Owner’s Manual
IMPORTANT SAFETY INSTRUCTIONS
Classic Analog Bass Preamp
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
polarized or grounding-type plug. A polarized
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. Use only with a cart,
stand, tripod, bracket, or table
PORTABLE CART
WARNING
specified by the manufacturer,
or sold with the apparatus.
When a cart is used, use
caution when moving the
cart/apparatus combination
to avoid injury from tip-over.
13. Unplug this apparatus during lightning
storms or when unused for long periods
of time.
RISK OF ELECTRIC SHOCK! DO NOT OPEN!
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT
REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL.
The lightning flash with arrowhead symbol within an equilateral
triangle means “electric shock hazard”. It is intended to alert
the user to the presence of uninsulated “dangerous” voltage
within the product enclosure, that may be of significant
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle means
“Warning/Caution!”. It is intended to alert the user of the
presence of important operating and maintaining (servicing)
instructions in the literature accompanying the appliance.
CAUTION
14. 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.
15. This apparatus shall not be exposed
to dripping or splashing, and no object filled
with liquids, such as vases or beer glasses,
shall be placed on the apparatus.
16. Do not overload wall outlets and
extension cords as this can result in
a risk of fire or electric shock.
17. The MAINS plug or an appliance
coupler is used as the disconnect device,
so the disconnect device shall remain
readily operable.
NOTE: This equipment has been tested
and found to comply with the limits for a
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 to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving
antenna.
• Increase the separation between
the equipment and the 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.
WARNING — To reduce the risk of fire or electric shock, do not
expose this apparatus to rain or moisture.
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Classic Analog Bass Preamp
CAUTION: Changes or modifications to this
device not expressly approved by LOUD
Technologies Inc. could void the user’s
authority to operate the equipment under
FCC rules.
This apparatus does not exceed the
Class A/Class B (whichever is applicable)
limits for radio noise emissions from digital
apparatus as
regulations of the Canadian Department
set out in the radio interference
of
Communications.
Exposure to extremely high noise levels may
cause permanent hearing loss. Individuals
vary considerably in susceptibility to noiseinduced hearing loss, but nearly everyone will
lose some hearing if exposed
to sufficiently intense noise for a period of
time. The U.S. Government’s Occupational
Safety and Health Administration (OSHA)
has specified the permissible noise level
exposures shown in the following chart.
According to OSHA, any exposure in excess
of these permissible limits could result
in some hearing loss. To ensure against
potentially dangerous exposure to high
sound pressure levels, it is recommended
that all persons exposed to equipment
capable of producing high sound pressure
levels use hearing protectors while the
equipment is in operation. Ear plugs or
protectors in the ear canals or over the
ears must be worn when operating the
equipment in order to prevent permanent
hearing loss if exposure is in excess of
the limits set forth here:
Duration, per
day in hours
8 90
6 92
4 95
3 97
2 100
1.5 102
1 105
0.5 110
0.25 or less 115
Sound
Level dBA, Slow
Response
Typical Example
Duo in small club
Subway Train
Very loud classical music
The boss screaming at his minions about manual deadlines
Loudest parts at a rock concert
Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan.
Apparatet må tilkoples jordet stikkontakt.
Apparaten skall anslutas till jordat uttag.
Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household waste,
according to the WEEE directive (2012/19/EU) and your national law. This product should be handed over to an authorized
collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type of waste could have
a possible negative impact on the environment and human health due to potentially hazardous substances that are generally
associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the effective
usage of natural resources. For more information about where you can drop off your waste equipment for recycling, please
contact your local city office, waste authority, or your household waste disposal service.
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Classic Analog Bass Preamp
TABLE OF CONTENTS
Important Safety Instructions .............................................. 2-3
Table Of Contents .................................................................4
Introduction ..........................................................................4
Features ...............................................................................4
Classic Analog Bass Preamp Top Panel Features .....................5
Classic Analog Bass Preamp Rear and Bottom Panel Features .6
Classic Analog Bass Preamp Bottom Panel Features ...............7
Classic Analog Bass Preamp Suggested Settings ....................8
Classic Analog Bass Preamp Block Diagram ...........................9
Technical Specifications / Service Information .......................10
Introduction
The Ampeg Classic Analog Bass Preamp pedal is like having a choice of Ampeg amps
right on your pedal board. Dial in a wide range of authentic Ampeg tones with the 3-band
tone stack and highly flexible Ultra-Hi and Ultra-Lo circuits. It’s the most affordable way
into the pure analog bass tone of Ampeg.
Like all Ampeg products, your Classic Analog Bass Preamp pedal is designed by
musicians and built using only the best of components. Each pedal is tested to confirm
that it meets our specifications, and we believe that this pedal is the absolute best that
it can be.
In order to get the most out of your new pedal, please read this manual before
you begin playing. Best of luck in all of your musical endeavors!
And thank you for choosing Ampeg.
Features:
• Delivers a wide range of authentic Ampeg tones.
• Classic 3-band tone stack plus volume.
• Ultra-Hi and Ultra-Lo circuits for tonal flexibility.
• True bypass, analog design with incredible signal-to-noise ratio.
• Roadworthy all-metal chassis construction.
• 9V DC supply or battery capable (not included).
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Classic Analog Bass Preamp
Classic Analog Bass Preamp Top Panel Features
1. INPUT: The signal output from an
instrument (active or passive) may
be connected to this 1/4" input by
means of an unbalanced shielded
instrument cable.
NOTE: There is a –15 dB pad jumper
located inside of the pedal. Details
on switching the jumper may be found
on page 7.
NOTE: Unplug the input cable when
not in use, as the 9V battery will drain
(and eventually die). Details on replacing
the battery may be found on page 7.
2. CLASSIC PREAMP SWITCH:
Engage this switch to activate
the Classic Preamp pedal. This pedal
is true bypass meaning the signal
will pass through from input to output
with no circuitry in between when
the switch is disengaged.
3. ON/OFF LED: This LED illuminates
purple when the pedal is engaged.
4. VOLUME: Use this to control the overall
output level. Use it wisely, and turn it
down when making connections or trying
something new. Unity is at 12:00.
NOTE: The volume control is active
only when the pedal is engaged.
5. BASS: Use this to adjust the low
frequency level. This provides up
to 7 dB of boost, or 20 dB of cut
at 40 Hz. The low frequency output
is flat at the center position.
6. ULTRA LO: This switch, when engaged,
enhances the amount of low-end output
by 2 dB at 40 Hz and –10 dB cut at
500 Hz.
7. MID: Use this to adjust the midrange
frequency level. This provides up
to 5 dB of boost, or 11 dB of cut
at 500 Hz. The midrange frequency
output is flat at the center position.
6
9
Rotate the control counter clockwise
for a “contoured” sound (more distant,
less midrange output) or clockwise
for a sound which really cuts through.
8. TREBLE: Use this to adjust the high
frequency level. This provides up
to 10 dB of boost, or 10 dB of cut
at 4 kHz. The high frequency output
is flat at the center position.
9. ULTRA HI: This switch, when engaged,
enhances the amount of high-end output
by 7 dB at 8 kHz.
10. OUTPUT: Typically, this 1/4" output
jack connects to the input of an
external power amplifier – or powered
loudspeakers, as long as they have
their own input controls to adjust
the volume level – by means of an
unbalanced shielded instrument cable.
However, it may be connected to an
external mixer, recorder, or interface.
In this way, you do not have to mic the
speaker cabinet in order to add it to the
main mix, or to record. The level of the
signal is affected by the volume control.
54
87
110
3
2
5
Classic Analog Bass Preamp
Classic Analog Bass Preamp Rear and Bottom Panel Features
11. POWER CONNECTOR: This is where
to connect the optional power supply.
Before plugging in the power supply,
make sure that you are using the correct
one for your country (see below).
NOTE: A power supply may be purchased at
your local Ampeg Dealer or ordered directly
from LOUD Technologies Inc. Be sure to ask
for part number:
2045758-00: United States
2045758-01: Europe
2045758-02: Japan
2045758-03: United Kingdom
2045758-04: Australia
2045758-05: China
2045758-06: Brazil
BOTTOM PANEL ACCESS
A –15 dB pad jumper is located inside
the bottom of the pedal. This is also
where the 9V battery is housed.
Removing the bottom is easy. Simply
start by placing the pedal top down
on a soft, dry cloth.
Remove each of the four screws
by turning them counter-clockwise.
Be sure to keep them in a safe place
as you will need them again!
11
6
Classic Analog Bass Preamp
Classic Analog Bass Preamp Bottom Panel Features
12. 9V BATTERY
The Classic Analog Bass Preamp may
be powered by 9V battery instead
of using a power supply. As seen in
the illustration below, it tucks in nicely
inside a compartment of the circuit
board next to the edge of the pedal.
NOTE: Unplug the input cable when
not in use, as the 9V battery will drain
(and eventually die).
NOTE: When replacing the bottom
of the pedal, line up the rectangular
foam piece over the battery. Turn
the screws clockwise to affix to
the bottom to the pedal.
12
13
–15dB
NORMAL
PIN1>>
Ok, ok...there could be no jumper,
but that just sets the pedal to its
normal/default [pins 1-2] setting
(with about 1/2 dB loss).
Referencing the diagram to the left, slide
the jumper out then back in on the pins
that you want to use for your instrument.
Fingers should work just fine, but it’s ok
to use needle-nose pliers to remove the
jumper, if necessary.
NOTE: When replacing the bottom of
the pedal, line up the rectangular foam
piece over the battery. Turn the screws
clockwise to affix to the bottom to the
pedal.
NOTE: If you are experiencing
excessive distortion – distortion begins
at approximately 0.5 Vrms – then you
might want to utilize the 15 dB pad
by moving the jumper to pins 2-3.
13. –15 dB PAD JUMPER
Moving the –15 dB pad jumper
reduces the input signal by 15 dB
and compensates for higher output
instruments. This attenuation is suited
for use with basses that have active
electronics or high-output pickups.
There are only two possibilities.
The jumper can be on:
Pins 1-2 [Normal – default] or
Pins 2-3 [15 dB pad]
7
Classic Analog Bass Preamp
Classic Analog Bass Preamp Suggested Settings
* Volume to taste
= Switch engaged (down)
= Switch disengaged (up)
8
INPUT
Block Diagram
Classic Analog Bass Preamp
OUTPUT
BASS TREBLE
MIDRANGE
CIRCUITRY
TONE CONTROL
VOLUME
15 dB PAD
[INTERNAL]
HI
ULTRA
LO
ULTRA
TRUE BYPASS
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Classic Analog Bass Preamp
CLASSIC ANALOG BASS PREAMP TECHNICAL SPECIFICATIONS
Signal to Noise Ratio 75 dB
(50 Hz @ 300 mV RMS)
Maximum Gain +18 dB
Tone Controls Bass: +7/–20 dB @ 40 Hz
Mid: +5/–11 dB @ 500 Hz
Treble: +10/–10 dB @ 4 kHz
Ultra Hi: +7 dB @ 8 kHz
Ultra Lo: +2 dB @ 40 Hz / –10 dB @ 500 Hz
Impedances Input: 1 M
Output: 120
@ NORMAL, 83 k w/–15 dB PAD
Power Requirements Internal: 9 V Battery
External: 9 VDC, ≥20 mA
Size (H x W x D) 2.2 in x 2.6 in x 4.5 in
56 mm x 66 mm x 114 mm
Weight 0.6 lb / 0.3 kg (approximately)
Service Information
I
f you are having a problem with your Classic Analog Bass Preamp, you can go to our
website (www.ampeg.com)
Support at 1-800-898-3211
to receive assistance. If you are outside of the U.S., contact your local distributor for
technical support and service.
The Classic Analog Bass Preamp is housed in a corrosion resistant die-cast zinc chassis, so be sure
to clean it with a dry lint-free cloth. Never spray cleaning agents on the Classic Analog Bass Preamp.
Avoid abrasive cleansers which would damage the finish.
and click on Support for service information, or call Technical
Monday-Friday during
normal business hours, Pacific Time
,
Ampeg continually develops new products and improves upon existing ones. For this reason, the specifications
and information in this manual are subject to change without notice.
“Ampeg” is a registered trademark of LOUD Technologies Inc. All other brand names mentioned are trademarks
or registered trademarks of their respective holders and are hereby acknowledged.
www.ampeg.com
16220 Wood-Red Road NE • Woodinville, WA 98072
10
©2016 LOUD Technologies Inc.
Part No. SW1193 Rev. A 12/16
Classic Analog Bass Preamp
Owner’s Manual
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