EDEN® - Eden Amps
Owners Manual
Bass Guitar Amplifier
001/15/2010 by U.S. Music Corp.
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
loudspeakers and/or additional amplification 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 bass guitar
product. This unit has been designed and
constructed to give you years of trouble-free service.
Please take the time to review this manual
and to send in your warranty registration card.
Bass Guitar Amplifier
Publishing Date 01-15-2010
Congratulations on the purchase of your new WTB-400 Integrated
Amplifier System. All of us at Eden are totally committed to providing
vou 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 amplifiers the most musical and reliable Bass amplifiers
This manual will cover domestic and international versions of the WTB-400
Integrated Amplifier,
The WTB-400 delivers 275 Watts RMS output @ 8 Ohms, 400 Watts (à 4
Ohms, and Watts(@ 2 Ohms, all with +3dB of headroom. This amplifier
also features a thermostatically controlled, active cooling system with
built-in thermal safeties.
You have purchased what we feel 1s one of the finest bass amplifiers
in its class. The pre-amplifier section, with 1ts familiar Eden Enhance
control and powerful semi-parametric tone control system is coupled to a
gentle auto-compression circuit, allowing you to achieve a wide array of
sounds. This compact, rack mountable package houses modular circuits
made with superior components and designed for years of trouble-free
The products group is the result of our quest for ultimate bass
tone and maximum reliability. Your amplifier was designed, engineered
and manufactured equivalent to aircraft vibration standards and housed
in a welded steel chassis with steel top to ensure maximum reliability.
The modular design allows quick repair in the field should such a need
Input Jack Designed to accept a standard l4 inch mono phone plug. For
best results use a high quality shielded cable to connect your instrument
to the amplifier. The input is buffered and will handle standard passive,
high level active, and piezo input signals.
Gain Control Regulates the first gain stage of the preamplifier and
controls the amount of signal available to the system.
Input Pad Pull slightly on the Gain control to engage a 1 2dB pad. This
feature is useful when using a very high gain instrument.
Set Level Indicator This light helps the user set the appropriate amount
of gain. When set properly, the indicator should light on your
loudest/lowest notes. We'll go over this in more detail later in the manual.
Compressor Bypass Switch This switch allows you to bypass the front
end Compressor/Limiter, The Compressor/Limiter in your unit is a fixed
threshold type. You adjust the Compression level by turning the gain
control up or down until you get the amount of compression you want.
You may find the bypass switch useful for getting that maximum punch
when you are slapping or popping hard.
Enhance Control Called the "Magic Knob” by some, this complex
control simultaneously boosts the very low bass, upper middle, and high
frequencies while putting a dip in the lower middle frequencies.
It 1s flat when set to its minimum level (fully counterclockwise).
Enhance Bypass- This feature 1s activated by the foot switch . It allows
you to set up a separate tone that you can switch in and out with the foot
Semi-Parametric Equalizer Allows you to dial in a specific frequency
to enhance or cut, This feature 1s especially useful for upright and
acoustic bass guitars that have a resonant frequency. Because we've
included a bypass switch, you can also use it to create a second tone that
1s available instantaneously. (You're welcome.) The frequency 1s
adjustable from 40Hz to 10KHz. The level can be adjusted +/- 15 dB. The
control 1s FLAT when the level control 1s at 12:00 position (straight up).
The line of amplifiers is the result of our research and
development in combining high performance and compact size. Just as a
skilled craftsman needs good quality tools that won't let him down on the
job, so does a good musician. We hope you enjoy the tool we've created
for you. Have fun; play low!
Please read this manual in its entirety before operating your new
amplifier. Failure to do so could result in misuse or damage. We've taken
the time to write it, which was a lot longer than the time it will take for
you to read it. Help us help you by taking a few moments to learn how to
properly use your new amp. You'll be glad you did!
Please complete for your records:
Date of Purchase:
Serial Number:
Three Band Tone Controls Divides the audio spectrum into three bands:
Bass, Mid, and Treble. The Bass and Treble controls are shelving type
filters. The Mid control is a band pass type filter. These controls give you
a broad general control ofthe tone shaping.
Master Volume Controls the main stage sound level and the Head Phone
Headphone Jack Accepts a standard 1/4 inch stereo or mono headphone
plug. It can also be used as a Master Output send to slave another
DC Indicator When lit, shows that the low voltage power supplies are
Mains On/Off Switch This switch turns the system power ON or OFF.
The switch illuminates to indicate the presence of AC power present in
the chassis. This switch is prior to the fuse. The light in the switch may
flicker depending on local voltage conditions. This is normal and nothing
to be concerned about.
NOTE: The Mains Switch will illuminate even if the fuse is blown.
However, the DC Indicators will not illuminate if the fuse is blown.
IMPORTANT NOTE: When attached, the included lighted footswitch
will defeat the Front Panel controls for the Mute to Tune and Enhance
Bypass functions.
Amplifier Power Rating:
RMS output (with +3 dB headroom):
225 Watts (@ 8 Ohms
400 Watts (4) 4 Ohms
Watts (à 2 Ohms
Cooling System Your amplifier features a thermostatically controlled
fan, which will switch on when the internal temperature reaches 130
degrees F. In low volume situations (into 8 Ohm loads) the fan may not
come on at all.
The cooling system also features a high temperature thermal safety
system, which will activate a circuit if the operating temperature goes
above 200 degrees F. This circuit will automatically turn off the output of
the system in the event of overheating. It will automatically reset itself
as soon as the unit cools down to a safe operating temperature.
NOTE: the D.I. will continue to operate normally even when the
amplifier is in thermal safety mode. Only the stage sound will be lost.
IMPORTANT NOTE: Excessive heat is a Very Bad Thing and can
resultin severe damage to your amplifier. DO NOT bypass or
disconnect any part of your thermal safety system. Doing so will
immediately void your warranty!
Combination Power Cord Jack and Fuse Holder The removable
power cord is attached here. To access the fuse holder, pull the holder out
of the top of the power receptacle. Your unit was shipped with a spare
fuse inserted in the fuse carrier. USE ONLY THE SAME SIZE AND
TYPE FOR REPLACMENT, Using a fuse with a different rating
than specifiedisa VERY BAD THING and can cause damage to your
amplifier. All models come with a holder marked (FUSE) or (115/230)
and are factory configured for 100/120/ 230/240 only and must be
adapted by a service tech for any voltage change.
Fuse Requirements:
[email protected] 120 Volts /60 HZ 4 Amps, 5x 20 mm GMC/T/slow blow
Europe (@ 240 Volts/50 Hz 2 Amps, 5 x 20 mm GMC/T/slow blow
Japan (@ 100 Volts/60 Hz 5 Amps, 5x20 mm GMC/T/slow blow
IMPORTANT NOTE: Always use slow blow or time delay type fuses.
Do not use fast blow fuses.
To convert your amplifier from US to European fusing contact a
technician to do this for you.
IMPORTANT NOTE: In order to operate properly in other parts of
the world, your amplifier may require minor modifications. These
modifications should be made by a QUALIFIED technician. Contact
your local distributor for further information.
Once you've ensured correct voltage, set the Master Volume control to
minimum (fully counter-clockwise). Set the tone controls to the center
position (12:00 or 0). Turn the Enhance control to the minimum position.
Set the Input Gain control to the minimum (fully counter-clockwise). Set
the Compressor to the OFF position (push the switch IN). This will set
your amplifier up flat and with the Compressor disengaged. 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, Double check that all connections and
switches are correct for your chosen mode of operation.
Turn On Once you've completed the steps above, you can plug in your
bass and turn on the unit (plug it in first, ok?) and let's get started. We
recommend turning your system on with the Master Volume control set to
its minimum position. This will prevent any unexpected signal from
being sent to your speakers.
Setting Your Level Remember, begin with the Input Gain, Enhance,
Compressor and Master Volume completely OFF fully counter-
clockwise. All EQ should be set flat, that is, at 12:00 straight up.
While playing your lowest note (or loudest), slowly turn the Input Gain
up until the Set Level light begins to blink with regularity. If you go past
2 or 3 o'clock, you may engage the Input Pad (pull the Input Gain knob
OUT) to better match the gain of your instrument to the amplifier.
If you have disengaged the Compressor as we suggested, the Set Level
light will barely blink on your loudest notes when you reach clipping in
the Input stage. We recommend you decrease gain one or two clicks to
ensure there 1s no clipping in the system.
Once you have properly set your Input Gain, turn the Master Volume up
to a comfortable listening level and proceed with the rest of the setup
Setting the Compressor - If you want to use compression, engage it now
by turning the Compressor Defeat switch OFF. The compressor light will
now blink when your gain goes above the compression threshold. This
will generally show up more on the lower notes, or when you employ
Slapping. (A properly compressed Slap sound 1s very cool, indeed.) If
you want more
Speaker Outputs These consist of two 1/4 inch jacks and two NL-4
connector (sometimes called a Speakon). The jacks are wired in parallel.
The total speaker load impedance should not go below 2 ohms. On NL-4
connectors, we use +1, -1 connections.
D.I. Level Controls the level being sent from the XLR balanced output
jack. We suggest setting the control at approximately 12 o'clock initially.
If the signal to the board is too hot, it's better to engage the Input Pad on
your channel of the board than to turn it down here, if at all possible. In
general, it's better (in terms of signal-to-noise ratio and dynamic
presentation) to send as hot a signal as possible to the board. However,
you can adjust the signal level, if necessary, so make sure your
soundperson or recording engineer is aware of this capability,
Ground Lift Switch This switch lifts the ground within the balanced
output system to allow you to eliminate excessive noise/ground loops
when connected to external systems.
Recording Out (D.1.) This fully balanced XLR output allows you to
senda pre- or post-EQ signal to a recording or sound reinforcement
mixing console. We use Pin 2 hot configuration, Adjusting the Master
Volume control will not affect this send. This output is designed to use
with phantom powered systems. However, 1t never hurts to turn off the
phantom power at the board, if possible.
Mono Pre-EQ Effects Send/Return These standard 1/4 inch jacks allow
you to send and receive your signal to and from external devices. This
effects loop is positioned post (behind) the compressor and before the
Enhance control and the tone section. This loop is at line level; do not use
instrument level effects in this loop as they tend to be overloaded by the
higher signal level which can cause distortion.
Tuner Out Jack This standard 14 inch jack is designed to provide a pre-
gain signal for connection to a tuner. It can also be used to provide pre-
tone signal to other devices such as a direct box or console. The signal is
enough to provide adequate signal to virtually every tuner on the market.
compression, increase the Input Gain a little at a time, until you achieve
the amount of compression you desire.
The frequencies that you'll need to boost or cut are dependent upon your
instrument, playing style, speaker cabinets, and venue. Extreme settings
of boost or cut are unlikely to be necessary or helpful. We are frequently
asked to provide suggested settings for various styles of play. We have
discovered though, that most of our endorsers tend to set their EQ
generally flat, using varying amounts of the Enhance Control to achieve
their sound. In fact, a number of our recording artists tell us that their
standard recording set-up is to have the Enhance set at approximately 9
or 10 O'clock and the tone controls set flat.
Enhance Once you've set your gain, you can move on to setting your EQ,
beginning with the Enhance control, or Magic Knob, as some call it. The
Enhance circuitry adds very low bass, upper mids and highs while
scooping out a bit of low middle. The more Enhance effect you dial in,
the greater the boost (and cut). As with all of our EQ controls, a little
goes a long way.
Slowly bring the Enhance control up while playing. If you turn it up close
to 12:00 on the dial and still don't have your sound, stop there. Return the
Enhance to OFF or leave it at no more than 12:00 and work with the EQ
Using the EQ Controls Before you begin to twiddle knobs, let's talk
about a few things. Excessive boosting of one or more EQ frequencies
may cause an overload in the EQ section. If this happens, the EQ Clip
light will engage. This is a Very Bad Thing and needs to be corrected
Remember, too, that our EQ controls are active, and are meant to turn
both ways not just UP! This means that you can enhance a certain
frequency spectrum either by boosting that frequency or by cutting the
adjacent frequencies. This latter method has the advantage of
maximizing potential headroom.
If possible, step well forward of your rig to get a better idea of how you
will sound in the room. You may be surprised at how different you sound
once you step away from the speakers.
Mechanical and Thermal Issues During operation, your amplifier
should always be placed away from sources of moisture or heat, Care
should be taken not to obstruct the ventilation holes on the bottom and
sides of the unit, In the event of thermal shutdown, you should eliminate
the cause of the thermal problem (poor ventilation, speaker loads lower
than 2 ohms) immediately. The supplied rack ears can be used to install
your amplifier in a conventional equipment rack for protection during
Electrical Connection The WTB-400 requires at least 10 Amps of correctly
wired alternating current for proper operation. Providing less than 10
Amps of power may result in poor amplifier performance, so it's probably
not a good idea to plug all of your band's gear into a single wall outlet.
Connections All instrument-level input connections (everything but the
speakers) should be made with high quality shielded cables. The use of
speaker cables for input connections will result in excess noise. Speaker
connections should be made with high quality 16 gauge or heavier
unshielded speaker cables. We recommend 10 or 12 gauge cables. The
use of shielded line or instrument cables for speaker connections can
damage your amplifier. The speaker cable should be as short as possible.
As bassists, each of us has in our head a concept of our perfect sound.
Eden amplifiers are designed to help you easily achieve the sound you
hear inside vou. However, it's a multi-step process as explained below.
In order to ensure the ultimate in tone, it's important to follow the
procedure outlined below. Don't skip steps; don't jump around. Yes, this
may take a minute or two, but the work is well worth it. Once they've done
Ita few times, most users can do it time and again in about a minute.
IMPORTANT NOTE: 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 county of operation.
NOTE: Many players rely on the Enhance Control (and perhaps a little
Midrange Massage) to get their sound. This method leaves the Bass and
Treble controls available to dial in to a particularly difficult room. Just
something to keep in mind, ok?
Setting Bass Mid, and Treble OK, now it's time to set the EQ,
beginning with the Bass and Treble controls. These controls cover a
fairly broad frequency spectrum and a little goes a long way. Adjust these
controls up or down as needed. We suggest playing a few notes in various
areas of the neck so you can hear what your adjustments have done across
the fretboard.
Using the Semi-Parametric EQ Controls Adjusting the Semi-
Parametric control set allows you to focus in on particular frequencies to
achieve your desired tone. We suggest you spend some time
experimenting with these controls to learn more about how they can
affect your sound. Here's an easy way to do that:
Begin with the frequency control fully counterclockwise. Turn the Level
control to approximately 9:00. Now, while playing, rotate the frequency
control to the right a little at a time. You should be able to easily hear the
frequencies this first set of controls affects.
Now, cut the Level control to approximately 3:00 and do the same thing,
Here are a couple of tips to help you dial in your desired tone:
For a great fretless tone, dial in a little extra at approximately 550Hz.
For extra grind for Rock and other aggressive music, add a little at | -
1.2KHz or 2-2.2KHz or both! Remember, though, that a little goes a long
way. Don't over boost.
NOTE: Remember that the tone you get when playing alone may not cut
through as well as you'd like when playing with others. You may need to
adjust the tone controls to achieve the same (apparent) tone, especially in
the mids and high end.
Clipping = Bad Keep an eye on the EQ Clip light. If it blinks, either
reduce Input Gain or cut back on one or more EQ ranges. As we said
earlier, Clipping in the preamp section 1s a Very Bad Thing and is to be
avoided at all times. If you find yourself running out of amplifier
headroom, cut a little in the lower frequencies, which require the most
power from your amp. You'll know this is happening if you see the Limit
light flashing. As long as the light 1s just blinking, you're fine. But, if it's
on more than it's off, you might want to back off a bit.
Frequency Oddities Two areas are a frequent source of frustration for
bassists trying to achieve their sound: frequency masking and frequency
enhancement. Frequency masking occurs when other instruments
(particularly cymbals and electric guitars) obscure the important upper
harmonic content of your sound. As a result, you find that the EQ settings
that were so perfect at home lack definition in a live setting. On the other
hand, the stage settings that worked so well sound harsh and/or thin in the
absence of other instruments.
Frequency enhancement results from cabinet placement and room
acoustics. A cabinet placed on the floor will have the lower frequencies
boosted by about 3 dB. Placement against a wall adds another 3 dB. A
corner adds 3 dB more. Consequently you may find a surprising
boominess to your sound. Certain qualities in the room itself can also
enhance the lower frequencies, further contributing to this problem.
Frequently this effect 1s more noticeable in the audience than it 1s on
stage. Compensating for it may resultin a stage sound that may seema
little thin. However the sound 1s actually quite full out in front.
NOTE; Remember, you can't equalize out major physical room
anomalies. If things sound really weird where you are, try moving you rig
a few feet and see if that helps. This may be particularly helpful on saggy
stages that bounce like a drum head.
There you have it: a quick and easy process to help you get the perfect
tone from your amplifier. As previously mentioned, 1t make take
a few extra minutes the first few times you go through this, especially if
you take
Service Inthe event of amplifier malfunction, or questions about your
unit's operating features that aren't answered in this manual or on our
website, you should contact your Dealer. Once you and your dealer have
determined it's definitely a malfunction (and not an operator error) you
must call our Customer Service Department and obtain a Return
Merchandise Authorization (RMA). We WILL NOT accept any gear
sent without an RMA, so save the time and money by calling first, ok?
IMPORTANT NOTE: International customers should contact their
local distributor for warranty information. All warranties are
honored in the country of purchase.
If you have problems, please call the USM Customer Service Dept. at:
1-800-USSOUND (1-800-877-6863)
When you hear the voice prompt, Press 1 on your phone's keypad.
Email Website
eden(deden-electronics.com http://www.eden-electronics.com
(847) 949-0444
(847) 949-8444(fax)
Eden Electronics
C/O U.S. Music Corp.
444 E. Courtland Rd.
Mundelein, IL 60060
Eden Never Compromise™
the time to experiment with all the knobs and switches. which we highly
We are confident that the time you spend getting to know your new friend
1s an important investment, one that will pay off immeasurably in Great
Bass Tone. And. after all, that's why you bought a Eden, right?
Suggested Speaker Systems Your speaker system should be chosen to
accommodate the characteristics of your amplifier and your predominant
application. If you will only be using one cabinet, a4 Ohm model will
draw the most current from your amplifier. If you will generally be using
two cabinets, they should both be 8 Ohm models so their combined
impedance will be 4 ohms. If you are uncertain about your future needs,
always go with the $ Ohm speaker option so that you can add another
speaker later 1f you need to. In general, adding more speakers will give
you a greater volume increase than adding a few more watts.
Headphone Jack as a Line Driver On some occasions (such as high-
volume or outdoor situations) it may be desirable to use the WTB-400 along
with an additional power amplifier and added cabinets. A standard
shielded instrument cable may be used to connect from the headphone
jack of the unit to an unbalanced input of a standard power amplifier.
This will provide a signal that 1s post-EQ and after the Master Volume
control, allowing the entire system to be controlled from the WTB-400. This
way, you only have to adjust one set of knobs. This 1s a Really Neat
Thing, huh?
Using the WTB-400 Without Speakers -This amplifier 1s designed to be
used safely with headphones only, without the loud speaker plugged in.
No harm will result from using the amplifier in this fashion. This allows
the use of the unit for practice with headphones and as a preamplifier
with other amplifiers. Neighbors and room mates really love this, which
qualifies it as another Really Neat Thing.
Your amplifier has been designed to require minimal routine
maintenance. Attention to the following areas will ensure optimum
performance of your amplifier. We're serious. Don't blow this off, OK?
Tha lightning fash with armowhesd
symbol, within an equilateral triangle.
#6 intended lo alert tiva user to tha
presenco of uninvulaed "dangerous
volaga" within the product's enclosure
that may bo of sudficion magnitude
lo congtituté a risk to persons
The exclamation port, within dr
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important operating and
maimlordnée (BerviCing) MEruchons
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Read ihese instruction.
Keep these instructions:
Heed all warnings.
Follow all instructions,
Oo not use this apparatus near water.
Clean only with a dry cloth,
Do nod block any ventilation openings. Install in accordance with the manufacturer's
Do not install near any heal sources such as radiators, heal registers, stoves. or other
apparatus [including amplifiers) а! produce heat.
9. Do nol defeat the safely purpose of the polanzed or grounding-type plug. A polarized
plug has wo 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 particulariy at plugs.
convenience receptacles. and the point where they exil from the apparatus.
11. Orly use atlachments/accessories specified by the manufaclurer.
12. Usa only with a carl, stand, tripod, brackel, or table specified by the
manufacturer, or sold with the apparatus. When a car is used, use
caution when moving the cart/apparatus combination fo avoid injury
from Ep-cver,
13. Unplug this apparatus during lightning storms or when unusad for
long periods of time.
14. Refer all servicing to qualified service personnel, Servicingis
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 lo rain or moislure,
does not operate ormally, or has been dropped.
=D el
WARNING- To reduce he risk of fire or electric shock, do not expose (his apparatus to
rain of moisture. The apparatus shall not be exposed to dripping or splashing and that objects filed
WARNING- The mains plugfappliance couplers used as disconnect device, Ine disconnect
device shall remain rediy operable.
WARNING- The apparatus should be connected to a mans socket outlet with a protective
earthing connaclion.
Avertissement: pour réduire le risqué d'incendie ou de choc électrique, ne pas
exposer cét appareil sous la pluie @t l'humidité
La prise du Secteur est utilisé pour déconnecter le système.
La prise du secteur ne dôil pas être obstruée où doit être facilement
accessible pendant son utilisation
Four bire complétement déconnecté de l'alimentation d'entrée
la prise doit être debranchée du secteur
Contact Point Cleaning One of the weakest links in most bass
amplification systems are the solderless connection points where
instruments, speaker cabinets, effects, and other devices are connected to
the amplifier. (The most vulnerable of these types of connection 1s the
jack on your instrument). In addition to contamination from airborne
pollutants, these points are frequently assaulted by connectors that have
picked up debris from dirty stages, cases, etc.
This contamination can result in poor contact as well as poor tone, and
we all know that bad tone is a Very Bad Thing. These points should be
cleaned regularly with a cotton swab soaked in denatured alcohol ora
commercially available de-oxidant. Frequent cleaning of the plugs on
your cords 1s also recommended.
Dust Removal Youshould periodically inspect the ventilation openings
on the top and sides of the unit to ensure that they have not become
blocked by accumulated dust. Vacuum the openings to remove any dust
buildup. Dust bunnies are definitely not cool.
The Magic Smoke Few people realize just how much magic goes into
creating Great Bass Tone. It isn't something you normally need worry
about. Just have fun and leave all that to us. However and this is very
important if you ever release the Magic Smoke from your amplifier this
1s indeed a Very Bad Thing, perhaps the worst thing you can do. If vou
see any smoke (Magic or otherwise) coming out of your amplifier,
immediately turn it off and seek the services of a qualified
magician...uhm, we mean...echnician. DO NOT continue to use the
amplifier in this condition.
Learn More If you'd like to learn more about your amplifier (or about
our company and its activities), we invite you to visit our website
www.eden-electronics.com. There you'll find articles to help you better
understand our products and the technical stuff some people find so
interesting. You'll also find our FAQ (Frequently Asked Questions) file,
which is updated regularly,
While you're there, check out our on-line forum. There you can meet
hundreds of other Edenites who'll be glad to help you with any questions
you may have about our gear. Not to brag too much, but we think our
forum is a Really Neat Thing, filled with Really Neat People. We're
pretty sure you'll think so, too.
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