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
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
2
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
1. INTRODUCTION
Congratulations on your purchase of an Ashly
DLM-821 stereo ducking 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 switching 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 priority whereby a signal on ch. 1 has priority over the signal
on ch. 2 and fully attenuates channels 2 through 8. Furthermore, 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
Ashly product is carefully inspected before leaving the
factory to ensure flawless appearance. After unpacking,
please inspect for any physical damage. Save the shipping carton and all packing materials , as they were carefully designed to reduce to minimum
transportation damage should the unit again require packing 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 available for inspection by the carrier. Save all packing materials 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 receptacles. To reduce the risk of ground loop hum, use a central point for system AC power distribution. The AC line
fuse is internal, and should only be changed by a qualified service technician.
our system of quality control, every
the possibility of
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. Installation is simple and does not require removal of the
equipment from your rack. See your Ashly dealer for
details.
3
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 channel completely off allowing the channel level to remain
at its desired setting when the input is not needed.
5.4 Mic/Line Switch
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 output (0 VU = +4dBu). The red clipping LED's also monitor 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 operating level for the entire mixer. The "5" position corresponds to unity gain. This control does not effect the
mono output level.
5.7 Stereo Output Mute
This switch entirely mutes the main stereo output. The headphone and mono output are not affected.
This is particularly useful when the DLM-821 is used as
a sub-mixer.
This recessed switch on the first four inputs increases 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.
4
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.
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 position) 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 position, 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 independently. (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)
5
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 balanced impedance with a single-ended signal source and can be wired balanced or unbalanced. 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 minimize 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.
G
-
+
G
-
+
Euroblock
Input
Connections
G
-
+
G
-
+
Euroblock
Output
Connections
G
-
+
Unbalanced
Input
G
-
+
Balanced
Input
G
+
Unbalanced
Output
G
-
+
Balanced
Output
6
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 instrumental 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 crossovers which may be used) is fed from the MAIN OUTPUT connectors.
Left and Right
Speakers
Stereo
Power Amplifier
Cassette Tape
DVD/CD Player
Midi Sound Module
Stereo Keyboard Input
On Ch. 3
Microphone
Inputs
On Ch. 1 and 2
(Mono Switch In)
Stereo Drum Machine
Inputs On Ch. 4
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.
Left and Right
Speakers
Stereo
Power Amplifier
Mono Output to
Wall Mic Input
for Secondary PA
(Set Mono Output
to Mic level)
Microphone
Inputs
On Ch. 2 - 4
(Mono Switch In)
Here the Mono Output selector
switch should be pushed in
for a mic-level signal.
Alarm or
Priority Override
Audio Source
(Mono Switched In)
Laptop Audio
DVD/CD Player
Videotape Audio
7
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.
Stereo Speakers
Emergency
Page
(Priority
Ducking)
Stereo
Power Amplif ier
Outdoor
Loudspeaker
Output
Satellite TV Audio
Talent Mics
On Ch. 2 - 4
(Mono Switch In)
Satellite Background Music
Host Mic
(Ducking)
Tape
DVD/CD Player
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 controls. 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 probably 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 everything 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.
8
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
9. DIMENSIONS
6.00
(152)
0.10
(2.5)
1.15
(32)
(44) (29)
1.25
1.75
17.00
(432)
19.00 (483)
18.375 (467)
!"#$%&'+
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
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 VAC available)
*unless otherwise stated, specification conditions are: 150
ohm source, all levels set at nominal, outputs into 2.7k
ohm or greater.
9
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 establish 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 ____________________________________
10
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
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Rev.
11:47:56
(716) 872-0739
Print Date
$VKO\ $XGLR ,QF
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847 Holt Road
Webster, NY 14580-9103
(716) 872-0010
Phone: Fax:
Drawn B
James B Franks
A->B @ 157%
16
Sheet # of
Size
C41
.1U
R3
4.7K
-18
1N4148
RPeak
C21
.1U
4.7K
-18
LPeak
+18
.1U
A
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22-Jan-2004
10S8210
#
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Out
10s8210-1.Sch
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DLM-821
APPROVED: Dw
1 2 3 4 5 6 78
1N4148
1N4148
+18
5
Enable
J15
J8
84
J14
J2
LPeak RPeak
7
U10B
123
R64
3
Enable
4560
6
HDRM 1X3
R66
0
1
4560
U10A
2
R34
123
HDRM 1X3
B
RBus
C37
+18
R65
None
R63
0
C9
10P
R19
33K
C26
+18
None
-18
C42
C22
10P
-18
33K
B
2180LC
.1U
+
-
5 7
6
2
3
U11
4
1 8
R47
33K
D1
7
2043
U1B
5
6
RDuckBus
LBus
2180LC
.1U
3
.1U
+
U12
1 8
R55
1
U1A
2
LDuckBus
R18
-
5 7
6
2
4
33K
D3
1N4148
2043
8 4
3
C40
Left Output Mute
D11
1N4148
LPeak
C
(Shown Out)
J4
321
Mono Output
5
SW1A
423
1
Mic/Line
(Line = Out)
R20
C25
68p
R49
C32
R4
R28
EUROBLOCK 3
R21
100
6
(Shown Out)
R2
100
100
R50
10k
D18
47U
7
D17
4560
10k
U6B
5
6
1k
B10k
Mono Level
VR1C
R13
4.7k
C24
47U
1
15k
4560
U6A
8 4
-18
3
2
22k
22k
R37
R38
LSum
RSum
Right Ducking VCA
8
7654321
12. DLM-821 SCHEMATIC DIAGRAMS
E
ht Output
Ri
R17
100
789
ht Output Mute
(Shown Out)
SW2C
Ri
D
J5
65432
1
EUROBLOCK 6
R14
100
R15
100
SlimJack
J9
Headphone Output
R5
VR1B
1N4148
R7
R11
C100K
RPeak
68k
4.7k
VR2A
B20K
68
7
2043
U5B
5
6
68k
R8
LMeter
R29
100k
C5
1.5U
15k
none
C14
R26
(+0.4dB At Center)
C16
SW2D
101112
47U
7
6
R22
Left Output
R16
100
4560
U3B
5
5.6k
R6
68
1
68k
2043
C11
R9
-18
10pf
R12
4.7k
VR1A
C100K
68k
R10
RMeter
R30
C6
1.5U
none
C15
C10 10pf
8 4
U5A
+18
3
2
100k
C18
47U
D13
7
15k
4560
U4B
R27
5
6
R24
5.6k
Pan
R23
R25
5.6k
D14
1N4148
B20K
VR2B
RPeak
1
22k
4560
U4A
C29 27p
R32
RSum
C13
10pf
+18
-18
.1U
C35
.1U
C36
8 4
-18
3
2
2k
R40
VR2C
B20K
C19
33k
R52
6
RBus
R46
10k
7
U7B
5
+18
Master Level
(+3dB Mid, +18dB Max)
47U
D16
1N4148
RPeak
2043
C28 27p
LSum
C12
RPeakBus
LPeakBus
RBus
Channels 3-6
E
10S8210-3.sch
LBus
CH 7 & 8 + Power Supply
10S8210-4.sch
RMeter
RPeakBus
LMeter
LPeakBus
Meter Cards and Indicators
10s8210-5.Sch
Revision Sheet
10s8210RV.sch
D
RPeakBus
LPeakBus
RBus
LBus
Channels 1-2
10S8210-2.sch
5.6k
D12
1N4148
LPeak
1
22k
4560
U3A
R31
10pf
8 4
-18
R39
R51
+18
3
2
2k
VR2D
B20K
R45
10k
C17
47U
D15
1N4148
LPeak
1
33k
2043
U7A
8 4
-18
+18
3
2
LBus
C
Left Ducking VCA
C23
.1U
R35
2.7K
R33
47K
VCA-DC
+18
11
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
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E
D
C
B
DC
456
10
11
Ducker Enable
5mA Typ.
Q1
2N4125
R76
470K
84
+18
3
D4
27P
C27
12
9
4PDT Switch
VCA-DC
5
2
SW DPDT
SW3A
6
4
3
1
C31
47U
Q2
2N4123
R77
10M
/ATTN
1
NJM2903
U13A
2
1N4148
7
TLE2064
U2B
5
6
47U
R59
1K
CH1 Det
12378
AB
D6
1N746A
J13
+18
3
R75
100K
2
1
J16
-90dB -20dB
Ducking Level
Q6
2N4125
+18
Q5
2N4125
(0 dBu Threshold)
R61
560
R1
1M
C30
.1U
(-30 dBu Line)
(-60 dBu Mic)
Q7
2N4123
CH2 Mute
R72
CW
A
BDC
R62
/ATTN
R36
Ducker Detector
VREF
R74
+18 +18
R73
33K
1K
33K
18K
C8
84
+18
-18
5
SW201B
In
6
4
Channel 2 Mute
In = Channel On
VR201D
47U
C206 27p
6
4
In-Mic
Mic/Line
5
SW202B
65432
J201
5
SW101B
In
6
4
Channel 1 Mute
In = Channel On
VR101D
47U
C106 27p
789
In-Mic
Mic/Line
SW102C
65432
J101
/ATTN
.1U
1M
CH2 Mute
Pan
VR201B
R209
5
SW204B
4
Pan
VR101B
R109
5
SW104B
4
Q3
VR201A
B20k
C210
2
10.0k
SW DPDT
VR101A
B20k
C110
2
10.0k
SW DPDT
J110
1
3
1
3
B20k
U201A
B20k
U101A
VR201C
47U
2043
3
2
SW204A
1
VR101C
47U
2043
3
2
SW104A
1
6
R216
R215
B20k
D204
8 4
R210
10.0k
SW DPDT
R116
R115
B20k
D104
8 4
R110
10.0k
SW DPDT
7
U17B
5
LBus
5.6k
Q4
132
101112
5.6k
1N4148
+18
27p
C205
R211
10.0k
Left
Stereo/Mono
LBus
5.6k
101112
5.6k
1N4148
+18
27p
C105
R111
10.0k
Left
Stereo/Mono
NJM2903
CH2 Mute
J110
In
SW201D
Level
LPeak
In
SW101D
Level
LPeak
Stereo = Out Stereo = Out
Four-Ganged Pot
1
NJM2903
U17A
3
2
C34
VREF
R80
RBus
5.6k
R214
132
R213
5.6k
B20k
Level
10.0k
-18
R212
6
1
RBus
5.6k
R114
R113
5.6k
B20k
Level
10.0k
-18
R112
6
1
8
+18
7654321
RPeak
D203
In-Mic
Mic/Line
Phantom Pwr
Channel 2
+18
C1
RPeak
D103
In-Mic
Mic/Line
+18
+18SW1
Phantom Pwr
Channel 1
-18
.1U
C207
.1U
C208
27P
C7
R78
33K
+18
2
C43
R60
3
2
J7
1
J1
CH2 Detect Enable
14
C2
None
R219
390K
13
1N4148
SW202D
7
39.2k
U201B
101112
C204 27p
R207
5
6
R208
1.15k
R203
1.15k
C202
C201
+18SW1
47U
R202
3.3K
R201
3.3K
Right/Mono/Mic
-18
.1U
C107
.1U
C108
8
None
R119
390K
9
1N4148
SW102D
7
39.2k
U101B
101112
C104 27p
R107
5
6
R108
1.15k
R103
1.15k
3
1
6
4
C102
2
5
C101
SW DPDT
R102
R101
47U
3.3K
3.3K
SW103A
Right/Mono/Mic
D7
1
U2A
1K
U2D
12
2043
R204
CH1 Det
U2C
10
2043
R104
1N4148
TLE2064
11 4
3
47U
TLE2064
R218
100K
R217
100K
27p
C203
R205
1.15k
1.15k
47U
EUROBLOCK 6
TLE2064
R118
100K
R117
100K
27p
C103
R105
1.15k
1.15k
47U
EUROBLOCK 6
C209
39.2k
R206
C109
39.2k
R106
A
Rev.
11:44:12
(716) 872-0739
Print Date
$VKO\ $XGLR ,QF
C
847 Holt Road
Webster, NY 14580-9103
(716) 872-0010
Phone: Fax:
Drawn B
26
Sheet # of
Size
D22
1N5818
18K
1N4148
5
VREF
C20
-18
1
2
3
J6
7
NJM2903
U13B
6
R81
D8
10K
D
22-Jan-2004
10s8210
#
James B Franks
A->B @ 157%
Channels 1-2
10S8210-2.sch
B
DLM-821
APPROVED: Dw
.1U
J12
&+ 3ULRULW\ (QDEOHG
1 2 3 4 5 6 78
E
D
C
B
A
12
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
g
y
(
)
g
g
E
8
D
C
B
DC
456
10
11
CW
A
BDC
Four-Ganged Pot
7654321
12
9
4PDT Switch
12378
AB
A
D
Rev.
11:47:28
(716) 872-0739
Print Date
22-Jan-2004
$VKO\ $XGLR ,QF
C
847 Holt Road
Webster, NY 14580-9103
(716) 872-0010
Phone: Fax:
Drawn B
James B Franks
A->B @ 157%
10s8210
#
Channels 5-8
36
10S8210-3.sch
Sheet # of
B
DLM-821
Size
APPROVED: Dw
+18
C407
SW402D
In-Mic
101112
R408
1.15k
Mic/Line
+18SW2
Phantom Pwr
VR401B
6
VR401A
B20k
R409
5
SW404B
4
B20k
VR401C
C410
7
6
10.0k
SW DPDT
3
B20k
U401B
5
2
SW404A
R416
R415
47U
2043
R410
1
10.0k
SW DPDT
LDuckBus
5.6k
101112
5.6k
Level
D404
1N4148
C405
R411
10.0k
Left
In
SW401D
27p
Stereo = Out
Stereo/Mono
RDuckBus
5.6k
5
R614
SW601B
In
6
4
Channel 6 Mute
In = Channel On
RPeak
D603
1N4148
1
4560
10.0k
8 4
U601A
-18
C604 27p
R607
+18
3
2
R604
10.0k
R603
10.0k
R613
5.6k
VR601D
B20k
C609
47U
27p
C603
R606
10.0k
Level
10.0k
C606 27p
R612
Right
Pan
R609
B20k
VR601B
C610
6
10.0k
VR601A
7
U601B
LDuckBus
R616
5.6k
B20k
5
VR601C
47U
4560
R610
In
101112
SW601D
R615
5.6k
B20k
Level
D604
1N4148
LPeak
27p
C605
10.0k
R611
10.0k
Left
RDuckBus
-18
.1U
.1U
C408
Channel 4 Mute
RPeak
D403
C409
1N4148
1
2043
39.2K
8 4
U401A
-18-18
C404 27p
R407
R402
R401
3.3K
+18
3
2
C403
R405
1.15K
R403
1.15K
R404
1.15K
C402
47U
C401
47U
3.3K
5
R414
SW401B
In
6
4
In = Channel On
R413
VR401D
B20k
47U
27p
39.2K
R406
6
4
In-Mic
Mic/Line
5
SW402B
5.6k
Pan
5.6k
Level
10.0k
C406 27p
R412
65432
65432
ht/Mono/Mic
Channel 4
Ri
.1U
C307
.1U
C308
SW302D
39.2K
101112
C304 27p
R307
R308
1.15k
3
1
6
4
2
5
SW303A
SW DPDT
R302
3.3K
R301
3.3K
ht/Mono/Mic
Ri
E
-18
RPeak
D303
1N4148
1
2043
8 4
U301A
3
2
C303
R305
R303
1.15K
R304
C302
47U
C301
47U
+18
In-Mic
Mic/Line
+18
+18SW2
Phantom Pwr
Channel 3
J401
Channel 3 Mute
C309
47U
+18
27p
39.2K
R306
4
1.15K
1.15K
SW302B
65432
J301
1
5
SW301B
In
6
4
In = Channel On
R313
VR301D
B20k
C306 27p
6
In-Mic
Mic/Line
5
1
EUROBLOCK 6
EUROBLOCK 6
RDuckBus
5.6k
R314
5.6k
Level
10.0k
R312
6
Pan
VR301B
R309
5
SW304B
4
D
VR301A
B20k
C310
7
6
10.0k
SW DPDT
3
B20k
U301B
VR301C
47U
2043
5
2
SW304A
1
R316
R315
B20k
R310
10.0k
SW DPDT
D304
C305
LDuckBus
5.6k
101112
SW301D
5.6k
Level
1N4148
LPeak LPeak
27p
R311
10.0k
Left
Stereo = Out
Stereo/Mono
Channel 6
In
RPeak
D503
1N4148
1
4560
10.0k
8 4
U501A
-18
C504 27p
R507
3
2
R504
R503
10.0k
Right
Channel 5
C
J601
Channel 5 Mute
C509
+18
C503
R506
10.0k
10.0k
J501
1
5
SW501B
In
6
4
In = Channel On
R513
VR501D
B20k
47U
27p
C506 27p
65432
1
EUROBLOCK 6
RDuckBus
5.6k
R514
Pan
5.6k
Level
10.0k
R512
EUROBLOCK 6
R509
VR501B
C510
6
10.0k
VR501A
B20k
7
U501B
B
LDuckBus
R516
5.6k
B20k
5
VR501C
B20k
47U
4560
R510
10.0k
In
101112
SW501D
R515
5.6k
Level
D504
1N4148
LPeak
27p
C505
10.0k
R511
Left
1 2 3 4 5 6 78
A
13
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
g
y
(
pp
y)
B
GND
D24
1N4004
C3
1.5UC41.5U
U14
2
C38
1000U
1N4004
-18
3
Out
U15
1
7918
In
D36 1N4004
2
HS1
C39
1000U
D21
+18
3
Out
7818
In
1
HS2
456
12378
SW801D
LPeakLPeak
C
In
1N4004
D35
SW801B
In
6
Channel 8 Mute
In = Channel On
C809
47U
+18
27p
10.0k
R806
65432
J801
5
D
4
VR801D
B20k
C806 27p
R813
12
9
4PDT Switch
RDuckBus
5.6k
R814
5.6k
Level
10.0k
R812
1
EUROBLOCK 6
DC
10
11
AB
LDuckBus
R816
5.6k
VR801A
B20k
Pan
VR801B
R809
101112
B20k
R815
5.6k
VR801C
B20k
Level
C810
47U
D804
1N4148
7
4560
U801B
5
6
27p
C805
10.0k
R811
R810
10.0k
10.0k
Left
E
8
CW
A
BDC
Four-Ganged Pot
7654321
RPeak
D803
1N4148
1
4560
10.0k
8 4
U801A
-18
C804 27p
R807
3
2
C803
R804
R803
10.0k
10.0k
Right
Channel 8
A
D
Rev.
11:45:37
(716) 872-0739
Print Date
22-Jan-2004
$VKO\ $XGLR ,QF
C
847 Holt Road
Webster, NY 14580-9103
(716) 872-0010
Phone: Fax:
Drawn B
James B Franks
A->B @ 157%
46
10s8210-4.Sch
Sheet # of
B
Size
10S8210
l
#
CH 7 & 8 + Power Su
DLM-821
APPROVED: Dw
C704 27p
Channel 7
E
Pan
VR701B
R709
10.0k
VR701A
B20k
C710
6
7
B20k
U701B
5
VR701C
47U
4560
R710
R716
R715
B20k
10.0k
Left
LDuckBus
D704
1N4148
C705
R711
5.6k
5.6k
27p
10.0k
101112
Level
SW701D
D19
1N4004
D20
1N4004
In
C
D9
T1
2 11
AC-SW
1N4004
D10
C33
.1U
3 1045
SW6
120/240 Select
SW5
Power
F1
3AG ½ AMP AGC
AC
LGN
J3
B
1N4004
R79
1.5K
8
P85D07308
out
120 240
out
H1
ACN
AC-INLET
AC-GND
H6
H3 H4 H5
H2
1 2 3 4 5 6 78
A
RDuckBus
5.6k
5
R714
SW701B
In
6
4
Channel 7 Mute
In = Channel On
RPeak
D703
1N4148
1
4560
10.0k
8 4
U701A
-18
R707
3
2
R704
R703
10.0k
10.0k
R713
5.6k
VR701D
B20k
C709
47U
Level
+18
27p
C703
R706
10.0k
10.0k
C706 27p
R712
Right
65432
1
J701
EUROBLOCK 6
D
14
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
g
y
(
)
g
B
8 4
+18
Mute
Mute
Mute
Mute
Mute
Mute
3
SW2A
3
SW801A
3
SW701A
3
SW601A
3
SW501A
3
SW401A
+18+18 -18-18
R43
2k
D5
G
Power
1
D2
R
2
1
D801
G
2
1
D701
G
2
1
D601
G
2
1
D501
G
2
1
D401
G
2
R44
2k
4560
-18-18
Output
220
Ch. 8
Ch. 7
Ch. 6
Ch. 5
Ch. 4
6
7
7
U16B
RMeter
U951B
6
5
D952
4560
J11
12345
+18
4560
-12VU
G
R965
-18
560
C
LPeak
R969
R970
R960
4.7K
84
C952
1.5U
1k
D957
1N4148
D958
68k
1
U953A
3
2
1
4560
1N4148
U16A
-18
3
2
LMeter
-20VU
G
R961
D951
4.7K
4560
1
84
U951A
-18
+18
3
2
R963
R964
100
220
R962
4.7K
1
84
U952A
3
2
R968
BRACKET 4-40
D
J10
12345
+18
RPeak
-18
C902
1.5U
R919
1k
D907
1N4148
D908
1N4148
R920
68k
0VU
Y
D954
4560
-18
2k
R967
33k
-18
-6VU
G
7
U953B
R959
D953
4.7K
4560
6
5
R966
1k
R958
4.7K
5
E
8
7654321
+18+18
D959
1N4148
D956
R
Clip
R951
4.7K
R952
300k
12k
R954
R953
10k
-18
+18
ht Meter Card
J951
From 10P3801 Motherboard
Ri
12345
+6VU
Y
D955
7
U952B
5
R955
R957
4560
+18
6
C951
.01U
R956
10m
3.3K
H10
A
D
Rev.
11:45:00
(716) 872-0739
Print Date
22-Jan-2004
$VKO\ $XGLR ,QF
C
847 Holt Road
Webster, NY 14580-9103
(716) 872-0010
Phone: Fax:
Drawn B
James B Franks
A->B @ 157%
56
10s8210-5.sch
Sheet # of
B
Size
10S8210
#
Indicators and Meters
DLM-821
APPROVED: Dw
+18+18
D909
1N4148
D906
R
Clip
+6VU
R901
4.7K
R902
300k
12k
R904
R903
10k
-18
+18
12345
J901
From 10P3801 Motherboard
Left Meter Card
Y
D905
7
4560
U902B
5
+18
6
C901
.01U
R906
10M
R905
3.3K
H9
BRACKET 4-40
R907
4.7K
84
0VU
Y
D904
1
4560
U902A
-18
3
2
2k
R917
R918
33k
-18
-6VU
G
R908
D903
4.7K
7
4560
U903B
5
6
R916
1k
-12VU
G
R909
D902
4.7K
7
4560
U901B
+18 +18
5
6
R915
560
R910
4.7K
84
-20VU
G
R911
D901
4.7K
1
4560
U903A
3
2
1
84
U901A
-18
+18
3
2
R913
R914
100
220
R912
DC
456
10
11
12
9
4PDT Switch
12378
AB
E
D
C
Ch. 4
Mic/Line
Ch. 3
4560
220
Mic/Line
Ch. 3
Mute
Ch. 2
Mute
Ch. 2
Mic/Line
Ch. 1
Mute
Ch. 1
Mic/Line
Ch. 1-8 Mute Switch Indicators/
Ch. 1-4 Mic-Line Switch Indicators
B
3
SW402A
3
SW302A
3
SW301A
3
SW201A
3
SW202A
3
SW101A
3
SW102A
R41
2k
1
D402
Y
2
1
2
1
2
1
2
1
2
1
2
1
2
All Switches Shown In Out Position
D302
Y
D301
G
D201
G
D202
Y
D101
G
D102
Y
R42
2k
1 2 3 4 5 6 78
A
15
Operating Manual - DLM-821 Stereo Ducking Line/Microphone Mixer
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.
Printed in USA 3-04 DLM-00
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