Marshall Amplification Musical Instrument Amplifier AS80R User Manual

AS80R  
 
WARNING!  
PLEASE READ THE FOLLOWING LIST CAREFULLY.  
E
A. The Plug attatched to the mains lead provided is wired in accordance with the  
following colour code. Blue -neutral. Green/Yellow -Earth. Brown -Live (UK only).  
B. Always ensure that the value of the fuse corresponds to the rating marked on the plug.  
C. Never under any circumstances, operate the amplifier without an earth.  
D. Always have this equipment serviced or repaired by competent, qualified personnel.  
E. Do not attempt to remove the amplifier chassis, there are no user serviceable parts  
inside.  
L
N
G. Never use any amplifier in damp or wet conditions.  
H. Please read this instruction manual carefully before switching on.  
country style playing. This makes the Acoustic  
Soloist the ideal amp for singers who also need to  
play acoustic and electric rhythm guitar for their  
backing.  
Acoustic Soloist -AS80R.  
Due to the increased popularity of acoustic  
and electro/ acoustic instruments, a dedicated  
amplification system that can accurately  
reproduce the pureness of an acoustic’s unplugged  
sound is a must for many performers.  
Channel 3 -Transducer.  
The main Transducer channel is intended for  
piezo type acoustic transducers either direct from  
the instrument or from pre-amped devices.  
To amplify the subtle nuances and natural  
characteristics of acoustic instruments requires an  
amplifier of great flexibility and superb overall  
tone.  
It's highly flexible features include active  
volume and EQ, two specially designed anti-  
feedback filters and a unique ‘pick attack’ control  
which accentuates the contrast between plectrum  
and finger picking styles.  
The unique design and high versatility of the  
Acoustic Soloist offers all this within its three  
independent channels, each designed for a specific  
purpose but with the flexibility to provide much  
more -plus the ability for each channel to be used  
simultaneously.  
It also has a ‘pedal level’ effects loop suitable  
for connecting floor pedals such as delays,  
compressors, swell pedals etc, exclusively through  
this channel.  
Channel 1 -Microphone.  
Featuring a balanced XLR connector into a  
studio grade pre-amplifier with active volume and  
EQ controls.  
The Master Section.  
The Acoustic Soloist boasts an 80 watt stereo  
(40 watts per side) power amplifier specifically  
designed for wide frequency response and low  
distortion. Semi ‘soft knee’ limiting is included so  
maximum headroom can be achieved cleanly  
without any undue harshness.  
A phase switch is provided to prevent  
problems when linking an instrument in  
conjunction with a pick-up device through another  
channel.  
The flexibility of this channel enables the use  
of a microphone for either instrument or vocal  
reproduction, making the Acoustic Soloist ideal  
for the ‘solo’ performer playing small gigs, where  
space is at a premium.  
The built in stereo reverb creates warm,  
natural depth while Marshall’s renowned  
analogue chorus provides a stereo spread that adds  
incredible width to the sound.  
The Rear Panel.  
Channel 2 -Magnetic Auxiliary.  
The Acoustic Soloist features a ‘Phase  
Reversal’ switch on the rear panel that will help to  
eliminate one of the most common problems  
associated with amplified acoustic instruments -  
unwanted feedback and overtones. Furthermore, it  
does so without compromising the tone in the  
slightest.  
As well as being perfect for magnetic or piezo  
type acoustic pick-ups, this multi purpose channel  
is also ideal for inputing a backing tape or drum  
machine.  
A shift switch re-voices the channel to suit  
clean, electric guitar and is excellent for jazz or  
2
 
Also included are stereo line-outs, for direct  
linking to larger sound re-inforcement systems,  
an effects loop with mono send and stereo return  
jacks and Reverb/ Chorus footswitch jack.  
Channel 3 -Transducer.  
11. J ack input.  
With source select pushswitch for piezo or  
pre-amped input. Piezo -10 meg input. Pre-amp -  
100K input.  
Speaker com plem ent.  
To help ensure that the Acoustic Soloist’s  
sound remains warm and natural, we’ve used two  
specially voiced Celestion 10" speakers that have  
extended low and high frequency response with a  
flat mid-range. This means that the sound always  
has superb clarity and dynamic response even at  
high volume levels. Also a piezo type dome  
tweeter provides all the high-end crispness you  
could ever need.  
12. Active Volum e/ Gain control.  
Controls the channel gain level.  
13. FB1 & FB2 Anti-Feedback filters.  
Very narrow notch filters centered on the two  
frequency bands normally problematic with  
acoustic guitars.  
14. Pick Attack control.  
Centre off control to add or subtract the  
higher harmonics of the signal to either remove  
pick noise or accentuate these frequencies when  
utililising finger style playing.  
Fro n t P a n e l  
Channel 1 -Microphone.  
15. Pedal Level Effects Loop.  
1. XLR -Balanced input.  
(Pre gain and EQ) Effects loop to match  
floor pedals. 1 meg Ohm return impedance to  
prevent interaction with swell pedals.  
Input to mic, pre-amplifier.  
2. Phase switch.  
16. Fixed EQ.  
Reverses the phase of channel 1 only -to  
prevent frequency cancellation problems when  
mic’ing an instrument in conjunction with a pick-  
up device through another channel.  
Sweepable mid range circuit + or -12dB,  
250Hz to 2K5Hz.  
17. Low and high active E.Q.  
3. Active Volum e/ gain control.  
Provides cut and boost of + or -12 dB at  
80 Hz (lo) and 8 KHz (hi).  
For optimum headroom/ noise performance  
controls the channel gain level.  
Master Section.  
4. 3 Band active EQ.  
Provides cut and boost of + or -12 dB at  
80 Hz (lo), 600 Hz (mid) and 8 KHz (hi).  
18. Mix control.  
Controls the level of effects/ dry signal when  
using external effects processors through the  
effects loop.  
5. Chorus in/ out push switch.  
Selects the chorus in or out of this channel.  
19. Stereo Reverb.  
Channel 2 -Magnetic Auxiliary.  
With depth control, footswitchable with LED  
status indicator.  
6. J ack input.  
20. Output volum e.  
Jack input of approximately 10 Meg input Z.  
Controls the overall output volume level.  
7. Shift push switch.  
21. Stereo Chorus.  
Selects flat response for acoustic and tailored  
response for electric guitar.  
Front panel on/ off switch for Stereo Chorus  
with LED indication. Note:( this item is also  
footswitchable (see item 23).  
8. Active Volum e/ Gain control.  
Controls the channel gain level.  
For the footswitch to function the panel  
switch should be pushed to the‘inposition.  
9. 3 Band Active EQ.  
Provides cut and boost of + or - 12 dB at  
22. Stereo Chorus.  
80 Hz (lo), 600 Hz (mid) and 8KHz (hi).  
Dual voice LFO’s with resonance, intensity  
and rate controls.  
10. Chorus in/ out push switch.  
Selects the chorus in or out of this channel.  
3
 
Re a r P a n e l  
23. Footswitch jack.  
Twin footswitch for chorus and reverb  
switching functions.  
24. Effects Send jack.  
Jack socket to feed the input of an external  
effects processor.  
25. Effects Return jacks.  
Sockets to accept the left and right outputs  
from an external effects processor.  
26. Phase Reversal switch.  
Reverses the system phase to enhance  
acoustic control (feedback and overtone  
elimination) when using the amplifier in a  
confined space with the guitar.  
27. Line Out jacks.  
Left and right line out jacks suitable for  
direct connection to PA or recording mixers.  
5
 
Front Panel  
11  
1
2
3
4
5
12  
13  
14  
18  
19  
20  
21  
Microphone  
Transducer  
Acoustic Control  
FBF2  
Volume  
Lo  
Mid  
Hi  
Volume  
FBF1  
Attack  
FX Return  
Reverb  
Output  
Volume  
ACOUSTIC  
Input  
SOLOIST  
Chorus  
Chorus  
0
10 -12  
+12 -12  
+12 -12  
+12  
+12  
0
10  
0
10  
0
10  
-
+
0
10  
0
10  
0
10  
0
0
Phase  
Input source  
Return  
Reverb  
On  
Chorus  
On  
E.Q.  
Chorus  
Send  
1
Power  
Model A1080  
10  
Volume  
-12  
+12 -12  
+12 -12  
-12  
+12 -12  
+12 250  
2k5 -12  
+12  
0
10  
min  
max Slow  
Fast LFO1  
LFO2  
Shift  
Lo  
Mid  
Hi  
Pedal Loop  
Lo  
Mid  
Frequency  
Hi  
Resonance  
Intensity  
Rate  
Modulation  
Magnetic/Auxillary  
16  
17  
6
7
8
9
10  
15  
22  
Rear Panel  
Where applicable, This Apparatus Must Be Earthed  
Line Out  
Effects Return  
WARNING! No user serviceable parts inside; refer servicing to qualified  
Rev/Chorus  
personnel only.  
Left  
Right  
Left  
Right  
Effects send  
Footswitch  
WARNING! Risk of shock. Do not open  
Output  
Phase  
MAIN S IN PUT  
AVIS! Risque de choc. Ne pas ouvrir.  
2 3 0 V  
~
5 0 Hz  
Fire & Shock Hazard: Do not expose this unit to rain or moisture.  
3 5 0 W a tts  
+
Manufactured in Great Britain by: Marshall Amplification plc, Bletchley,  
Milton Keynes.  
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24  
27  
26  
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