Meyer Sound HM-1 - Manual

48

VDC

U

15

kHZ

cables and long cable runs.

Internal energy storage circuits

minimize the system’s peak-to-

average 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 concentrically-

mounted 1" soft-dome high

frequency driver with constant-

directivity 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

The Meyer Sound HM-1 is a

very compact, full-range self-

powered loudspeaker system

designed to serve in a wide

variety of installed sound

reinforcement and repro-

duction 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 half-

space loading. The concentric

tweeter mounting structure is

optimized to minimize both

back-wave interference and IM

distortion. A constant-

directivity high-frequency horn

affords a 100

°

beam width, and

sophisticated phase-correction

circuitry assures true point-

source performance without

the off-axis cancellation effects

that plague customary dual-

concentric 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 signal-

processing circuits are

designed to tolerate supply

voltage drops of up to 15%,

accommodating light-gauge

FEATURES

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 factory-

installed mounting config-

urations 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

Self-Powered Loudspeaker

HM-1

Bi-amplified

Integrated electronics

Dual-concentric drivers

Full-range response

(42Hz - 20kHz)

Phase corrected to 15 kHz

Magnetically shielded

48 VDC powered

R

PATENT PENDING

Meyer
Sound

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engineering
for the art
and science
of sound.