Meyer Sound Self Powered Loudspeaker Hm 1 Users Manual Hm1.pmd

HM-1 to the manual 575a7a3f-aa4b-40bd-8eab-19a17dbd49fc

: Meyer-Sound Meyer-Sound-Self-Powered-Loudspeaker-Hm-1-Users-Manual-555560 meyer-sound-self-powered-loudspeaker-hm-1-users-manual-555560 meyer-sound pdf

Open the PDF directly: View PDF .
Page Count: 2

Download
Open PDF In Browser	View PDF

HM-1

Self-Powered Loudspeaker

FEATURES
Bi-amplified

Integrated electronics

Dual-concentric drivers

Full-range response
(42Hz - 20kHz)

R

15
kHZ

U
48 VDC

Phase corrected to 15 kHz

Magnetically shielded

48 VDC powered

Superior
engineering
for the art
and science
of sound.

Meyer
Sound

The Meyer Sound HM-1 is a
very compact, full-range selfpowered loudspeaker system
designed to serve in a wide
variety of installed sound
reinforcement and reproduction applications.
The HM-1 incorporates
significant design innovations
that afford unprecedented
performance with practical
advantages. In contrast to
conventional small speaker
systems, the cabinet venting is
tuned at 40 Hz to provide flat,
full-range response with halfspace loading. The concentric
tweeter mounting structure is
optimized to minimize both
back-wave interference and IM
distortion. A constantdirectivity high-frequency horn
affords a 100° beam width, and
sophisticated phase-correction
circuitry assures true pointsource performance without
the off-axis cancellation effects
that plague customary dualconcentric designs.
By implementing distributed
amplification, the HM-1 affords
substantial advantages in
reliability and ease of
installation when compared
with constant-voltage (70 V)
distributed systems. The HM-1
accepts a unipolar 48 VDC
power source which may be
supplied using twisted-pair
wiring jacketed with the signal
source conductors, eliminating
the need for wiring conduits
and greatly reducing induced
noise. Its amplifier and signalprocessing circuits are
designed to tolerate supply
voltage drops of up to 15%,
accommodating light-gauge

PATENT PENDING

cables and long cable runs.
Internal energy storage circuits
minimize the system’s peak-toaverage supply current
demands, allowing efficient
use of switched-mode
regulated supplies.
The HM-1 is a two-way
system comprising a 7”
graphite cone low-frequency
driver, and a concentricallymounted 1" soft-dome high
frequency driver with constantdirectivity horn, in a vented
cabinet. Integral bi-amplifiers
affording 400 Watts total
power output are built into the
enclosure, along with an active
crossover, driver protection
voltage limiters, and frequency
and phase response alignment
circuitry. A laser-trimmed
differential input stage affords
superior common-mode

rejection to accommodate
simple twisted-pair signal
distribution. Front-panel LEDs
indicate power, signal limit,
and thermal overload, and
a rear-panel circuit breaker
provides overall DC
power protection.
The magnetically shielded
HM-1 enclosure is coated with
a textured black or white
finish, and a variety of factoryinstalled mounting configurations may be ordered.
Optional accessories include a
remote switched-mode power
supply, a variable-speed
cooling fan assembly
controlled from an integral
rear-panel drive output, and an
auxiliary subwoofer that
provides flat response to 42 Hz
in free field and is powered by
the HM-1 low-frequency

HM-1 SPECIFICATIONS
Acoustic al

Frequency Range
Free Field
Half-space
Free Field with Subwoofer
Phase Response
Maximum SPL
Off-axis Amplitude Response
Crossover
Signal to Noise Ratio
2

1

(each loudspeaker)

3

4

5

6

Meyer Sound Laboratories

2

42 Hz - 20 kH
±2.5 dB 100 Hz – 20 kHz; –6 dB 42 Hz – 100 Hz
±2.5 dB 90 Hz – 20 kHz; –3 dB 42 Hz – 90 Hz
±2.5 dB 42 Hz – 20 kHz
±20° 250 Hz – 15 kHz
Without Sub: 116 dB SPL; With Sub: 120 dB SPL
±3.5 dB 100 Hz – 20 kHz up to 45° coverage
Complex roll-off shape, ≈ 3 kHz equal acoustic amplitude
>100 dB (A-weighted noise floor to max SPL)

has devoted itself to
designing, manufacturing,
and refining components

7

that deliver superb sonic
reproduction. Every part of

Cover age

(-6 dB points)

Transducers

Low Frequency
High Frequency
Subwoofer (optional)

Dual-Concentric
Drivers (magnetically
shielded)

Connector
Type
Impedance
XLR Wiring
RF Filter

Audio Input

Common Mode Rejection Ratio
Type
Output Power
THD, IM, TIM

A m pl i f i e r s

100° H; 100° V

every component is

7” graphite cone driver
1” soft-dome tweeter
10” cone driver (not shielded)

designed and built to
exacting specifications
and undergoes rigorous,

Options are 1 female XLR or a pluggable terminal strip
Differential balanced input circuit
10 kΩ differential (between pins 2 and 3)
Pin 1: chassis; Pin 2: + signal; Pin 3: – signal
Common Mode: 425 kHz low-pass; Differential Mode:
142 kHz low-pass
>80 dB (50 Hz – 1 kHz); typically 90 dB
8

comprehensive testing
in the laboratories.

Research remains an
Complementary MOSFET output stages class A/B, bridged
400 Watts RMS, 200 Watts/channel at 4 Ω (with subwoofer)
<.02 %

integral, driving force
behind all production.

Voltage
Current

AC-Power

9

Dimensions

Physical

Weight
Protective Grill
Enclosure/Finish

Nominal: 48 VDC; Maximum: 52 VDC; Minimum: 35 VDC;
Typical: 2.0 Arms, 3.5 Apk; Maximum in limiting:
3.0 Arms, 5.0 Apk

quality that is predictable

Height: 11.0”; Width: 8.4”; Depth: 9.7”, 10.5” with
fan attachment
11.0 lb (5.0 kg); shipping: 13.5 lb (6.1 kg)
Removable perforated steel grill causes < 0.5 dB
response variation
All birch plywood/black textured

1. Measurements are taken at 1 m on-axis, 1/3
octave, unless otherwise stated.
2. Amplitude tolerance depends on loading
conditions and whether the subwoofer is used.
3. Flush-mounted into single boundary surface.
4. Subwoofer adds approximately 8 dB
42 – 100 Hz.
5. Phase variation from pure delay and minimum
phase removed.
6. Pink noise or music.

Notes

Meyer strives for sound

and neutral over an
extended lifetime and
across an extended range.

7. A gradual amplitude attenuation occurs as the
angle increases beyond 45°. Greater attenuation
occurs at 2 kHz and beyond 10 kHz. There are
no response peaks.
8. Capacitively coupled; accepts up to ±50 VDC
common mode.
9. Idle current @ 0.4 A; using the slaved
subwoofer increases stated currents by @ 20%.

PHYSICAL DIMENSIONS
ALL UNITS IN INCHES
Made by Meyer Sound, Berkeley, CA, USA
European Office:
Meyer Sound Europe
Dalston House
39-49 Hastings Street
Luton Bedfordshire
England, LU1 5BE

0.6

0.7

®

UL

8.4

8.4

8.4

LISTED
3K59 C ®
COMMERCIAL
AUDIO SYSTEM

UL

HM-1 - 04.039.002.01B
1.5

Rear Panel
11.0

8.4
6.75

9.3

12.3

Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
tel: 510.486.1166
fax: 510.486.8356
e-mail: techsupport@meyersound.com
http: www.meyersound.com

17.5

Front

Side

Top
OPTIONAL HM-1 SUBWOOFER

© 1998 Meyer Sound Laboratories, Inc.
All rights reserved



---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.4
Linearized                      : Yes
Encryption                      : Standard V2.3 (128-bit)
User Access                     : Print, Copy, Extract, Print high-res
Create Date                     : 1999:03:08 10:43:14Z
Subject                         : hm1.pmd
Modify Date                     : 2005:02:17 13:27:25-08:00
Page Count                      : 2
Creation Date                   : 1999:03:08 10:43:14Z
Producer                        : Acrobat Distiller 3.0 for Power Macintosh
Keywords                        : 
Author                          : Karen
Mod Date                        : 2005:02:17 13:27:25-08:00
Metadata Date                   : 2005:02:17 13:27:25-08:00
Description                     : hm1.pmd
Title                           : hm1.pmd
Creator                         : Karen

EXIF Metadata provided by EXIF.tools