Acoustic Amplifier Handbook
Contents:
Description 2
Features 3
Dimensions 4
Use 5
Technical Spec 8
Thank you for purchasing the Accusound AMA-1 acoustic amplifier.
Please read the enclosed information. This will help you to
understand the product in which you have invested and enable you to
get the most out of it.
Please take note of the safety warnings and as with all electrical
goods, do not attempt to open the product under any circumstances.
There are no user serviceable parts. All remedial work should be
referred back to Accusound.
Always protect your amplifier from damp. Any moisture on the
cabinet should be immediately dried using a cloth to prevent any from
entering the product through connector sockets or other points.
This unit must only be used with mains supply that has a protective
earth connection.
AccusoundAccusound
AccusoundAccusound
AMA-1 60watt acoustic amplifier
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
The Accusound AMA-1 acoustic amplifier is a professional quality, flexible product.
The amplifier is intended to be used with microphones or pickups with an XLR or
1/4" jack plug connector. Phantom power may be switched on and off using a front
panel button. Similarly the input sensitivity may be changed using a front panel
button, allowing use of many different instrument pickup or CD players.
The front panel also allows independent volume control along with overall system
volume. Three band tone control is available on each channel plus a parametric
control to allow selective enhancement or reduction of a particular frequency.
There are 16 different reverberation programs available. Both channels must use
the same reverberation channel, however the level of reverberation may be
adjusted on each channel independently from none to max.
If this is insufficient, external effects may be added by use of the send and return
sockets on the amplifier.
There is also a headphone socket with independent volume control to allow
personal listening or monitoring.
The DI output is selectable between pre and post main volume control so a clean
signal may be sent to your main amplification system if you are using the AMA-1 for
monitoring.
There are clipping indicators on each input, plus the output, to indicate when you
are approaching the overload limit of the amplifier. (Green indicates good signal
level, Red indicates close to clipping level, no LED illumination indicates a very low
input level.)
2.
Description;
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
The AMA-1 has many useful professional features to help you make the most of
your playing.
Phantom power (12v) is independently switchable on each channel.
Three band tone equalisation control. Bass, treble and mid control give you
complete control of your music and helps to optimise your surroundings.
Parametric control on each channel. 10dB boost or cut, adjustable, of any
frequency in the lower registers, adjustable by the frequency knob. The width or
spread of this boost or cut is also adjustable using the width knob.
16 programs of reverberation available on both channels. Programs from simple
spring reverb to more elaborate “slow deep flange with reverb”. The algorithms for
these reverbs have been developed by world famous programmers and are
available on many professional pieces of equipment. The level of the reverb added
to each channel may be adjusted independently.
Effects send and return are available to allow addition of standard effects pedals
and other outboard equipment, making your AMA-1 as fully expandible as you
wish.
The balanced DI output allows a clean signal to be sent to your main amplification
system if you are using your AMA-1 as a stage monitor. The DI output signal is
switchable from pre to post main volume control.
Headphones socket with independent volume control allows you to listen privately.
Built-in speaker stand socket on base for easy stand mounting. (Sturdy stand
should always be used)
Features:
3.
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
Dimensions
The AMA-1 is a compact, but powerful, acoustic amplifier.
Physical dimensions: 24cm (depth) x 26.5cm (height) x 34cm (width)
Weight: 8kg
Finish: black splatter effect.
Mains: 3 pin IEC socket with on/off switch and fuse.
(120/240 switchable, 2AT/1AT fuse)
Must only be used with mains supply that has a protective earth connection.
4.
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
Amplifier use
5.
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
Before switching on your amplifier, ensure all volume controls are at minimum
and connect all inputs and outputs.
Your instrument or microphone should be connected to input 1 or 2, each have
the same facilities so you may chose either and achieve the full use of the
amplifier.
Input 1 & 2 connectors:
These XLR/Jack input connectors will accept either 3pin male XLR connectors
or 1/4" (6.35mm) jack plugs. The input sensitivity is the same whichever
connector is used but may be switched using the 0/-20dB button. Phantom
power may be applied to the XLR connector, no effect will be noticed if the
phantom power button is on when you use the 1/4" jack connection.
Gain:
This control changes the input level taken from your instrument/microphone. To
get the most out of your amplifier it is best to use this control at as high a level
as possible whilst still maintaining the sound you want.
Frequency/width/level:
These controls adjust the parametric tone control on each channel. This control
allows you to make a tone control that operates on any frequency you desire.
First select the frequency by adjusting the FREQUENCY knob, counter-
clockwise for low frequency and clock-wise for high frequency.
Next adjust the boost or cut of this frequency using the LEVEL knob, counter-
clockwise for cut and clock-wise for boost.
Finally adjust the width of the control or the number of frequencies around the
selected frequency by adjusting the WIDTH knob, counter-clockwise for
narrower or fewer frequencies and clock-wise for wider or more frequencies.
This process may need to be repeated to optimise the effect you are trying to
achieve. This is particularly useful if the room in which you are playing or the
instrument you have has a particularly strong resonance at any frequency.
If you do not want to use this facility simply adjust the LEVEL knob to the
central position, a click stop is in the centre so it is easily found, and the filter
will have no effect.
Amplifier use cont
Bass/Mid/Treble:
This three band tone control provides boost or cut in the three bands, BASS for
low frequencies and TREBLE for the higher notes. The MID knob allows the
middle band to be adjusted in a similar manner giving a much higher degree of
control over the sound you produce.
Reverberation:
This control allows selection of the 16 in-built reverberation programs. The
numbers correspond to the list of effects on the lower front panel. Both
channels must have the same reverberation program but the level of
reverberation is independently adjustable on each channel.
Reverb Level:
This adjusts the level of reverberation on each channel, there are controls for
channel 1 for channel 2. These allow full control from zero to maximum
effect.
Power indicator:
The green LED indicates that the amplifier is on and working
correctly.
Clip indicators:
There are three CLIP indicators, one for each channel input and
one for the main output. When one of the input indicators
illuminates RED, this indicates that the input signal may be too
high and may cause the amplifier to distort. These indicators are
set to give the user plenty of warning so if the indicator only
illuminates occasionally and no distortion is heard, then there is no need to
take action. If you feel you should take action then either reduce the input by
turning down the signal arriving at the amplifier input if this is possible, i.e. if the
signal is from another device like a CD player etc. Alternatively select the “0"
Volume:
This is the main output volume control. This will adjust the output
level of both channels simultaneously. To get the best out of your
amplifier this control should be used in conjunction with the GAIN
knobs, the GAIN knobs should be as high as possible whilst still
maintaining the sound quality thus allowing the VOLUME control
to be as low as possible.
6.
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
position of the “0/-20dB” button.
If the output CLIP indicator illuminates RED, then the volume control knob
should be turned counter-clockwise. Again this indicator gives the user plenty of
warning that the level is approaching overload, if distortion is not heard then no
action is required but be aware that if the level increases yet further then
distortion may occur.
All clip indicators will remain unlit if a low signal is present and will illuminate
GREEN when a good working signal level is present. They will turn RED when
the signal is approaching clip level.
0/-20dB button:
This button changes the sensitivity of the input. When the button is out the
channel is in its lower sensitivity and will be quieter but will take a higher input
level, as may be expected if a CD player or similar is connected. When the
button is pressed in, the sensitivity is increased and will become louder, this is
suitable for microphones and other lower level signals.
Phantom Power button:
When pressed, this button applies 12v phantom power to the respective input,
the orange indicator is also illuminated. The two channels may have phantom
power applied independently. Phantom power is only applied to the XLR
connector, when a jack plug is connected and phantom power is on then no
power is applied to the input.
Phones socket:
This will accept standard stereo headphones, the amplifier is mono so left and
right will have the same signal.
Phones Level knob:
This will adjust the level going to headphones when connected. This control is
independent of the main volume control so the main speaker may be turned to
off and the phones may still have full volume.
Effects Send socket (FX Send):
This socket will allow connection of external effect units or pedals. This takes
the signal before the main volume control but after all other controls.
Effects Return socket (FX Rtn):
This return socket takes the signal back from the external effects unit or pedal.
DI Out socket:
This socket allows the output signal to go to an external amplification system.
The signal is taken from after all controls but before the main volume control.
Amplifier use cont
7.
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
Technical Specification
Dimensions:
Weight: 8kg
Finish: Black splatter effect.
Mains:
Inputs: 2 identical channels;
switchable low/high sensitivity,
balanced XLR or unbalanced 1/4" jack
Phantom power: 12v switchable on both channels.
Tone controls: Both channels identical;
Bass +/-10dB 120Hz;
Mid +/- 10dB 800Hz;
Treble +/-10dB 10kHz.
Reverberation: 16 programs available on both channels,
level independently adjustable.
DI Output: Balanced, switchable between pre/post final volume
control.
Phones: Mono feed signal pre-main volume
with independent level control
Power: 120/240AC (switched) 50/60Hz 200VA IEC socket,
lead supplied.
1amp T rated fuse must be used with 240v supply,
2amp T rated fuse must be used for 120v supply.
Must only be used with mains supply that has a protective earth connection.
Amplifier: 60watts class D amplifier.
Speaker: Full range dual cone 8" 60w 4ohm 50Hz - 19kHz.
Speaker out: Output socket to connect passive auxiliary speaker.
24cm(depth) x 26.5cm(height) x 34cm(width)
3 pin IEC socket with on/off switch and fuse.
(120/240 switchable, 2AT/1AT fuse)
Must only be used with mains supply that has a protective earth connection.
8.
172 Wadsley Lane, Sheffield, UK. S6 4EE +44 (0)114 220 3517
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