ISO-MAX®
PRO
SERIES
USER
GUIDE
SPEAKER-LEVEL
Models
Jensen
ISO-MAX8 Pro
They
use the
recording studios, broadcast facilities, and sound reinforcement
bandwidth,
same
an
series
audio interfaces are designed for use
industry-benchmark
vanishingly low harmonic and
Jensen
SC-2NR,
transformers that are installed in tens of thousands of the world's best
phase
to
LINE-LEVEL
SS-2NR
distortion.
Interfaces
and
SP-2SX
in
the finest professional and audiophile sound systems.
venues
because
of their
sonic
transparency, ultra-wide
Model
SP-2SX
Models
SC-2NR
isolators - the
(shown above)
selectable ranges,
output
of
W,
or
1,500 W respectively
covering large
outputs
are actively driven and cannot be grounded (these are often referred to
The
speaker
W,
1.5
W, and
remove ultra-sonic switching artifacts from the outputs
subtle distortions in downstream amplifiers [Deane Jensen
85th Convention Preprint 2725,1988}.
The standard versions
The
SC-2NR
power
amplifier
audio
systems
outputs
will
nominal
"Mono"
the
two
speaker
output,
L + R,
and
SS-2NR
SS-2NR
is
the functional equivalent
speaker
power amplifiers rated
areas.
inputs represent a trivial additional load for the driving power amplifiers - maximum input power
5.4 W
and
SS-2NR
with
where the nominal
reach 6.9 Vrms (+19 dBu), a level that represents
or
"reference level"
output versions, denoted
input
drives a single
are two channel
having an extended low-frequency response for extremely high-performance sub-woofers. The
drive voltages
at
24 W,
into
4 O
loads. Input
Since
the
speaker
respectively in the four input ranges.
have
dual,
or
"stereo," outputs that correspond independently to
output
signals
an
unbalanced input to
or
signal
is
by a
signals.
These
would
sub-woofer.
"speaker"
with
of
14 Vrms,
75
W, 240 W,
inputs are ungrounded, they are especially useful
will
reach 1.75 Vrms (+5 dBV)
full
"reference level"
standardized at
"-M"
suffix in the model number,
be
used, for example, when the inputs are Left and
level to unbalanced "consumer" level converters and ground
balanced "pro"level outputs. All are designed to accept, in four switch-
25
Vrms, 44 Vrms,
or
750 W respectively
ranges
also
include
In
addition, all models provide inherent low-pass
of
"digital"
and
output power.
signal
is
standardized
15 dB of
+4
dBu
or
SP-2SX
or
77 Vrms.
25 V
and 70 V lines
or
"class
D"
Gary Sokolich, "Spectral Contamination Measurement," AES
at
maximum rated input - sufficient to drive any known
This
level represents
at -
"headroom"
1.23 Vrms.
have a single
These
voltages
into
8 Q
loads
or
used
in
with
as
"bridge-mode"
power amplifiers.
each
15 dB of
10 dBV
or
0.316 Vrms. Likewise, the
in
professional audio
output that represents the sum
will
be
developed at
rated at 48 W, 150 W, 480
commercial sound
power amplifiers where both
or
"floating" outputs).
is
0.08 W,
filtering
These
artifacts can
of the
speaker
"headroom"
Right
channels and the
input
in
consumer
systems
full
systems
0.4
to
cause
signals.
SP-2SX
where the
of
These
ISO-MAX
units are entirely
FOR
OPTIMUM
PERFORMANCE,
passive
and require
no
power supply.
PLEASE
REVIEW
THE
FOLLOWING
PAGES!
General
Load
Impedance
Application
Range
Guidelines
(input
impedance
of device the unit drives) 10 kO or more
Maximum
Maximum
System
In choosing a physical location for the
cables.
"speaker
gauge
the
can be connected to either the main-channel power amplifier output terminals or the main-channel
whichever is
across
each
FortheSC-2NRor
Observing polarity, securely attach the
channel and screw terminals 8 (+) and 9 (-), marked "CH 2 IN," for the other channel.
SPEAKER
connect a standard, high-quality RCA male to RCA male
power
Output
Input
Cable
Length,
Cable
(amplifier/speaker to
SC-2NR
and
SS-2NR
ISO-MAX)
60 feet (18 m) of typical
SP-2SX
3 feet (1 m) of typical
Length unlimited
cable
at 50 pF/ft (160 pF/m)
total
capacitive load <
cable
at 50 pF/ft (160 pF/m)
total
capacitive load < 200 pF
Hookup
ISO-MAX
In general, the better location
wire"
is recommended for the
are generally
quality of sound - normal technical concerns about
the "constant voltage" distribution line. Again, be sure to observe polarity and tightly twist the strands of wire at
end to avoid strands that "stray" beyond the clamp
INPUT
amplifier(s) to be driven.
easiest
closer
or more convenient. For 25 V or 70 V distribution systems, make the
SS-2NR:
CABLES
to strip and handle. It should be emphasized that the quality of this wire has negligible effect on
ARE
CONNECTED
will
speaker
speaker
unit,
shorter output
be near the amplifier(s) to be driven. Inexpensive,
inputs to the
speaker
area
input
cables
to screw terminals 1 (+) and 2 (-), marked "CH 1 IN," for one
TO THE
CORRECT
TERMINALS - OTHERWISE,
cable
cables
are preferred over shorter input
unit.
Its
gauge
is technically unimportant but 18, 20, or 22
cables
do not apply. The other
"speaker"
of either the screw terminals or amplifier/speaker terminals.
DOUBLE
THE
between the
ISO-MAX
unit outputs and the inputs of the
small-gauge
ends
connections directly
CHECK
UNIT
MAY BE
"zip cord" or
of these input
speaker
TO BE
DAMAGED!
3,000
(speaker
cables
terminals,
SURE
THE
pF
feed)
Finally,
FortheSP-2SX:
Observing polarity, securely attach
"2-pole"
ISO-MAX
described below.
The Screw
If
parallel the input and output connectors, if present. Note that terminal numbers
cable
connector (not supplied).
unit
will
not accept 4-pole
Terminal
desired, all input and output connections can be made via the detachable 13-pole screw-terminal strip.
Terminal
13
12 CH 2, OUT -
11
10 CH 2, IN S
9
8 CH 2, IN +
CH 2, OUT +
CH 2,
CH 2, IN -
Strip
Marking
OUTS
each
speaker
Please
cable
feed
note that the mating Neutrik model
connectors. Alternatively, the screw terminals may be
(all models):
Function
Channel
Channel
Channel
(no internal connection)
Channel
Channel
2,
Line
Output +
2,
Line
Output - (cable shield for unbalanced output models)
2, Output
2,
Speaker
2,
Speaker
cable
to terminals 1 (+) and 2 (-) of a Neutrik
Shield
(internally tied to unit
Input
-
Input
+
NL2MP
descend
housing/chassis)
panel connector
used
in
left-to-right
"Speakon"
for
order.
model
used
speaker
These
NL2FC
on the
input as
connections
7
6
5
(CHASSIS)
CH 1, OUT +
CH 1, OUT -
Unit
Channel
Channel
housing, internally tied to Output
1,
Line
Output +
1,
Line
Output - (cable shield for unbalanced output models)
Shields
(see "Grounding"
discussion
below)
4
CH
1,
OUTS
Channel
1, Output
Shield
(internally tied
to
unit
housing/chassis)
3
2 CH
1 CH
CH
1, IN
1, IN -
1,
IN
S
+
(no internal connection)
Channel
Channel
1,
Speaker
1,
Speaker
Input
Input
+
Grounding
Although these units completely electrically isolate inputs from outputs, there
may
be
necessary.
prong).
CAUTION:
off3'd prong)
extremely dangerous practice, promoted
For balanced output models
normally
2NR), allowing ground current to flow
ground
green, length
is a convenient "ground" terminal
somewhere on the equipment's metal
equipment
between equipment and
destination equipment from 2-prong to 3-prong, attaching the green wire of the new cord
occurs
is
recommended.
This
generally
if
any piece
to
defeat safety grounding provided
through the
as
required) between screw-strip terminal 7 and the
in a
properly-grounded equipment
rack
happens
of
equipment in your system uses a 3-to-2 prong "adapter"
(SP-2SX),
XLR
output
This
can
be
on
rail). Another alternative
only when equipment
by the
grounding to the
cable
in
the output
most effectively done
the equipment for the purpose.
chassis.
by its
technically naive, that may result in fire, severe shock
shield connections. However, for unbalanced output models
RCA
Sometimes grounding
rack
(taking
has a
2-prong
3-prong power cord, we strongly urge
DESTINATION
cables
by
care
is
to
have a reputable technician
(equipment driven
would create hum
connecting
chassis
If
can be
to remove paint that might prevent electrical contact
are
situations where supplemental grounding
AC
power connection (no
or
buzz.
an
insulated wire (stranded #18 or #20 AWG,
of
the destination equipment. Sometimes there
not, you
done
can
attach the wire under
by
simply mounting the destination
change
third
or
other means (such
you to
remove
or
electrocution.
by
the unit's line outputs)
Therefore,
to
the equipment
an
added equipment
the power cord
or
grounding
as a
clipped-
it...
this
is an
(SC-2NR or SS-
an
existing
screw
on the
chassis.
If
the
SOURCE
(Ch 2),
Setting
On the bottom
input,
in
the
specified maximum output voltage
+19 dBu for the
750/1,500 W setting for
Channel 1 and switches
S4 and
be
damaged
improper settings.
equipment (amplifiers that generate the s speaker
as
shown below, to eliminate hum
the
Switches
of
the
unit,
you'll find a group
terms
of
rated maximum amplifier power output that
SP-2SX). Use
S1/S6
off off off
on
on on
on on on 750
S5 are
normally
by
continuous input voltages
the 75/150 W setting for
70 V
distribution lines.
6,
7,and 8 are for
Switch
Settings,
off.
They
S2/S7
off
are
used
or
buzz
of
(+5 dBV
Channel
Ch 1 / Ch 2
to
solve
up
to 80 volts,
that might occur.
switches that
for the
SC-2NR
25 V
distribution and the
Switches
2:
possible
1,
2,
S3/S8
off
grounding
regardless
input)
is
select
the rated
will
produce
and
SS-2NR or
and 3 are for
off
issues
of
switch settings,
ungrounded,
at 8 ohms
(see
"Grounding" above). While the unit can't
turn
on
switches
S4 (Ch 1)
JBBH1
H
o|
1 -
Amplifier
24 48
75 150
240 480
severe
Power
Rating
(W)
at 4 ohms
1,500
distortion may result from
and
S5
All
Jensen
products are proudly made
products, contact techsupport@iensen-transformers.com
5 PM,
Pacific
time.
For
detailed specifications,
ISO-MAX®
is a
registered trademark of
in
the United
Jensen
States
please
see
Transformers,
of America.
or
call
the product data
Inc.
If
us at
(818) 374-5857, Monday through
you
sheets
have
problems
at
or
questions about these
Thursday, 9 AM
www.iensen-transformers.com.
to
ISO-MAX®
PRODUCT
WARRANTY
For a period of 1
MAX®
product that fails due to defective materials or workmanship. For a period of 20
Transformers, Inc.
in
an ISO-MAX® product that fails due to defective materials or workmanship.
Both limited warranties are subject to the following limitations:
1)
Defects
misapplication, faulty installation, unauthorized repair, modification, or
2) In the
and the records of
3)
There
4)
JENSEN
THE USE OF
is limited to 12 months. If a problem develops
attempting
returned
instructions from us.
Limitations
The information provided by
responsibility is
is granted by implication or otherwise under any patent or patent right of
YEAR
after purchase,
will,
free of charge, repair or replace any
that are, in the
absence
are no
of proof of date of purchase, the date of manufacture (as determined from lot numbers of internal parts
express
TRANSFORMERS,
THIS
any repair. We can help you identify
to us for repair or replacement. In any
of
assumed
sole
Jensen
Transformers, Inc.)
warranties except as listed above.
INC.
PRODUCT
Jensen
Liability
Jensen
by
Jensen
Jensen
judgement of
SHALL
NOT BE
OR
ARISING
cannot be responsible for
for its use nor for any infringements of patents which may result from its use. No
OUT OF THE
about its products been
Transformers, Inc.
Jensen
Jensen,
the result of accident, misuse,
shall
be
used
LIABLE
FOR
INCIDENTAL
BREACH
with
this product during the warranty period,
specific
case,
problems, and
DO NOT
damage
checked
will,
free of charge, repair or replace any part of an ISO-
OEM transformer or any
in its place.
OR
OF
THIS
WARRANTY.
RETURN
due to shipping or improper
and is believed to be accurate; however, no
Jensen
YEARS
abuse,
acts
of God
will
CONSEQUENTIAL
Duration of implied warranties, if any,
possibly
THE
solve
the problem, before the unit is
UNIT
WITHOUT
Transformers, Inc.
after purchase,
Jensen
transformer contained
neglect, mishandling,
not be covered by this warranty.
DAMAGES
call
or write us before
AUTHORIZATION
packaging.
Jensen
RESULTING
and
FROM
license
JENSEN
DEVICES
PRODUCTS
OR
SYSTEMS,
ARE NOT
OR IN ANY
AUTHORIZED
APPLICATION
FOR USE AS
WHERE
CRITICAL
THEIR
FAILURE
COMPONENTS
COULD
IN
LIFE
CAUSE
DEATH.
Jensen
reserves
representation or guarantee regarding the suitability of any of its products for any particular purpose, nor
assume
any liability arising out of the application or use of any product or circuit, and specifically
liability,
including without limitation consequential or incidental
the right to make
changes
without further notice to any of its products.
damages.
Jensen
Transformers, Inc.
9304 Deering
Chatsworth, CA 91311
United
States
Tel: (818) 374-5857
Fax: (818) 374-5856
www.jensen-transformers.com
Avenue
of America
Jensen
makes
no warranty,
disclaims
Version 1.2, 30 Oct 2013
SUPPORT
INJURY
does
Jensen
any and all
OR
Loading...