Eden WT1550 Specification

Eden WT1550 Specification
WT-1550 Users Manual
High Power Bass Guitar Amplifier
with All-Tube Preamplifier
©007-14-2005 by U.S. Music Corp.
High Power Bass Guitar Amplifier
WT-1550 Power Amplifier
Publishing Date 07-14-2005
Congratulations on the purchase of your new Eden World Tour 1550 Power
Amplifier. 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 World Tour
amplifiers the most musical and reliable Bass amplifiers available.
This manual will cover domestic and international versions of the WT-1550
The WT1550 delivers 300 watts RMS output @ 8_, 600 Watts @ 4_ and
750 watts @ 2_ into each channel with both channels driven. In Bridge
Mode, it delivers 1200 watts RMS @ 8_ and 1550 Watts @ 4_. At all
impedances, it offers +3dB of headroom. It also features a thermostaticallycontrolled, active cooling systems with built-in thermal safeties.
You have purchased what we feel is one of the finest bass power amplifiers
in the world. The new Tone Control section, featuring individual Bass and
Treble controls for each channel, allows the user to quickly adjust to difficult
rooms. The AGC Limiter and Thermal Safety System protect your amplifier
from potential damage. The compact, rack mountable package houses
modular circuits made with superior components and designed for years of
trouble-free service.
The Eden World Tour products group is a the result of our quest for ultimate
bass tone and maximum reliability. Your new Power Amplifier features our
latest input section, using dual pre-amp tubes to provide unequaled warmth
and tonal adjustment to accommodate varying room acoustics. We believe
the result is more than worth the effort and think you’ll agree.
Your amplifier was designed, engineered and manufactured equivalent to
aircraft vibration standards and housed in a one-piece steel case with steel
top to ensure maximum reliability. The modular design allows quick repair
in the field should such a need arise.
The Eden line of World Tour 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: __________________________
Model: ___________________________________
Serial Number: _____________________________
Dealer: ___________________________________
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.
EIA rack
Power Output
Bridge Mode
Damping Factor
Freq. Response
Distortion THD
3.5” x 19” x 14.5”
32 Lbs.
2 Space w/ min. clearance
@ 8_: 2 x 300 Watts RMS; @ 4_: 2 x 600 Watts RMS;
@ 2_: 2 x 750 Watts RMS (Both channels driven)
@ 8_: 1200 Watts RMS; @ 4_: 1550 Watts RMS
+3dB min.
better than 100 from 20Hz to 1Khz
10Hz to 20KHz +/- 2dB
< .1 %
Power Requirements – The WT-1550 needs a separate properly grounded
20 Amp circuit @ 120 Volts for correct operation and best sound quality.
Fuse Requirements:
USA @ 120 Volts /60 HZ - 12 Amps, 5 x 20 mm GMC/T/slow blow
Europe @ 240 Volts/50 Hz - 6 Amps, 5 x 20 mm GMC/T/slow blow
Japan @ 100 Volts/60 Hz - 14 Amps, 5 x 20 mm GMC/T/slow blow
Operation and Power Requirements – For best electrical operation and
sound quality this unit should have a properly grounded, dedicated 20
Amp circuit for itself.
The WT-1550 has several unique features. Each channel is equipped with a
Volume, Bass and Treble controls, and an output limit level indicator.
Volume Control – This control sets the level of signal going to the amplifier
output stage. The further the control is turned to the right, the less signal is
required to drive the amplifier to full output.
Tone Controls – The Bass and Treble controls allow the player to quickly
adjust the audio spectrum. The Bass is centered on 46Hz; the treble is
centered on 3.5KHz. These controls are very useful in rooms with unusual or
bad acoustic characteristics. For example in a room that is very dead or over
damped, raising the treble level will allow the Bass to cut though better. If
the room has too much bass the same solution will be helpful. In a very live
or reverberant room turning down the treble will mellow out the Bass tone
quickly without upsetting your normal tone control settings.
Limit LED – This LED displays the amplifier maximum output condition
and lets you know that the amplifier has reached full output. It’s fine for the
LED to blink often at high power operation. It should not, however, remain
lit continuously. This LED also indicates that the internal limiter is engaging
to prevent clipping.
Signal Path Switching (Stereo, Dual Mono, Mono Bridged) – The WT1550 has input signal path switching on the front panel along with indicator
LEDs. This allows for an easy set up of the signal routing and a highly
visible display of the operating choices.
You can select Dual Mono (both channels see the same input), True Stereo
(each channel has its own input left and right), or Mono Bridged ( both
channels combine into one big channel and produce twice the power output).
You can operate in Bridged Mono @ either 8 ohms or 4 Ohms with this unit.
Channel Output Indicator – This LED indicates that the amplifier channel
has reached maximum output and is going into limiting.
Mains On / Off Switch – Turns the unit ON and OFF.
Front Panel Air Intake – Do not obstruct the airflow to this intake.
Obstructing the airflow to this intake is a Very Bad Thing and will reduce
performance of the entire cooling system.
Power Cord Jack – Your unit is fitted with an IEC interface for universal
AC cable connection. The removable power cord is attached here.
Fuse Holder –To access the fuse, unscrew the fuse holder cap, which is
located near the power cord. The fuse is selected for the country of operation
(see list at front of manual). USE ONLY THE SAME SIZE AND TYPE
FOR REPLACMENT. Using a fuse with a different rating than
specified is a VERY BAD THING and can cause damage to your
All models come with a holder marked (FUSE) and are factory configured
internally for 100/120/ 230/240 only and must be adapted by a service tech
for any voltage change. (See the inside of the top cover for information on
required changes for different voltage requirements. The standard fuse for
U.S. use is a 12 Amp slow blow or time delay. Do not use fast blow fuses.
Main Power Amplifier Outputs – The WT-1550 is provided with the
following connections on each channel: two _” phone plugs, one 5 way
binding post, and one NL4 connector. These connections are all wired in
parallel, so you can use any combination necessary to accommodate the
speaker cables you are using.
There is also a single NL4 connector for Bridge Mode operation.
IMPORTANT NOTE: Be careful with these connection points; this is a
BIG amplifier. It can produce a lot of output voltage. It is possible to get
a shock from any large audio amplifier under certain conditions.
Inputs ( Balanced & Unbalanced) – The inputs are configured as a
Balanced/Unbalanced TRS ( Tip, ring, sleeve _” jack ) and a 3 pin XLR
balanced Mic. Connector. These are wired in parallel without buffers.
Signal outputs – These are provided by TRS _” jacks with buffers (150
Ohms). Use these for linking to other amplifiers, etc.
Airflow Exit – DO NOT BLOCK THIS EXIT. If the airflow exit becomes
obstructed the amplifier will overheat and go into thermal limiting. The unit
should be cleaned and serviced about once a year by a qualified technician.
Thermal Protection System – The WT1550 has a fully automatic thermal
safety system that will automatically reduce the output power available as
needed to maintain best possible operations under sever operating
conditions. Both channels operate independent of each other.
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 an AGC (Automatic Gain Control) circuit if the
operating temperature goes above 200 degrees F. This circuit will
automatically turn down the output of the system in the event of overheating.
It will automatically reset itself to full power as soon as the unit cools down
to a safe operating temperature.
IMPORTANT NOTE: Excessive heat is a Very Bad Thing and can
result in severe damage to your amplifier. DO NOT bypass or
disconnect any part of your thermal safety system. Doing so will
immediately void your warranty!
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 per
channel) immediately. The supplied rack ears can be used to install your
amplifier in a conventional equipment rack for protection during
Electrical Connection – The WT1550 requires at least 20 Amps of
correctly wired alternating current for proper operation. Providing less than
20 Amps of power may result in poor amplifier performance and bad tone,
so it’s probably not a good idea to plug all of your band’s gear into a single
wall outlet.
Connections – Line connections (everything but the speakers) should be
made with high quality shielded cables. The use of speaker cables for line
connections will result in excess noise. Speaker connections should be made
with high quality 16 gauge or larger 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.
To operate your unit in Dual Mono mode, connect the signal from your
preamplifier to Channel One; using the Mode Selection switches on the front
panel, select Dual Mono mode. In this mode, both amplifiers will receive the
same signal. Connect the appropriate speaker cabinets to the outputs from
both amplifiers.
To operate your unit in Stereo mode, connect Left and Right signals from
you preamplifier to the appropriate channels; using the Mode Selection
switches on the front panel, select Stereo Mode. Connect the appropriate
speaker cabinets to the outputs from both amplifiers.
To operate your unit in Bridge Mono mode, connect the signal from your
preamplifier to Channel One; using the Mode Selection Switches on the
front of the unit, select Bridge Mono mode. Connect the appropriate speaker
cabinets to the Bridge Output ONLY. Do not connect speakers to the
individual amplifier outputs in this mode.
WARNING: Never, and we mean NEVER, connect the two individual
amplifier outputs to the same speaker cabinet, especially in Mono
Bridge Mode. If you do, you may damage the ampifier &/or speakers.
NOTE: Always select the operation mode while the amplifier is OFF.
DO NOT change modes while the unit is ON. If you want to change
modes, turn the amplifier OFF first.
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. Check all connections to make sure you’ve
connected everything properly. Ensure that the Mode Selector switches are
in the correct position for your chosen mode of operation. Failure to follow
these steps may cause damage to your amplifier.
Once you’ve ensured that all connections are correct, turn the unit ON. Turn
the Input Gain up to a level that matches your preamplifier. If necessary, use
the tone controls to quickly equalize your system to any room anomalies.
Clipping = Bad – Keep an eye on the Limit light. If it blinks, even
regularly, that’s OK. However, if it’s on all the time, you should reduce
Input Gain. As we said earlier, Excessive Clipping is 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 (on your pre-amp, or using the
Bass control on the amplifier), 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 is 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 is more noticeable
in the audience than it is on stage. Compensating for it may result in a stage
sound that may seem a little thin. However the sound is 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. (The propellerhead term for this is
“diaphragmatic.” So says David. – LB)
There you have it: a quick and easy process to help you set up your Eden
amplifier. It may take an extra minute or two to ensure everything is
connected correctly. However, doing so will ensure that you don’t damage
any equipment. Therefore, we highly recommend that you do this every time
you set up your system.
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 per channel, a 4 Ohm
model will draw the most current from your amplifier. If you will generally
be using two cabinets (per channel), 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 8 Ohm speaker option so that you can add
another speaker later if you need to. In general, adding more speakers will
give you a greater volume increase than adding a few more watts.
In Bridge Mode, you can use one or two 8 ohm cabinets, or a single 4 ohm
cabinet. Remember, in Bridge Mode, each amplifier “sees” half the load. In
other words, at 8 Ohms, each amplifier is operating at 4 Ohms. (4_ plus 4_
equals 8_ total.)
We have designed our amplifiers to operate safely at 2 Ohms only because
everyone else is doing it and some users expect it. However, we much prefer
operating at 8 or 4 Ohms because of the markedly improved quality of tone
and dynamic response.
Your Eden 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?
Contact Point Cleaning – One of the weakest links in most bass
amplification systems are the solderless connection points. 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 or a commercially
available de-oxidant. Frequent cleaning of the plugs on your cords is also
Dust Removal – You should periodically inspect the ventilation openings
on your 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 is indeed a
Very Bad Thing, perhaps the worst thing you can do. If you 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…technician.
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.edenelectronics.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.
Service – In the 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?
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.
Hours of operation are 8:30am to 5:00pm (Central Time), Monday through
Please ship Authorized Returns for service to:
Eden Electronics
P.O. Box 338
115 2nd Street
Montrose, Minnesota 55363
Email: [email protected]
Website: www.eden-eletronics.com
Eden Electronics
(847) 949-0444
C/O U.S. Music Corp.
(847) 949-8444(fax)
444 E. Courtland Rd.
Mundelein, IL 60060
Never Compromise
Note for those who care: This manual was written by David (Eden) Nordschow, Eden’s Chief
Propellerhead & Master of All Things Technical, and Lane Baldwin, Eden’s Special Projects Coordinator
(Many Other Functions). Any grammar errors are David and Lane’s fault, as are the attempts at humor.
Please don’t blame anyone else for any weirdness, as we were warned several times. Really.
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