Sennheiser SER 1-3 User Manual download pdf (Page 61)

Hi -F Electret

Headphones

Ai_i

unipolar

2000

. unipolar

2002

unipolar

unipolar

2000

Frequency range:

16

to 20,000 Hz.

Open electrostatic transducer

principle.

Suitable for connection to all stereo

sound

sources with loudspeaker output.

Control box

for

two unipolar

headphones with

optical overmodulation

indicator.

The reputation

for

superiority,

for

use by the

professionals,

is

attached

historically to both

condenser microphones and to electrostatic

head-

phones.

Sennheiser endeavoured

to ensure that

its first electrostatic

headphones

operated the

open transducer

principle.

In addition

the high

voltage

powerpack

required for previous electro-

static headphones

was

to be avoided. Sennheiser

has resolved both

of these problems

with the

unipolar 2000

hi -fi

electret

headphones,

the

first

open electret

headphone in the world. After

thorough testing it was given the

following

assessment by the chief editor of the

magazine

"Hi -Fi

Stereophonie",

Karl Breh:

"As no

other

predecessor, this headphone

generates a sound quality which can be

described

as ample,

spacious,

transparent and

volatile while nevertheless remaining well -

defined and completely natural.

Naturally

a

decisive role in the overall quality of this head-

phone is

played by

the large -area diaphragms.

The first -class workmanship

is another note-

worthy

feature."

unipolar

2002

Frequency range: 16

to

22,000

Hz.

Electrostatic

two -way principle.

Suitable for connection to all stereo sound

sources with loudspeaker output.

Control box for two unipolar headphones with

visual overmodulation indicator.

By contrast with the unipolar 2000, the 2002 is an

electrostatic

headphone

which is

enclosed about

the

ear and open to

the

back. For the

first

time

in

a

headphone,

the construction is based

on

an

electrostatic two -way system without

switching

network. The

concentric

layout

of these two

systems

in

one plane ensures avoidance

of

the

otherwise unavoidable distortion

attributable to

propagation time

and enhances the overall

volume.

In this mode

of construction

the

diaphragm surface

consists

of

two

parts, the

inner

surface radiating

the medium

and

high frequencies

through

the

rigidity

of the air

"padding"

of 0.5

mm.

The outer,

annular diaphragm radiates the low frequencies.

The

smooth transition between

these two systems

sensure total avoidance

of undesirable response

irregularities.

The two electrostatic transducer systems

in the

unipolar

2000, with

their

extremely small oscillating

masses, convey undistorted

reproduction

of even

the

finest

sound structures.

It is worth mentioning

that

the highest frequency transmitted by the

unipolar 2000

is

already

well

outside

the human

listening range.

The HER 2000 control box

required for the unipolar

is supplied in the "set"

version with

standard

loudspeaker jacks and in the "set X" version

with

spade connector

lugs.

Two unipolar electret

headphones can be

connected

to the HER 2000 control

box, the

facility

for

the

volume

of one

headphone to be

reduced by 6 or

12 dB

is

by pushbutton control.

The

maximum permissible

level is indicated by one

LED per channel.

Additionally a switch

is

provided

in

the control box

for

optional

headphone

/loud-

speaker operation. The

maximum

switching

current

is

5

Amps, i. e. 100 Watts to

4

Ohms.

Relevant technical data

for unipolar 2000 and

2002 will be found in the Summary on

pages

80 to 81.

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