SWR 550x, Руководство пользователя

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550x • 7
GETTING SOUND OUT OF THE 550x
Plug your instrument into the desired input jack (please refer to "Front Panel Features" for more detail). Turn your instrument's
volume up to at least 75% of maximum and slowly adjust up the Gain control. Keep playing and turning the Gain control up until
you see the Preamp Clip LED turn red. Then back off the Gain Control about one large hash mark on the dial. Now turn up the
Master Volume control to an equal level. You should now hear the sound of your instrument amplified through the 550x into
your speaker cabinet(s).
550x - FRONT PANEL FEATURES
INPUT JACKS
Both input jacks accept a standard 1/4" phone plug and both inputs can be used at the same time. Since the two inputs are
totally independent, no loss in volume or tone will occur by using two instruments simultaneously. However, the main applica-
tional use for the two separate input jacks is their difference in level, as the Passive/Active input has five times more gain than
the Active input. In other words, it's not necessarily intended as a "submixer" for two instruments, but no harm will come from
having two instruments plugged in at once. Please read below for more details.
PASSIVE/ACTIVE INPUT JACK
This input jack is designed to accommodate both "passive" instruments and most "active" instruments. A passive instrument
has no built-in preamp and does not use a battery, while an active bass utilizes a battery-operated preamp for gain, tone con-
trols, or both. The Passive/Active Input will work with all instruments having a maximum output of less than 1 volt RMS. Some
active pickups such as EMG, Bartolini, etc., use batteries for operation and will work perfectly using this input. Instruments
made by MTD, Sadowsky, Modulus, etc., have active electronics that are suited for use in the Passive/Active input.
Generally speaking, try this input first. If you hear a small amount of distortion and the preamp clip LED is not activated, try
using the Active input jack. If the Active input does not correct any audible distortion, check the battery in your bass.
NOTE
: If you would like to overdrive the first TUBE stage, this can be accomplished by using an
external preamp between your instrument and the Passive/Active input. To obtain optimum sound
when trying this, make sure the preamp clip LED is not activated. If this occurs, turn down your Gain
Control until the LED does not light. The first preamp tube stage is NOT monitored by the preamp clip
circuit for this reason.
ACTIVE INPUT JACK
The Active input jack should be used with instruments having a built-in (on board) preamp or other sound sources that will pro-
duce output levels greater than 1 volt RMS. The number of bass manufacturers has increased significantly over the years, and
it's impossible to try and keep track of them all. Generally, if you have very "hot" pickups and/or tone controls installed in your
instrument, and you use them to boost the level of your bass signal 10 dB or more, you may find the Active input more com-
patible. The best judge is your own ears.
If you're using a keyboard or bass pedal with the 550x, we have found the best choice to be the Active input.
NOTE : Using the Active input with passive basses (active instruments will always employ a battery)
may result in a loss of high end transients. Players who roll off their high end starting at about 2kHz,
or prefer a "darker" sound, may find this input more to their liking.
If you hear some distortion with your active bass and are using the Active Input, make sure the preamp clip LED indicator is
not lighting. If the preamp stage is not being driven into clipping, replace the battery in your instrument.