Fisher STE 1200 Brochure

Page 2

i g the music Signal Yet Only a metal

Cone

a I V lot 20 22 (comparable to that of

d .To ensure r1ch faithful sound reproa I a paper cone) but alas guarantees

. Iduction the d1aphragm of each
3}; speaker has to be not Only strong but .
{"iralso responswe to all the subtleties of

' V'durabihty while dehvermg the ideal
' 1 .level of piston actlon QOOHZ '

I Cross»Sect10nal Diagram of a Porous Metal

7 ° 7 diaphragm can ensure both durability 13."

1 IA and excellent transrent charactenstics i}

. 7p1ston action With power to spare
4.. and flat frequency response And
» {only the porous metal structure
'gi-{;'_ developed for the d1aphragms of the
~ Fisher STE 1200 can deliver all of

f. theSe Without glvmg way to d1stort10n .
' 17:01? a metalhc sound .

i, -_ {To ensure extra power in the bass
' (range, where it is needed most Fisher
. also employs its umque perous metal ' '
" m 119 woofer cone The 3-d1mens1onal
' air-filled framework called porous '
ifgmetal is created by. a precass in
. gwhich nickel an extremely stable
. gmetal is foamed into the (issued
r g, «- shape This porous layer 18 sealed f . _
;-..?_, igthh a 20 {1 layer cf- alumlnum fail that f .
displays outstanding strength and
; excellent tranment characteristics
g ijtjfiThe result Of this layered cone "
:1 structure is a WOofer that not only
~~ ensures low distortion and a Q value

'i i f I Diaphragm Performance According to H

Material
1C0 -
T layer porous metal
0
E Pulp
I:
EL 0 Pulp
.5: 10 - O
.C Pulp
a;
C
I?
:2 OLOIOPU'IL O .utlI umiun m
-�� 0 Ca bun no r
: O
0.}
cc
1 l-
l I 1 1
0 0.02 1.21 '34 0,06 0.06
Surface density (gscmzl

Special adhesive

Aluminum shoot

Porous metal
./

Woofer

. I Cross-Sectional Diagragm of the STE 1200

Rublmr gasket

Dust cap

Porous metal conc-

Llret hane edge

Damper -\\:ivrlu-

Screw :T?
Voice coil 1-" l
Magnet 1- l: a

l

[ l "g
_._|

Tomiinal

/ 71- Plate

\ - \CQj} ' Bottom plate

Dust filter

4 Aluminum foil
Embroidery thread

Aluminum din
frame

-cast

, Pulp cone

I Laser Holograph Analysrs of Speaker
I " ,Performance ~

BOOHZ

1 Mum-Layered Met]; ~

Midrange

The midrange speakers of the STE
1200 employ a multlalayered dome
structure composed of" ,
aluminum has "
to ensure strata

frequency range The dam type
design was selected because of. its

A N excellent d1rect1onal characterrstics . _
and the rich natural sound it delivers.
Th midrange also incorporates a

coped~out magnenc anoint to

[substantially cut magnetic distortion

and dramatically Increase the level of
" fig-sound clarity - - ~ - -

I, I Cross-Sectional Dlagram of Mrdrange

Diaphragm

Alumina (20/1 )
Aluminum ( Ill/.1 )
Alumina (20/! )

A

llllll

llppur pinto

Dilluscr --

Lliu pliruum

\oitzt- cull

Magnet 7-.

Bottom plate

Protective net

Ftlgu ,

Rubber gasket

l

4' .-
1
1 .
.l ..
,1,"
. I. .l
./ 'n .
y ,, . ._ 5,3, I. \
/ X ' '3 \
1/ , .r A: ,.. 1
.-. _ . n v .r
I ' ' ' v ' 1-. "
. ,_ u . 1
. . _ _, h .
L 4
g 1

Dust cover *'

.. i Spemhcations According to Diaphragm Material

Density Sound Young Standard Material
_ _ transmission rate bending. cost
g .g g speed C E ,1, strength ratio
A (gycmzy. '(mfisem (kgmnr) -.(c,-"p)'
~Okidiz'ed " . ' ' :
aluminum . 2.48 6700 .. . 12.08!) g 2.7 l
(Alumina) ' ~ '.
: Aluminum 2.65 5150 7.028 1.9. , 1va
Magnesium 71.74' I - 4.800 4000 12;? 10
j Titanium 4.54 4800 . 11315201 1.1 28
Beruium 1.82 ' 1490]. U W 12.700 in " ' - Jae}

:..Metal ng Free-Edge
" IWeeter ' '

The diaphragm of the STE 1200 tweeter
forms a ring which is indented 111 av v

' shape with edges on both sides.

These edges have long slits in them to

Create an effect similar to having 4

supporting points around both the
inner and outer edges This design
cuts diaphragm weight and minimizes
the distance between the edge and

. the driving point of the voice coil.

thereby ensuring plenty of piston
action without partial vibration. The
free-edge structure raises amplitude
linearity while lowering the resonance

frequency and ensuring smooth
takeover from the midrange.

I Cross-Sectional Diagram of the Nectar

F mall r
Diaphram
Protect m.- net
Spacer , - -Rnbber gasket
insulating ring a
\
U j V
Terminal l / r; "l -Framc
/" 131. 3 -~- Magus!
L'pper plate ._ .; Account: absnrhenl
/
/

Bottom plate

Phase control for Coherent
4 Sound '

In order to eliminate phase
differences between the different
frequency ranges and ensure smooth
phase characteristics, the STE 1200
incorporates a phase- adjustment
circuit in its crossover network and

also cutsoff speakerreproduction g . a

at the" steep slopeof WZOdB/OCT.»

I outside its specified frequency range.
Each speaker unit also employs

a 3- dimensional layout for general . _g
phase control, thereby lowering time-
lapse distortion between frequency

ranges. The result Of this 3-way
' li-gg~C31hpaign agamSt phase distortion is
' the clear, natural audio reproduction I

we call coherent sound?

I Woofer. Crosswer Network~ Circuitry . '

" '1
I l
I ' I III
' l
' I
2.0mH : :
O ' Z565 fir i O
I
l I
I I
' I
"" . . I - ,.
21,111: _ . 839 18.31117 I __ 22,112
-l |
' I
' I
: 3.8mH : 10:2
' I
C 4...: A O
I
I. ___________ _,

.Woofer crossover Network Performance.

(Iircuit ll \ \
\

5-30"
3 ------ (Ilrcuit I '\./-~ \
g \
3-30- _.._Circultl* ll+ lll
_4o..
1 l J 1 l l
50 100 200 500 1K 2K 5K

Frequency [ liz]

l30' "' / O
I
I

' I

7 / l -(Iircuit ll
: . I "- .
1 , -----v(.lt'(.tllll
i / I -v-L'.ircuit l- I] Ill

90* - '
.:. / I
Z

0

so 100 200 500 1K 2K 5K

Frequency. lel

110. 4 Floor-WPe Speaker

.. With Bass Reflex Benign and

Acoustical Damper

High density particle board 18 used fer
the cabinet exterior and is built up to
a thickness of 65mm near the Woofer
to ensure extra protection against
external vibration and excess
resonance. ~> . ,