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INFRA - MXB
BAG END
S P E C I F I C A T I O N S
INFRASUB™ TECHNOLOGY
INFRA-M B
LOW FREQUENCY INTEGRATOR
MODULAR SOUND SYSTEMS, INC. ALGONQUIN, ILLINOIS
M
ADE IN U.S.A
B
ALANCED INPUT: PIN 1 SHIELD, PIN 2 +SIGNAL, PIN 3 -SIGNAL
OUTPUT: PIN 1 SHIELD, PIN 2 +SIGNAL, PIN 3 -SIGNAL
NBALANCED INPUT: JUMPER PINS 1 AND 3 SHIELD, PIN 2 +SIGNAL
U
O
UTPUT: PIN 1 SHIELD, PIN 2 +SIGNAL, PIN 3 NO CONNECTION
GENERAL SPECIFICATIONS
x
Input Connectors:
XLR female
Maximum Input Signal:
4.5 V (+16 dBu)
Output Connectors:
XLR male
Maximum Output Signal:
4.5 V (+16 dBm)
Balanced In/balanced out:
+6dB gain
Balanced in/unbalanced out
Unity gain
Unbalanced in/balanced out:
Unity gain
Unbalanced in/unbalanced out:
Unity gain
Output Impedance:
< 50 Ohms
Power-on Indication:
Green LED
Operating Input Voltage:
12 - 15 VDC
Operating Current Required:
200 mA
Input Voltage Connector:
Miniature DC 2.5 mm
Input Voltage Polarity:
Center pin +
INFRA
INTEGRATOR
INFRA SPECIFICATIONS HI PASS SPECIFICATIONS
INFRA GAIN
Maximum INFRA Gain:
THRESHOLD
DYNAMIC FILTER
RIGHT HI OUT LEFT HI OUT
Hi Pass Gain: Unity
10 dB
Hi Pass Filter Frequency
Maximum INFRA Attenuation:
10 dB
INFRA Cutoff Frequency
Programming:
Plug in resistors
INFRA Cutoff Frequency:
8 Hz to 40 Hz
Programming:
Plug in resistors
Factory Set Hi Pass Filter
Frequency:
- 3 dB @ 130 Hz/-6 dB @ 97 Hz
Hi Pass Filter Frequency Range:
50 Hz to 200 Hz
Factory default 18 Hz
Hi Pass Filter Slope:
INFRA Output Mode:
12 dB/octave
Sum in Stereo Mode
Hi Pass Circuit Noise:
Nominal Dynamic Filter
< -90 dBu (20 Hz to 20 kHz)
Threshold: 0 dBu Output
Hi Pass Dynamic Range:
Minimum Dynamic Filter
Threshold: -10 dBu Output
Maximum Dynamic Filter
Threshold: +10 dBu Output
Maximum Dynamic Filter
Reduction Capability at 18Hz:
30 dB
Dynamic Filter Threshold
Exceeded Indication:
Red LED
INFRA Circuit Noise:
< -90dBu (20 Hz to 20 kHz)
INFRA Dynamic Range:
> 105 dB (20 Hz to 20 kHz)
(bandwidth unweighted)
INFRA Output:
Use with Infrasub™ or INFRA™
type loudspeakers only.
> 105 dB (20 Hz to 20 kHz)
(bandwidth unweighted)
PHYSICAL SPECIFICATIONS
Enclosure:
Black powder coated steel
Enclosure Mounting:
1U EIA rack (1.75")
Dimensions:
1.75"h x 19"w x 5.25"d
5 cm x 49 cm x 14 cm
Weight:
5 lbs.
2.3 kg
Shipping Dimensions:
6" x 22" x 12"
16 cm x 59 cm x 31 cm
Shipping Weight:
7 lbs.
3.2 kg
INFRA SUM OUT
RIGHT IN LEFT IN
12 VDC
POWER
Applications:
Recording Studios
Film Post Production
Video Editing Suites
Mastering Labs
Theatrical Production
Cinema Reproduction
Home Theater Systems
Stadiums and Arenas
Concert Sound Reinforcement
Musical Instrument Systems
Description: The Bag End INFRA-
MXB system module is a two-channel loudspeaker controller designed
for stereo 2-way operation with a
mono sum INFRA low frequency output. The INFRA-MXB incorporates
the INFRA dual integrator, frequency dividing, and system protection
in an easily operated configuration
where the system parameters are
internally preset or available on
front panel rotary controls.
Use INFRA™ output with
Bag End Infra loudspeakers only.
BAG END Loudspeakers
1201 Armstrong Street
Algonquin, Illinois
60102 USA
Voice 847 658 8888
Fax 847 658 5008
www.bagend.com
BAG END Loudspeakers 1201 Armstrong Street Algonquin, Illinois 60102 USA Phone 847 658 8888 Fax 847 658 5008
INFRATM, CVR LimiterTMand BAG END®are trademarks of Modular Sound Systems, Inc.
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INFRA-MXB
General: Upon
detailed evaluation
and analysis of an
INFRA system, it is
clear that the fundamental impression of power and impact is greater
with an INFRA system when compared to conventional bass systems. This is true even when the
two systems will measure the exact
same calibrated dB sound pressure
level. We believe this is because an
INFRA system compacts the bass
energy into a tight packet aligned
with the upper range signal rather
than the typical time smears inherent in conventional bass systems.
Objectively, the INFRA system
exhibits superior phase response
and low group delay.
The front panel controls are uniformly calibrated in even dB increments with a 20 dB control range
and are flush mounted so that the
control settings are not accidentally
changed.
The INFRA-MXB operates on 12 Volt
DC which insures complete international compatibility and easily
allows custom portable and automotive applications.
The INFRA-MXB requires no connection to the output of the amplifier. To
set the Dynamic Filter protection
threshold, refer to the amplifiers input
sensitivity and adjust the front panel
control accordingly.
Dynamic Filter: The Dynamic Filter
circuit is a complimentar y technology to the INFRA. Set to the proper
threshold, it insures that unexpectedly large signals will not overload
the system resulting in possible
damage or audible distortion. This
allows high level operation close to
the maximum system capabilities
without fear of accidental overload.
The Dynamic Filter is not a band
limiter. It automatically reduces the
low frequency extension and leaves
the rest of the bass unaffected.
Hi Pass: The Infra-MXB includes a
stereo Hi pass section for each
channel. This section provides a
very low noise unity gain Hi pass
filter factory set to roll off at 12dB
per octave. The filter frequency is
factory set to -3dB at 130 Hertz.
This makes the -6dB point of 95
Hertz the standard factory set
crossover frequency. This setting
will be correct for most applications.
The frequency can be changed for
special application by changing
internal socketed resistors.
Polarity: The INFRA and Hi pass
polarity in the INFRA-MXB have
been internally set for proper cross over functions. A simple polarity
tester may show reversed polarity
as referenced to DC. In audio, we
listen to AC signals and the best
actual polarity determination is
made at the crossover point with
an asymmetrical signal. Under
these conditions, the INFRA-MXB
will exhibit the correct polarity at
crossover and provide the most
even blend between the upper
range system and the INFRA speakers. Reversing the INFRA polarity
will add energy in the upper bass
region near crossover and may
mask the lower bass output.
What is INFRASUB™ technology?
Infrasub is Bag End's second generation
dual integrator bass extension technology.
Utilizing Surface Mount Technology, the
Infrasub technology provides improvements over earlier dual integrators
through modern manufacturing. The
extended low frequency approach insures
that the lowest 3 octaves of the audio
and sensory spectrum are reproduced
acoustically in the same time and freq
uency relationship as the electrical input
to the system.
A fundamentally new approach to low frequency reproduction, the INFRA™ employs
electronic compensation to the uniform
response that a sealed box loudspeaker
system exhibits below its resonance frequency. The resultant frequency response
can be extended well below the audible
range while at the same time greatly
reducing the influence of the system resonance. An INFRA™ system reproduces
each note with precision and uniformity
while maintaining a flat frequency and
phase response, eliminating the tendency
to emphasize the notes around resonance
as in conventional bass systems. The
enhanced INFRA™ dual integrator provides both a very flat response below resonance and the high frequency roll-off
above resonance, for crossover to the
midrange driver, without the use of conventional low pass filters and the delay
typically introduced by them. An inherent
bonus of the process requires the enclosures to be small. For example, a double
10-inch INFRA™ system measures only
13" x 22" x 13" (1.5 ft
6 Hz 200 Hz
Electrical frequency response of the
INFRA™ dual integrator
Acoustical output of the INFRA™
system
Acoustical frequency response of the
INFRA™ loudspeaker in a sealed box
Impedance amplitude of INFRA™
loudspeaker in a sealed box
3
).
BAG END Loudspeakers 1201 Armstrong Street Algonquin, Illinois 60102 USA Phone 847 658 8888 Fax 847 658 5008
INFRATM, CVR LimiterTMand BAG END®are trademarks of Modular Sound Systems, Inc.
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INFRA-MXB
INFRA-MXB FILTER FREQUENCY PROGRAMMING
To change the INFRA cutoff frequency and the hi pass
frequency you may replace the indicated resistors. The
replaceable resistors are mounted in plug in sockets
and no soldering is required. Each resistor has a specific K factor number associated with it which is to be
divided by the filter frequency selected. The filter fre-
quency is specified as the -3dB point. This is the standard way of specifying filter frequencies but should not
be confused with the actual crossover frequency of the
loudspeaker system. (The actual crossover frequency is
at the -6dB point which may be calculated for the hi-pass
by multiplying the -3dB frequency by .75, and for the lowpass by multiplying by 1.33) The result of this calculation will equal the value of the resistor in K ohms.
MXB.PCB rear
For example:
The factory set value for the normal stereo Hi Pass sec-
tion is 130 Hz. R51 is part of the Hi Pass filter and has
a factor number of 11,250.
Simply divide the factor, 11250 by the frequency select-
ed, 130 and this equals the resistor value in K ohms,
86.5 K ohms or 11250/130 = 86.5.
Each filter has two sections with two resistors with differ-
ent K factor numbers. Both resistors must be calculated
correctly to achieve a proper filter frequency and slope.
The procedure is to divide the K factor by the desired
cutoff frequency in Hertz to find the resistor value in K
ohms, and choose the nearest standard value. For all
practical purposes, you can choose the nearest 5%
tolerance value and achieve very good results.
MXB.PCB FRONT
INFRA-Cutoff Frequency
For R55: divide 682 by frequency
Factory value is 18.5 Hertz / 36.5 K Ohms
(682 / 18.5 = 36.8)
For R56: divide 341 by frequency
Factory value is 18.5 Hertz / 18.2 K Ohms
(341 / 18.5 = 18.4)
Hi-Pass Frequency for Hi-Freq output Right Channel
For R53: divide 11250 by frequency
Factory value is 130 Hertz / 86.6 K Ohms
(11250 / 130 = 86.5)
For R54: divide 22500 by frequency
Factory value is 130 Hertz / 174 K Ohms
(22500 / 130 = 173)
BAG END Loudspeakers 1201 Armstrong Street Algonquin, Illinois 60102 USA Phone 847 658 8888 Fax 847 658 5008
INFRATM, CVR LimiterTMand BAG END®are trademarks of Modular Sound Systems, Inc.
Hi-Pass Frequency for Hi-Freq output Left Channel
For R52: divide 22500 by frequency
Factory value is 130 Hertz / 174 K Ohms
(22500 / 130 = 173)
For R51: divide 11250 by frequency
Factory value is 130 Hertz / 86.6 K Ohms
(11250 / 130 = 86.5)
Remove the surface mount resistors R10, R11, R17 & R18.
These are to the right of R51 and R53 as shown on above (rear).
Remove surface mount resistors R26 and R28, which are to the
right of R55 and R56, as shown on above (front).
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