ORANGE ACOUSTIC PRE User manual

THANKYOUFORCHOOSING ORANGE
Ever since the founding of the company in 1968, Orange has been a pioneering force in the guitar amplification
industry. Today, with a team of the world’s finest amplifier engineers, Orange continues to push back the boundaries
of conventional valve amplifier design.
Our commitment to craftsmanship and quality control has allowed our amplifiers to stand the test of time, giving their
owners as much pleasure now, as the day they were bought. To maintain this level of excellence, each Orange
amplifier is put through many rigorous test procedures before leaving the factory.
The warmth, tonal quality and rich harmonics generated by a valve amplifier cannot be reproduced by ‘artificial’
means. Many guitarists have reached the same conclusion: neither the transistor nor the microchip is a true
alternative to valve technology.
This manual contains valuable technical and safety information. Please take the time to read this manual as the
information may enhance the sound and performance of your amplifier. We are confident that you will be delighted
with your new purchase and that it will provide you with many years of enjoyment. You are now a member of the
Legendary British Guitar Amplifier Owners Club!
In the interests of product improvement, the contents of this manual may be subject to change without
notice. Ensure you are viewing the latest version at www.orangeamps.com
ACOUSTIC PRE
OWNER’S MANUAL
DESIGNED AND ENGINEERED BY ORANGE MUSIC ELECTRONIC COMPANY LTD.
108 RIPON WAY, BOREHAMWOOD, WD6 2JA, UK. ORANGEAMPS.COM

23
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety 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. If the provided plug does not
fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in
any way, such as 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.
The exclamation point within an equilateral
triangle and "WARNING" are intended to alert
the user to the presence of important
operating or servicing instructions. Failure to
heed the instructions will result in severe
injury or death.
This equipment should be used under the
supervision of an adult
at all times.
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the user to the presence of un-insulated
‘dangerous voltage’ within the product’s
enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to
persons. Terminals labelled as “SPEAKER
OUTPUTS” must be connected to a speaker
cabinet of the designated load (Ω) rating using
an un-shielded two conductor cable for
speaker use at all times during operation.
The “Caution, hot surface” symbol indicates
that the marked item may be hot.
Do not cover or block ventilation openings.
Ensure the apparatus is installed with plenty
of space around the unit (> 6”/12.5cm) as this
apparatus may generate heat under normal
use. This equipment is not intended to be
used on soft support (like beddings, blankets
etc.). This equipment should always be placed
on a flat, stable surface.
To reduce the risk of fire and electric shock do
not expose this apparatus to rain or moisture.
For indoor use only. Do not use in damp
environments, e.g. bathrooms etc.
Do not place objects containing liquids on,
or near the product.
Do not operate this apparatus or connect/
disconnect a power plug whilst hands are wet.
Do not attempt to gain access to
the interior of the product. No user serviceable
parts inside. Refer all servicing to qualified
servicing personnel.
This symbol indicates this product is classified as Waste Electrical and Electronic Equipment (WEEE) in the European Union and should not be discarded
with household waste. Contact your local authority for more information and details of your nearest approved disposal facility.
START UP PROCEDURE
Wait for the light to finish flashing prior to switching on speakers or make sure appliances are muted.
This Orange Amplifier conforms to EN 60065:2014 for Audio, Video and Similar Electronic Apparatus - Safety Requirements. EN50581: Technical
documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances. EN 61000-6-3:2007
Electromagnetic compatibility; This equipment has been tested and found to comply with the limits for 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.
Where indicated or stated on the product/unit:
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.
Note: This equipment has been tested and found to comply with the limits for 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 and correct the interference by one or
more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and 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.
Note: Changes or modifications not expressly approved by Orange Music Electronic Company Ltd. could void the user's authority to operate the
equipment.
For customers in Canada: Where indicated or stated on the product/unit: This Class B digital apparatus complies with Canadian Interference Regulations
CAN ICES-3(B)/NMB-3(B).
MONO INPUT - MONO OUTPUT
MONO INPUT - STEREO OUTPUT
Connect a single pickup guitar to
Channel A for shimmering
harmonics and subtle compression.
Alternatively, use Channel B for an
uncoloured, flat response.
Connect a single pickup guitar to Channel
A for shimmering harmonics & subtle
compression. Alternatively, use Channel B
for an uncoloured, flat response.
Using a patch lead to 'jumper' FX
Send A to FX Return B routes
Channel A's signal to both outputs.
This also allows the on-board
Reverb to run in stereo.
Individual Balanced XLR Outputs for
each channel connect to your P.A.
mixing console or recording interface
for total control over your mix.
For a simple, mono stage setup,
connect the Line Ouptut jack to a
powered monitor. Adjust the level
with the Line Volume control.

FX
PEDAL
FX
PEDAL
GUITAR + MICROPHONE - STEREO OUTPUTS 2 GUITAR SOURCES - STEREO OUTPUTS
FOOT
SWITCH
STEREO FX
Connect an external microphone to
Channel B's XLR input. +48V
Phantom Power is provided for
condenser microphones.
Run stereo FX by connecting FX
Loop A to your FX unit's Left In/Out
and FX Loop B to your FX unit's
Right In/Out.
Individual Balanced XLR Outputs for
each channel connect to your P.A.
mixing console or recording interface
for total control over your mix.
Connect your guitar's internal pickup
and blend with an external microphone
for a studio-quality live sound or an
all-in-one recording preamp.
Mute with an external footswitch.
This cuts the signal at the FX Send
(loop pedals and delay tails keep
playing). Power light turns red to
indicate that the unit is muted.
Connect the mono Line Output jack
to a powered monitor. This is a
blend of both channels with an
independent level control for a
separate stage mix.
Connect the mono Line Output jack
to a powered monitor. This is a
blend of both channels with an
independent level control for a
separate stage mix.
Use the two separate FX Loops to
connect two totally independent FX
chains. Process your two sound sources
individually for limitless tonal options.
Connect a guitar with 2 internal
sound sources to the Input jacks of
both channels. Tailor each part of
your sound individually, with the
ability to correct phase problems.
Individual Balanced XLR Outputs for
each channel connect to your P.A.
mixing console or recording interface
for total control over your mix.
4 5

Controls the output level of the
balanced XLR outputs.
MAIN VOL
Controls the output level of the
unbalanced mono line output.
LINE VOL
Controls the level of the
onboard digital reverb.
REVERB
Adjusts the low shelf +/- 12dB
below 680 hZ.
BASS
Adjusts the high shelf +18dB
above 680 hZ.
TREBLE
Adjusts the input level
to Channel A.
GAIN
Adjusts the frequency selected
by the Freq control by +/- 18 dB.
MIDDLE
Selects the centre frequency for
the mid control (180Hz – 1.8kHz).
FREQ
Alters the level of valve gain in
the upper frequencies adding
harmonics and compression.
HEAT
Adjusts the high shelf +/- 9dB
above 680 hZ.
TREBLE
Adjusts the low shelf +/- 12dB
below 680 hZ.
BASS
Adjusts the input level to
Channel B.
GAIN
Adjusts the frequency selected
by the Freq control by +/- 18 dB.
MIDDLE
Selects the centre frequency for
the mid control (180Hz – 1.8kHz).
FREQ
MASTER
CHANNEL A
CHANNEL B
FRONT PANEL FEATURES
76
+48V ON
PHASE INV A
PHASE INV B
MUTE
GND LIFT A
GND LIFT B
Activates 48V phantom power on channel B’s XLR input
Inverts the phase of channel A
Inverts the phase of channel B
Mutes both channels at the FX loop send
(Delay trails and loop pedals will still be audible)
Lifts the ground of channel A’s output XLR
Lifts the ground of channel B’s output XLR
Input A
Input B
Mute Footswitch
FX Loop Send A
FX Loop Return A
FX Loop Send B
FX Loop Return B
Line output
Main Output A
Main Output B
12V DC 2.1mm DC
1/4’ Jack input to Channel A
1/4″ Jack and XLR inputs to Channel B (not to be used simultaneously)
Allows the mute function to be controlled by a latching footswitch
Connects Channel A to the input of an effects unit
Connects the output of an effects unit to Channel A output
Connects Channel B to the input of an effects unit
Connects the output of an effects unit to Channel B output
Mixes both channels to a mono unbalanced 1/4″ output Jack
Individual balanced XLR output for Channel A
Individual balanced XLR output for Channel B
Jack for connecting the supplied 12VDC centre negative power supply
1
1
2
3
4
5
6
7
8
9
10
11
2 3 4 5 6 7 8 9 10 11
FRONT PANEL SWITCHES
REAR PANEL FEATURES
1 2 3 4 5 6
1
2
3
4
5
6

Channel A input impedance
Channel B XLR input impedance
Channel B jack input impedance
FX send level
FX send impedence
FX Return level
FX return impedance
Line output level
Line output impedance
Main output level
Main output impedance
Power supply
Current draw
Dimensions
Weight
Maximum ambient temperature
2.2 MΩ
Minimum 6 KΩ
2.2 MΩ
-10 dBu
< 150Ω
-10dBu
10 KΩ
-10dBu
< 150Ω
+4dBu
< 60Ω
12V dc Centre Negative
750 mA
29cm x 15cm x 9cm
2.5kg
400
SPECIFICATIONS
DESIGNED AND ENGINEERED BY ORANGE MUSIC ELECTRONIC COMPANY LTD.
108 RIPON WAY, BOREHAMWOOD, WD6 2JA, UK. ORANGEAMPS.COM
3184582