JBL MS-A1004 User manual

MS-A1004
Digital signal processing amplifier
by HARMAN
®
USER GUIDE

,
;;0-
f 1- 30A -I
E
.....
~~i
11- 30A -I
C.I
./
-
2x 30A
~
UD~
2

MS-A1004FEATURES
oInput-Level Control
Used to match the input sensitiv-
ity to the signal voltage for proper
analog-to-digital conversion. See
"Setting the Input Level, and En-
abling or Disabling Signal-Sensing
Tum-On" for details. DO NOT use
these controls for setting the relative
output level of amplifier channels!
•Input Signal Selector
Lo/Hi/Hi2 sets the input
voltage and impedance range. See
"Setting the Input Level, and
Enabling
or Disabling Signal-Sens-
ing Tum-On" and "The factory-
installed system
in my car shows a
'speaker disconnected' message,
or it fails to play when aspeaker is
disconnected or when an amplifier
is connected to its output. What
should Ido?" for details.
•Audio Inputs
Use RCA audio cables for preamp-
level connections or the included
RCA-to-bare-wire adapters for
speaker-level input connections.
•Summed Pass-Through Outputs
Input channels 1and 3are com-
bined and sent to one output.
Inputs 2and 4are combined and
sent to the other output.
oOn board Fuses
2 x 30A ATC type.
"Channels 1and 2Display Panel
Displays the settings of channels 1
and 2 of the amplifier.
oChannels 3and 4Display Panel
Displays the settings of channels 3
and 4ofthe amplifier.
oUser Controls
Allows adjustment of amplifier set-
tings. See "MS-A1 004 User
Controls" for details.
CD +12V Power Input
Connect to vehicle battery with a
60A fuse within 18 inches (45.7cm)
ofthe positive battery terminal.
dV Remote Turn-On Input
Connect switched +5V to + 12V.
NOTE: The MS-A1004 also in-
cludes signal-sensing tum-on.
You
may choose the tum-on method
during setup. See "How does the
digital input mixer work?" and "MS-
A1004 Connections" for details.
•Chassis Ground Input
Connect to apaint-free spot on the
vehicle chassis.
4B Speaker Outputs
3
MS-A1004
DIGITALSIGNAL PROCESSING AMPUFIER
PLEASE READ THIS BEFOREYOU BEGIN!
JBL ®MS Series amplifiers include many features not found on conventional car audio amplifiers. Also, the setup procedure
for MS Series amplifiers is different from that of conventional car audio amplifiers. The following overview of features and
functions will help you plan agreat system and make the best use ofthe MS-A1004
's innovative features.
About the digital signal processing (DSP) included in MS Series amplifiers:
All ofthe signal processing in MS Series amplifiers is digital. Digital signal processing, along with the intuitive controls and
display included
in MS Series amplifiers, makes precise setup easy. Only the input-level controls are analog.
Will my settings be lost if Idisconnect the amplifier or the car's battery?
No. All ofthe DSP settings are stored in nonvolatile memory, so no settings will be lost if power is removed from the amplifier.
Why are the input-level controls analog?
In order to provide the best signal-to-noise ratio and to maximize the resolution ofthe digital-to-analog conversion, the
maximum input signal level
to the analog-to-digital (ND) converters must be precisely set. This must be an analog control.
The included setup CD and the procedure described
in this manual make setting the level simple and precise. Once the
input-level control is set, the control should not be used to "tune" the system. Use the digital output-level control to adjust the
relative level between amplifier channels
to tune the system.
FCC REGULATIONS
Caution:
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
Compliance statement:
1: This device is verified to comply with Part 15 of the FCC Rules. Operation subject to the following two conditions: (1) this
device may not cause harmful interference, and
(2) this device must accept any interference received, including interference
that may cause undesired operation.
2: This equipment has been tested and found to comply with the limits for aClass Bdigital device, pursuant to Part 15 ofthe
FCC Rules. These limits are designed
to provide reasonable protectiol9 against harmful interference in aresidential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,there
is no guarantee that interference will not
occur in aparticular installation.
If this equipment does cause harmful interference to radio or television reception, which can
be determined by tuming the equipment off and on, the user
is encouraged to try to correct the interference by one or more of
the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into
an outlet on acircuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radiolTV technician for help.

Why are the signal inputs and speaker outputs numbered rather than labeled "left" and "right"?
MS Series amplifiers are designed to make integration into any system simple and straightforward. The amplifier
includes adigital input-mixer control, which eliminates the need for Yadapters and allows any pair of output
channels
to be driven by amono or stereo signal for maximum system-building flexibility. Labeling the channels
"left" and "right" would be confusing in some applications.
How does the digital input mixer work?
The signals from each ofthe RCA-type input connectors are converted into digital signals and sent to the digital
signal processor. Inside the DSP, those signals are routed to the speaker output pairs, according to the selections in
the input mixers. There's one input mixer for output channels 1and 2(upper display) and another mixer for channels
3and 4(lower display). For example, selecting "1" in the input mixer for channels 1and 2will send only the signal
connected to Input Jack 1to output channels 1and 2(see Figure 1). This is useful for sending amono signal to a
pair of channels.
Figure 1.
DSP
.--------
Fl--41 D~~l I
EJ I LI """"'I
,'
,- 1
Selecting "1, 2" in the input mixer for channels 1and 2will send the signal that is connected to Input Jack 1to
Output 1and the signal connected to Input Jack 2to Output 2(see Figure 2). This is designed for stereo signals.
Figure 2.
DSP
~ I'"'" ·1 """,,' I
6 1-I-np~-2- --c----:--·I I O~~21
If you want all four output channels to receive the same signal, connect that signal to Input Jack 1 (or 3) and select "1"
(or "3")
in both input mixers. If you want all four channels to receive separate signals, choose "1, 2" in one input mixer
and "3, 4" in the other. Many system configurations are possible and Yadapters are never needed. See "System
Diagrams" for more examples.
Does the amplifier include speaker-level and line-level inputs?
Yes, any input signal can be used with MS Series amplifiers. If your head unit includes RCA-type outputs, simply
plug them into the RCA-type input jacks. If your head unit does not include RCA-type outputs (as is the case with
all factory-installed systems), use the included RCA-to-bare-wire adapters. Be sure to observe proper polarity. The
signal inputs are differential and will accept any signal from 100mV (low-level) to 15V (high-level). There's no need to
use separate adapters or to precisely determine the signal voltage or type. MS Series amplifiers' onboard tools and
the setup procedure described later in this manual will make optimizing the configuration simple.
The factory-installet( system in my car shows a"speaker disconnected" message, or it fails to play when
aspeaker is disconnected or when an amplifier
is connected to its output. What should Ido?
MS Series amplifiers include three Input Signal Selector positions: Lo, Hi and Hi2. The Hi2 position includes acircuit
designed to fool the factory system into "seeing" aspeaker connected to its output. If your car has one ofthese
systems, set the Input Signal Selector
to Hi2 and follow the rest of the setup instructions.
My factory-installed head unit does not include aremote-tum-on wire. What should Ido?
MS Series amplifiers include signal-sensing turn-on. Aremote-tum-on connection is never required. The amplifier will
sense the presence of
an audio signal at its inputs and turn on automatically. Afew minutes after the signal stops or
after the radio is turned off, the amplifier automatically will turn itself off. During the delay, the amplifier draws very little
current so the vehicle's battery won't be drained.
4

What is the best procedure for choosing acrossover frequency and slope (see Figures 3a and 3b)?
Acrossover is apair
of filters that divide the audio signal into low frequencies (bass) and high frequencies (treble) so that
only the appropriate signals are sent
to speakers that are designed to reproduce alimited range. For example, atweeter
is designed to play only high frequencies, and too much bass can cause damage. Awoofer is designed to make only low
frequencies and does apoor
job of reproducing high frequencies. Amidrange speaker is designed to play frequencies in
between bass and treble (midrange frequencies). Figure 3a shows how these speakers would be divided up across the
20Hz -20kHz range, using the appropriate filters (crossovers).
Figure3a. Figure 3b.
51< 10K 2. 20Hz 50 100 200
9
•
,
0
-,
~
-9
_"r II
rl2dBloct.
_"II
.r 24dB/oct
-"
'1----If-+H1+H--+-+-I-+1f+H+---+----l<+-If++l-H
-61----1f-+-v+1rt1t-+-+-I-+1f+H+---+-I+/-\Hf++l-H
91----1f-h1f-t1+t+-+-+-I-+1f+H+---+++-+1f++l-H
21----11--+t-+1-f1+-+-+-I-+1f+H+--tJ
1
/'-t--t\-1f++l-H
'1----I1-Irt-+1+N--+-+-I-+1f+H+--+--+-H:+tl-H
:t~~tttj1~~=~~j=~t~~b=::;/~=1j~~~m
:;;;: 50 100 200 500 21< 51<
When setting acrossover between alow-frequency speaker and ahigh-frequency speaker, the high-pass filter (HPF)
frequency should be chosen to keep the high-frequency speaker safe. The low-pass filter (LPF) should be set so that the
hand-off provides smooth response
in the region near the crossover frequency. When implementing acrossover between
speakers, use steep (24dB/octave) slopes for both filters
to maximize the amount of lowfrequencies that the high-fre-
quency speaker can handle safely and
to minimize the interaction of the sound between the low-frequency speaker and
the high-frequency speaker. Figure
3b shows the differences of 6dB, 12dB and 24dB/octave filter slopes.
If Ishould use 24dB/octave slopes for crossovers, why do MS Series amplifiers include 6dB and 12dB/octave
slopes too?
If your MS Series amplifier will be used to power asubwoofer in avented (ported) box, use a12dB/octave high-pass
filter to protect the subwoofer from damage by limiting the amount
of bass that's sent to the subwoofer below the tuned
frequency
of the box. A6dB/octave high-pass filter can be useful in slightly limiting the amount of bass sent to full-range
speakers
in systems where no subwoofer will be used, limiting the amount of high frequencies sent to rear speakers.
Why does each pair of channels include ahigh-pass filter (HPF) and alow-pass filter (LPF)?
In some systems, it can be useful to limit the high frequencies and low frequencies that are sent to aloudspeaker. Use
the HPF and the LPF together to create aband-pass filter for amidrange speaker
in systems where the woofer, midrange
and tweeters will be powered by individual amplifier channels. When using the filters
to create aband-pass filter, the HPF
can never be set to ahigher frequency than the
LPF. For example, if the LPF is set to 200Hz, the HPF can be set to any
frequency below 190Hz. This protection prevents errors
in setup.
10Hz 20 50 100 200 500 1K
,
0
-,
-6 I
-9 I
~~
lcf.v-Pass
Filter <I
Fitter I
-"
\
-"
\
-24 \
-27
Do MS Series amplifiers include asubsonic or infrasonic Figure 4.
filter for use with vented enclosures?
Yes. If you want to use asubsonic or infrasonic filter with your
subwoofer, configure the channel's crossover as aband-pass filter.
The low-pass filter will limit the high frequencies that are sent to the
subwoofer and the high-pass filter will be the infrasonic filter. Set the
high-pass filter frequency about 10Hz below the frequency at which
the enclosure
is tuned and use a12dB/octave slope (see Figure 4).
About the MS-WBC wireless bass control (sold separately):
The MS-WBC wireless bass control is designed to make installation easy. The circuit is designed for long battery life, and
aseparate, wired connection to +12V is included for those
who never want to replace the battery. No wired connection to
the amplifier is necessary. The control sends aradio signal to the DSP in the amplifier, so the control may be mounted in a
console
or under the dashboard and the amplifier may be mounted in the trunk or hidden behind apanel.
The amount of bass included in recordings varies greatly, and the ability to adjust the amount of bass between songs or
albums is useful. Unlike conventional remote bass controls, the MS-WBC doesn't simply increase the level
of the ampli-
fier's channels that are connected to the subwoofer. Conventional bass controls adversely affect the crossover between
the subwoofer and the mid-bass
or midrange speakers any time they are adjusted. This causes the bass to sound boo my
or muddy when it's boosted and draws the listener's attention to the location of the subwoofer (see Figure
5a).
Figure Sa. Figure5b.
51< 10K 50 100 200 500 11< 2K 10Hz 20
2
9U
Crosso'o<rFn,qLOllCy
•-
,/
COOstlnt Wrlt18ass Boost
,--
0
7'
,
9
2"
,1\
8"\
50 100 200 500 '1( 21<
10Hz 20
2
9
~~rlt1~
•
~
,
0
,
,\
.\'o
9
\\\
\\ ,
2\\
,
,\
•
5

The bass-boost filter in the MS Series amplifiers is ashelf filter that boosts or cuts bass below 60Hz, but never above
160Hz. The range
of adjustment is +/-10dB. Additionally, the bass boost or cut is sent to all the amplifiers with which the
control is paired. The bass control works with the crossover filters to ensure that the proper amount
of boost or cut is
sent to the subwoofer and the mid-bass or midrange speakers, so the character and apparent location of bass sounds
remain constant. See Figure
5b for the performance of the MS-WBC (as opposed to that of conventional bass controls,
as shown in Figure 5a).
CAUTION: Installation of car audio components requires experience in performing mechanical and electrical proce-
dures. If you feel you lack the required experience or necessary tools, please have your amplifier installed by aqualified
professional technician.
CAUTION: Before installation, disconnect the negative (-) battery terminal to prevent the battery from being drained
while you
work on the car and also to prevent damage to the unit.
READ THIS BEFORE STARTING INSTALLATION!
1. JBL MS Series amplifiers include many features not found on conventional car audio amplifiers. The setup procedure for
MS Series amplifiers
is different from that of conventional car audio amplifiers. Be sure to carefully read and understand
these instructions before attempting installation.
2. At the installation sites, locate and make anote of all fuel lines, hydraulic brake lines, vacuum lines and electrical
wiring. Use extreme caution when cutting or drilling
in and around these areas.
3. Choose amounting location for the amplifier inside the passenger or cargo area that will ensure no exposure to mois-
ture. Never mount an amplifier outside the car or
in the engine compartment.
4. Make sure there is sufficient air circulation at the mounting location for the amplifier to cool itself.
5. Mount the amplifier securely.
6

MS-A1004 CONNECTIONS
Power Inputs
1.+12V Power Input
Connect the unit to the vehicle battery using aminimum size of 8AWG
(8mm2)wire with a60A fuse placed within 18 Inches (45.7cm) of the positive
battery terminal. Be sure to use an insulation grommet at every location where
the power wire will pass through metal.
2. Remote Turn-On Input (Optional to Connect)
No discrete remote-tum-on connection to the MS-A1004 is necessary. If your
head unit includes aremote-tum-on lead and you wish to connect
it, connect
the unit
to this terminal.
3. Chassis Ground Input
Using at least 8AWG (8mm2)wire, connect this terminal to anearby point of
the vehicle's chassis (sheet metal). Scrape away the paint from the area to
ensure agood connection. Do not ground the amplifier to the vehicle's frame.
Audio Inputs
1. Using RCA Outputs
If the unit that precedes this amplifier in the signal chain includes RCA-type
output connectors, connect them directly to the RCA inputs
of this amplifier.
2. Using Speaker-Level Signals
If the preceding equipment doesn't have RCA-type connectors, use the RCA-
to-bare-wire adapters included with the MS-A1004. Connect the +signal to
the terminal marked +and the -signal
to the terminal marked -.
Pass-Through Audio Outputs (Full-Range)
Input channels 1and 3are summed and sent to the top RCA output. Inputs 2
and 4are summed and sent to the bottom RCA output. Using these outputs,
additional amplifiers can be easily added. For example: When using the MS-
A1004 for front and rear speakers, you could use these outputs for asubwoofer
amplifier. The outputs are full-range. No high-pass or low-pass filters are applied
in the MS-A1004.
Speaker Outputs
Connect each speaker to the amplifier channel that will correspond to the input
used or
how it's assigned. See "Setting the Input Mixer" to learn how to assign
the input signals to the output channel
pair. Be sure to observe proper polarity
when connecting the speakers
to the outputs.
1.Stereo Connection
Connect the left-channel loudspeaker(s) to the output terminals corresponding
to the left-channel input. Connect the right-channel speaker(s) to the output
terminals corresponding to the right-channel input.
2. Bridged Connection
Connect the positive terminal on the loudspeaker(s) to the positive (+) terminal
on Channel 1(or
3). Connect the negative terminal on the speaker(s) to the
negative (-) terminal on Channel 2(or
4).
See "System Diagrams" for examples of system configurations in which the
amplifier
is most commonly used.
7

MS-A1004 DISPLAY ICONS
6dB
12dB
24dB
oInput-Level Settings
CJl:> Input Setup Mode Active
.. ~ Input Sensitivity Too High
tI ~ Input Sensitivity Correct
•
~ Input Sensitivity Too Low
Low-Pass Filter
oFrequency GSlope
~ ~
1-11-11-1
1="_1.1_1 Hz
This setting
does not affect
pass-through
output.
*The MS-WBC wireless bass controller
is an optional accessory.
Pairing Confirmation
Bass-Level Controller Pairing*
ct;)D
C1D Protection
'" Amplifier Protection
~ Circuit Engaged
CD Channel ID
1,2 Indicates the amplifier channels
3,4 affected by the row of settings
to the right in the display. (Chan-
nels 1, 2 use the upper display
and channels
3,4 use the lower
display.)
eOutput Gain Adjustment
rY1... Output Gain
~ Adjustment Active*
--
I II 1Output Gain Level (0 to 80)
-.
I II I*Muted when In "Setup Mode"
--
QAdjustment-Selection Indicator
!When lit, the paramater above
o is selected for adjustment.
Hz
Indicates which signal
inputs are selected to
feed the channel pair's
outputs
Input Mixer
6dB
12dB
24dB
High-Pass Filter
eSlope oFrequency
~ r
1-11-11-1
1=11_1.1_1
elnput Channel Mixer
~
1:2 }
3,4
8

MS-A 1004 USER CONTROLS
Rotary Encoder
Rotates clockwise (CW) and counterclockwise (CCW). Each
detent represents avalue increase
(CW) or decrease (CCW).
Counterclockwise -----..
(CCW) Button
Move selectable option
counterclockwise
(CCW) one value.
o
cL
-Move selectable
option clockwise
(CW) one value.
+~
Mode Access Control
Pressing both the left and right buttons
simultaneously for specified time periods
accesses various modes
of the amplifier.
1
1,2
3
3,4
9
MS-A1004 SETTINGS GUIDE
INITIAL SETUP
Activating the Controls
Press both CCW and CW buttons at the same time for less than three seconds
and release, to activate the controls. The adjustment selector indicator
~
will light. Use the CCW and CW buttons to move the indicator to the
parameter you wish to adjust. After you've made your adjustments and
the controls have been inactive for more than 30 seconds, the selection-
indicator light will go out and the controls will become deactivated to
prevent unintentional adjustment of the amplifier's controls.
Setting the Input Mixer
@-6) Once the controls are active, press the CW or CCW button until the input mixer is
00 selected for channels 1and 2 (in the upper display) iQi. Turn the rotary control to select
the input connector(s) that will feed output channels 1and 2. Press the
CCW button
once to move the selection indicator to the input mixer for channels 3and 4
(in the
lower display). Turn the rotary controller to select the input connector(s) that will feed
output channels 3and 4.
See "System Diagrams" for practical examples.
Setting the Input Level, and Enabling or Disabling Signal-Sensing Turn-On
BEFORE YOU BEGIN
If the factory system to which you have connected your MS Series amplifier shows a"speaker
disconnected" error message
or fails to provide an output signal, move the Input Signal Selec-
tor to the Hi2 position.
It may be necessary to turn the factory-installed head unit or the vehicle
itself off and then back on, to reset the error message.
((1 gm i~ NOTE: The Hi2 setting. should not be used with the RCA outputs
~'-J-=_WlilllW __ dJj/ of aftermarket head units!
Lo Hi ~

Ol:> To Set the Input Level:
1. Move the switch for the Input Signal Selector to the Hi position (or Hi2, if you are connecting to afactory
system with open-circuit protection).
2. Set the bass, treble, balance and fader controls on your head unit to the center (or flat) positions. Set
loudness to off. Defeat any sound-enhancement (such as
DSP, surround sound or EO) settings.
3. Insert the setup CD into your head unit and verify that the CD is playing.
4. Enter Setup mode by pressing CW and CCW buttons simultaneously for more than three seconds until
the Input Level adjustment icon
I[=:JJ:> lights. The amplifier's output will be muted (the output-level indi-
cator will show
"_ _" in the display).
5. Turn the head unit's volume control all the way up (to maximum output).
6. Using asmall screwdriver on the level-adjustment dial next to the Input Signal Selector switch,
adjust the Input-Level Control up or down, while watching the icons on the amplifier's display panel.
If the green "up" arrow ... icon is lit, turn the control clockwise until the &icon is lit.
If the red "down" arrow .. icon is lit, turn the control counterclockwise until the &icon
is lit.
NOTE:
If turning the control fully clockwise doesn't cause the &icon to light, move the switch for
,,:::!=~::::f.;;I the Input Signal Selector to the Lo position and try again.
Once the &icon is lit, stop adjusting and repeat the procedure to set the input level on the other channels.
When both check marks are lit, the input levels for each channel pair are set properly.
To Enable or Disable Signal-Sensing Turn-On:
7. While in Setup mode, enable/disable signal-sensing turn-on
by turning the rotary controller clockwise
or counterclockwise
to select SEn On or SEn OFF in the display. If you have
connected aremote turn-on lead, set to SEn
OFF.
8. Turn the volume control on your head unit down and remove the '-- __ --&--':...- __ --':...-_--&
setup CD. If you miss or circumvent this step, the audio system
will reproduce aloud test signal that could damage speakers when exiting the Setup mode.
9. Press and release the CW and CCW buttons simultaneously to exit Setup mode.
10.Do not adjust the Input-Level Controls further. Use the Output Gain Control
to balance the channel levels
and to "tune" the system.
High-Pass Example
Use the CW and CCW buttons to navigate to the Low-Pass frequency
parameter and set to OFF.
Getting to the Crossover Settings
Press both CCW and CW buttons at the same time for less than three
seconds and release, to activate the controls. Use the CCW and CW
buttons
to navigate to the preferred crossover-adjustment parameter.
SETTING THE FILTERS (CROSSOVERS)
There are 98 selectable frequencies for the low-pass and high-pass
filter settings. The selectable frequencies are detailed
in the table to the
right.
How to Set aHigh-Pass Filter
Navigate to the high-pass filter frequency parameter r- and, using the
rotary encoder, select the desired cutoff frequency. Then navigate to
the high-pass filter slope parameter
-r and, using the rotary encoder,
select the desired filter slope.
Available Crossover Frequency Settings
20.0Hz 95.0Hz 260Hz 1040kHz 4.80kHz
22.5Hz 100Hz 270Hz 1.50kHz 5.00kHz
25.0Hz 105Hz 280Hz 1.60kHz 5.50kHz
27.5Hz 110Hz 290Hz 1.70kHz 6.00kHz
30.0Hz 115Hz 300Hz 1.80kHz 6.50kHz
32.5Hz 120Hz 350Hz 1.90kHz 7.00kHz
35.0Hz 125Hz 400Hz 2.00kHz 7.50kHz
37.5Hz 130Hz 450Hz 2020kHz 8.00kHz
40.0Hz 140Hz 500Hz 2040kHz 8.50kHz
42.5Hz 150Hz 550Hz 2.60kHz 9.00kHz
45.0Hz 160Hz 600Hz 2.80kHz 9.50kHz
50.0Hz 170Hz 650Hz 3.00kHz 10.0kHz
55.0Hz 180Hz 700Hz 3.20kHz 12.0kHz
60.0Hz 190Hz 750Hz 3040kHz 14.0kHz
65.0Hz 200Hz 800Hz 3.60kHz 16.0kHz
70.0Hz 210Hz 900 Hz 3.80kHz 18.0kHz
75.0Hz 220Hz 1.0kHz 4.00kHz 20.0kHz
80.0Hz 230Hz 1.10kHz 4.20kHz
OFF
85.0Hz 240Hz 1.20kHz 4040kHz
90.0Hz 250Hz 1.30kHz 4.60kHz
~
[IFF
.r T-
ann
24dB OLJLI Hz
How to Set aLow-Pass Filter
Navigate to the Low-Pass Filter frequency parameter r- and, using the rotary encoder, select the desired
cutoff frequency. Then navigate
to the Low-Pass Filter slope parameter -r and, using the rotary encoder,
select the desired filter slope.
Low-Pass Example
Use the CW and CCW buttons to navigate to the High-Pass frequency parameter and set to OFF.
T-
nFe
1-' I
~ ~
ann
I='U.U Hz 24dB
10