cabinets intended to be separated and spaced as being of a record changing type, is carried by the base from the phonograph when in use.
  • Cyberdata SIP Loudspeaker Amplifier - Poe (011405)

    Cyberdata SIP Loudspeaker Amplifier - Poe (011405)

    Created on: Monday 26 April, 2021 CyberData SIP Loudspeaker Amplifier - PoE (011405) Product Name: CyberData SIP Loudspeaker Amplifier - PoE (011405) Manufacturer: CyberData Model Number: 011405 CyberData SIP Loudspeaker Amplifier - PoE (011405) The CyberData SIP-enabled Loudspeaker Amplifier PoE (011405) provides an easy method for implementing a loud IP-based overhead paging system for loud areas, warehouses, manufacturing areas, and outdoor areas. CyberData 011405 Features � SIP Enhanced interoperability for hosted environmentsCyberData has maintained one of the most comprehensive list of IP PBX servers certified to work with CyberData � NEW SECURITY FEATURES:Support for security code access for SIP pagingAutoprovisioning via HTTPSHTTPS web based configuration � Support for G.722 codecs � 802.11q VLAN tagging � Configurable sense input for use with fault detection � Configurable event generation for device health and status monitoring � Optional direct connect RGB strobe kit connection (coming soon) � 9 user-uploadable page messages Packaged in a NEMA 3R/IP42-rated enclosure With up to 9 user-stored messages, the Amplifier provides direct drive of up two 8 Ohm horns. The interface is compatible with most SIP-based IP PBX servers that comply with the SIP RFC 3261. For non-SIP environments, the Loudspeaker Amplifier can be configured to listen to multicast address and port number combinations to form paging zones. CyberData 011405 - Technical Specifications Features � SIP and Simultaneous Multicast � Dual-speed ethernet