Accusound AMA-1 User manual

Acoustic Amplifier Handbook

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.

AMA-1mk ii 100watt acoustic amplifier

172 Wadsley Lane, Sheffield, UK. S6 4EE 07774 782503

Contents:

Amplifier Use 2

Master, Tone & Reverb 3

Output Clip, Reverb Table 4

Quick Start 5

Technical Spec 8

Amplifier use AMA-1 mk11 (Quick start on Page 4)

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.

All the connectors are on the left of the amplifier, and all the controls on the right.

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. 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, Level and Phantom Power:

This control section changes the level of

the input signal taken from your

instrument or microphone.

The Input Clip LEDs show when there is a

good signal level and when the level is too

high. With a low level input signal these

LEDS may not illuminate. With a good

signal level they will flash or remain constant Green. When the signal is too high the

LEDS will remain constant Red. When the LEDS are mostly Green and only

occasionally flash Red, then the signal level is at its optimum level. To set these input

the signal to the amplifier at the highest level that is likely to be used. This means if

you are playing an instrument, play it loudly, if singing then sing loudly. Adjust the

Green Gain knob until the LEDs are Green with only occasional Red flashes. Do not be

afraid to use the green control as maximum, it is designed to operate at that level.

Whilst performing this setting point, the White Level knobs will do nothing. To get

the most out of your amplifier it is best to use the Gain control at as high a level as

possible whilst still maintaining the sound you want.

Pressing the black Phantom buttons, applies 12v phantom to Channel 1 or 2, the LED

will illuminate Red when Phantom is present. Phantom Power only appears on XLR

connections.

The level knobs allow the user to balance the two channels and should be used, if

possible, above 4 or 5.

Master Level Control:

The Master Level control, situated

at the bottom right of the amplifier

panel, controls the overall output

level of the amplifier. This control

should be used at any level to

produce the required output level.

Treble/Mid/Bass:

These yellow knobs provide 3

bands of tone control. Turning any

knob anti-clockwise will reduce the

level of that band, Treble, Mid or

Bass, rotating it clockwise increases

the level in that band. Note that

increasing these controls could

cause overload, if this happens

simply reduce the level by

decreasing the Level using the

White knobs at the top of the

panel.

Reverberation:

There are 16 different types of

reverberation available on each

channel. It has to be the same type

of reverberation on each channel

but the level of this reverberation

can be adjusted individually on

each channel from zero to max. The large Red knob, Effects Select, allows any

one of the 16 types of reverberation to be selected. There is a list of the reverb

styles associated with each number on the back of the amplifier. The Red

knobs, one on each side, allow the level of reverberation to be adjusted that is

applied to each channel. The smaller Red knob below the Effects Select knob

called Effects Parameter allows adjustment of one characteristic of each

individual reverberation. The parameter that is adjustable is indicated in the

next table, but it can be such characteristics as reverberation decay time, chorus

depth, flanger rate etc

Output Clip:

The Output Clip LED indicates when

too much signal is being fed through

the amplifier. If only short flashes of

Red are visible then the level is near

maximum if the LED becomes

constantly Red then there will be

distortion form the speaker and the

level is too high. The Master level

control should be turned anti-

clockwise to reduce the output level.

Reverberation Parameters:

Reverberation Description

Parameter

Spring Reverb

Reverb Delay Time

Room Reverb

Reverb Delay Time

Slapback Reverb

Reverb Delay Time

Hall Reverb

Reverb Delay Time

Chorus Reverb

Reverb Delay Time

Chorus

Chorus Depth

Delay

Delay Time

Delay Reverb

Delay Time

Octave

Octave up/down

Rotary Speaker

Rotation Speed

Reverb Tremolo

Tremolo Rate

Rotary Speaker

Rotation Speed

Flanger

Flanger Rate

Phaser

Phaser Rate

Tremolo

Tremolo Rate

LFO Wah

Wah Rate

This is written specifically for the harp play, please substitute your instrument

where ever it says “harp”

Please start by turning the knobs to the positions shown in the picture.

Connect your harp pickup to the input called “Channel 1", top left of the picture.

The input will accept either 3 pin male XLR or 1/4" jack plug.

Connect the mains cable to the mains socket, bottom left and press the top of the

illuminating switch next to it, the switch should illuminate, if not check you have

connected the mains cable correctly and that you have switched on the power at

the mains socket.

If your pickup requires phantom power, please press the small black button to the

left of the red LED under the word “Phantom” at the top right of the picture.

The red LED should now illuminate, if you do not require phantom power please

ignore this step.

Next turn the green knob, top right under “Channel 1 Gain” to position “3".

Now play your harp quite vigorously and see that the LED under the words “Input

Clip” illuminates green. Continue to turn the green gain knob and

Amplifier AMA-1 MKII Quick start 5

playing your harp until the LED starts to illuminate RED. Now turn the green

knob slightly anti-clockwise so the LED only illuminates green, perhaps with a

very occasional red flash. Don’t be concerned if the LED does not flash Green, it

simply means that your instrument has a low, but probably useable signal.

Next turn the white “Master” knob, bottom right, to 4 or 5 and turn the white

knob just under the green “Gain” knob to 3 or 4.

Now play your harp, sound should be coming from the amplifier.

If it is too quiet or you cannot hear any sound, turn the white knob under the

green “Gain” knob to 5 or 6 or further until you can hear yourself play.

If you need to turn this knob to 8 or above, then also turn the “Master” white

knob to 5 or 6 or above until you get the level of sound you require.

You are now setup.

It is better to have the Green and/or White knob at the top high and the white

“Master” knob low rather than the other way round.

If you are using two instruments then do the same with the other instrument,

plugging it into Channel 2.

Use the white knobs at the top right to balance the level between the two

instruments and the white “Master” knob at the bottom right to increase or

decrease the overall level.

The yellow knobs give 3 bands of tone control, turn anti-clockwise to decrease the

band and turn clockwise to increase the band. There is a centre notch to locate the

neutral position.

The red knobs are for the reverberation. The large knob indicates the type of

reverberation being used and the two red knobs, “Effects Level”, either side of the

large knob adjust the amount of reverb applied to each channel.

The red knob “Effects Parameter” changes some of the characteristics of the reverb

chosen, this should be adjusted to hear the changes, some are very subtle. Which

parameter is changed is listed on page 3, this is also listed on the back of the

amplifier.

Please now experiment and learn how the amplifier will work for you.

Call or email if you need help or assistance.

[email protected], or 07774 782503

Amplifier: 100watts class D amplifier.

Speaker: Full range dual cone 8" 4ohm 50Hz - 19kHz.

Speaker out: Output socket to connect passive aux speaker.

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.

Inputs: 2 identical channels; 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 pre/post control.

Phones: Mono feed signal with independent level control.

Power: 240AC 50 200VA IEC socket, UK lead supplied.

Must only be used with mains supply that has a protective earth connection.

Technical specifications and dimensions

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