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Meyer Sound CQTM Series manual

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Table of contents for the manual

  • Page 1

    Patents Pending The CQ ™ Series self-powered loudspeakers contain independent amplifier and control electronics for one 15” bass-reflex cone driver and one 4” diaphragm horn driver in a compact enclosure. This integrated design eliminates amplifier racks, simplifies setup and installation, an d improves durability and reliability. The CQ Seri[...]

  • Page 2

    2 ! Pour indiquer les risques résultant de tensions dangereuses Zu die gefahren von gefährliche spanning zeigen Important operating instructions Pour indequer important instructions Zu wichtige betriebs- anweisung und unter- haltsanweisung zeigen Frame or chassis Masse, châssis Rahmen oder chassis Protective earth ground Terre de protection Die [...]

  • Page 3

    3 Controls and Connectors .................................. 3 Dimensions ........................................................ 3 AC Power ........................................................... 4 Audio Input ........................................................ 5 Limiting and Protection Circuitry ..................... 6 Rigging .........[...]

  • Page 4

    4 AC Power The AC voltage operating ranges for the CQ Series are 85–134 V and 165–264 V, at 50 or 60 Hz. The CQ Series performs surge suppression for high voltage transients and can safely withstand voltages up to 275 VAC. Continuous voltages above 275 VAC may damage the unit! The Intelligent AC power supply protects the drivers and amplifier c[...]

  • Page 5

    5 Safety Issues Pay close attention to these important electrical and safety issues. Use a power cord adapter to drive the CQ from a standard 3-prong outlet ( NEMA 5-15R; 125 V max). earth ground chassis ground The CQ requires a grounded outlet. Always use a grounding adapter when connecting to ungrounded outlets. Do not use a ground-lifting adapte[...]

  • Page 6

    6 Limiting and Protection Circuitry TruPower Limiting ™ System Conventional limiters assume that the resistance of a speaker remains constant and set the limiting threshold by measuring voltage only. This method is inaccurate because the speaker’s resistance changes in response to the frequency content of the source material and thermal variati[...]

  • Page 7

    7 Fans and Cooling System The CQ uses a forced-air cooling system with two fans to prevent the amplifiers from overheating. A variable- speed primary fan runs continuously with an inaudible operating noise of 22 dBA at 1 m at its slowest speed. The speed of the primary fan begins increasing when the temperature of the heatsinks reaches 4 2 ° C. T [...]

  • Page 8

    8 Complete Systems Speaker Placement and Polarity The cabinets in the following example configurations are in a close-proximity coplanar orientation, unless otherwise stated. Placing the mid-hi speaker more th a n 5 feet from the subwoofer may require setting th e speakers to opposite polarities to compensate for the propagation delay between them.[...]

  • Page 9

    9 LD-1A with CQ and 650-P Activating the Lo Cut filter on the LD-1A for the Mid-H i output also eliminates the low frequency rise caused by the overlap between the CQ and 650-P. Although a typical CQ : 6 50-P ratio is 2 : 1 , separate Sub and Mid-Hi level controls on the LD-1A allow the ratio to vary while maintaining control of the spectral balanc[...]

  • Page 10

    10 V erifying Polarity Incorrect driver polarity impairs system performance and may damage the drivers. All Meyer Sound loudspeakers are shipped with the drivers in correct alignment. However, if the driver or circuit wiring has been removed or disassembled in any loudspeaker in a system for any reason, check the polarity between adjacent loudspeak[...]

  • Page 11

    11 Coverage Angles and Polar Plots Coverage Angles The coverage angles for the CQ Series over a wide frequency range are summarized in the following table: s e l g n A e g a r e v o C s e i r e S Q C l a t n o z i r o h 1 l a c i t r e v 2 ) s t n i o p B d 6 – ( 1 - Q C 0 8 ° 0 4 ° ) s t n i o p B d 0 1 – ( 1 - Q C 0 0 1 ° 0 5 ° ) s t n i [...]

  • Page 12

    12 CQ-1: 125 Hz CQ-1: 250 Hz CQ-1: 1 kHz CQ-1: 500 Hz CQ-1: 4 kHz CQ-1: 2 kHz CQ-1: 8 kHz CQ-1: 16 kHz vertical vertical vertical CQ-1 Polar Plots Inner plot is vertical unless otherwise indicated.[...]

  • Page 13

    13 CQ-2: 4 kHz CQ-2: 2 kHz CQ-2: 125 Hz CQ-2: 1 kHz CQ-2: 500 Hz CQ-2: 250 Hz CQ-2: 8 kHz CQ-2: 16 kHz vertical vertical vertical CQ-2 Polar Plots Inner plot is vertical unless otherwise indicated.[...]

  • Page 14

    14 Array Design Creating an effective array with the CQ requires a precise understanding of how to combine the coverage area and SPL of the individual speaker with those of adjacent speakers. Array design is a trade-off between increasing on-axis power and creating smooth transitions between the coverage areas of adjacent speakers. As the splay ang[...]

  • Page 15

    15 • To reduce the risk of electric shock, disconnect the loud- speaker from the AC mains before installing audio cable. Reconnect the power cord only after making all signal connections. • Connect the loudspeaker to a two-pole, three wire ground- ing mains receptacle. The receptacle must be connected to a fuse or circuit breaker. Connection to[...]

  • Page 16

    16 Complementary power MOSFET output stages class AB/H 1240 Watts (620 Watts/channel) < .02 % Acoustical Copyright © 1997 Meyer Sound Laboratories, Inc. All rights reserved Part # 05.041.010.01 Rev A ± 4 dB 40 Hz – 18 kHz ± 90 ° 50 Hz – 16 kHz CQ-1 : 136 dB ; CQ-2 : 139 dB > 110 dB Specifications Frequency Response 1 Phase Response 1 [...]