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Meyer Sound HM-1S manual

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Table of contents for the manual

  • Page 1

    Patents Pending Operating Instructions HM-1S Self-Powered S tudio Monitor Copyright © 1998 Meyer Sound Laboratories, Inc. All rights reserved Part # 05.059.004.01 Rev A2[...]

  • Page 2

    2 Introduction .......................................................... 3 Power Requirements ............................................ 3 Power Cable Requirements .................................. 5 Audio Input ........................................................... 5 The HM-1S Subwoofer ......................................... 5 Cooling [...]

  • Page 3

    3 Introduction The Meyer HM-1S S tudio 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 effect s, back-wave interference, and IM dis- tor[...]

  • Page 4

    4 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 ran[...]

  • Page 5

    5 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 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[...]

  • Page 6

    6 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 V erification section on page 10 of this [...]

  • Page 7

    7 HM-1S to HM-1S Subwoofer Cable Connector Assembly Procedure Cable Boot Cord Connector Cable Clamp Housing Contact Pins Coupling Ring Step 1: Feed the end of the cable through the boot, cable clamp housing, and coupling ring in the order and position shown. Cable 3/8" Max. 7/32" Step 2: FOR STEREO CABLES: Strip cable as shown and begin s[...]

  • Page 8

    8 Subwoofer Performance V erification 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 Field: Place the HM-1S directly above and coplanar to the subwoofer as pictured below: Place a calibrated measurement micropho[...]

  • Page 9

    9 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 on axis at 1 meter , free field.[...]

  • Page 10

    10 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. HM-1S with in-phase subwoofer on axis at 1 meter , free field.[...]

  • Page 11

    11 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.[...]

  • Page 12

    12 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 contact Meyer Sound Technical Support for assistance. Half Sp ace: To verify the system [...]

  • Page 13

    13 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. HM-1S on axis at 1 meter , ground plane.[...]

  • Page 14

    14 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.[...]

  • Page 15

    15 HM-1S with out-of-phase Subwoofer on axis at 1 meter , ground plane. 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: This represents a typical ground plane response of the HM-1S and subwoofer out-of-phase, in a ground plane enviro[...]

  • Page 16

    16 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 [...]

  • Page 17

    17  T o 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 recept acle must be connected to a fuse or circuit breaker . Connection t[...]

  • Page 18

    18 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://www.meyersound.com Dimensions All units in inches HM-1S weighs 11.0 lb (5.0 kg); HM-1S Subwoofer weighs 33 lb (15 kg) Rear Panel Connectors Meyer Sound Germany GmbH Carl Zeiss[...]