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The AS100D provides two separate preamps to
capture the best sound out of your acoustic instrument.
Having two channels dedicated to acoustic instruments
allows you to mix two types of commonly used pick
up (Piezo, magnetic or microphone), between either
two mono jacks or a stereo jack.
Channel 1 - Acoustic Instrument
1. Input Jack
This input will accept a normal mono jack lead
from a piezo transducer or magnetic pick-up.
Plug the lead from your guitar in here to connect
you to channel 1.
This is also a stereo input designed speciality for
those acoustic instruments which feature a variety
of pickups (e.g. magnetic and transducer) fed
through a single stereo cable. In this mode the
signal from the ring of the stereo jack is
automatically routed through to channel 2 by
selecting the Link Ch 1 switch (item 17). This
allows separate preamp control for the two
different pick ups.
2. Phase Switch
Reverses the phase of the signal to cut out
unwanted resonances caused by the instrument
and speakers being in phase.
Ensure that you test this in the position where you
will actually perform.
3. Gain Switch
Increases the amount of gain to the input and is
extremely useful for boosting the signal of pickups
with very low output levels.
4. Volume Control
Adjusts the volume level of channel 1.
5. Bass Control
Adjusts the amount of bottom end or bass in your
sound. Too much bass can cause unwanted feed
back, therefore care should be taken when setting
this control. The best position to start is 12
o’clock, then adjust from there as desired.
6. Parametric Mid Control
Cuts or boosts the mid-range of your sound. This
control works in conjunction with item 7 (mid
frequency control) to give the maximum possible
control over the all important mid -range of your
instrument’s tonal spectrum.
7. Mid Frequency Control
Adjusts the frequency of the mid range control
(item 6).
8. Treble Control
Adjusts the high end or treble frequencies in your
tone. Again, care should be taken when setting
this control as too much treble will cause high
pitched feedback. The starting point of the 12
o’clock position is best.
AS100D Front Panel Features
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Introduction
The AS100D is a comprehensively featured 100 watt combo amplifier, specially designed for use
with a variety of acoustic instruments. Between its four channels, this combo has the flexibility to
handle instruments with piezo transducers or magnetic pick-ups, plus microphones for both vocal
and instrument reproduction. Its 2 x 50 Watt stereo configuration gives you enough power to
perform on stage with superb clarity, while the provision of a balanced line out allows direct
connection to an external PA system for larger concert venues.
The built-in digital effects for Reverb, Delay and Chorus add an entirely new dimension to the range
of sounds available. If you want to add further effects, then there is a parallel effects loop with level
control.
One of the most difficult aspects of amplifying acoustic instruments is feedback. To help you
eliminate this, the AS100D features several ‘anti-feedback’ controls, including a Phase switch for each
channel and frequency controllable Notch Filters with selectable extra depth for channels 1 and 2. It
also features a fourth channel suitable for CD/MD, tape player or a drum machine if needed.
For clear and detailed performance, the AS100D is loaded with two 8” speakers and two high fidelity
polymer dome tweeters. There is also an internal limiter which allows you to push the maximum
level from the stereo 50 Watt output stage, whilst remaining distortion free.
Compact and portable, the AS100D offers great flexibility and is the ideal amplifier for the acoustic
player who wants the highest quality performance and natural tonal reproduction.
WARNING! - Important safety instructions
WARNING: This apparatus must be earthed!
APLEASE read this instruction manual carefully before switching on.
B ALWAYS use the supplied mains lead, if a replacement is required please contact your authorised Marshall
Dealer.
C NEVER attempt to by-pass the fuses or fit ones of the incorrect value.
D DO NOT attempt to remove the amplifier chassis, there are no user serviceable parts.
E Refer all servicing to qualified service personnel including replacement of fuses and valves. Servicing is
required when the apparatus has been damaged in any way, such as the power supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed
to rain or moisture, does not operate normally or has been dropped.
F NEVER use an amplifier in damp or wet conditions.
G ALWAYS unplug this apparatus during lightning storms or when unused for long periods of time.
H Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles and
at the point where they exit from the apparatus.
I DO NOT switch the amplifier on without the loudspeaker connected.
Note: This equipment has been tested and found to comply with the requirements of the EMC directive
(Environments E1, E2 and E3) and the Low Voltage directive in the E.U.
EUROPE ONLY - Note: The Peak Inrush current for the AS100D is 21 amps.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part
15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference in a residential
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 a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning 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 the receiver.
◆ Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
◆ Consult the dealer or an experienced radio/TV technician for help.
CAUTION: Any changes or modifications not expressly approved by the party responsible for compliance may
void the users authority to operate the equipment.
Note: It is recomended that all audio cables used to connect to the AS100D are of a high quality screen type.
These should not exceed 10 metres in length.
WARNING : Do not obstruct ventilation grille and always ensure free movement of air around the amplifier!
USA ONLY - DO NOT defeat the purpose of the polarised or grounding type plug. A polarised plug has two
blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The
wide blade or the third prong are provided for your safety. When the provided plug does not fit into your outlet,
consult an electrician for replacement of the obsolete outlet.
Follow all instructions and heed all warnings
KEEP THESE INSTRUCTIONS !
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1. Mains Input
Plug the mains power cord provided in here
2. Footswitch Jack Socket
For connection to the supplied remote footswitch
which provides switching of both internal and
external effects.
3. Effects Send
Sends the signal from the AS100D to the input of
an external effects processor.
4. Effects Level Control
Rotary control to adjust the external effects return
level.
5. Stereo Effects Return
Left (mono) and Right returns to accept the output
from an external effects processor. If the
processor is mono (such as a floor pedal),
connect to the left (mono) return jack.
6. D.I. Outputs
Left and right direct outputs, fully balanced for
connection to external PA mixing desk.
7. Line Out
Unbalanced Left and right direct outputs for
connection to recording or other outboard
equipment.
Channel 2 - Acoustic Instrument and
Microphone
9.Instrument Input
Mono jack input. Plug the lead from your guitar in
here to connect to channel 2 only.
10. Microphone Input
XLR type socket to connect a microphone to
channel 2.
11. Link Channel 1 Switch
Switch to link channel 2 (when an instrument with
a single stereo jack is connected) to the stereo
Input of channel 1 (see item 1). Channel 2 level
and EQ settings will affect the signal connected to
the ring of the stereo input jack. (item 1). Refer to
block diagram.
12. Contour Switch
Changes the contour of the channel EQ by cutting
the Mid by a predetermined amount.
13. Phantom Switch
If you require Phantom power for your condenser
microphone, pressing this switch provides +15V.
14. Phase Switch
Reverses the phase of the signal to cut out
unwanted resonances caused by the instrument
and speakers being in phase. This can
considerably reduce the amount of low frequency
acoustic feedback.
Ensure that you test this in the position where you
will actually perform.
15. Volume Control
Adjusts the volume level of channel 2.
16. Bass Control
Adjusts the amount of bottom end or bass in your
sound. Too much bass can cause unwanted feed
back, therefore care should be taken when setting
this control. The best position to start is 12
o’clock, then adjust from there as desired.
17.Treble Control
Adjusts the high end or treble frequencies in your
tone. Again, care should be taken when setting
this control as too much treble will cause high
pitched feedback. The starting point of the 12
o’clock position is best.then adjust from there to
suit your own preference.
Channel 1 and Channel 2 mix
Anti Feedback Section.
18. ‘On’ Switch
Activates the Anti Feedback filters (items 21 & 22)
for both acoustic instrument channels.
19. Depth Switch
Increases the depth for both notch filter controls
20 & 21.
20. Rotary Feedback Filter (Sweep 1)
Sweeps the band of frequencies most likely to
cause body resonance (the main offending
feedback frequencies) from 50Hz - 250Hz and
reduce it when selected.
21. Rotary Feedback Filter (Sweep 2)
Provides a second sweep of a broader band of
frequencies (60Hz - 650Hz) to help remove the
second offending frequency.
TIP: In order to select and eliminate the offending
frequencies, select the point where the feedback just
appears and move the frequency control until it
disappears. Next, increase the gain level until the
feedback reappears and adjust the frequency again,
then back off the level slightly.
Channel 1 and Channel 2 mix
Effects Switches
22. Internal Effects Switch
Activates the internal stereo digital effects section
for the acoustic instrument channels.
23. External Effects Switch
Activates the external effects loop for the acoustic
instrument channels.
Channel 3 - Microphone
24. Microphone Input
XLR type socket to take the input from an external
microphone for either vocal or instrument
reproduction.
25. Phase Switch
Reverses the phase of the signal to cut out
unwanted resonances caused by the instrument
and speakers being in phase.
26. Phantom Switch
If you require Phantom power for your condenser
microphone, pressing this switch provides +15V.
AS100D Front Panel Features
AS100D Rear Panel Features
AS100D Front Panel Features
27. Volume Control
Adjusts the volume level of channel 3.
28. Bass Control
Adjusts the amount of bottom end or bass in your
sound. Too much bass can cause unwanted feed
back, therefore care should be taken when setting
this control. The best position to start is 12
o’clock, then adjust from there as desired.
29. Treble Control
Adjusts the high end or treble frequencies in your
tone. Again, care should be taken when setting
this control as too much treble will cause high
pitched feedback. The starting point of the
12 o’clock position is best, then adjust from there
to suit your own preference.
30. Internal Effects Mix Control
Selects the amount of effect from the built in
digital effects for channel 3 only.
31. External Effects Mix Control
Selects the amount of effect on channel 3 from
any external effects processor connected through
the FX Loop.
Channel 4 - Auxiliary
32. Phono Inputs
Left and right phono sockets for connection to
CD/MD/Tape player, Drum Machine or other
backing equipment. This channel works in stereo.
33. Volume Control
Controls the volume level of the auxiliary channel.
Stereo Digital Effects
34. Program Select Control
Rotary control to select one of the 16 digital
effects programs.
35. Parameter Adjust Control
Adjusts the main parameter of the effect selected
by Program Select Control (item 34). The main
parameter is decay time for all Reverb and Delay
programs. For Chorus, Flange and Modulation
programs, it is the Speed.
36. Effects Level Control
Controls the amount of the digital effects signal in
the mix.
Master Volume
37. Master Volume Control
Controls the overall volume level of the AS100D.
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Acoustic Channel 1 Anti-Feedback MasterFX
Acoustic Channel 2 Microphone
Instrument Microphone
0
Volume
10
0
Volume
10
-
Bass+-Mid
+
-
Bass+-Treble
+0
Volume
10 -
Bass+-Treble+0Int. FX
10 0
Ext. FX
10
Adjust
250Hz
Mid Frequency
2.5kHz -
Treble
+50Hz
Sweep 1
60Hz250Hz
Sweep 2
650Hz
Volume
Power
Stereo Digital Effects
Input Volume
R
Gain
Phase
Phase
PhantomContour
Link Ch1
Phantom
Int. FX
Ext. FX
L
Level
010
010010 010
Program
1 - 3 Halls
4 - 6 Rooms
7 - 9 Plates
10 Non Linear
11 Chorus
12 Flange
13 Delay
14 Chorus Room
15 Ch/Dly/Room
16 Modulation
Aux
Input
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
On
Depth
Phase
O
I
Return
RightLeft
RightLeft
Footswitch
Send
Level
D.I. Output
Effects Loop
Line Out
RightLeft / Mono
- +
Mains Input
CAUTION!: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
ATTENTION!:POUR EVITER LES RISQUES DE DECHARGES ELECTRIQUES, NE PAS OUVRIR LE COUVERCLE. CET APPARRILNE COMPORTE
AUCUNE PIECE SUSCEPTIBLE D’ETRE REPAREE PAR VOS SOINS. FAITES TOUJOURS APPELA UN TECHNICIEN QUALIFIE POUR TOUTE REPARATION.
WARNING!: SHOCK HAZARD. DO NOT OPEN. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE
THIS EQUIPMENT TO RAIN OR MOISTURE. THIS APPARATUS MUST BE EARTHED.
AVIS!: RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR. POUR EVITER LES RISQUES D’INCENDIE ET DE DECHARGES
ELECTRIQUES, N’EXPOSEZ JAMAIS CETAPPAREIL A L’HUMIDITE OU ALA PLUIE. CONNECTER CET APPAREIL A LATERRE.
!
Made in England by:
Marshall Amplification plc,
Bletchley,Milton Keynes, England.
Output 2x50 WattsRMS 4 Ω
Output 2x50 WattsRMS into 4 Ω
280 Watts
120V ~ 60 Hz
NOTE:This device complies with part 15
of the FCC Rules. Operation is 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.
AS100D Front Panel
AS100D Rear Panel
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9
1
10 15 16 17 27 28 29 30 31 32 3312 13
2 4 7 8 21 34 36 375 6 20 35
3
18
19
22
23
11
26
2514
24
2 3 4 5 6 7
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