MX250 OWNER’S MANUAL
1
The MX250 Close-Coupled Electronic Processor™ (CCEP) is a two-channel,two-way electronic crossover designed for
use in both fixed installations and touring sound systems.It is factory-configured for use with specific EAW loudspeaker
systems.This ensures optimum system performance and relieves the end user from the burden of configuration.
This design continues EAW’s commitment to the primary importance of total system design in controlling a
loudspeaker’s ability to maximize its outputs within your application.
Features Overview
The MX250 CCEP™ incorporates a unique combination of features and design innovations that set it apart from conventional crossover
networks and permit its precise adjustment for a particular EAW speaker system.EAW Engineering completed all the guesswork that you would
normally perform with a conventional crossover in an attempt to attain the optimum parameters for each speaker system.
NON-COINCIDENT FILTERS
When necessary,the MX250 CCEP incorporates a non-coincident filter system.This means that the high-frequency and low-frequency filters
aren’t restricted to the same corner frequency—contributing to the system’s overall superior acoustic performance.The filter types for both
high frequencies and low frequencies are 24 dB-per-octave Linkwitz-Riley.Careful analysis of the MX250’s electrical performance and the loud-
speaker’s acoustical performance remain key elements in the close coupling of the crossover to a particular speaker system.The end result of
the close coupling process corrects acoustic response at the crossover frequency rather than depending on an “idealized”electrical response.
Optimum crossover frequencies and filter shapes for each speaker system configuration have been determined,and incorporated at the
factory as the MX250 CCEP’s presets.The label on the rear of the unit confirms the configuration.
Technical Description
OPERATIONAL SUMMARY
The MX250 CCEP functions as a stereo two-way crossover or as a stereo two-way crossover with additional summed monaural low and high
outputs.EAW presets the MX250 as part of the configuration process.Unlike most outboard crossover devices,we optimize this device for a
particular combination of EAW subwoofers and full-range speakers or for bi-amping specific EAW full-range systems.The configuration of
your unit is labeled on the back of the MX250 CCEP chassis.
The crossover filters use 4th order Linkwitz-Riley alignments,which yield a 24 dB per octave slope.By measuring the actual acoustical output
of the various combinations of EAW speakers,EAW’s Engineering department has calculated the optimal crossover frequencies for each
configuration.Your MX250 CCEP has been preset at the factory using separate high-pass and low-pass filter modules.The summed output
configuration is also preset at the factory.
If you wish to reconfigure your MX250 CCEP for a different speaker system contact the EAW Service Department at 800-992-5013
(508-234-6158),fax 508-234-3376.The MX250 CCEP is not intended to be modified in the field.
ENCLOSURE
The steel chassis of the MX250 CCEP is designed and built to withstand the abuse and jostling of portable and mobile applications while
ensuring reliable operation.The chassis is one rack-space tall (1.75 in.; 44.5 mm) and has a depth of 8.16 in. (207.3 mm).
The inputs and outputs are 3-pin XLR connectors on the rear panel of the chassis;two females for the inputs,and six males for the outputs.
AC POWER
The MX250 CCEP has a universal power supply compatible with virtually any AC power source throughout the world today.An internal switch
sets the power supply for either 95-130 VAC (50-60 Hz) or 190-260 VAC (50-60 Hz) operation.A label on the rear of the MX250 indicates the
factory voltage setting.
The AC power line cord attaches to the MX250 CCEP chassis via an IEC-230 connector on the rear panel.Check and insure the AC line cord
mains cable and voltage setting are correct for the power source.An incorrect voltage switch setting could cause severe damage to the unit.
2
The power switch on the front panel switches the AC on and off.No current flows when this switch is in the “off”position. A power LED on the
front panel confirms that the unit is correctly powered up.
C ONNECTING THE MX250 CCEP
Care should be taken to ensure that pin #3 of the MX250 input XLR is always connected.If connected to a balanced (differential) signal source,
pin #3 should be connected to the negative (i.e., inverting or “-”) signal line.If driven by an unbalanced (single-ended) source,pin #3 must be
tied to ground in order to avoid a significant loss in signal.The following diagram illustrates one example of how this is done.
INPUT SIGNAL CONNECTION
Input signal connections are through the female XLRs.The MX250’s inputs have actively-balanced differential amplifiers.Whenever possible,
use the inputs in a balanced configuration.This helps minimize hum and noise pickup from the input signal cables by maximizing the
common-mode rejection (canceling voltages common to both the + and - input terminals).
The input XLRs are wired as follows:
2+ non-inverting input
3- inverting input
1ground
All XLR connectors are wired pin 2 hot (positive).The input impedance of the MX250 CCEP is 20 kΩbalanced, 10 kΩor greater unbalanced.
OUTPUT SIGNAL CONNECTION
Output signal connections are through the male XLRs.The MX250 has actively-balanced differential output amplifiers.
The outputs are wired as follows:
2 signal +
3 signal -
1ground
INTERNAL SERVICING
There are no user-serviceable parts inside the MX250 CCEP.The filter modules,presets,trims,etc., should not be changed,adjusted,or modified
by anyone other than an EAW authorized service engineer.The settings within the unit are the results of careful testing and are not designed to
be modified in the field.Tampering with them will probably result in audibly inferior performance.It will also void your warranty.POTENTIALLY
LETHAL VOLTAGES ARE PRESENT INSIDE THE MX250,THEREFORE SERVICING SHOULD BE LEFT TO QUALIFIED TECHNICIANS.
-9
-12
0
-1 +1
-2 +2
-3 +3
+6
+9
+12
-6
-9
-12
0
-1 +1
-2 +2
-3 +3
+9
+12
-6
-9
-12
0
-1 +1
-2 +2
-3 +3
+6
+9
+12
0
-1 +1
-2 +2
-3 +3
-6 +6
-9 +9
-12 +12
Power
High
(High)
Mid
(None)
Low
(Low)
High
(High)
Mid
(None)
Low
(Low)
High
(High)
Mid
(None)
Low
(Low)
CX300
(MX250)
0
-1 +1
-2 +2
-3 +3
-6 +6
-9 +9
-12 +12
-6
-9
-12
0
-1 +1
-2 +2
-3 +3
+6
+9
+12
-6
-9
-12
0
-1 +1
-2 +2
-3 +3
+6
+9
+12
-6
-9
-12
0
-1 +1
-2 +2
-3 +3
+6
+9
+12
-6
-9
-12
0
-1 +1
-2 +2
-3 +3
+6
+9
+12
Right Outputs
(Right Outputs)
Left Outputs
(Left Outputs)
Center Outputs
(Right/Left Summed)
(-)(+)
2
3
1
Inputs
Left Right
Left Outputs Summed Outputs Right Outputs
Low High
Low High
One Main Street, Whitinsville, MA 01588
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Low High
120VAC
50-60Hz
12W
PUSH
PUSH
PUSH
PUSH
SIGNAL
GND
PIN #2
PIN #3
PIN #1
3
Practical Considerations
PHYSICAL
The case of the MX250 CCEP is fully enclosed to prevent the entry of foreign material and to shield the internal circuitry from most outside
electromagnetic fields.To prevent the circuitry’s picking up hum from inadequately shielded transformers, mount the MX250 CCEP at least two
inches from any power amplifier.Computer monitors,motorized devices,and some other gear may emit strong hum or electromagnetic fields
also, so exhibit care when mounting the MX250 CCEP near them.
Convection currents from power amplifiers and other such heat-producing equipment could cause the MX250 CCEP to run hotter than it
should,perhaps eventually causing premature failure of the electronic components and/or power supply.Make sure there is adequate
ventilation in the equipment rack – use fans if there is any concern.
ENVIRONMENTAL
As with all electronic equipment,avoid using the MX250 CCEP in damp or excessively humid conditions.In outdoor applications,protect the
unit from rain and precipitation or any other dampness.If some mishap causes the unit to get wet or damp,dry it out thoroughly before using
it again.
CLEANING
You can clean the exterior of the MX250 CCEP with a slightly damp cloth.Use a small amount of mild detergent or cleaning fluid if necessary.
Do not use petroleum spirits,thinners,or other solvent cleaners – they might seriously damage the finish.
SPECIFICATIONS:
Inputs Two;active balanced
Input Impedance > 20k Ohms
Max.Input Level +22dBu
Outputs Six;active balanced
Output Source Impedance 200 Ohms
Output Min.Load 600 Ohms
Output Max.Level +26dBu into 600 Ohm load
Frequency Resp. +/- 0.5dB 20Hz - 20kHz
Noise < -90dBu,20Hz - 20kHz unwtd
Dynamic Range 110dB
Total Harmonic Distortion < 0.003% 20Hz - 20kHz,0dBu
Gain +/- 12dB from unity setting
Gain at Unity Setting 0dB unbalanced out,6dB balanced out within passband
Input Connectors 3-pin female XLR
Output Connectors 3-pin male XLR
Power Connector 3 pin IEC
Power 95-130 VAC,190-260 VAC; 50-60Hz
Power Consumption < 15 watts
Net Weight 8.5 pounds (3.9kg)
Shipping Weight 10 pounds (4.5kg)
Dimensions 1.75 (1U) X 19.00 X 8.16 inches (44 X 483 X 207mm)
4
System Sensitivities
For the Direct Radiating Sub configuration a default gain adjustment of +5dB on the sub output is factory preset. For
the Horn Loaded Sub configuration a default gain adjustment of 0 dB is factory preset.Amplifier gains,environment,
and personal taste may require the further level adjustment. The following list of sensitivities is for EAW products com-
monly used with the MX250.Use this reference to fine tune your particular combination of sub and full range products.
This is easily done by removing the front panel of the MX250 and adjusting the gains to meet your needs.
Full Range
AS300e 98
CP621 101
DC5 97
DC6 95
DS122e 98
DS123e 97
DS153e 98
DS223e 99
FL103 95
FR129z 97
FR153z 97
FR159z 100
FR122e 98
FR152e 98
FR153e 98
FR253e 101
JF50S 91
JF60 90
JF80 93
JF100e 97
JF200e 98
JF260z 97
JF290z 97
JF560z 97
JF590z 97
KF300e 99
L8CX2XO 90
Full Range
LA212 97
LA215 97
LA325 100
LA460 97
LS432 95
LS832 97
MK2164 97
MK2194 97
MK5164 96
MK5194 97
MK8196 95
MS20 88
MS30Ci 90
MS63 95
MS103 95
SM122e 99
SM155e 98
SM200iH 98
SM260iV 98
SM400iH 101
SM500iV 98
UB12Se 89
UB22i 94
UB42 94
UB72 94
UB80 92
UB82 95
Subsytems
BH822e 109
DCS2 107
FR250z 101
KF940 109
LA118 95
LA128 98
LA400 107
SB48e 92
SB120 96
SB150 95
SB180 96
SB250 98
SB330e 96
SB528 99
SB600e 98
SB625P 98
SB750 99
SB850F 99
SB850P 99
SB850R 99
SB1000e 99
SB184C 96
SB185C 96
SB284C 99
SB284CP 99
5
SUM
3
2
1
Pin Ass ignment
(+)
(-)
Gnd
(+)
(-)
Gnd
Parametric EQ
(RN _09)
INV
Left Channel
Input
180°
0 °
4th Order Hi-Pass
(RN _07)
180°
0 °
HIGH
LOW 2 th Order All-Pass
(RN _01)
4th Order Hi-Pass
With Var iable "Q"
(RN _0 3 & RN_0 9 -1 )
4th Order Lo-Pass
(RN _08)
4th Order Lo-Pass
(RN _02 )
(+)
(-)
Gnd
Out+
Out-
Balanced
Outputs
Out+
Out-
(+)
(-)
Gnd
High
Low
+
-
Parametric EQ
(RN _09)
INV
180°
0 °
4th Order Hi-Pass
(RN _07)
180°
0 °
HIGH
LOW 2 th Order All-Pass
(RN _01)
4th Order Hi-Pass
With Var iable "Q"
(RN _0 3 & RN_0 9 -1 )
4th Order Lo-Pass
(RN _08)
4th Order Lo-Pass
(RN _02 )
Su mmed
Channel Input
(+)
(-)
Gnd
Out+
Out-
Out+
Out-
(+)
(-)
Gnd
High
Low
(+)
(-)
Gnd
Parametric EQ
(RN _09)
INV
180°
0 °
4th Order Hi-Pass
(RN _07)
180°
0 °
HIGH
LOW 2 th Order All-Pass
(RN _01)
4th
With Var iable "Q"
(RN _0 3 & RN_0 9 -1 )
4th Order Lo-Pass
(RN _08)
4th Order Lo-Pass
(RN _02 )
(+)
(-)
Gnd
Out+
Out-
Out+
Out-
(+)
(-)
Gnd
High
Low
+
-
Lef t/ Right
Summed
Input
MX250 BLOCK DIAGRAM
Right Channel
Input
Left Channel
Outputs
Right Channel
Outputs
Order All-Pass
Summed-Mono
Outputs
6
-
+
1
2
3
J_08
R_02
R_05
R_01
R_03
C_01
C_02
-
+
U_09B
C_08
C_09
R_15
R_14
R_13
-
+
U_08A
-
+
U_09A
-
+
U_06A
-
+
U_05A
-
+
U_05B
C_31
C_26
C_28
C_29
-
+
U_06B
-
+
U_14A
C_15C_22
RN_09-1
R_20
R_22
R_23
R_21
R_19
-
+
U_02B
C_12
C_13
R_18
R_16
R_17
-
+
U_03A
C_23
-
+
U_04A
-
+
U_04B
C_14
-
+
U_02A
-
+
U_03B
C_11
C_16
C_17
C_19
-
+
U_10B
-
+
U_10A
R_55
R_54
R_52
RN_09-7
-
+
U_14B
R_43
R_44
R_49
R_72
R_71
C_64
C_52
RN_09-6
R_06
C_56
C_66
R_79
R_80
R_51
R_48
R_47
-
+
U_16B
R_12
R_64
R_66
R_67
R_07
-
+
U_16A
C_04
C_30C_27
R_11 R_10
-
+
U_07A
R_38
R_37
R_40
R_39
R_42 R_41
R_36 R_35
C_34
C_32
C_35
C_37
C_06
-
+
U_07B
R_09
R_08
-
+
U_01B
-
+
U_08B
C_07
-
+
U_01A
RN_09-3RN_09-5
+
C_53
+
C_57
VR_01
R_53
R_56R_57
VR_03
R_65
R_68R_69
1
2
3
J_06
SW3
1
2
3
J_05
-
+
U3AR6
R5
C_18
C_10
C_33 C_36
C_71
J1
C5
L1
+
C2
+
C3
SW1S1
U2
U1
+
C4
+
C1
J2
D9
D6
D5
R2
R1
D1
SW2
RN_09-4
C_05
+
C_03
RN_09
J5 J3
R4
R3
C_72
C_67
C_68
R_78
R_81
R_70
R_73
D_01
D_02
10S2125A
MX250 CLOSE COUPLED ELECTRONIC PROCESSOR
12/27/99JRD
A
WHITINSVILLE, MA 01588
ONE MAIN STREET
NONE 11
REV.
DRAWING NO.
SCHEMATIC DIAGRAM
DATE:
DATE:
OFSHEETSCALE:
APPROVED:
DRAWN:
EASTERN ACOUSTIC WORKS
+A
-A
Q
F
F
Q
7
6
5
4
3
2
1
87
6
5
4
3
2
1
78652134
65
43
21
CW
CW
5
6
8
7
2
1
3
4
8
7
5
6
1
2
4
3
ALL CAPACITOR VALUES ARE MICROFARAD
UNLESS OTHERWISE NOTED ALL RESISTORS ARE 5%
RIGHT CHANNEL = "1xx" - CENTER = "2xx" - LEFT = "3xx"
PART NUMBERS WITH NO "_" PREFIX ARE UNIQUE COMPONENTS
THE "_" PART NUMBER PREFIX REFLECTS WHICH CHANNEL IS USED.
NOTES:
FREQUENCY (Hz) TIME (S)
(Pi)Fr
2
T =
GROUP DELAY
4th ORDER HI-PASS and LO-PASS FILTERS
-9
WHEN C = .001uF
WHEN C = .01uF
-8
(8.9 x 10 )F
(8.9 x 10 )F
1
1
R =
R =
ALL-PASS
(Pi)RC
.7071
Fr =
* 14 PIN DIP
RES. NETWORK
-15V TO ALL OPAMPS
+15V TO ALL OPAMPS
6-7
5
84
2
1
L
R
INOUT
IEC 320
ACINLET
3
1
2
3
2
1
3
120/240
NEUT
GROUND
HOT
POWER
240V120V
1%
1%
1%
1%
1%
1%
1%
1%
10.0k 1%10.0k 1%
10.0k 1%10.0k 1%
10.0k 1%10.0k 1%
ONE OF TWO SHOWN
BALANCED INPUTS (LEFT-RIGHT)
30K
0
0
10.0K
10.0K
10.0K
10.0K10.0K
10.0K
10.0K
* RN_02
* RN_01 (3)
* RN_03
****
YEL
1.5K
1.5K .1uF
.1uF
1.5uF
1.5uF
4003
4003
40034003
4003
4003
4003
4003
.1uF
* RN_08
* RN_07
****
47uF
27P
FROM LEFT-CEN-RIGHT INPUT
10K
10K
47u
47u
7915
7815
PARAMETRIC EQ.
-A+A
Q
F
F
*
**
.01
.01
*
*
2.7K RES NET
4.99K
CENTER CHANNEL INPUT SUMMING
CENTER
LEFT & RIGHT SUM
RIGHT
LEFT
INPUT INVERTER
10K
10K
10K
10K
47NP
47NP
47NP
47NP
.1
.1
.1 .1 .1 .1
.001
.001
.001
.001
.001 .001
27p
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01 .01
35V
1000
35V
1000
INPUT
10K
10K
10K
10K
10K
10K
** **
*
*
*
10k
10k
10k 10k
10k
10k
LO IN
HI IN
180
180
180
0
0
0
680
680
680
680
4th ORDER HI-PASS
HIGH OUTPUT
LOW OUTPUT
4TH ORDER LO-PASS
4TH ORDER HI-PASS WITH VAR. "Q"
2ND ORDER ALL-PASS
4TH ORDER LO-PASS
*
*
*
*
1k
100
27p
27p
10k
10k
1k
100
27p
27p
10k
10k
100
100
1k
1k
1k
1k 1k
1k 1k
1k
Q
* R
27P
27P
27p
27p
10k
10k
10k10k
10k
10k
(NONE)
D7
D8
D2
D3
R-U3B
L-U4A
7
PN 425011 | 06 00
All data,drawings and specifications published in this manual are subject to change without notice. EAW assumes no liability for typographical
errors.All the information contained herein has been carefully checked for accuracy.Nevertheless,no warranty whatsoever of product
performance is implied or assumed.
Terms of the EAW Warranty
EAW Professional Active Electronics devices are guaranteed for a period of two years from the date of original purchase against malfunction
due to defects in workmanship and materials.During the warranty period,EAW will remedy all such defects without charge for parts or labor
upon the return of the unit together with its original sales receipt or other proof of purchase to EAW or to an authorized EAW service facility.
This warranty does not extend to damage resulting from improper installation,misuse,neglect or abuse.Defects in or damage to the exterior
appearance of EAW products are specifically excluded from this warranty. In no event shall EAW be liable for incidental or consequential
damages.Repairs and/or modifications by other than EAW or its authorized service facilities automatically void this warranty.This warranty
gives you specific legal rights,and you may also have other rights which vary from state to state.For more information concerning EAW service
and warranty policies,contact EAW.
EAW is the worldwide technological and market leader in the design and manufacture of high-performance,professional loudspeaker systems
Eastern Acoustic Works One Main Street, Whitinsville, MA 01588 800 992 5013 / 508 234 6158 www.eaw.com
/