Instruction/ maintenance manual of the product HM-1S Meyer Sound
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Patents Pending Operating Instructions HM-1S Self-Powered S tudio Monitor Copyright © 1998 Meyer Sound Laboratories, Inc. All rights reserved Part # 05.
2 Introduction .......................................................... 3 Power Requirements ............................................ 3 Power Cable Requirements .................................. 5 Audio Input ...................................
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 a.
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.
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.
18 Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, California 94702 Telephone: 510 - 486 - 1166 FAX: 510 - 486 - 8356 E-mail: techsupport@meyersound.
An important point after buying a device Meyer Sound HM-1S (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Meyer Sound HM-1S yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Meyer Sound HM-1S - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Meyer Sound HM-1S you will learn all the available features of the product, as well as information on its operation. The information that you get Meyer Sound HM-1S will certainly help you make a decision on the purchase.
If you already are a holder of Meyer Sound HM-1S, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Meyer Sound HM-1S.
However, one of the most important roles played by the user manual is to help in solving problems with Meyer Sound HM-1S. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Meyer Sound HM-1S along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
