Ashdown ABM EVO III User manual

OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
ABM EVO III Preamplifier, Amplifier Heads and Combos

Thank you for purchasing your Ashdown Engineering Amplifier. If you live in the UK, please register your
purchase by completing this form and return it to the following address:
Ashdown Engineering, The Stables, Stevens Farm, Mashbury Road, Chignal St ames,
Chelmsford, Essex CM1 4TX, England
(Alternatively you can register online at http://www.ashdownmusic.com)
If you live outside the UK, the local Ashdown distributor may have included a specific registration form
for your country.
Your Ashdown Engineering product details:
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Colour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tested by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 YEAR WARRANTY
Your Ashdown Engineering amplifier has been manufactured to the highest standards, using the best-
selected materials. To ensure its optimum performance, please ensure your amplifier is regularly
serviced. This product carries a one year warranty, against defects in materials and workmanship, for the
original purchaser. Ashdown Engineering will, at their discretion, replace or repair any product or part
thereof, which is found by Ashdown Engineering to be defective. This warranty shall not apply to the
damage of covering, fittings or finishes when affected by carelessness, accident or extreme climate
changes. Nor does it apply to normal wear and tear of parts such as valves, fuses, light bulbs, speakers,
controls etc.
Please complete the lower section of this warranty and return it within 10 days of purchase to Ashdown
Engineering Ltd. at the above address. In the unlikely event of any defect, please contact an authorised
Ashdown Engineering dealer. All transport charges are to be pre-paid by the Owner. Unless the
registration card is returned normal country warranty laws apply.
Please complete and return this warranty within 10 days of purchase. Include any comments if possible.
Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Purchased from . . . . . . . . . . . . . . . . . . . . . . . . . . .
Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Age . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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IMPORTANT - REGISTRATION CARD

BASIC PRECAUTIONS
WARNING - When using electrical products,
basic precautions should be followed,
including the following:
1. Read all the instructions before using the
product.
2. Do not use this product near water – for
example, near a bathtub, washbowl,
kitchen sink, in a wet basement or near a
swimming pool.
3. This product may cause permanent
hearing loss. Do not operate for long
periods of time at a high volume level or
at any level that is uncomfortable. If you
experience any hearing loss or ringing in
the ears, you should consult an
audiologist.
4. Make sure nothing interferes with the
ventilation of the product when in use.
5. The product should be located away
from heat sources such as radiators, heat
registers, or other products that produce
heat.
6. The product should be connected to a
power supply of the type described in
the operating instructions or as marked
on the product.
7. The power supply cord of the product
should be unplugged from the outlet
when left unused for a long period of
time.
8. Care should be taken so that objects do
not fall and liquids are not spilled into
the enclosure through openings.
9. The product should be serviced by
qualified personnel when:
a. The power supply cord or the plug
has been damaged; or
b. Objects have fallen, or liquid has been
spilled into the
product: or
c. The product has been exposed to rain
or moisture: or
d. The product does not appear to
operate normally or exhibits marked
change in performance: or
e. The product has been dropped, or the
enclosure damaged.
10. Do not attempt to service the product.
All servicing should be referred to
qualified service personnel.
11. For continued protection against the risk
of fire, replace fuses only with those of
the same type and rating as indicated on
the back of the product.
WARNINGS USED ON THE EQUIPMENT
The lightning flash with the
arrow head symbol within an
equilateral triangle is intended
to alert the user to the presence
of uninsulated ‘dangerous voltage’ within this
product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric
shock.
The exclamation point within an
equilateral triangle is intended
to alert the user to the presence
of important operating and
maintenance (servicing) instructions in the
literature accompanying this product.
GROUNDING INSTRUCTIONS
This product must be grounded (earthed). If
it should malfunction or break down,
grounding provides a path of least resistance
for electric current to reduce the risk of
electric shock. This product is equipped with
a supply cord having an equipment
grounding conductor and a grounding plug.
The plug must be plugged into an
appropriate outlet that is properly installed
and grounded in accordance with the local
codes and ordinances.
DANGER - Improper connection of the
equipment grounding conductor can result
in a risk of electric shock. Check with a
qualified electrician or serviceman if you are
in doubt as to whether the product is
properly grounded. Do not modify the plug
provided with the product – if it will not fit
the outlet, have a suitable outlet fitted.
The wires in this mains cord are coloured in
accordance with the following code:
Green & Yellow - Earth
Blue - Neutral
Brown - Live
CE MARK FOR EUROPEAN
HARMONISED STANDARDS
The CE mark which is attached to these
products means it conforms to EMC
Directive (89/69/EEC), CE mark Directive
(93/68/EEC) and Low Voltage Directive
(72/23/EEC).
Important Safety Instructions

This is a NO COMPROMISE design using the
best parts available wherever possible.
Some examples of this are as follows:
• Gold plated jack sockets for reliability and
long life.
• Powerful output stages for extra
headroom (rated in English RMS real
power and not MUSIC or PEAK power as
these can claim to be 2 or 3 times the
actual real power of the amplifier).
• Doubling up of the cooling fans for
reliability and reduced fan noise (2 fans
can run at half the speed to provide the
same cooling capacity and as a
consequence generate only half the noise
of one fan running at twice the speed).
• Speed controlled fan drive circuit. Again
this reduces the amount of fan noise as
the fans run slow when the unit is cool
and increase in speed with output power
demands.
• Powerful TOROIDAL mains transformer.
This is more expensive than a laminated
stack transformer but has better
regulation, i.e., provides more power on
demand without sagging out and also
has a minimal external magnetic field
which means that single coil pick up
basses are less likely to pick up mains
hum from the amplifier.
• FET input circuit to the preamp for
‘Warmth’ even when using the CLEAN
input mix setting.
• D.C. heaters for the TUBE section for low
noise operation.
• Switch on delay for silent power up.
• Thermal trip for output protection.
• Relay switched speaker output lines for
silent power down.
• Sub Bass output and Sub Harmonics
facility for really serious bottom end.
Everything possible has been done to make
this a reliable, top of the range, minimum
service, high quality, long lasting powerful
bass amplifier.
We know you will appreciate the effort that
has been put into the design and
manufacture of this unit and you will be
rewarded in your choice of bass amplifier by
long life and reliability.
ABM EVO III Design Phi osophy

Front Pane Faci ities
INPUTS - There is a single instrument input
provided linked to a PASSIVE/ACTIVE selector
switch. The Passive input (switch out) is high
sensitivity and also high impedance to suit
the output from PASSIVE basses. The Active
input (switch in) is low sensitivity and lower
impedance to suit the output from ACTIVE
basses.
INPUT CONTROL - The INPUT control sets
the signal level through the preamp in
conjunction with the INPUT LEVEL VU Meter.
This is adjusted to give a reading of 0VU on
the meter for average playing dynamics with
occasional peaks into the red region. Please
note that the setting of this may have to be
re-adjusted after modification of the EQ
controls.
PUSH FLAT / SHAPE - With this button in its
OUT position a fixed E.Q. is superimposed on
the preamp to give a bright but punchy
character to the sound. Pushing this button
IN returns the preamp to a Flat frequency
response.
This function may also be controlled from a
footswitch. For the footswitch to operate this
button must be in its OUT position.
AL E DRI E - This routes the signal either
through a clean Solid State amplification
section (control on zero) or through a Dual
Triode Tube amplification/overdrive section
in order to add either tonal character i.e.
warmth with the control set at 9 o’clock, a
slight edge in the sound at 12 0’clock
through to an increasing degree of Tube
distortion/overdrive as the control is
advanced to maximum.
A Mix of these two amplification sections can
be achieved with this control.
N.B. The degree of tube distortion provided
by this control will also depend on the
setting of the INPUT control.
AL E DRI E IN/OUT - This push button
switches the valve drive section IN or OUT.
This function may also be controlled from the
Ashdown 4 way footswitch. For the
footswitch to operate this button must be in
its OUT position.
E.Q. IN / OUT - This push button switches the
Equalisation section IN or OUT i.e. the Bass,
Middle and Treble controls plus the two sets
of sliders placed between each of these.
This function may also be controlled from the
Ashdown 4 way footswitch. For the
footswitch to operate this button must be in
its OUT position.
EQUALISATION - This consists of BASS,
MIDDLE and TREBLE controls with two sliders
placed between each control. This can be
used in a number of ways:
Firstly as a very simple Bass, Middle and
Treble tone control section as found on older
traditional amplifiers. This is done by leaving
the two sets of sliders interposed between
these controls set in their centre positions
and using only the BASS, MIDDLE and TREBLE
controls to alter the overall tone.
Secondly, if more control is required then the
sliders can also be used to tailor the E.Q. in
the regions between the main tone controls.
This provides a very versatile Equalisation
section, it is simple to understand and
operate, yet provides a wide degree of
variation. It retains the simplicity of a three-
control tone section but provides the
flexibility of a graphic equaliser.
COMPRESSION – Adding a small amount of
compression gives a fat bottom end to the
sound and allows a greater volume of
amplification to be used without the playing
peaks distorting the amplifiers output stage.
You will also find that this will add definition
to your playing bringing out notes within a
run more clearly as it evens out the dynamics
of your playing.
A large amount of compression can be used
as an effect but it will tend to reduce the
dynamics in your playing to such an extent
that the volume of the note will be the same
no matter how hard or soft you hit the string.
Compression also adds sustain to notes
making them longer before they die away.
The Compression Level control adjusts the
degree of compression applied to the bass
signal. For this to function correctly the Input
Level must be correctly set as described in
the INPUT CONTROL section (left).
When the Input Level is correctly set there
will be hardly any difference in volume
between Compression IN and Compression
OUT. This is because the amplifier
automatically compensates for the reduction
in level that would be apparent when
Compression is added by increasing the
overall gain to restore the volume to its pre
compression level, because of this you may
notice an increase in background noise with
high compression settings.
COMPRESSION IN/OUT – This push button
switches the Compression IN or OUT. This
function may also be controlled from the
Ashdown 4 way footswitch. For the
footswitch to operate this button must be in
its OUT position.
SUB HARMONICS - This section produces
Sub Harmonics an octave below the notes
being played. The level of these Sub
Harmonics relative to the straight bass sound
can be adjusted using the LEVEL control.
This is very effective in thickening the sound
and you will find in use that only a small
degree of this lower octave is required to
really fill out the sound and provide a
character that is not possible by any other
means.
The degree of Sub Harmonics is also
dependant on the setting of the BASS
control.

Front Pane Faci ities (continued)
DIRECT INJECT (D.I.) - A balanced D.I. is
provided on a latching XLR socket. This has a
push button placed below it that allows the
user to choose either a Pre E.Q. signal (button
pushed IN) or a Post E.Q. Post Sub and effects
signal (button OUT).
The output signal from this XLR socket is set
to a level and impedance suitable for
connecting directly into the Microphone
input of a mixing desk for either Direct
Injection into the PA system or for recording.
This must ONLY be used into a Balanced
Microphone input, it is not intended for any
other type of connection.
This has a floating ground that is referenced
to the mixing console it is plugged into and
should not need ground lifting. It is also
unaffected by Phantom Powering on the
Microphone input.
Make sure your XLR plug does not have the
shell of the plug internally connected to
signal ground or this will connect the system
to chassis ground of the ABM and may cause
problems with hum.
PUSH TO MUTE - When pushed IN this
button mutes the output from the preamp to
the power amp, mutes the output from the
D.I. socket and mutes the output from the
LINE Out socket as well. This leaves the
output from the TUNER socket still available
to allow muted tuning. An LED is provided
next to this switch to indicate when the
amplifier is muted. This function operates
only from the front panel MUTE push switch.
i.e. pressing this button mutes all sound from
the amplifier and allows a tuner connected to
the TUNER socket to operate for silent tuning.
Release the button and you are back in
action again.
TUNER OUT - This output socket provides a
line level signal that can be used for a
permanent connection to a tuner.
The signal from this socket remains when all
other outputs from the amplifier are Muted
allowing all sound from the amplifier to be
silenced while tuning is in progress.
LINE OUT -This output socket provides a line
level/post Output Level control signal for
connection to an external power amplifier
driving additional speaker cabinets.
OUTPUT LE EL - The OUTPUT control
adjusts the overall level of the amplifier.
Adjust this for your preferred overall stage
playing volume.

Rear Pane Faci ities
LINE INPUT - The rear panel has a Line Input
socket for connection of other signal sources
into the system. This can be used for
plugging a CD, Tape or MP3 player into the
amplifier for practising, rehearsing or for
connection of a second pre-amp into the
system.
EFFECTS SEND / RETURN - A serial effects
loop is provided at a level of 0dB.
The EFFECTS SEND socket can also be used as
a Line Out socket if required as the signal
path through the preamp is only broken
when a jack plug is inserted into the EFFECTS
RETURN socket.
The EFFECTS SEND is situated after the EQ,
the Valve section the Compression and the
Sub Bass Processor.
4-WAY FOOTSWITCH SOCKET - For the 4
way footswitch to operate it is essential that
the corresponding front panel push buttons
be in the OUT position.
This is a mono jack socket for connection of
the optional Ashdown 4 way footswitch only
(available from your Ashdown dealer, or
online at www.ashdownmusic.com/shop).
Always connect this prior to turning on the
power to the amplifier as the footswitch
derives its power from the amplifier and
sends a serial data stream to the amplifier in
order to operate the various functions.
Each of the 4 facilities available for selection
is indicated by an LED that will light when
that facility is selected from the footswitch.
CROSSO ER AND OUTPUTS (Rack Preamp
only) - The BASS MAGNIFIER RACK PRE-AMP
has a built in high precision CROSSOVER with
separate jack socket outputs for the HIGH
PASS and LOW PASS signals.
Crossover frequency is adjustable from 35 to
160Hz with a level control for the LOW PASS
output to adjust the balance between LOW
and HIGH outputs signals.
There is also a FULL RANGE jack line output
provided.
This section is provided with switched output
levels for simplified connection to power
amplifiers that require either a 0dB or +4dB
signal level. This switches the levels of all
three outputs.
SPEAKER OUTPUT (except Rack Preamp) -
The Speaker Output sockets are also situated
on the rear panel of the unit.
o
I
EVOIII 500
EVOIII 900
EVOIII Rackmount Preamp

Specifications
INPUTS
High Input Impedance 3.9M Ohms Input range 150mV to 20V p-p
Low Input Impedance 10K Ohms Input range 300mV to 40V p-p
Line Input Impedance 22K Ohms Input level 0dBu nominal
Effects Return Impedance 22K Ohms Input level 0dBu nominal
OUTPUTS
Tuner Output Impedance 1K Ohms Level 0dBu nominal
Line Output Impedance 10K Ohms Level 0dBu nominal
Effects Send Impedance 22K Ohms Level 0dBu nominal
D.I. Output 600 Ohms balanced Level -20dBu nominal
(rackmount preamp only)
Low Pass (RPM-1 only) Impedance 1K Ohms Level switched 0/+4dBU
High Pass (RPM-1 only) Impedance 1K Ohms Level switched 0/+4dBU
Full Range (RPM-1 only) Impedance 1K Ohms Level switched 0/+4dBU
EQUALISATION
Shape (Push Flat) +8dB @ 50Hz & 4kHz, -8dB @ 400Hz, filter slope - 6dB/octave
Bass +/-15dB @ 45Hz
Middle +/-15dB @ 660Hz
Treble +/-15dB @ 7kHz shelving
Slider1 +/-15dB @ 110Hz
Slider 2 +/-15dB @ 340Hz
Slider 3 +/-15dB @ 1.3kHz
Slider 4 +/-15dB @ 2.6kHz
Frequency Response -3dB at 17Hz and 30KHz
Rackmount Preamp Crossover Variable between 35 and 160Hz
Speaker Outputs Minimum impedance 4 Ohms

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