Meyer Sound HIGH DEFINITION AUDIO MONITOR HD-1 User manual

Keep these important operating instructions.
Check www.meyersound.com for updates.
OPERATING INSTRUCTIONS CINE-STUDIO
HD-1 High Definition Audio Monitor


ii
© 1994, 2015 
Meyer Sound. All rights reserved.
HD-1 Operating Instructions, PN 05.550.026.01 B
The contents of this manual are furnished for informational purposes only, are subject to change without notice, and should not be con-
strued as a commitment by Meyer Sound Laboratories Inc. Meyer Sound assumes no responsibility or liability for any errors or inaccura-
cies that may appear in this manual. Except as permitted by applicable copyright law, no part of this publication may be reproduced,
stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, recording or otherwise, without prior writ-
ten permission from Meyer Sound.
Meyer Sound and the Meyer Sound wave logo are registered trademarks of Meyer Sound Laboratories Inc. (Reg. U.S. Pat. & Tm. Off.). All
third-party trademarks mentioned herein are the property of their respective trademark holders.

iii
CONTENTS
Chapter 1: Introduction 5
How to Use This Manual 5
HD-1 Monitor 5
Obtaining Service 6
Chapter 2: HD-1 Setup 7
AC Power 7
Input Connector 8
Input Level 8
Turn-on Sequence 9
On/Limit LED 9
Calibration Port 9
Chapter 3: HD-1 Placement 11
Appendix A: AC Power Reference 13
Appendix B: Troubleshooting 15
Appendix C: HD-1 Specifications 17

CONTENTS
iv

5
CHAPTER 1: INTRODUCTION
HOW TO USE THIS MANUAL
Make sure to read these instructions in their entirety before
configuring a Meyer Sound loudspeaker system. In particu-
lar, pay close attention to material related to safety issues.
As you read these instructions, you will encounter the fol-
lowing icons for notes, tips, and cautions:
NOTE: A note identifies an important or useful
piece of information relating to the topic under
discussion.
TIP: A tip offers a helpful tip relevant to the topic
at hand.
CAUTION: A caution gives notice that an
action may have serious consequences and
could cause harm to equipment or personnel, or
could cause delays or other problems.
Information and specifications are subject to change.
Updates and supplementary information are available at
www.meyersound.com.
Meyer Sound Technical Support is available at:
■Tel: [phone]
■Tel: [phone] (after hours support)
■Web: www.meyersound.com/support
■Email: [email protected]
HD-1 MONITOR
The HD-1 high definition audio monitor is a self-powered
loudspeaker designed for ultra-precise near-field monitor-
ing. Optimized to approximate a point-source radiator, the
HD-1 yields exceptionally broad directivity with a generous
sweet spot. Its patented circuitry minimizes time delay
response and deviations from linear phase.
The HD-1 incorporates a 2-channel power amplifier and a
sophisticated active crossover with optimized pole-zero fil-
ters for acoustical transparency and a flat frequency
response. The power amplifier features complementary
MOSFET output stages and operates at class A at low to
moderate levels (less than 90 dB SPL) and class AB at high
levels.
The HD-1 delivers a high peak SPL with a dynamic range of
over 100 dB, with extremely low distortion. Its free-field fre-
quency response is flat (within ±1 dB) from 40 Hz to 20 kHz,
with each unit being individually calibrated at Meyer Sound’s
Berkeley, California factory. The HD-1 has an active, bal-
anced input that is switchable between a +4 dBu and 
–10 dBV nominal operating level.
!
HD-1 High Definition Audio Monitor

CHAPTER 1: INTRODUCTION
6
The HD-1’s transducers include a low-frequency 8-inch
cone driver and a high-frequency 1-inch soft dome tweeter.
The low-frequency driver’s ample magnet and 2-inch voice
coil yield high efficiency with rapid heat dissipation. The
tweeter employs a silk-infused dome that affords smooth
frequency response while minimizing breakup and color-
ation. The proprietary drivers are housed in a vented cabinet
and individually tested for maximum linearity and low distor-
tion.
OBTAINING SERVICE
The HD-1 monitor is protected by Meyer Sound’s Limited
3-Year Warranty. For complete information regarding terms
and conditions, refer to the printed warranty statement
packed with the system.
To obtain service:
1. Contact your Meyer Sound dealer or contact Meyer
Sound Customer Service.
2. If you are calling Meyer Sound, have the HD-1 serial
number handy and be prepared to describe the problem
clearly and completely.
3. If the problem cannot be resolved over the phone, you
must return the unit for service. You will be assigned an
RA (Return Authorization) number for job tracking. Refer
to this number on shipping materials and in all corre-
spondence concerning the repair. Shipping charges are
the responsibility of the purchaser.

7
CHAPTER 2: HD-1 SETUP
AC POWER
The HD-1’s Voltage Selector switch, fuse, AC Mains inlet,
and power switch are located on its rear panel.
Voltage Selector
The HD-1 accepts AC voltages from 90 to 250 V AC at 50 to
60 Hz in four ranges (100, 120, 220, or 240 Hz), as deter-
mined by the Voltage Selector switch. The HD-1 ships in the
following configurations:
■UL, Voltage Selector set to 120 V, 6.3 A fuse installed
■CE, Voltage Selector set to 220 V, 3.15 A fuse installed
CAUTION: Before pugging in the HD-1’s AC
power cable, make sure to set the Voltage
Selector switch to the range appropriate for the local
AC mains voltage.
CAUTION: Do not adjust the Voltage Selector
switch while the AC power cable is plugged in
to an outlet.
Fuse
The HD-1 is protected by a fast-acting fuse in the Voltage
Selector switch. In the unlikely event that the fuse blows,
check the line voltage and Voltage Selector setting. Always
replace the fuse with one of the same type and rating. For
more information, see Table 1 on page 13.
AC Power Cable
The HD-1 ships with a shielded, three-wire AC power cable.
The HD-1 must be connected to a grounded (three-prong)
outlet. To operate safely and effectively, it is extremely
important that the unit be properly grounded. If possible,
connect both HD-1s to the same outlet.
CAUTION: Set the Voltage Selector switch to
the local AC voltage range before plugging in
the AC power cable.
HD-1 High Definition Audio Monitor, Front and Rear Panel
High
Definition
Audio
Monitor
100
240
220
120
PUSH
Pin 1 Com
Pin 2
-
Pin 3 +
Case AC Gnd
Input
Level
Input
+4dBu
- 10dBv
Off
On
AC
90V ~ 110V
109V ~ 130V
200V ~ 235V
230V ~ 250V
100V
120V
220V
240V
6.3 A-FastAct
6.3 A-FastAct
3.15A-FastAct
3.15A-FastAct
Line Fuse Volt
Select
6.3A 90-130 V
3.15A 200-250 V
~
~
Calibration port for factory and service use only
Low frequency
cone driver
High frequency
dome tweeter
On/Limit LED
Calibration port
(factory use only)
Voltage Selector
switch
Input Level
switch
Input
connector
AC Mains
inlet
Power
switch
!
!
!

CHAPTER 2: HD-1 SETUP
8
AC Power Cable Wiring
When wiring international or special-purpose AC power
cables, use the following wiring scheme:
Electrical Safety Guidelines
Pay close attention to these important electrical and safety
guidelines.
■The HD-1 requires a grounded outlet. Always use a
grounded outlet and plug.
■Do not use a ground-lifting adapter or cut the AC power
cable ground pin.
■Make sure the AC power cable for the loudspeaker has
the appropriate power plug for the area in which you will
operate the loudspeaker.
■Do not operate the unit if the power cable is frayed or
broken.
■The AC power connector must not be engaged or disen-
gaged when under load or live.
■Keep all liquids away from the HD-1 to avoid hazards
from electrical shock.
INPUT CONNECTOR
The HD-1 receives audio from its XLR 3-pin female Input
connector, which uses the following wiring:
■Pin 1 — Audio common
■Pin 2 — Signal (–)
■Pin 3 — Signal (+)
■Case — Earth (AC) ground
The Input connector accepts 10 kOhm balanced audio sig-
nals. Make sure to use standard XLR audio cables, with all
three pins connected on both ends, for balanced audio sig-
nals. Unbalanced audio signals require an inline adapter.
CAUTION: Shorting an Input connector pin to
the case may cause a ground loop, resulting in
hum.
NOTE: Meyer Sound offers an optional RCA
male to XLR 3-pin male audio cable for con-
necting to source devices with RCA outputs.
INPUT LEVEL
The Input Level switch determines the input sensitivity for
source signals connected to the HD-1’s Input connector.
The Input Level can be set to:
■+4 dBu (1.23 V rms = 114 dB SPL rms): Select this
option for balanced audio signals, usually from profes-
sional audio equipment.
■–10 dBV (0.32 V rms = 114 dB SPL rms): Select this
option for unbalanced audio signals, usually from con-
sumer or semi-professional audio equipment.
NOTE: Setting the Input Level to –10 dBV
when receiving a +4 dBu source signal will
result in increased noise.
AC Wiring Scheme
Wire Color Attach to the
Following
Term inal
U.S. / Canada
60 Hz
European
50 Hz
Black Brown Hot or live (L)
White Blue Neutral (N)
Green Green and Yellow Protective earth /
ground (E or PE)
U.S./Canada, 60 Hz
Black (L)
Europe, 50 Hz
Green (E)
White (N)Brown (L)Blue (N)
Green/
yellow (E)
Earth ground
Chassis ground
!

HD-1 OPERATING INSTRUCTIONS
9
TURN-ON SEQUENCE
When powering up the HD-1s and their source device, use
the following sequence:
1. Set the volume for the source device to minimum.
2. Turn on the source device.
3. Turn on the HD-1s. The power switch is located on the
rear panel next to the AC Mains inlet. The On/Limit LED
on the front panels light up.
4. Adjust the volume for the source device as necessary.
ON/LIMIT LED
Under normal operation, the front panel On/Limit LED is
green. At higher listening levels, the LED may flash red
during program peaks, indicating the onset of overloading,
where the unit’s limiters engage. If the LED turns red and
stays red, reduce the source level. If the LED stays solid red
for extended periods, thermal damage may result.
The HD-1 performs within its acoustical specifications at
normal temperatures when the On/Limit LED is green, or if
the LED turns red for two seconds or less and then returns
to green for at least one second. If the LED remains red for
longer than three seconds, the HD-1 enters hard limiting
where:
■Increases to the input level have no effect.
■Distortion increases due to clipping and nonlinear driver
operation.
■The drivers are subjected to excessive heat and excur-
sion, which will compromise their lifespan and may even-
tually lead to damage over time.
CALIBRATION PORT
The HD-1 Calibration port is for factory use only. Do not
apply external voltages to any connector pins for this port.

CHAPTER 2: HD-1 SETUP
10

11
CHAPTER 3: HD-1 PLACEMENT
The HD-1 is designed for near field operation. The best lis-
tening distance is between 3 and 8 feet from the front of the
monitor. The HD-1 is aligned for a flat frequency response in
free field (no adjacent boundary surfaces). If possible, place
the monitors at least 3 feet from any nearby walls or corners.
Placing the monitors next to a wall or on the floor will cause
low frequencies to be exaggerated. All nearby surfaces
(such as mixing consoles) should be angled to minimize
reflections toward the listener.
To obtain the best stereo performance, place the HD-1s as
shown in Figure 1, with the two monitors forming an equilat-
eral triangle with the listening position.
The HD-1 is calibrated so that the best sound quality is
obtained on the tweeter axis or slightly above. Adjust the
height of the monitors so that the listening position lies as
shown in Figure 2.
When using loudspeaker stands, which are recommended,
make sure the stands can safely support the weight of the
monitor (51 lbs). For recording studios, the monitors can be
placed on the bridge of mixing boards; make sure the bridge
can support the weight of the monitors.
You can also place HD-1s on a shelf or soffit. When doing
so, make sure the shelf can support the weight of the moni-
tors. Place the monitors near the ends of the shelf, where
the support is strongest, with the tweeters oriented in and
the front flush with the shelf edge. Leave at least 6 inches of
space above and behind the monitors to allow for proper
ventilation.
CAUTION: Always allow at least 6 inches
clearance above and behind the HD-1 to allow
for proper ventilation.
CAUTION: When handling the HD-1, avoid
touching or pressing the dome tweeter. If the
dome becomes dented, the unit should be returned
for testing and calibration, even if the dome pops
back into position.
Figure 1: Optimum Stereo Placement for HD-1
Listening
position
3–8 feet3–8 feet
3 feet
Wall
3–8 feet
Figure 2: HD-1 Listening Position on Tweeter Axis
HD-1 Placement on Shelf
Tweeter axis Listening
position
3–8 feet
High Definition Audio Monitor
High Definition Audio Monitor
!
!

CHAPTER 3: HD-1 PLACEMENT
12

13
APPENDIX A: AC POWER REFERENCE
The HD-1 monitor is equipped with an international standard
IEC 320 AC Mains inlet. This convenient receptacle accepts
a variety of power cable types to accommodate mains out-
lets around the world.
The HD-1 must have the correct power cable, voltage set-
ting, and fuse for the AC power source in your area. To avoid
electrical shock and damage, use only a cable specified by
Meyer Sound, or an equivalent cable that satisfies the
requirements of the local safety testing agency.
CAUTION: To avoid damage to the HD-1,
check the rear panel Voltage Selector switch
and fuse before plugging in the unit and applying
power. Set the Selector Switch to the local AC volt-
age and, if necessary, replace the fuse with one that
is rated for your area. Always unplug the HD-1 power
plug before adjusting the Voltage Selector switch.
HD-1 AC POWER RATINGS
Table 1 lists the AC power connector, voltage setting, and
fuse rating to use with the HD-1 in each country.
IEC 320 Connector
HD-1 Rear Panel
100
240
220
120
PUSH
Pin 1 Com
Pin 2
-
Pin 3 +
Case AC Gnd
Input
Level
Input
+4dBu
- 10dBv
Off
On
AC
90V ~ 110V
109V ~ 130V
200V ~ 235V
230V ~ 250V
100V
120V
220V
240V
6.3 A-FastAct
6.3 A-FastAct
3.15A-FastAct
3.15A-FastAct
Line Fuse Volt
Select
6.3A 90-130 V
3.15A 200-250 V
~
~
Calibration port for factory and service use only
100
240
220
120
Fuse cap
Voltage Selector switchPower switch AC Mains inlet
!
Table 1: Worldwide AC Power Ratings
Country Connector Voltage
Setting
Fuse
Rating
Australia, New Zealand,
Fiji, Papua New Guinea,
People’s Republic of
China
240 V 3.15 A
Germany, Austria, Nor-
way, Sweden, Finland,
Netherlands, Belgium,
France, Portugal, Spain
220 V 3.15 A
Denmark
Note: To avoid risk of
shock, the Continental
Europe plug (previous
entry) should not be used
in Denmark.
220 V 3.15 A
India, Ghana, Kenya,
Nigeria, Kuwait, Qatar,
Hong Kong, other parts
of Asia and the Far East
220 V 3.15 A
Israel 220 V 3.15 A
Italy, parts of North Africa
Note: Several types of
plugs are used in Italy;
the one shown here is the
official standard.
220 V 3.15 A
Japan
Note: Earth ground not
provided. Use a ground
adapter with the ground-
ing strap attached to the
outlet’s center screw.
100 V 6.3 A
United Sates, Canada,
Mexico and Central
America, parts of Korea,
Taiwan, west coast of
South America
120 V 6.3 A

APPENDIX A: AC POWER REFERENCE
14
REPLACING THE HD-1 FUSE
In the unlikely event that the HD-1 fuse blows, you can eas-
ily replace it. The HD-1 requires a 5 x 20 mm quick-acting
fuse that conforms to IEC 127/II, SEV 1064, DIN 41661, and
BS 4265. The fuse must also be UL, VDE, SEMCO, and
BEAB approved.
The following fuses are available from Meyer Sound:
■Time Lag Fuse, 3.15 A, 250 V, 5 x 20 mm
■Time Lag Fuse, 6.30 A, 250 V, 5 x 20 mm
CAUTION: Always replace the HD-1 fuse with
one that is rated for your area. For more infor-
mation, see Table 1 on page 13.
To replace the HD-1 fuse:
1. Insert a flat-blade screwdriver in the fuse cap and gently
turn counterclockwise. The fuse is released from its
socket.
2. Insert the replacement fuse.
3. Insert a flat-blade screwdriver in the fuse cap and gently
turn clockwise to tighten it.
Switzerland 220 V 3.15 A
United Kingdom, Ireland 220 V 3.15 A
Table 1: Worldwide AC Power Ratings
Country Connector Voltage
Setting
Fuse
Rating
!

15
APPENDIX B: TROUBLESHOOTING
Table 2: HD-1 Troubleshooting
Problem Symptoms Possible Cause Action
No sound
Power switch on but switch not lit Bad AC connection Check AC outlet and power cable.
Power switch on and lit but LED not lit Blown fuse Replace fuse. Check Voltage Selector
switch and AC line.
Power switch on and lit, LED lit Signal source disconnected Check input cables, connections, and
source signal.
Distorted
sound with
hum
Voltage Selector switch incorrectly set
Power down the HD-1 and check the Volt-
age Selector switch setting and AC voltage
output.
Voltage Selector switch correct Power brownout
Power down the HD-1 and check the AC
voltage output. If low, contact the power
company.
Low sound
levels
Source signal level too low Increase source device output.
Input Level switch incorrectly set Set Input Level switch to –10 dBV.
Hiss
Input Level switch incorrectly set Check Input Level switch and source
device output.
Input Level switch correctly set Program material Stop playback. If hiss disappears, check
program material.
Program material okay Source device malfunction Unplug HD-1 Input connector. If hiss disap-
pears, check source device.
Distorted or
intermittent
sound
Bad input connection Check input cables and connections.
Input cables and connections okay Source device malfunction Try another source device. If problem
stops, replace or repair bad source device.

APPENDIX B: TROUBLESHOOTING
16

17
APPENDIX C: HD-1 SPECIFICATIONS
ACOUSTICAL
Frequency Response 32 Hz – 22 kHz
Note: Subject to room loading. Specified for 8 feet actual distance between HD-1 cabinet and a single
boundary surface.
Free Field 32 Hz – 22 kHz at –3 dB
40 Hz – 20 kHz ±1 dB
Note: 1/3-octave resolution.
Maximum Peak SPL 125 dB peak (120 dB at 1 meter)
Signal to Noise Ratio >110 dB (noise floor 20 dBA @ 1 meter)
Coverage 60 degrees symmetrical
Crossover Optimized pole-zero filters to complement transducer response and to achieve acoustical transparency
and flat phase
Note: Unless otherwise specified, all acoustical measurements are performed at 1/2 meter from front baffle on tweeter axis. Acoustical
decibels are specified re 20 uPa.
TRANSDUCERS
Low Frequency One 8-inch cone driver
High Frequency One 1-inch dome tweeter
AUDIO INPUT
Type 10 kOhm impedance, electronically balanced
Connector XLR 3-pin female
Nominal Input Level +4 dBu or –10 dBV, switchable
AMPLIFIER
Type 2-channel complementary MOSFET output stages
(class A at low to moderate levels; class AB at high levels)
Output Power 225 W (low frequency, 150 W; high frequency, 75 W)
Note: Amplifier wattage rating based on the maximum unclipped burst sine-wave rms voltage that the
amplifier will produce for at least 0.5 seconds into the nominal load impedance.
THD, IM TIM <.02%
AC POWER
Connector 3-pin IEC male receptacle
Voltage Selection Selector switch for 100, 120, 220, and 240 V AC; 50–60 Hz
Safety Rated Voltage
Range
90–250 V AC, 50–60 Hz
Note: Safety agency rated voltage range under normal operating conditions.
Current Draw
Idle 0.40 A rms (120 V AC); 0.23 A rms (220 V AC); 0.47 A rms (100 V AC)
Maximum Long-Term
Continuous
1.15 A rms (120 V AC); 0.62 A rms (220 V AC); 1.32 A rms (100 V AC)
Burst 1.82 A rms (120 V AC); 0.99 A rms (220 V AC); 2.16 A rms (100 V AC)
Maximum Instantaneous
Peak
5.60 A peak (120 V AC); 3.20 A peak (220 V AC); 6.05 A peak (100 V AC)

APPENDIX C: HD-1 SPECIFICATIONS
18
HD-1 DIMENSIONS
COMPLIANCE
PHYSICAL
Enclosure Oak veneer
Finish Smooth medium-gloss black
Dimensions 12.00 inches W x 16.00 inches H x 16.39 inches D (+ 0.5 inches for HF dome clearance)
(305 mm x 406 mm x 416 mm)
Weight 51 lbs (23.1 kg)
ENVIRONMENTAL
Operating Temperature 0° C to +45° C
Non Operating
Temperature
–40° C to +75° C
Humidity To 95% at 45° C (non-condensing)
Operating Altitude To 5,000 m (16,404 ft)
Non Operating Altitude To 12,000 m (39,000 ft)
Shock 30 g 11 msec half-sine on each of 6 sides
Vibration 10 Hz – 55 Hz (0.010 m peak-to-peak excursion)
HD-1 Dimensions
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Meyer Sound Laboratories Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
+1 510 486.1166
www.meyersound.com
®
© 1994, 2015
Meyer Sound. All rights reserved.
HD-1 Operating Instructions
PN 05.550.026.01 B