6
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.
OTHER CONSIDERATIONS
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, a 4
Ohm model will draw the most current from
your amplifier. If you will generally be using
two cabinets, they should 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. Common Eden David
Series cabinets chosen to accompany the
WT-400 include:
(1) D115XLT or D210XLT 4 Ohm cabinet
(1) D410XLT 4 Ohm cabinet
(2) D210T or D210XLT 8 Ohm cabinets
(1) D410T or D212XLT 4 Ohm cabinet
(1) D115XL & (1) D210T 8 Ohm cabinet
Headphone Jack as Line Driver
– On
some occasions (such as high-volume or
outdoor situations) it may be desirable to
use the WT-550 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 WT-550 to an unbalanced input of a
standard power amplifier. This will provided
a signal that is post EQ and master volume
controls, allowing the entire system to be
controlled from the WT-550.
Using the WT -550 Without Speakers
This amplifier is 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.
MAINTENANCE
Your Eden amplifier has been designed to
require minimal routine maintenance.
Attention to the following areas will ensure
optimum performance of your amplifier.
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 is 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. These points should be cleaned
regularly with a cotton swab soaked in
denatured alcohol or a commercially
available deoxidant. Frequent cleaning of
the plugs on your cords is also
recommended.
Dust Removal –
You should 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.
Tube Replacement
–
Tube life varies
greatly depending upon use, vibration, and
tube quality. It is uncommon for a tube to
last less than a year in our circuits. Tube life
of several years is not at all uncommon.
Symptoms of tube failure include signal loss,
distortion, and increased noise. The tube is
