Eden Nemesis Silver Series NA120 User manual

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Nemesis Silver Series
Owners Manual
NA120 / NA80
Bass Guitar Amplifier Chassis
For Silver Series Combos
Covering Models
N10S(E), N12S(E) N15S(E), N28S(E)
3/15/2005 U. S. Music Corp.

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NA120 / NA80
Bass Guitar Amplifier Chassis
For all Nemesis Silver Series Combos
Models N10S(E), N12S(E) N15S(E), N28S(E)
OPERATION MANUAL
Publishing Date 3-15-05
Foreword
Congratulations on your purchase of your new lightweight Nemesis
Silver Series Combo Amplifier System. All of us at Eden are totally
committed to providing you with the very best bass guitar systems in
their class.
Our goals are to offer you the outstanding performance quality of a top-
notch, professional bass amplification system at a reasonable price
point, and to make the Nemesis Silver Series line such a great value
that you really can't afford not to own one.
This manual will cover all versions of the Nemesis Silver Series
Combos. These include the N10S(E), equipped with the NA80 amplifier
unit, and the N12S(E), N15S(E), and N28S(E) models, which are
equipped with the NA120 amplifier unit. The (E) version is the Export
version; however, both units are identical in operation.
The NA80 has 90 watts @ 8 Ohm, 120 watts RMS @ 4 Ohms and the
NA120 has 130 watts @ 8 Ohms, 170 watts RMS @ 4 Ohms. Both have
+3dB of headroom and feature large passive cooling systems with built-
in thermal safeties.

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The Nemesis Silver Series products group is a revolution in bass guitar
equipment and manufacturing technology. We have taken FET power
device technology, computer-optimized circuit design, and years of
research and testing to evolve our latest electronics package: the
NA80/120. This is a great step forward in performance, reliability, and
value.
We build the Nemesis Silver Series enclosures from void-free, high
quality plywood. The chassis is mounted with 6 mounting bolts to insure
reliability under the most difficult conditions.
The Nemesis Silver Series Combo line is the result of our research and
development in combining high performance and compact size, together
with lightweight construction and great value. It offers a great
performance value for the bass student, teacher, and the working bass
player alike. A skilled craftsman needs good quality tools that won't let
him down on the job, and so does a good musician.
CAUTION!
Your ears are your most important piece of equipment.
Unfortunately, they cannot be replaced as easily as your other
gear. Please take the following warning seriously.
This product, when used in combination with amplification and/or
additional loudspeakers may be capable of producing sound levels
that could cause permanent hearing loss. DO NOT operate at high
volume levels or at a level that is uncomfortable. If you experience
any discomfort or ringing in the ears or suspect hearing loss, you
should consult an audiologist.
Thank you for your purchase of an Eden Nemesis Series bass
guitar product. This unit has been designed and constructed to
give you years of trouble-free service.

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Please take the time to review this manual and to send in your
warranty registration card.
GENERAL FEATURES
Your Nemesis Silver Series Combo has all the following features: a 90
to 130 watt FET power amplifier @ 8 Ohms, dual channels, heavy duty
passive thermal cooling, extension speaker compatibility, automatic
thermal protection circuit, compressor/limiter with in/out switch, aux
channel with tone and level controls, enhance control, 3-band tone
control, speaker on/off switch, headphones jack, aux speaker output, full
D.I. with ground lift switch and level control, effects loop, all plywood
enclosure, and powerful, great sounding Eden designed loudspeakers.
SET UP AND GETTING STARTED
Before turning on your Nemesis Combo, you need to do a few things
first. If your unit was shipped directly to you from a dealer, check
carefully for hidden freight damage before you attempt to operate the
unit. If you find any damage, notify your dealer and the freight line
immediately. If you picked up your unit from your dealer, it was probably
set up and tested out already. To be safe, we suggest that you go
through the set up now.
INITIAL SET UP
Before you plug in your unit for the first time, please do the following
things. First, turn the power switch to the off position. Check the back of
your unit for the correct voltage notation for your country of operation.
Once you’ve ensured correct voltage, set the master volume control to
minimum (0). Set the tone controls to the center position (12:00 or 0).
Turn the enhance control to the minimum position. Set the gain control
to approximately the 10:00 position. Set the compressor in the on
position. On the front of the unit, set the internal speaker switch in the on

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position. This will set your amplifier up flat and with the auto compressor
operating. Next, plug in the power cord to the AC inlet on the back of the
unit. Use only a safe grounded receptacle for proper operation at the
correct voltage for your country. Double check to make certain your
amplifier is set for the correct voltage in your country.
Once you’ve completed the steps above, you can plug in your bass and
turn on the unit. Turn the master up until you reach a comfortable sound
level and we will go through the tone controls and other features.
OPERATION & DESCRIPTION of CONTROLS
INPUT JACKS
The input jacks on both channels will accept most bass guitar output
levels. If you have a dual-battery bass with output in excess of +10dB,
you will probably have to turn the output of your bass down to avoid
clipping the input. The jacks will accept most passive and active basses.
The aux jack will accept RCA connectors so you can connect a CD or
tape player.
LEVEL CONTROL Aux Channel
This control regulates the aux channel and controls, the level sent to the
output master gain control. You can use this channel to plug in a second
instrument or a CD/tape player – a great feature for students and
teachers. For most applications, you should set the control between 9:00
and 3:00 to match your instrument and playing style to the amplifier. The
CD/tape player inputs are RCA-style inputs.
TONE CONTROL Aux Channel
This is a tone balance control. It shifts both high and low frequencies at
the same time. It acts rather like an audio teeter-totter. It allows a quick
EQ of the entire audio spectrum on one control, and is highly effective
for matching different recording formats and balancing instruments.
GAIN CONTROL Main Channel

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This control regulates the first amplification stage and controls the gain
of the first stage in the overall system. The compressor automatically
tracks the input level and follows the gain. This is a fixed-threshold type
compressor. You control the compressor threshold by setting the gain
higher or lower; depending on how much compression effect you want.
The compressor is also provided with a bypass switch to defeat the
compressor operation if desired. For most instruments, you should set
the control between 9:00 and 3:00 to match your instrument and playing
style to the amplifier.
-12dB PAD Main Channel
Some of the dual battery powered bass guitars have unusually high
output levels. If you own one of these basses, it may be necessary to
engage the -12dB pad in order to properly match correct signal levels
with this unit. The pad is engaged by pushing in the pad switch. This will
reduce the input signal level by approximately –12dB.
ACTIVE LIGHT and COMPRESSOR ON/OFF SWITCH Main channel
The compressor on/off switch engages and disengages the compressor.
Pushing in the compressor switch activates the compressor. The light
indicates the best spot to operate the amplifier. When the compressor is
engaged, the light indicates compressor operation. When the
compressor is bypassed, it indicates the sweet spot for operating the
amplifier.
ENHANCE CONTROL Main Channel
This is a great sounding feature, seldom found on amplifiers in this price
range. The enhance control is a complex tone pre-shaping curve that is
set up to optimize your bass sound. It is designed to boost the low
frequencies and upper midrange, while at the same time reducing the
lower midrange frequencies. The enhance control is a quick and easy
way to a quality bass tone. To try it out, set all the other tone controls to
flat. Then rotate the enhance control between 9:00 and 11:00 for the full
effect. This range is typically the best area for operation. The enhance

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can also be used with the other tone controls.
MAIN TONE CONTROL 3-BAND EQ Main Channel
The main tone control section is a 3-band tone equalizer. The audio
spectrum is divided into three bands, the bass, mid, and treble. The
bass and treble are shelving type filters and the midrange control is a
band pass type filter. These controls give you a broad general control
range for shaping your tone.
MASTER LEVEL CONTROL
This control sets the final output level to the amplifier. For general
operation, the control will normally be set between 9:00 and 3:00.
HEADPHONE OUTPUT/ Aux. Line Out
This jack provides the output for headphones that are used for
practicing. If you switch off the internal speaker, you can use your
amplifier to rehearse with just the headphones. It can also be used as an
aux line level output to run additional amplifiers. This output will function
as the final master control and the additional amplifiers will be slaved to
it.
D.C. INDICATOR
This indicates that both the D.C. power supplies are operating properly
and the amplifier is turned on.
MASTER OUTPUT LIMITER
Your unit has a final limiter/compressor at the output, and it will cause
the amplifier to soft limit at its maximum output. This is a seamless
feature and does not have an output indicator on the panel. It cannot be
defeated.
SPEAKER ON/OFF SWITCH

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This switch turns off your internal and external speakers for quiet
practicing with the headphones.
BACK PANEL FEATURES
AC POWER INLET/ FUSE
This is where you plug in your AC line cord. This is also where the fuse
is located. The fuse for US operation is a 2 amp. 5x20 MM slow-blow
type fuse. In Europe, use a 1 amp @ 240v slow-blow fuse and the
appropriate AC connector for your country. Make certain that your unit is
set for the correct voltage for your country.
Replace your fuse only with the same size and type.
The unit is set at the factory to operate at the correct voltage for your
country. It can easily be changed from the original factory setting to
operate at 100/115/220/230-240VAC. You can change from 230v to
115v by turning over the fuse holder and doubling the size fuse for the
115v operation. Setting the unit for 220VAC and 100VAC operations
require that a jumper be moved in the power supply PC board inside the
unit. Please refer this to a qualified service technician only. There is
serious risk of damage to the unit and potential injury to yourself if
this is done incorrectly.
INTERNAL THERMAL PROTECTION SYSTEM
Your unit is fully protected by an automatic thermal safety system that
meets the UL-813, CSA, and CE standards for safety. If your unit is
played too hard and too long and it accumulates too much heat load, or
if an amplifier malfunction occurs, the thermal safety system may
engage.
If this happens, your unit may temporarily go into the thermal standby
mode. This is a normal operation of the safety system. In the standby
mode, the unit will remain operating and all the pilot lights will stay on,
but the audio output to the speaker will be shut down until the unit
reaches a safe operating temperature. The D.I. will continue to operate

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during the thermal standby. Your unit will come back on automatically in
1 to 3 minutes and operate normally. If the unit continues to cycle
through thermal shutdown, you should contact your local dealer for
service help.
HEAVY DUTY PROFESSIONAL USE
The Nemesis Silver Series Combos are primarily designed for small
clubs and rehearsal venues. The Nemesis Silver Series Combos run
well above normal combo loudness levels. Your unit is designed to be
played hard and to hold up well. However, it is not designed to replace,
or to perform as loudly as, the more powerful Eden separate systems. If
you find you are pushing your amplifier so hard that you are
encountering thermal standby and shut down on more than a very
occasional basis, you are pushing the unit well above the intended
operating parameters and should consider stepping up to a bigger rig.
EXTERNAL SPEAKER OUTPUT
This jack allows you to use an external extension cabinet. We
recommend an 8 Ohm extension speaker. Leave the internal speaker
switch in the on position when using the extension cabinets. Do not
exceed a total minimum load of 4 Ohms.
SPEAKER ON / OFF
This switch turns off the internal loudspeaker and any extension
cabinets. Make certain that this switch is in the on position if you want to
play your unit and hear it on the internal loudspeaker.
EFFECTS LOOP
This is a line level output and return; it is a series circuit. This is the
place to put your line level effects. You can also use the effect send as
an aux line level output. The circuit breaks on the return jack.
DIRECT OUTPUT

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The D.I. output is used to connect your unit to P.A. systems and
recording consoles. This is adjustable from microphone level to a high
line level signal. The level control sets the amount of signal level that
appears at the output of the XLR connector. The ground lift is used to
reduce noise when plugging into another system. Switch the ground lift
back and forth to determine the lowest noise/hum position. This is a fully
balanced line output. Pin 2 is + or hot.
SETTING UP YOUR OWN SOUND
Start by setting the pre-amplifier tone controls to the flat position. Set the
enhance control to minimum. Set the master volume control to 0. Set all
the tone controls to 0. Plug in your bass and turn on your unit. Set the
gain control to around 10:00 and move the master up to around 11:00,
or to a comfortable listening level.
Try the enhance control first, rotate it while playing, and you may find
that this gives you the sound you are looking for.
Next, try the main 3-band tone control. Start with the treble control, work
down to the midrange control, and then adjust the bass control. Be
careful about using large boosts, particularly in the bass range. This can
cause increased distortion at loud playing levels and can limit overall
output level if carried to extremes.
To sum things up, you will always have the best results creating a great
bass tone around the natural tone of your instrument. Use the minimum
amount of EQ required to get your sound.
SPEAKER ENCLOSURES
All speaker enclosures have a passive tweeter protector in the crossover
to protect the tweeter from heavy clipping or unusually large input
signals. This protector bulb will light up if it is engaged. It is located in
the speaker box and is attached to the crossover. To service this part,
should it ever become necessary, the grill must be removed along with
the speaker closest to the crossover.

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SPEAKER BREAK IN
It is recommended that you play for a few hours at low to medium
volume before you push your new combo to the max. This will extend
the life of the speaker system.
FOR YOUR SAFETY
Always use a correctly grounded receptacle for your Amplifier AC
receptacle. If your fuse should ever need replacement use only the
same size and type that came with your unit from the factory. Your unit
comes with one spare fuse in the fuse carrier.
WARRANTY
Your Nemesis comes with a two-year warranty. Please register online.
www.edenelectronics.com/warranty
If you have any questions about your unit or any problems with your unit
please contact your local dealer or distributor for assistance, or contact
us directly by calling 1-847-949-0444 and ask for the Nemesis customer
service department.
The USM service department is open Monday through Friday between
8:30 AM and 5:00 PM. US Music Corp. 444 East Courtland St.
Mundelein, IL 60060 USA.
International customers please contact your local dealer or distributor.
You can also contact us at [email protected] or visit our website at
www.eden-electronics.com