DLM-821
Stereo
Ducking Line/Microphone
Mixer
Operating Manual
ASHLY AUDIO INC.
847 Holt Road Webster, NY 14580-9103 Phone: (585) 872-0010
Toll-Free: (800) 828-6308 Fax: (585) 872-0739
www.ashly.com
2
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
Table Of Contents
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 SECURITY COVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5 CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 CONNECTIONS AND CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7 TYPICAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1 Small Sound Reinforcement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.2 Church, School Or Meeting Room Sound System . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.3 Restaurant/Sports Bar System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
9 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
10 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
11 WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
12 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
3
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1. INTRODUCTION
Congratulations on your purchase of an Ashly
DLM-821 stereo duc king line level mixer. Features include
eight balanced stereo inputs for line level sources, the first
four inputs with switchable 30dB gain for low impedance
microphones. +18V phantom power and stereo/mono switch-
ing is
provided for inputs 1 through 4. A concentric level
and pan control for each input adjusts channel volume and
stereo position.
A ducking circuit allows a signal on either channel
1 or 2 to duck (attenuate) the signal on channels 3 through
8. Internally the DLM-821 can be configured for ch.1 pri-
ority whereby a signal on ch. 1 has priority over the signal
on ch. 2 and fully attenuates channels 2 through 8. Further-
more, the ducking level can be configured for -20dB or
-90dB, ch. 2 ducking may be disabled, and the left and right
signal ducking may be disabled independently. Ultra low
noise summing amplifiers combine the channel signals for
the main outputs. A pair of 6-segment LED meter arrays
monitor the main output levels. Separate level controls are
provided for stereo, mono, and headphone outputs.
2. UNPACKING
As a part of
our system of quality control, e very
Ashly product is carefully inspected before leaving the
factory to ensure fla wless appearance. After unpacking,
please inspect for any physical damage. Save the ship-
ping carton and all packing materials , as they were care-
fully designed to reduce to minimum
the possibility of
transportation damage should the unit again require pack-
ing and shipping. In the e vent that damage has occurred,
immediately notify your dealer so that a written claim to
cover the damages can be initiated.
The right to any claim against a public carrier
can be forfeited if the carrier is not notified promptly and
if the shipping carton and packing materials are not avail-
able for inspection by the carrier. Save all packing mate-
rials until the claim has been settled.
3. AC POWER REQUIREMENTS
The DLM-821 will perform normally from 98 to
125 volts AC. Use only properly grounded AC recep-
tacles. To reduce the risk of ground loop hum, use a cen-
tral point for system AC power distribution. The AC line
fuse is internal, and should only be changed by a quali-
fied service technician.
4. SECURITY COVERS
For installations where it is desirable to protect
the front panel controls from tampering or accidental
misadjustment, use the Ashly security cover, which is
available in both single and double rack space sizes. In-
stallation is simple and does not require removal of the
equipment from your rack. See your Ashly dealer for
details.
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Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
5. CONTROLS
5.1 Ducking Enable
Pressing this switch enables a signal present on
inputs 1 or 2 to duck (attenuate) the signals on inputs 3
through 8. See sections 5.14 through 5.17 for internally
selecting different ducking configurations.
5.2 Channel Level and Pan
The inner knob is the individual channel volume
control which feeds a channel to the main mix. The "5"
position corresponds to unity gain. The outer knob is the
Pan control and adjusts the position of the channel in the
stereo mix.
5.3 Mute Switch
This switch on each channel will turn the chan-
nel completely off allowing the channel level to remain
at its desired setting when the input is not needed.
5.4 Mic/Line Switch
This recessed switch on the first four inputs in-
creases the channel input sensitivity by 30 dB to allow
the use of low impedance microphones. The adjacent
yellow LED on indicates the switch is depressed and 30dB
of gain is added for that channel's mic input.
5.5 Output Meters
A pair of peak detecting 6-segment LED meters
are used to indicate output level. Green LED's are used
below 0 VU, yellow above 0 VU, and red LED's indicate
clipping. This meter pair monitors the main stereo out-
put (0 VU = +4dBu). The red clipping LED's also moni-
tor all input channels, making it possible for these
indicators to illuminate even with the stereo output level
turned off.
5.6 Stereo Output Level and Pan
This is the main master gain which sets the oper-
ating level for the entire mixer. The "5" position corre-
sponds to unity gain. This control does not effect the
mono output level.
5.7 Stereo Output Mute
This switch entirely mutes the main stereo out-
put. The headphone and mono output are not affected.
This is particularly useful when the DLM-821 is used as
a sub-mixer.
5.8 Mono and Headphone Level
The inner knob is the master gain control for the
mono output, which is the combined signal of the left
and right outputs. It has no effect on the stereo output.
Note: The mono output level can be selected between
mic or line level. (see sec. 5.10) The outer knob is the
level control for the front panel headphone jack.
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Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
5.9 Power Switch
The DLM-821 power switch is on the back panel.
When it is pressed in the front panel power LED will be-
come lit.
5.10 Mono Output Mic/Line Switch
This switch selects between a 0dBu (out posi-
tion) line level or -40dBu (in position) mic level signal
feeding the Mono output connector.
5.11 Stereo/Mono Input Switches
These four pushbutton switches allow selection
between a stereo or mono signal connection to input chan-
nels 1 through 4 respectively. In the Out position, stereo
left and right cables should be connected. In the in posi-
tion, a mono cable should be connected to the R(Mono)
connector which then internally feeds the signal to both
left and right sides.
5.12 Phantom Power Switches
There is a phantom power switch for channels 1
and 2 and a phantom power switch for channels 3 and 4.
Pushing the switch in applies +18VDC to the (+) and (-)
input terminals of the two associated channels to power
condenser mics. The input channels should be muted
using the On/Mute switches when switching phantom
power on or off to avoid any pop noises.
Internal PCB Jumper Options:
5.13 Ch. 2 Detect Enable *
Internal jumper J1 allows enabling or disabling
the ducker detector for ch. 2. (factory default is enabled)
5.14 Ducking Level *
Internal jumper J16 allows selection between
-20dB ducking level and -90 dB ducking level. (factory
default is -20dB)
5.15 Ch. 1 Priority *
Internal jumper J6 allows enabling ch. 1 to have
priority over ch. 2 and fully attenuate channels 2-8. This
feature is useful for applying an emergency page or alarm
on channel 1 and applying a normal host page input on
ch. 2. (factory default is ch.1 priority disabled)
5.16 Left and Right Ducking Enable *
Internal jumpers J14 and J15 allow the left and
right signal ducking to be enabled or disabled indepen-
dently. (factory default is left and right ducking enabled)
* For internal jumper adjustments, remove AC
cord from rear of unit and refer to a qualified service
technician. (see PCB jumper locations in fig. 5.2)
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Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
Ashly Audio Inc.
Fig. 5.2 - DLM-821 Internal Jumper Locations
6. CONNECTIONS AND CABLES
6.1 Inputs
The DLM-821 stereo inputs use two 20k ohm balanced (10k ohm unbalanced)
Euroblock connectors per channel. Wire the (+) signal to the (+) terminal, the (-) signal
to the (-) terminal, and the shield to G. If an unbalanced (two conductor) input signal is
used, connect the shield to both (-) and G.
To drive a mono source into the stereo mix, simply plug the signal into the
right channel input and press the Mono s witch in. Additionally, channels 1 through 4
are switchable to mic level (see sec. 5.4) to add 30dB gain for microphone inputs.
6.2 Main and Mono Outputs
Outputs are 200 ohm "pseudo-balanced" Euroblock connectors, which have bal-
anced impedance with a single-ended signal source and can be wired balanced or un-
balanced. Nominal operating level is +4 dBu and maximum level is +23dBu. The
Mono output is switchable to a nominal -40dBu microphone level. If wiring an output
as unbalanced, use the (+) and G connections.
If low level and high level lines (e.g., microphones and mixer line outputs), or
if either of these lines and speaker cables are run parallel for long distances, crosstalk
may be significant. In fact, the crosstalk (signal leakage between cables) can cause an
electronic feedback loop, oscillation, and possibly damage to the equipment. To mini-
mize crosstalk, physically separate low level (microphone) cables from speaker cables
by the greatest feasible distance. At any point where cables meet, run low level cables
perpendicular to high level or speaker cables. If low and high level or speaker cables
must be run parallel and in close proximity to one another, they should be bundled
separately. Shielded cable should always be used for mic and line cables.
Euroblock
Input
Connections
+
-
G
+
-
G
+
-
G
+
-
G
Unbalanced
Input
Balanced
Input
+
-
G
+
-
G
+
-
G
+
G
Unbalanced
Output
Balanced
Output
Euroblock
Output
Connections
7
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
7. TYPICAL APPLICATIONS
7.1 Small Sound Reinforcement System
In the setup shown here, the DLM-821 is used to mix typical sound sources that might be found in a small
club, school theater or similar environment. INPUT channels 1 & 2 are used for microphones for live vocal or instru-
mental pickup. INPUT channels 3-8 are used for the output of electronic music devices such as keyboards, MIDI
sound modules, drum machines, etc. The power amplifier (or any additional graphic equalizers or electronic cross-
overs which may be used) is fed from the MAIN OUTPUT connectors.
7.2 Church, School Or Meeting Room Sound System:
Here the DLM-821 is used to mix sources typically found in a church, classroom, or meeting room. The
channel 2-4 inputs are used for microphones for live vocal or instrumental pickup. Channel 1 is fed by an alarm signal
which will have priority and fully attenuate all other inputs if it is receiving an input signal. Channels 1 through 4 will
have their Stereo/Mono switch pushed in. The remaining INPUT channels are used for audio outputs from video/DVD
players, cassette deck, CD player, computer sound card, etc. One input channel is reserved as a spare. The power
amplifier (or any additional equalizer or electronic crossover which may be used) is fed from the MAIN OUTPUT
connectors. The Mono output is connected into the wall mic jack to feed the mix into the building's main PA system.
Here the Mono Output selector
switch should be pushed in
for a mic-level signal.
Microphone
Inputs
On Ch. 2 - 4
(Mono Switch In)
Left and Right
Speakers
DVD/CD Player
Videotape Audio
Stereo
Power Amplifier
Laptop Audio
Alarm or
Priority Override
Audio Source
(Mono Switched In)
Mono Output to
Wall Mic Input
for Secondary PA
(Set Mono Output
to Mic level)
Microphone
Inputs
On Ch. 1 and 2
(Mono Switch In)
Stereo Keyboard Input
On Ch. 3
Left and Right
Speakers
Stereo Drum Machine
Inputs On Ch. 4
DVD/CD Player
Midi Sound Module
Stereo
Power Amplifier
Cassette Tape
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Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
7.3 Restaurant/Sports Bar System:
In this application, a variety of line level audio signals (tape, CD, satellite background music and TV) are fed
into line inputs five through eight. Talent mics are fed into inputs three and four. A host paging mic is fed into input
2 which will duck (attenuate) three through eight. An emergency paging mic is fed into input one and channel one
priority is internally selected. An emergency page signal will then fully attenuate all other inputs. Inputs one through
four should all have their Stereo/Mono switches pushed in. The Mono output is fed into an existing mic mixer/PA
amplifier. The Mono output Mic/Line switch should be pushed in to give a mic-level output to this existing mic mixer.
Talent Mics
On Ch. 2 - 4
(Mono Switch In)
Stereo Speakers
DVD/CD Player
Satellite Background Music
Stereo
Power Amplifier
Tape
Satellite TV Audio
Host Mic
(Ducking)
Emergency
Page
(Priority
Ducking)
Outdoor
Loudspeaker
Output
8. TROUBLESHOOTING TIPS
8.1 No Sound
Check the AC power. Is the power switch on and illuminated? Check the level meters. If they are operating,
the problem between the mixer and the later components in the system. If not, check to see you really have an input
signal and that it is on the desired channel. Check that you have the master gain controls at the desired operating level.
8.2 Distorted Sound
Something is being overdriven in the signal path. If the clip indicators are active, reduce the channel level con-
trols. If the clip indicators are still active, reduce the input signal level. If the level meters are constantly in the red, reduce
the Master gain and increase the gain of components following the mixer. There are many gain adjustments in the mixer
itself and proba bly several others in other system components which makes it possible to overdrive an input section and
then incorrectly try to reduce the gain of the output section. The best way to approach setting gains is to establish the
operating level of input stages first by setting their gain as high as possible but leaving about 20dB of headroom for loud
peaks, then move on to set the master gain to produce a good meter reading. Proceed to set the gain of equalizers, limiters,
crossovers, and amplifiers following the mixer in the same manner, always working toward the later stages of the system.
8.3 Excessive Noise
If the noise is in the form of hiss, the problem is usually due to an input stage set up for low gain and then
compensating by increasing the master gain. Turn up the channel level controls and reduce the master gain.
8.4 Excessive hum
This is usually caused by "ground loops" in the system wiring. A complex sound system with many sources
separated by significant distance and using several power outlets has many opportunities for this problem to occur. If
possible, feed e verything in the system from one power source with a common ground.
If you need help, get in touch with your Ashly dealer or call an Ashly technical service representative at
1-800-828-6308.
9
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
9. DIMENSIONS
CROSSTALK
adjacent inputs or input to output at 1KHz . . . . <-80dB
adjacent inputs or input to output at 20KHz . . <-60dB
VU METERS
Two 5-segment LED meters. . . . . . . . . . . . .0VU=+4dBu
PEAK INDICATORS
activated when internal
signal is 3dB below clipping
PHANTOM POWER
Phantom power voltage . . . . . . . . . . . . . . . . . . . . . . +18V
SHIPPING WEIGHT
10 lb (4.5kg)
NET WEIGHT
7.2 lb (3.3kg)
POWER REQUIREMENTS
98 VA C - 125 VA C, 50-60 Hz,
15 watts (240 VA C available)
*unless otherwise stated, specification conditions are: 150
ohm source, all levels set at nominal, outputs into 2.7k
ohm or greater.
10. SPECIFICATIONS
DISTORTION
THD at +20 dBu, 20Hz-20KHz . . . . . . . . . . . . . <0.05%
HUM & NOISE (20Hz-20KHz)
residual output noise, all levels at minimum <-100dBu
MASTER OUT, MASTER LEVEL and one
INPUT LEVEL at nominal (unity gain) . . . . . <-83dBu
FREQUENCY RESPONSE
20Hz-20KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.2dB
SIGNAL LEVELS
Maximum input level . . . . . . . . . . . . . . . . . . . . . . +23dBu
Maximum output level . . . . . . . . . . . . . . . . . . . . . +23dBu
VOLTAGE GAIN (dB±1)
INPUTS
MASTER OUTPUTS (levels at nominal) . . . . . . . . 0dB
INPUT to MASTER OUTPUT (levels at max) . . . 25dB
Ch.1 - 4 INPUT in MIC position to
MASTER OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . 56dB
DUCKER
Ch. 1-2 ducking threshold (mic) . . . . . . . . . . . . . -60dBu
Ch. 1-2 ducking threshold (line) . . . . . . . . . . . . . -30dBu
Ch. 3-8 default ducking level . . . . . . . . . . . . . . . . .-20dB
Ch. 3-8 optional ducking level . . . . . . . . . . . . . . . . -90dB
!"#$%&'+
0.10
6.00
(432)
1.25
(44) (29)
17.00
(152)
1.75
(32)
1.15
(2.5)
19.00 (483)
18.375 (4 67)
10
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
11. WARRANTY INFORMATION
Thank you for your expression of confidence in
Ashly products. The unit you have just purchased is pro-
tected by a five-year warranty. To esta blish the warranty,
be sure to fill out and mail the warranty card attached to
your product. Fill out the information below for your
records.
Model Number _________________________________
Serial Number __________________________________
Dealer _______________________________________
Date of Purchase ________________________________
Dealer’s Address ________________________________
_______________________________________
_______________________________________
Dealer’s Phone _________________________________
Salesperson ____________________________________
11
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1 2 3 4 5 6 78
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size
Drawn B
y
Rev.
D
10s8210-1.Sch
10S8210
DLM-821
(
Out
p
uts and Duckers
)
James B Franks
Sheet # of
16
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
(716) 872-0010
(716) 872-0739
Print Date
22-Jan-2004
11:47:56
A->B @ 157%
C
5
6
7
U6B
4560
3
2
1
8 4
U6A
4560
3
2
1
8 4
U3A
4560
5
6
7
U5B
2043
3
2
1
8 4
U7A
2043
5
6
7
U3B
4560
J9
SlimJack
R5
68
R7
68k
R11
4.7k
VR1B
C100K
R8
68k
3
2
1
8 4
U5A
2043
R6
68
R9
68k
R12
4.7k
VR1A
C100K
R10
68k
R14
100
10
11
12
SW2D
R15
100
7
8
9
SW2C
R22
5.6k
R26
15k
R16
100
R29
100k
C14
none
C5
1.5U
C16
47U
D11
1N4148
R23
5.6k
D12
1N4148
R31
22k
C28 27p
R39
2k
VR2D
B20K
R45
10k
C17
47U
3
2
1
8 4
U4A
4560
5
6
7
U4B
4560
R24
5.6k
R27
15k
R17
100
R30
100k
C15
none
C6
1.5U
C18
47U
D13
1N4148
R25
5.6k
D14
1N4148
R32
22k
C29 27p
R40
2k
VR2C
B20K
R46
10k
C19
47U
Ri
g
ht Output
Headphone Output
Left Output
Ri
g
ht Output Mute
Left Output Mute
VR2B
B20K
VR2A
B20K
Pan
(+0.4dB At Center)
Master Level
(+3dB Mid, +18dB Max)
R51
33k
D15
1N4148
5
6
7
U7B
2043
R52
33k
D16
1N4148
R37
22k
R38
22k
R28
15k
R13
4.7k
C24
47U
VR1C
B10k
R4
1k
R49
10k
C32
68p
C25
47U
D17
1N4148
D18
1N4148
R20
100
R50
10k
R21
100
Mono Output
Mono Level
(Shown Out)
(Shown Out)
C10 10pf
C11
10pf
C12
10pf
C13
10pf
C35
.1U
C36
.1U
-18
+18
RPeakBus
LPeakBus
RBus
LBus
Channels 3-6
10S8210-3.sch
Revision Sheet
10s8210RV.sch
CH 7 & 8 + Power Supply
10S8210-4.sch
RMeter
RPeakBus
LMeter
LPeakBus
Meter Cards and Indicators
10s8210-5.Sch
+18
-18
R18
4.7K
R66
None
R64
0
R55
33K
R34
33K
C22
10P
3
2
1
8 4
U1A
2043
LBus
LDuckBus
LPeak
LSum
RPeak
RSum
RPeak
LPeak
RPeak
LPeak
RMeter
LMeter
LPeak RPeak
LBus
RBus
+18
-18
R3
4.7K
R65
None
R63
0
R47
33K
R19
33K
C9
10P
5
6
7
U1B
2043
RBus
VCA-DC
RDuckBus
D1
1N4148
D3
1N4148
RPeak
LPeak
6
5
4
3
2
1
J5
EUROBLOCK 6
RSum
LSum
Left Ducking VCA
Right Ducking VCA
-18
+18
3
2
1
J4
EUROBLOCK 3
-18
+18
-18
+18
-18
+18
+18
-18
-18
+18
C37
.1U
C41
.1U
C26
.1U
C21
.1U
RPeakBus
LPeakBus
RBus
LBus
Channels 1-2
10S8210-2.sch
5
6
7
U10B
4560
3
2
1
84
U10A
4560
-18
+18
C23
.1U
2
1 8
5 7
4
6
3
+
-
U11
2180LC
2
1 8
5 7
4
6
3
+
-
U12
2180LC
5
6
4
2
3
1
SW1A
R2
100
1
2
3
J14
HDRM 1X3
1
2
3
J15
HDRM 1X3
J8
J2
Mic/Line
(Shown Out)
(Line = Out)
C42
.1U
C40
.1U
Enable
Enable
R33
47K
R35
2.7K
12. DLM-821 SCHEMATIC DIAGRAMS
12
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1 2 3 4 5 6 78
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size
Drawn B
y
Rev.
D
10S8210-2.sch
10s8210
DLM-821
(
Channels 1-2
)
James B Franks
Sheet # of
26
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
(716) 872-0010
(716) 872-0739
Print Date
22-Jan-2004
11:44:12
A->B @ 157%
C
R103
1.15k
R104
1.15k
R108
1.15k
R105
1.15k
R106
39.2k
R107
39.2k
C104 27p
C103
27p
5
6
7
U101B
2043
3
2
1
8 4
U101A
2043
D103
1N4148
D104
1N4148
R110
10.0k
R109
10.0k
R112
10.0k
R111
10.0k
C106 27p
C105
27p
R113
5.6k
R114
5.6k
R115
5.6k
R116
5.6k
VR101A
B20k
VR101B
B20k
VR101D
B20k
VR101C
B20k
7
8
9
SW102C
10
11
12
SW102D
Right/Mono/Mic
Left
Channel 1
Mic/Line
Mic/Line
Level
Level
Pan
In-Mic
In-Mic
5
6
4
SW101B
10
11
12
SW101D
In
In
Channel 1 Mute
In = Channel On
A
B
D
C
Four-Ganged Pot
CW
C107
.1U
C108
.1U
-18
+18
1
2
3
7
8
9
4
5
6
10
11
12
AB
DC
4PDT Switch
R59
1K
R60
1K
CH1 Det
1
2
3
J1
5
6
7
U2B
TLE2064
3
2
1
84
U13A
NJM2903
5
6
7
U17B
NJM2903
C27
47U
R73
33K
+18
D4
1N4148
C30
.1U
R1
1M
R61
560
R62
1K
R36
33K
R74
18K
+18 +18
/ATTN
R77
10M
Q2
2N4123
Q1
2N4125
R76
470K
5mA Typ.
C31
47U
D6
1N746A
5
6
4
SW DPDT
VCA-DC
2
3
1
SW3A
RPeak
6
5
4
3
2
1
J101
EUROBLOCK 6
2
3
1
SW104A
SW DPDT
5
6
4
SW104B
SW DPDT
-18
+18
LPeak
RBus
LBus
2
3
1
SW103A
SW DPDT
5
6
4
C101
47U
C102
47U
R101
3.3K
R102
3.3K
+18
10
9
8
U2C
TLE2064
R119
390K
R118
100K
R117
100K
CH1 Det
Stereo/Mono
Phantom Pwr
R203
1.15k
R204
1.15k
R208
1.15k
R205
1.15k
R206
39.2k
R207
39.2k
C204 27p
C203
27p
5
6
7
U201B
2043
3
2
1
8 4
U201A
2043
D203
1N4148
D204
1N4148
R210
10.0k
R209
10.0k
R212
10.0k
R211
10.0k
C206 27p
C205
27p
R213
5.6k
R214
5.6k
R215
5.6k
R216
5.6k
VR201A
B20k
VR201B
B20k
VR201D
B20k
VR201C
B20k
5
6
4
SW202B
10
11
12
SW202D
Right/Mono/Mic
Left
Channel 2
Mic/Line
Mic/Line
Level
Level
Pan
In-Mic
In-Mic
5
6
4
SW201B
10
11
12
SW201D
In
In
Channel 2 Mute
In = Channel On
C207
.1U
C208
.1U
-18
+18
RPeak
6
5
4
3
2
1
J201
EUROBLOCK 6
2
3
1
SW204A
SW DPDT
5
6
4
SW204B
SW DPDT
-18
+18
LPeak
RBus
LBus
C201
47U
C202
47U
R201
3.3K
R202
3.3K
12
13
14
U2D
TLE2064
R219
390K
R218
100K
R217
100K
Stereo/Mono
Phantom Pwr
Ducker Detector
(0 dBu Threshold)
Stereo = Out Stereo = Out
CH2 Detect Enable
Ducker Enable
+18SW1
+18SW1
1
2
3
J6
VREF
5
6
7
U13B
NJM2903
Q7
2N4123
+18
R75
100K
Q6
2N4125
Q5
2N4125
R81
18K
-18
D8
1N4148
R72
10K
CH2 Mute
+18
VREF
3
2
1
11 4
U2A
TLE2064
3
2
1
84
U17A
NJM2903
C43
47U
R78
33K
R80
1M
D7
1N4148
C34
.1U
VREF
1
3
2
Q3
J110
1
3
2
Q4
J110
CH2 Mute
CH2 Mute
/ATTN
/ATTN
D22
1N5818
-18
+18
J7
J12
(-30 dBu Line)
C110
47U
C109
47U
C210
47U
C209
47U
C8
27P
Ducking Level
-90dB -20dB
C7
27P
C1
None
C2
None
C20
.1U
1
2
3
J16
J13
+18
(-60 dBu Mic)
13
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1 2 3 4 5 6 78
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size
Drawn B
y
Rev.
D
10S8210-3.sch
10s8210
DLM-821
(
Channels 5-8
)
James B Franks
Sheet # of
36
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
(716) 872-0010
(716) 872-0739
Print Date
22-Jan-2004
11:47:28
A->B @ 157%
C
R503
10.0k
R504
10.0k
R506
10.0k
R507
10.0k
C504 27p
C503
27p
3
2
1
8 4
U501A
4560
5
6
7
U501B
4560
D503
1N4148
D504
1N4148
R510
10.0k
R509
10.0k
R512
10.0k
R511
10.0k
C506 27p
C505
27p
R513
5.6k
R514
5.6k
R515
5.6k
R516
5.6k
VR501A
B20k
VR501B
B20k
VR501D
B20k
VR501C
B20k
Right
Left
Channel 5
Level
Level
Pan
5
6
4
SW501B
10
11
12
SW501D
In
In
Channel 5 Mute
In = Channel On
1
2
3
7
8
9
4
5
6
10
11
12
AB
DC
4PDT Switch
A
B
D
C
Four-Ganged Pot
CW
R603
10.0k
R604
10.0k
R606
10.0k
R607
10.0k
C604 27p
C603
27p
3
2
1
8 4
U601A
4560
5
6
7
U601B
4560
D603
1N4148
D604
1N4148
R610
10.0k
R609
10.0k
R612
10.0k
R611
10.0k
C606 27p
C605
27p
R613
5.6k
R614
5.6k
R615
5.6k
R616
5.6k
VR601A
B20k
VR601B
B20k
VR601D
B20k
VR601C
B20k
Right
Left
Channel 6
Level
Level
Pan
5
6
4
SW601B
10
11
12
SW601D
In
In
Channel 6 Mute
In = Channel On
6
5
4
3
2
1
J501
EUROBLOCK 6
6
5
4
3
2
1
J601
EUROBLOCK 6
RPeak
RDuckBus
LDuckBus
LPeak
LDuckBus
RDuckBus
LPeak
RPeak
-18
+18
-18
+18
R403
1.15K
R404
1.15K
R406
39.2K
R407
39.2K
C404 27p
C403
27p
3
2
1
8 4
U401A
2043
5
6
7
U401B
2043
D403
1N4148
D404
1N4148
R410
10.0k
R409
10.0k
R412
10.0k
R411
10.0k
C406 27p
C405
27p
R413
5.6k
R414
5.6k
R415
5.6k
R416
5.6k
VR401A
B20k
VR401B
B20k
VR401D
B20k
VR401C
B20k
Left
Level
Level
Pan
5
6
4
SW401B
10
11
12
SW401D
In
In
Channel 4 Mute
In = Channel On
R303
1.15K
R304
1.15K
R306
39.2K
R307
39.2K
C304 27p
C303
27p
3
2
1
8 4
U301A
2043
5
6
7
U301B
2043
D303
1N4148
D304
1N4148
R310
10.0k
R309
10.0k
R312
10.0k
R311
10.0k
C306 27p
C305
27p
R313
5.6k
R314
5.6k
R315
5.6k
R316
5.6k
VR301A
B20k
VR301B
B20k
VR301D
B20k
VR301C
B20k
Left
Level
Level
Pan
5
6
4
SW301B
10
11
12
SW301D
In
In
Channel 3 Mute
In = Channel On
6
5
4
3
2
1
J301
EUROBLOCK 6
6
5
4
3
2
1
J401
EUROBLOCK 6
RPeak
RDuckBus
LDuckBus
LPeak LPeak
LDuckBus
RDuckBus
RPeak
+18
-18-18
+18
5
6
4
SW302B
Mic/Line
In-Mic
2
3
1
SW304A
SW DPDT
5
6
4
SW304B
SW DPDT
Stereo/Mono
Stereo = Out
5
6
4
SW402B
Mic/Line
In-Mic
2
3
1
SW404A
SW DPDT
5
6
4
SW404B
SW DPDT
Stereo/Mono
Stereo = Out
R305
1.15K
R405
1.15K
Ri
g
ht/Mono/Mic
Channel 3
2
3
1
SW303A
SW DPDT
5
6
4
C301
47U
C302
47U
R301
3.3K
R302
3.3K
+18
Phantom Pwr
+18SW2
Ri
g
ht/Mono/Mic
Channel 4
C401
47U
C402
47U
R401
3.3K
R402
3.3K
Phantom Pwr
+18SW2
R408
1.15k
10
11
12
SW402D
Mic/Line
In-Mic
R308
1.15k
10
11
12
SW302D
Mic/Line
In-Mic
C307
.1U
C308
.1U
-18
+18
C407
.1U
C408
.1U
-18
+18
C509
47U
C510
47U
C610
47U
C609
47U
C409
47U
C410
47U
C309
47U
C310
47U
14
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1 2 3 4 5 6 78
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size
Drawn B
y
Rev.
D
10s8210-4.Sch
10S8210
DLM-821
(
CH 7 & 8 + Power Su
pp
l
y)
James B Franks
Sheet # of
46
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
(716) 872-0010
(716) 872-0739
Print Date
22-Jan-2004
11:45:37
A->B @ 157%
C
out
SW6
D9
1N4004
D19
1N4004
D10
1N4004
D20
1N4004
C38
1000U
C39
1000U
D35
1N4004
D36 1N4004
C3
1.5U
C4
1.5U
D24
1N4004
D21
1N4004
-18
C33
.1U
R79
1.5K
+18
H2
AC-GND
GND
HS2
HS1
AC
AC-SW
ACN
L
G
N
J3
AC-INLET
H1
out
SW5
120 240
Power
120/240 Select
2 11
3 10
4
5
8
T1
P85D07308
In
1
2
Out
3
U14
7818
In
2
1
Out
3
U15
7918
F1
3AG ½ AMP AGC
H3 H4 H5
1
2
3
7
8
9
4
5
6
10
11
12
AB
DC
4PDT Switch
A
B
D
C
Four-Ganged Pot
CW
R703
10.0k
R704
10.0k
R706
10.0k
R707
10.0k
C704 27p
C703
27p
3
2
1
8 4
U701A
4560
5
6
7
U701B
4560
D703
1N4148
D704
1N4148
R710
10.0k
R709
10.0k
R712
10.0k
R711
10.0k
C706 27p
C705
27p
R713
5.6k
R714
5.6k
R715
5.6k
R716
5.6k
VR701A
B20k
VR701B
B20k
VR701D
B20k
VR701C
B20k
Right
Left
Channel 7
Level
Level
Pan
5
6
4
SW701B
10
11
12
SW701D
In
In
Channel 7 Mute
In = Channel On
R803
10.0k
R804
10.0k
R806
10.0k
R807
10.0k
C804 27p
C803
27p
3
2
1
8 4
U801A
4560
5
6
7
U801B
4560
D803
1N4148
D804
1N4148
R810
10.0k
R809
10.0k
R812
10.0k
R811
10.0k
C806 27p
C805
27p
R813
5.6k
R814
5.6k
R815
5.6k
R816
5.6k
VR801A
B20k
VR801B
B20k
VR801D
B20k
VR801C
B20k
Right
Left
Channel 8
Level
Level
Pan
5
6
4
SW801B
10
11
12
SW801D
In
In
Channel 8 Mute
In = Channel On
6
5
4
3
2
1
J701
EUROBLOCK 6
6
5
4
3
2
1
J801
EUROBLOCK 6
RPeak
RDuckBus
LDuckBus
LPeakLPeak
LDuckBus
RDuckBus
RPeak
-18
+18
-18
+18
H6
C709
47U
C710
47U
C810
47U
C809
47U
15
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1 2 3 4 5 6 78
A
B
C
D
E
8
7654321
E
D
C
B
A
B
APPROVED: Dw
g
#
Size
Drawn B
y
Rev.
D
10s8210-5.sch
10S8210
DLM-821
(
Indicators and Meters
)
James B Franks
Sheet # of
56
847 Holt Road
Webster, NY 14580-9103
Phone: Fax:
(716) 872-0010
(716) 872-0739
Print Date
22-Jan-2004
11:45:00
A->B @ 157%
C
5
6
7
U16B
4560
5
6
7
U902B
4560
3
2
1
84
U902A
4560
D909
1N4148
D908
1N4148
D907
1N4148
R901
4.7K
R907
4.7K
R908
4.7K
R909
4.7K
R910
4.7K
R911
4.7K
R905
3.3K
R902
300k
R903
10k
R904
12k
R906
10M
R920
68k
R919
1k
R918
33k
R917
2k
R916
1k
R915
560
R914
100
R913
220
R912
220
D906
R
D905
Y
D904
Y
D903
G
D902
G
D901
G
C901
.01U
C902
1.5U
1
2
3
4
5
J901
+18+18
+18
-18
-18
From 10P3801 Motherboard
Left Meter Card
Clip
+6VU
0VU
-6VU
-12VU
-20VU
3
2
1
8 4
U16A
4560
5
6
7
U952B
4560
3
2
1
84
U952A
4560
D959
1N4148
D958
1N4148
D957
1N4148
R951
4.7K
R957
4.7K
R958
4.7K
R959
4.7K
R960
4.7K
R961
4.7K
R955
3.3K
R952
300k
R953
10k
R954
12k
R956
10m
R970
68k
R969
1k
R968
33k
R967
2k
R966
1k
R965
560
R964
100
R963
220
R962
220
D956
R
D955
Y
D954
Y
D953
G
D952
G
D951
G
C951
.01U
C952
1.5U
1
2
3
4
5
J951
+18+18
+18
-18
-18
From 10P3801 Motherboard
Ri
g
ht Meter Card
Clip
+6VU
0VU
-6VU
-12VU
-20VU
D102
Y
D101
G
D202
Y
D201
G
D301
G
R41
2k
R42
2k
2
3
1
SW102A
All Switches Shown In Out Position
2
3
1
SW101A
2
3
1
SW202A
2
3
1
SW201A
2
3
1
SW301A
D401
G
D501
G
D601
G
D701
G
D801
G
R43
2k
R44
2k
2
3
1
SW401A
2
3
1
SW501A
2
3
1
SW601A
2
3
1
SW701A
2
3
1
SW801A
Ch. 8
Mute
Ch. 7
Mute
Ch. 6
Mute
Ch. 5
Mute
Ch. 4
Mute
Ch. 3
Mute
Ch. 2
Mute
Ch. 2
Mic/Line
Ch. 1
Mute
Ch. 1
Mic/Line
+18+18 -18-18
Ch. 1-8 Mute Switch Indicators/
Ch. 1-4 Mic-Line Switch Indicators
D2
R
2
3
1
SW2A
Output
Mute
1
2
3
7
8
9
4
5
6
10
11
12
AB
DC
4PDT Switch
+18
-18-18
+18
1
2
3
4
5
J10
1
2
3
4
5
J11
+18
+18
-18
-18
RPeak
RMeter
LPeak
LMeter
H9
BRACKET 4-40
H10
BRACKET 4-40
+18
-18
+18
-18
-18
+18
D302
Y
2
3
1
SW302A
Ch. 3
Mic/Line
Ch. 4
Mic/Line
D402
Y
2
3
1
SW402A
3
2
1
84
U901A
4560
5
6
7
U901B
4560
3
2
1
84
U903A
4560
5
6
7
U903B
4560
5
6
7
U953B
4560
5
6
7
U951B
4560
3
2
1
84
U953A
4560
3
2
1
84
U951A
4560
-18
+18 +18
-18
D5
G
Power
Printed in USA 3-04 DLM-00
ASHLY AUDIO INC. 847 Holt Road Webster, NY 14580-9103
Phone: (585) 872-0010 Fax: (585) 872-0739
Toll Free (800) 828-6308
www.ashly.com
© 2004 by Ashly Audio Corporation. All rights reserved worldwide.
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
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