Janszen 65 owners manual

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INSTRUCTIONS BRIAN L. WALLEN

JansZen* Electrostatic Loudspeakers
Models 130 and 65

SPECIFICATIONS: Model I30 SPECIFICATIONS: Model 65
Push-pull electrostatic transducer comprising FOUR radiators and power Push-pull electrostatic transducer compfising TWO radiators and power
supply In cabinet. supply in cabinet.

Frequency response: 500 c/s to beyond 30,000 c/s. ,
Type of crossover network: LRC high-pass filter. Frequency response. 700 c/s to beyond 30,000 c/s.

Power cord input: I I7 v. 50-60 c/s AC-Z watts drain. TYPE 0 crossover network: LRC high-POSS "9"
Maximum input; 8 ohm: 20 volts RMS (50 watts). Power cord input: I 17 V. 50-60 c/s AC-2 watts drain.
. .16 ohm: 28 volts RMS (SOuwatts). Maximum input: 20 volts RMS (50 wattsl,
H|gh frequency disperSIon: M23: 38629? High frequency dispersion: 60".
Distortion: less than 0.5% total harmonic distortion at 50 watts input Di5'°"l°"5 L955 'h°" 05% total harmonic dl5'°"l°" 0' 50 mm input
below 10,000 c/s. below I0,000 c/s.
Impedance: 8 ohm or 16 ohm. Impedance: 8 ohms.

GENERAL LOUDSPEAKER CARE

Your JansZen loudspeaker has been manufactured to precision toler- No precautions other than those used with ordinary household elec-
ances by American craftsmen whose pursuit is highest quality rather than trical appliances need be observed with the electrostatic tweeter. Haw-
quantity. It is a high fidelity loudspeaker in the strictest sense of the ever, it should not be subjected to temperatures in excess of 120° F. for
word, and will import sound of nearly perfect naturalness when installed prolonged periods of time. If the grille cloth gets dusty, it can be cleaned
with auxiliary components of comparable quality. lts extremely smooth with a vacuum cleaner.
power response insures superb reproduction of transients, producing sound Transient peaks on music and speech from a 100 watt amplifier op-
af unrivaled purity, and reducing needle scratch and tape hiss_to nepr- emfing at maximum output will not result in damage to any part of the
inoudibility. ITS patented PUSh'PU constant charge deSig" PVOV'CIES h'Qh speaker. However, for those wishing to test the tweeter with an oscillator,

POWEV output, high efflCienCYi and extremely l°W distortion. sine wave input should be restricted to less than 7 volts across a 16 ohm
unit and 5 volts across an 8 ohm unit. The dissipation ratings of the high-
INSTALLATION pass filter network elements are more than adequate for speech and

The JansZen electrostatic tweeter should be placed so that it is music at high power, but prolonged application of high-voltage sine waves
directed toward the listening area at ear level. In general, the speaker at or near the crossover frequency or at frequencies above 5 kc may result
:hould be set on top of the wfiafer cabinet so as to minimize the distance in damage to these components.

etween radiating 0'9 0 i e woofer Ohd tweeter. "9 he power cord There is no problem of dust attraction to the electrostatic radiators.
1'0 I 19425 V~ 50'60 5/5 AC.|Ine,: the speaker can daft ON hdeh Usual dust particles, even if they do come in contact with the radiators,
"WEIY 1th? damage 0' deterioration. If dESI'Edz the lthCOId C0 be will not cause distortion. Small pieces of grit, however, can severely dis-
P'UQQEd "0 one Of the 5W"Ched outlets °h the Peampl'he 3" DOW tort the sound and reasonable precautions should be taken to prevent
amplifier, thereby turning the speaker on and off with the rest of the their entry.
system. . . .

THE JANSZEN ELECTROSTATIC LOUDSPEAKER SHOULD NEVER SLolélitois ever necessary to replace the fuse, USE ONLY A Va AMPERE
BE CONNECTED THROUGH A SERIES CHOKE, CAPACITOR OR RE- - '

SISTOR; AND NO SUCH ELEMENTS SHOULD BE CONNECTED ACROSS
THE JANSZEN'S INPUT TERMINALS, ALTHOUGH SERIES ELEMENTS
ARE PERMISSIBLE WHEN THEY ARE USED IN ROLL-OFF NETWORKS

FOR THE ASSOCIATED WOOFER. REPAIRS AND WARRANTY
BALANCING WOOFER WITH THE ELECTROSTATIC The JansZen electrostatic loudspeaker is warranted against defects in

. . . materials and performance for a period of ONE YEAR, provided the
wooflizlifearfcliefhliechsIt:Itchesrporld'pderbgufart"trip:dori"IthlzaugiItlI'pellifielr.h Fligirieieiifi: Warranty registration card is returned within one week from the date of

appropriate connections to be made when using combinations of the Jans- $Efiagsiénigjiflggnagr: electrostatic radiators are warranted for TWO

Zen electrostatic with the JansZen Models 250 or 350 woofers or other

recommended woofers. These connections will give approximate balance, ShQUld W Pariah °hY difficulty Whh YOW JansZen. speaker,
and the level control on the rear panel of the tweeter can then be used return 'f to the .dealer 5" whom " W05 PU'ChJSEd for checking t° be
for fine adjustment to compensate for room acoustics. sure the fault IS in the speaker. It IS suggested that the speaker be tested

It is suggested that either the Models 65 or I30 be used with a single "I a system _'" WhICh another JansZen system is functioning properly,
woofer, but that only the Model I30 be employed with two or more before returning for repair, since defective components in the rest of the
woofers. The reason for this is that a multiple woofer system is usually musnc Stem may wrongly 9' the Impression that lhe I°UdSPe°ke '5
selected to obtain a very broad sound source, and the Model I30 has fth-
wider high frequency dispersion than the Model 65. The NESHAMINY ELECTRONIC CORPORATION will not assume

If the wiring diagrams are followed, the recommended woofers will be any responsibility for repairs or charges made by unauthorized personnel,
properly phased with the tweeter. If other than these woofers are used, Removal of the electrostatic radiators voids the warranty, and the manu-
proper phasing in the acoustical crossover region is achieved by using facturer reserves the right to refuse repair of such units in which the
either inter-station noise from an FM tuner, or program material, revers- radiators have been removed for any reason. Individual radiators should
ing the input connections to either the woofer or tweeter (not both) to not be replaced or interchanged in the field, since these must be matched
select the smoothest overall sound. in each loudspeaker.

RECOMMENDATIONS FOR AUXILIARY COMPONENTS

If the performance characteristics inherent in JansZen loudspeakers AR>2, Bozak 5499A, KLH Models One, Two and Three, and Tannoy
are to be fully realized, they must be incorporated into a music system in l2/LF.

which the rest of the components are of extremely high quality. When any of these woofers is used, generally no. crossover network
other than the high-pass filter built into the electrostatic is necessary,

Low Frequency Speakers (woofers) since the response of these speakers normally falls off above IOOO-ZOOO
c/s as a result of their mechanical characteristics.

Since peaks in the response of woofers tend to mask the output of the When woofers are used which have a smooth response below I000 c/s
JansZen tweeters, only speakers with a smooth, uniform frequency range and a significantly high or peoky response above that frequency, a roll-
below 1000-2000 c/s should be used. The most satisfactory results will off network such as that shown in Figure 2 should be applied to the
be obtained when the tweeters are used in combination with either the woofer.

Models 250 or 350 JansZen woofers, since these drivers have been The use of multiple crossover networks is not desirable, because of

specifically designed for use with them, However, some other woofers con their degrading effect on transient response and the possibility of im-
be used, if desired. Typical of these are: Acoustic Research ARJW and pedance mismatching.

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Power Amplifiers

The power amplifier selected should have very low harmonic and in-
termodulation distortions, the frequency response should be very wide, and
it should exhibit high stability under loudspeaker load.

If the amplifier selected has a variable damping factor, this should
be set for maximum damping Laboratory tests have shown that a low
damping factor will degrade the sound of the JansZen electrostatic, and
extenswe listening tests have indicated that all of the recommended
woofers perform better with an amplifier having a high damping factor.

The power output required of the amplifier will depend on the desired
listening levels, size of the room, acoustic conditions, etc. In general, a
GOOD 20 watt amplifier can be used for many listening purposes, but any
ampliiier up to 100 watts can safely be used on integrated music material,

Preamplifier:
Low distortion and wide frequency range are just as important in pre
amplifier-control units as in power amplifiers. If the maximum allowable

intermodulation distortion of a power amplifier is l% (at rated output),
then the distortion of the complete preamplifier should be less than O.l %
at sufficient voltage to drive the amplifier to full output,

Pickup Cartridges

Law distortion and smooth frequency response in phonograph cart-
ridges ore very important, especially so with the advent of stereophonic
records, in which there are very complex groove forms. The cartridge
should have equally high compliance in both lateral and vertical planes
(at least for stereo), and have a resonance frequency (between the dyn-
argti: mass of the stylus assembly and the vinylite groove wall) above

c.

FIGURE 1. PROPER HOOKUP OF MODELS 65 AND 130 WITH RECOMMENDED WOOFERS.
Model Isousohm)_ Muss». more ohm) Mod-l I30(|6°hm]
G léohm G Rah-n G ohm
Ialohm tolbohm
o lbohm My." wtwt
-. 35$ MM," mm,"
output output
Mp ModalJSOJumlcnmhr Dual Model JEOJamZ-n woofers
Model 25o 1mm weeks! We 9 0" MOW 30 ° 55- (ulu: ,Efslfiilfifilllfimx
KTMLZSZTfiffizéS. °"' """tl'.':::;",l;9f:; m" ., rm, mm
Model 05 or I30 ohm) ModuleSor IJOVE ohm) Model lJOIIA ohm)
G Enhm G Hahn! lbohm
3 Ulllohm L J
o o W anoohm u v o g m
"33; £1511; "3:3" 3 {e- um
\ Bohm
+Vowmmon F. imp":
ta (ammo "9 to common
\- W. W.
'7""°"" a :1 nl, wear r
mam ($3,213,222in WioimL-ME'
from drum)
FIGURE 2. ROLL-OFF NETWORK FOR WOOFERS FOUND PEAKY ABOVE 1000 C/S.
qes
TO 1
POWER : 5 mt: TO 800 cls dropout
AMPUFIER WOOFER 5 dbl°fl°ve
z I. n c c 011 o! . .
an. 1.5m: 5n 25uf WP" 91mm. 3
16-0. 3.0m: 1m nur 1°! 12 dbloctovo

* .
JunSZen loudspeakers are manufactured excluswely by

NESHAMINY ELECTRONIC CORPORATION

N ESHAMINY, PENNSVLVANIA

" Incorporating designs by Arthur A. Jonszen.

l-2003- A