Meyer Sound USM-P Series USM-P:INTRODUCTION AND TECHNICAL ADVANTAGES, AC POWER

Thank you for investing in the Meyer

Sound USM-P Series. The USM-100P and

USM-1P self-powered stage monitors are

composed of:

• one 15-inch cone driver and one 3-

inch diaphragm compression driver;

• phase-corrected, optimized control

electronics;

• a two-channel amplifier

(350Wrms/ch).

Compared to conventional monitor

designs, Meyer Sound’s USM-P Series

loudspeakers are uniquely capable of

producing flat phase and amplitude

response, full bandwidth reproduction

and a near-perfect impulse response.

The USM-P boasts a maximum output of

132dB peak SPL at 1 meter with excep-

tionally low distortion and a noteable

lack of coloration at all amplitude lev-

els. An additional benefit of the design

engineering and system packaging of

the USM-P is its improved linearity and

lower susceptibility to feedback.

USM-P Series systems excel in stage

monitoring applications that require

efficient response down to 30Hz for

clean, high level reproduction of bass

and drums. USM-P Series monitors can

be deployed as stage wedges or flown as

side-fill.

The USM-1P horn's narrow beamwidth

(45°H x 45°V) permits precise coverage

with minimal interaction between

neighboring monitors. The USM-100P

horn's wider pattern (100°H x 40°V)

provides broad coverage in either wedge

or flown applications.

DESIGN BENEFITS:

• The amplifier is optimized for the sys-

tem, providing substantial power

without endangering the drivers.

• The integrated design simplifies setup

and installation, eliminates amp

racks, and extends the durability and

reliability of the loudspeaker.

• The gain structure between the con-

trol electronics and amplifier is per-

fectly matched.

THE USM-P HORNS: CONSTANT-Q

Constant research and development

efforts at Meyer Sound have led to the

solution of the most difficult problems

associated with horn design. In order to

appreciate the significance of this work,

it is necessary to define an often misun-

derstood term: the beamwidth of a horn

is the angle at which the sound pressure

at a given frequency decreases to half

(-6dB) its on-axis amplitude. Specifying

beamwidth using the -6dB points has

been proposed as the audio industry

standard; Meyer Sound adheres to this

definition.

NOTE: Unfortunately, beamwidth is often

used to describe the angle at

which the sound pressure

decreases 10dB from its on-axis

amplitude because many listeners

perceive this as a decrease to

half the SPL. When reading a

beamwidth specification, it is

essential to determine whether it

refers to the -6 or -10dB points

because they indicate very differ-

ent results: the -10dB points

yield a wider angle.

Previous technologies produced horns

whose beamwidth varied over the oper-

ating frequency range. These horns also

displayed nonuniform frequency

response within, and significant side

lobe energy outside their beamwidth.

Both undesirable characteristics, partic-

ularly prevalent for horns with a wide

beamwidth, make array design extremely

problemactic.

The USM-P was developed in Meyer

Sound's anechoic chamber by measuring

coverage patterns using angular and fre-

quency resolutions of 1° and 1/36

octave, respectively. The USM-P horns

exhibit Constant Q: the beamwidth

remains consistent across the horn's

operating frequency range in both the

vertical and horizontal planes.

Both horns share the following remark-

able attributes:

• uniform frequency response within

the beamwidth

• rapid and uniform amplitude attenua-

tion for all frequencies outside the

beamwidth

• minimal side lobes

USM-P:INTRODUCTION AND TECHNICAL ADVANTAGESAC POWER

The USM-P uses a PowerCon locking 3-

pole AC mains connector that prevents

inadvertent disconnection. The unit

must have the correct power cord for

the AC power in the area in which it will

be used.

When AC power is applied to the USM-P,

an Intelligent ACtmsupply automatically

selects the correct operating voltage,

allowing the USM-P to be used interna-

tionally without manually setting volt-

age switches. The Intelligent AC supply

performs the following protective func-

tions to compensate for hostile condi-

tions on the AC mains:

• suppresses high voltage transients up

to several kilovolts

• filters EMI (radio frequencies and

noise present on the AC line)

• sustains operation during low-voltage

periods, which minimizes audio dis-

continuity

• provides soft-start power-up, which

eliminates high inrush current

The USM-P can withstand continuous

voltages up to 264V and allows any

combination of voltage to GND (i.e.

Neutral-Hot-GND, Hot-Hot-GND).

Engagement

Separation