Meyer Sound HM-1S Speaker System User Manual
Contents
1. Meyer Sound Operating Instructions HM 1S Self Powered Studio Monitor Patents Pending Copyright 1998 Meyer Sound Laboratories Inc All rights reserved Part 05 059 004 01 Rev A2 Introduction Power Requirements Power Cable Requirements Audio Input The HM 1S Subwoofer Contents Bee 3 Cooling and Fan Installation 16 Er 3 Protection and Limiting e 16 EE 5 Safety Summary e bigger 5 Rear Panel Connectors e 18 sn a E 5 DIMENSIONS e 18 Symbols Used These symbols indicate important safety or operating features in this booklet and on the chassis A A Dangerous voltages Important operating risk of electric shock instructions Frame orchassis Protective earth ground Pour indiquer les risques Pour indeduerimportant r sultant de tensions eee Masse chassis Terre de protection dangereuses Zuwichtige betriebs Zudie gefahren von i FA H anweisung und unter Rahmen oder chassis Die schutzerde gefahrliche spanning zeigen haltsanweisung zeigen Para indicar azares Para indicar importante funcionar provengo de peligroso ymantenimiento instrucciones Armadura o chassis Tierra proteccionista voltajes The Manufacturer Declaration of Conformity According to ISO IEC Guide and EN 45014 declares that the product Name Address Meyer Sound Laboratories 2832 San Pablo Avenue Berkeley California 9472. Installed fans blow air over the heatsink 16 A Safety Summary A English To reduce the risk of electric shock disconnect the loud speaker from the AC adapter before installing audio cable Reconnect the adapter only after making all signal con nections Connect the AC adapter to a two pole three wire grounding mains receptacle The receptacle must be connected to a fuse or circuit breaker Connection to any other type of receptacle poses a shock hazard and may violate local electrical codes Do not install the loudspeaker in wet or humid locations Do not allow water or any foreign object to get inside the loudspeaker Do not put objects containing liquid on or near the unit To reduce the risk of overheating the loudspeaker avoid exposing it to direct sunlight Do not install the unit near heat emitting appliances such as a room heater or stove This loudspeaker contains potentially hazardous voltages Do not attempt to disassemble the unit The unit contains no user serviceable parts Repairs should be performed only by factory trained service personnel Fran ais Pour r duire le risque d lectrocution d branchez la prise principale de haut parleur avant d installer le c ble d interface allant laudio Ne rebranchez le bloc d alimentation qu apr s avoir effectu toutes les connections Branchez I haut parleur dans une prise de courant 3 d rivations deux p les et la terre Cette prise doit
3. Field Place the HM 1S directly above and coplanar to the subwoofer as pictured below Place a calibrated measurement microphone 1 meter on axis to the tweeter of the HM 1S as pictured below Using the noise or other broadband test signal perform a transfer function of the HM 1S Start with the subwoofer disconnected HM 1S on axis at 1 meter free field This represents a typical response of the HM 1S in free field environment on axis at 1 meter This measurement was performed in the large anechoic chamber at MSLI Connect the subwoofer and measure the combined response of the system HM 1S with in phase subwoofer on axis at 1 meter free field This represents a typical response of the HM 1S and subwoofer in phase in a free field environment on axis at 1 meter This measurement was performed in the large anechoic chamber at MSLI This response indicates a complementary phase relationship between the HM 1S and subwoofer 10 If the subwoofer is out of phase the combined response will have a significant loss of energy compared to the overall response at around 82 Hz as illustrated below HM 1S with out of phase subwoofer on axis at 1 meter free field 11 This represents a typical response of the HM 1S and subwoofer out of phase phase in a free field environment on axis at 1 meter This measurement was performed in the large anechoic chamber at MSLI If your system response indicates a phase reversal please con
4. ground plane response of the HM 1S and subwoofer out of phase in a ground plane environment on axis at 1 meter If your system response indicates a phase reversal please contact Meyer Sound Technical Support for assistance 15 Cooling and Fan Installation The HM 1S depends on natural convection to cool the heatsinks that absorb heat from the amplifiers and radiate the heat into the surrounding air space Natural convection requires free air in back of and underneath the HM 1S to allow air to flow up over the heatsinks The HM 1S reaches an equilibrium temperature in approximately 15 minutes at a steady operating level In free air ata typical room temperature of 25 C the HM 1S reaches an equilibrium temperature of e 40 C in a quiescent state no audio signal e 60 C at a moderate operating level occasional limiting e 75 C at the maximum operating level continuous limiting or ata moderate level with a subwoofer If the temperature reaches 85 C the thermal limiters activate see Protection and Limiting to prevent high source levels from further increasing the temperature and damaging the drivers and electronics The thermal limiters provide 30 dB of muting until the temperature decreases to 75 C The HM 1S can be cooled by two fans available as an accessory kit The fans should be used if e the HM 1S is enclosed in a soffit or ceiling mount without adequate space for natural convection e the HM 1S is u
5. output connector on the rear panel However depending on the loading conditions ample low frequency energy may be obtained by driving a single subwoofer from two HM 1Ss resulting in a correctly summed mono signal Cables for connecting one HM 1S to a subwoofer and two HM 1s to a single subwoofer are shipped with each HM 1S Subwoofer The addition of one subwoofer increases the maximum SPL of a single HM 1S by 4 dB without sub 116 dB SPL with sub 120 dB SPL The HM 1S Subwoofer has the following specifications Transducer 10 low frequency cone driver Medium Density Fiberboard MDF Oak Veneer natural or black 33 Ib 11 0 kg Height 17 5 Width 12 3 Depth 9 3 Enclosure Finish Weight Dimensions HM 1S Speaker Cable The following drawings and procedures are provided as an aid in the event that the speaker cable used to connect the HM 1S to the HM 1S Subwoofer needs to be repaired or extended In cases where the original speaker cable has been modified be sure to complete the Subwoofer Performance Verification section on page 10 of this manual Misalignment of the polarity between the HM 1S and the HM 1S Subwoofer will result in a serious degra dation of performance Single HM 1S to HM 1S Stereo Subwoofer Cable M S P N 28 062 007 01 SS ST 2 HM 1S to 1 HM 1S Mono Subwoofer Cable M S P N 28 062 009 01 Connections Gray wire to pin 1 pin 2 no connection pin 3 no connecti
6. such supplies The HM 1S does not require tight voltage regulation and operates down to 35 V although peak SPL values are reduced This operating voltage flexibility allows for wir ing loss and voltage foldback without interruption or degradation of the audio signal Many high power industrial supplies 1 5 kWatt are available for 19 EIA racks that are suitable for large installations with equipment rooms Distribution panels with branch circuits can be used economically with up to 8 HM 1Ss on a branch Contact Meyer Sound for in formation on tested and approved supplies Power Cable Requirements Each HM 1S draws a maximum of 3 Arms and 5 Apk from a 48 V power supply at peak SPL The cabling between the 48 V supply and the speaker adds resis tance to the circuit and produces a voltage drop at the speaker Decreasing the voltage at the speaker com promises the peak SPL so cable resistance should be minimized For best sonic performance avoid voltage drops greater than 8 V at the speaker Voltage drops greater than 15 V may cause the speaker to mute or distort The maxi mum round trip resistance for a cable attached to a single HM 1S should be no higher than 1 6 Q which keeps the voltage drop below 8 V during the maximum current draw of 5 Apk The following table helps select cable gauges for various cable lengths Maximum Cable Length for lt 8 V drop HM 1Ss at 18 AWG 16 AWG 14 AWG end of cabl
7. with a sub woofer TheAC adapter can be purchased through Meyer Sound and comes with two 10 ft power cables The AC adapter has two output connectors that are wired together inside the supply allowing either one connector to drive two speakers at the end of a single cable or one connector and cable per speaker An Do not connect the outputs of multiple PS 1 AC adapters together For installations up to 10 HM 1Ss using multiple PS 1 AC adapters is often the simplest and most cost effective solution Since the limited output power for each supply acts as circuit protection for light gauge cables it is not necessary to install circuit breaker distribution panels Using the PS 1 does however limit each 48 V line to two speakers The dimensions of the AC adapter are 10 x 5 x 3 Contact Meyer Sound for further information on the PS 1 AC Adapter Gg A Do not use a ground lifting adapter or cut the AC cable ground pin Power Supplies for Larger Systems If an installation includes more than 10 speakers or requires several speakers to operate from a single 48 V line a single high output power supply should be considered The following sections provide current and voltage specifications for the HM 1S s power requirements Current Ratings The wide dynamic range of audio signals normally causes a high peak to RMS ratio in an amplifiers DC supply currents The HM 1S has internal storage circuits to minimize the peak
8. 02 2204 USA conforms to the following Product Specifications Made by Meyer Sound Berkeley Ca U S A European Office Meyer Sound Germany Carl Zeiss Strasse 13 D 56751 Polch Germany Product Name Product Options HM 1S All Safety EN60065 1994 Environmental Specifications for Meyer EMC EN 55022 1987 Class A Sound Electronics Products IEC 801 2 1984 8kV IEC 801 3 1984 3 V m Operating temperature 0 C to 45 C IEC 801 4 1984 0 5 kV Signal Lines Nonoperating temp lt 40 C or gt 75 C 1 0 kV Power Lines Humidity to 95 at 35 C The product herewith complies with the requirements ofthe Operating altitude to 4600 m 15 000 ft Low Voltage Directive 73 23 EEC and the EMC Direc Nonoperating altitude to 6300 m 25 000 ft tive 89 336 EEC Shock 30g 11 msec half sine Office of Quality Manager on each of 6 sides Berkeley California USA Vibration 10 55 Hz 0 010 m April 1 1997 peak to peak excursion Ui usted U 3K59 C aL COMMERCIAL AUDIO SYSTEM Introduction The Meyer HM 1S Studio Monitor is a compact full range self powered reference monitor that employs a concentric tweeter mounting structure to achieve true point source performance Sophisticated phase correc tion circuitry provides superb imaging without the off axis cancellation effects back wave interference and IM dis tortion co
9. d 35 VDC minimum without shutoff Allowing operation down to 35 VDC provides two ben efits First a moderate voltage drop up to 8 V for long DC power cables has a minimal impact on audio perfor mance enabling the use of light gauge cables for most installations Second since some switched mode power supplies slowly foldback the voltage if they experience current limit power supplies with lower power current ratings can be used efficiently Since supplies with lower power ratings typically experience current limit when the HM 1S is at continuous limiting some voltage drop and loss of headroom is acceptable provided the voltage does not drop below 35 VDC At 35 V the maximum current draw is 25 lower than the values stated in the preceding tables NOTE If the HM 1S will not be driven at continuous limiting a power supply that satisfies the moderate specifications for voltage and current can be used safely without risk of sonic degradation or interruption It is important to understand how the selected power supply responds to current limit particularly for switched mode supplies Some supplies trip off and must be reset manually while others remain off for a period of time and reset automatically In both cases the HM 1S suffers audio interruption In the third and preferable case supplies that feature voltage foldback allow brief periods of current limit without audio interruption for this reason we recommend using
10. e ft m ft m ft m 1 125 38 0 200 61 0 330 100 6 2 63 19 2 100 30 5 165 50 3 3 42 12 8 67 20 4 110 33 5 4 32 9 8 50 15 2 66 20 1 5 25 Gel 40 12 2 63 19 2 Asingle HM 1S attached to a 100 ft 18 AWG cable 1 27 Q total produces a 6 4 VDC loss at the speaker 41 6 V during maximum audio bursts 5A 0 5 s This results in a small loss in peak SPL Audio Input The HM 1S has an input impedance of 10 kQ and receives its audio input signal at a female XLR connector Pins 2 and 3 carry the input as a differential signal pin 1 and the case are connected to the chassis The power and audio cables can be jacketed in the same sheath without induc ing noise to the input signal For best EMI immunity itis desirable to use a twisted pair shielded cable with the twisted pair connected to pins 2 and 3 and the shield to pin 1 However an unshielded twisted pair cable can be used effectively even if it is jacketed with the power cable The input is RF and ESD protected capacitive coupled 50 V common mode to ground 4 dBu nominal 21 dBu max Clipping occurs at the input at 12 Vpk The Common Mode Rejection Ratio CMRR is greater than 80 dB The HM 1S Subwoofer The low frequency response of an HM 1S can be extended down to 42 Hz if used with the HM 1S Subwoofer or placed next to a wall or ceiling half space loading Each HM 1S can power a subwoofer from the male 3 pin EN3 Sub
11. e ventilation To reduce the risk of AUTORIZADO A PERSONAL TECNICO fire or electric shock do not expose this device CALIFICADO Audio Input to rain or moisture Pin 1 Chassis GES Pin 2 B NEWB SERIAL NUMBER Pin3 O Model HM 1 34 48V 6A Fan Q Class 2 Wirlng may be used Audio Input Signal female XLR l Fan Output 2 pinterminalplug Circuit Breaker 6A Dimensions All units in inches HM 1S Front HM 1S Side HM 1S weighs 11 0 Ib 5 0 kg HM 1S Subwoofer weighs 33 Ib 15 kg Meyer Sound Laboratories Inc 2832 San Pablo Avenue Berkeley California 94702 Telephone 510 486 1166 FAX 510 486 8356 E mail techsupport meyersound com http Awww meyersound com 18 HM 1S Top 9 3 HM 1S Sub Side HM 1S Sub Front Meyer Sound Germany GmbH Carl Zeiss Strasse 13 D 56751 Polch Germany Telephone 26 54 96 00 58 FAX 26 54 96 00 59 E Mail meyersound t online de
12. i n apropiada ya sea un fusible o un disyuntor La conexi n a cualquier otro tipo de tomacorriente puede constituir peligro de descarga el ctrica y violar los c digos el ctricos locales No instale el altoparlante en lugares donde haya agua o humedad excesiva No deje que en el altoparlante entre agua ni ning n objeto extra o No ponga objetos con l quidos encima de la unidad ni cerca de ella Para reducir el riesgo de sobrecalentamiento no exponga la unidad a los rayos directos del sol ni la instale cerca de artefactos que emiten calor como estufas o cocinas Este altoparlante contiene niveles de voltaje peligrosos en potencia No intente desarmar la unidad pues no contiene piezas que puedan ser repardas por el usuario Las reparaciones deben efectuarse nicamente por parte del personal de mantenimiento capacitado en la f brica 17 Rear Panel Connectors Subwoofer Output male 3 pin EN3 connector Power Supply Input male 2 pin EN3 connector O O O ATTENTION ENTRETIEN ET REPARATIONS SubOut 48VDC CAUTIONS To reduce the risk of INTERNES NE SONT AUTORISEES QU AU Pin 1 Pin 2 i ee eee Ge weii Ee ee T 220k This surface may WARTUNG UND REPARATUR NUR DURCH reach high temperatures while in use ELEKTROFACHKRAFTE ae To ensure proper operation allow at AL assis least 6 inches clearance from this surface ATENCION acceso INTERNO SOLO and adequat
13. mmonly exhibited by dual concentric speakers The HM 1S Studio Monitor is a two way system comprising a 7 inch graphite cone low frequency driver and a concen trically mounted 1 inch soft dome high frequency driver Aconstant directivity high frequency horn affords a sym metric 100 beam width The HM 1S employs optimized electronics drivers and cabinet venting tuned to 40 Hz to achieve low frequency response far exceeding that of most small speakers The drivers are magnetically shielded and the magnets employ field cancelling techniques to minimize magnetic leakage allowing speaker place ment within one foot of color video monitors The HM 1S can be used with the Meyer HM 1S Studio Subwoofer extending the free field LF low frequency response down to 42 Hz The passive subwoofer is powered from the Sub output on the rear panel of the HM 1S Although each HM 1S Studio Monitor can power a subwoofer ample LF energy may be obtained by driving one subwoofer from two HM 1S Studio Monitors result ing in a correctly summed mono signal Subwoofer usage depends on the loading conditions the LF gain desired and whether a stereo LF signal is required Placing the HM 1S next to a wall or ceiling half space loading also extends the LF response down to 42 Hz The HM 1S Studio Monitor and Subwoofer cabinets are constructed from medium density fiberboard and fin ished with an attractive durable oak veneer natural wood or black Alth
14. on Connections Gray wire to pin 1 pin 2 no connection White wire to pin 3 Connections pin 1 no connection pin 2 no connection White wire to pin 3 HM 1S to HM 1S Subwoofer Cable Connector Assembly Procedure Boot Coupling Rin Cable SR 1 Cord Connector Cable Clamp Housing Contact Pins Step 1 Feed the end of the cable through the boot cable clamp housing and coupling ring in the order and position shown Cord Connector Dot pin 1 Cable pi a 3 8 Max indicator ees che Gel WS 7 32 2 Contact Pins 9 32 Step 2 FOR STEREO CABLES Strip cable as shown and begin soldering conductors to pins starting with the Gray wire to pin 1 pin 2 no connection and the White wire to pin 3 FOR MONO CABLES See wiring instructions on page 6 Cord Connector Cord Connector Coupling Ring Tab Step 3 Align coupling ring s tabs with cord connector s side notches and push the coupling ring onto cord connector Side notch Clamp Step 4 Clamp Loch Push the cable clamp housing foward until it locks into the connector body and snap the two clamps into their compartments Step 5 CP Push the boot all the way foward to seat tightly onto the cable clamp housing Subwoofer Performance Verification There are two methods of verifying that the phase relationship between the HM 1S and its subwoofer One method is free field the other is a ground plane measurement in half space Free
15. ough external heatsinks on the rear of the cabinet provide adequate convection cooling a variable speed cooling fan assembly part 40 039 016 01 driven from a rear panel output and mounted on the rear of the speaker is available if the HM 1S will be operated in hot temperatures or in an unventilated enclosed area The enclosure contains a 400 W stereo amplifier an active crossover frequency and phase alignment circuitry and driver protection voltage limiters Front panel LEDs indicate power signal limit and thermal overload and a rear panel circuit breaker provides overall DC power protection The HM 1S accepts a unipolar 48 VDC power source which may be supplied by the Meyer PS 1 AC Adapter Using a DC supply enables long power cable runs with minimal induced noise or hum which is particularly im portant for recording studios and other noise sensitive environments Power Requirements The HM 1S requires a 48 VDC external power supply which provides these benefits e Low voltage wiring simplifies installation e Utilizes telecom 48 V supply and bus standard e Eliminates 50 60 Hz AC noise coupling in wiring The power supply input uses a male 2 pin EN3 connector The HM 1S can be powered by the Meyer PS 1 AC adapter or a supply that conforms to the 48 VDC specifi cations detailed in this section Meyer PS 1 AC Adapter Using the Meyer PS 1 AC adapter is the simplest way to power a pair of HM 1Ss or a single HM 1S
16. sed in hot ambient temperatures or direct sunlight e the user wishes to avoid accidental contact with the heatsinks if the rear of the HM 1S is exposed The fans attach easily to the two bottom rear corners of the HM 1S Use a s2 Allen wrench to remove the bottom screws and install the left and right fans according to the diagram below The fans are shipped with a terminal plug keyed for insertion into the 2 pin fan output connector in the proper orientation only The fan speed is temperature controlled At a heatsink temperature of 25 C the fans turn on at half speed and increase speed linearly until reaching full speed at 75 C Protection and Limiting The front of the HM 1S has two LEDs that indicate power and limiter activity The right LED is green when power is ap plied This LED turns red if thermal limiting occurs de scribed in the section Cooling and Fan Installation until the temperature decreases to 75 C The left LED indicates driver limiter activity with a vari able intensity red color full illumination occurs at thermal limiting Rigging A Do not drill into the HM 1S Cabinet The HM 1S is not designed for use with rigging systems For rigging needs Use the Standard Contractors version HM 1 cabinets which can be easily fitted for omni mounts and other rigging options
17. tact Meyer Sound Technical Support for assistance Half Space To verify the system performance in half space you must perform a ground plane measurement This type of measurement is not desirable for system calibration and should only be used to verify the performance of the subwoofer Place the HM 1S next to the subwoofer on the flat ground and position the calibrated measurement microphone one meter on axis from the tweeter of the HM 1S as pictured below Using noise or other broadband test signal perform a transfer function of the HM 1S Start with the subwoofer disconnected 12 HM 1S on axis at 1 meter ground plane This represents a typical ground plane response of the HM 1S on axis at 1 meter Keep in mind that any surface close to the test space can create reflections which will change the response of the speaker Connect the subwoofer to the HM 1S and measure the combined response of the system 13 HM 1S with in phase Subwoofer on axis at 1 meter ground plane This represents a typical ground plane response of the HM 1S and subwoofer in phase at 1 meter This response indicates a complementary phase relationship between the HM 1S and subwoofer 14 If the subwoofer is out of phase the combined response will have a significant loss of energy compared to the overall response at around 82 Hz as illustrated below HM 1S with out of phase Subwoofer on axis at 1 meter ground plane This represents a typical
18. to average ratio which reduces the peak power rating required by the supply e allows efficient use of switched mode power sup plies which have similar peak and continuous rat ings The following table lists the current and power draw for a single HM 1S at light moderate and maximum operating levels Current and Power Draw for 1 HM 1S RMS Peak RMS Peak Operati nieve Current Current Power Power Light no limiting Moderate Occasional Limiting Maximum continuous limiting Each HM 1S draws 0 4 ADC 20 W in a quiescent state The RMS current is measured over a 500 ms integration time The peak current is measured over a 10 ms integration time Each HM 1S can drive a slaved Meyer subwoofer from a connection on the amplifier panel Adding the subwoofer increases the amplifier s output current which increases the power supply current The current and power ratings for an HM 1S and a subwoofer are listed in the following table at light moderate and maximum operating levels Current and Power Draw for 1 HM 1S with Subwoofer RMS Current Peak Current RMS Power Peak Operating Level Power Light no limiting Moderate occasional limiting Maximum Se 3 continuous limiting An HM 1S with subwoofer draws 0 4 ADC 20 Win a quiescent state Voltage Ratings The voltage operating range for the HM 1S is 48 VDC nominal 52 VDC absolute maximum an
19. tre munie d une protection ad quate fusible ou coupe circuit Le branchement dans tout autre genre de prise pourrait entra ner un risque d lectrocution et peut constituer une infraction la r glementation locale concernant les instal lations lectriques Ne pas installer l haut parleur dans un endroit o il y a de l eau ou une humidit excessive Ne pas laisser de l eau ou tout objet p n trer dans l haut parleur Ne pas placer de r cipients contenant un liquide sur cet appareil ni proximit de celui ci Pour viter une surchauffe de l haut parleur conservez la labri du soleil Ne pas installer proximit d appareils d gageant de la chaleur tels que radiateurs ou appareils de chauffage Ce haut parleur contient des circuits haute tension pr sentant un danger Ne jamais essayer de le d monter Il n y a aucun composant qui puisse tre r par par l utilisateur Toutes les r parations doivent tre effectu es par du personnel qualifi et agr par le constructeur Deutsch Um die Gefahr eines elektrischen Schlages auf ein Minimum zu reduzieren den Lautsprecher vom Stromnetz trennen bevor ggf ein Audio Schnittstellensignalkabel angeschlossen wird Das Netzkabel erst nach Herstellung aller Signalverbindungen wieder einstecken Der Lautsprecher an eine geerdete zweipolige Dreiphasen Netzsteckdose anschlie en Die Steckdose mu mit einem geeigneten Abzweigschutz Sicherung oder Leis
20. tungsschalter verbunden sein Der Anschlu der unterbrechungsfreien Stromversorgung an einen anderen Steckdosentyp kann zu Stromschl gen f hren und gegen die rtlichen Vorschriften versto en Der Lautsprecher nicht an einem Ort aufstellen an dem sie mit Wasser oder berm ig hoher Luftfeuchtigkeit in Ber hrung kommen k nnte Darauf achten da weder Wasser noch Fremdk rper in das Innere den Lautsprecher eindringen Keine Objekte die Fl ssigkeit enthalten auf oder neben die unterbrechungsfreie Stromversorgung stellen Um ein berhitzen dem Lautsprecher zu verhindern das Ger t vor direkter Sonneneinstrahlung fernhalten und nicht in der N he von w rmeabstrahlenden Haushaltsger ten z B Heizger t oder Herd aufstellen Im Inneren diesem Lautsprecher herrschen potentiell gef hrliche Spannungen Nicht versuchen das Ger t zu ffnen Es enth lt keine vom Benutzer reparierbaren Teile Reparaturen d rfen nur von ausgebildetem Kundenienstpersonal durchgef hrt werden Espa ol Para reducir el riesgo de descarga el ctrica desconecte de la red el altoparlante antes de instalar el cable de se alizaci n de interfaz de la segnale Vuelva a conectar el conductor flexible de alimentaci n solamente una vez efectuadas todas las interconexiones de se alizatci n Conecte el altoparlante a un tomacorriente bipolar y trifilar con neutro de puesta a tierra El tomacorriente debe estar conectado a la protecci n de derivac
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