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Effects Send
This jack’s primary function is to send a post-EQ-and-SubWave™ signal to an external effects device for
use in the 350x Effects Loop. However, it can also be used as:
1. A line level output for use in conjunction with an additional (slave) power amp—such as SWR’s Power
750.
2. An unbalanced output suitable for recording or live mixing board purposes.
The output impedance of the Effects Send jack is 100 Ohms.
Effects Receive
This jack’s primary function is to complete the Effects Loop circuit by routing the post-external-effects
device signal back into the power amp of the 350x, where it can be blended back in with the original sig-
nal by using the Effects Blend control on the front panel. However, it can also be used as:
1. A power amp input jack. If, for some reason, you wished to bypass the entire front end and use the
350x strictly as a power amp, you could take the output of whatever line-level audio source you wished
and connect it to this jack. Then, set the Effects Blend control to the full clockwise (“WET”) position. Use
the Master control to set the overall level, and your 350x is now a power amp only.
2. An input for pre-recorded music, for playing along and practicing purposes. To accomplish this, insert a
CD player or other sound source into the Effects Receive jack. (It must be a MONO 1/4" plug that goes
into this input, so you’ll have to use a stereo-to-mono cable adapter of some kind.) You can adjust the
level of recorded music versus the “live” sound of your instrument by using both the Effects Blend control
(the more clockwise the control, the more pre-recorded music signal you’ll hear) and the volume control of
your CD (or other) audio source. The mixed sound will be heard through your speakers. Besides pre-record-
ed music, this is also an excellent way to practice along with a drum machine.
Input impedance of the Receive jack is 27k Ohms minimum.
Note: Inserting a plug into the Effects Receive jack activates the Effects Blend control. The con-
trol receives this command through the ground created by the phone plug making contact with the
jack. The plug must be a mono plug (tip and ground). If you have a stereo plug only, it will be nec-
essary to tie the ring and the ground together.
SubWave™ Activator Footswitch
Your 350x comes equipped with the capability for hands-free control of the SubWave™ effect. To achieve
this function, locate the footswitch included in your 350x packaging. Connect the cable to the SubWave™
Footswitch jack on the rear of your 350x. Turn the effect on and off by stepping on the switch; the illumi-
nated switch above the SubWave™ Level control on the front panel should alternate on (blue) and off, and
the effect should engage and disengage accordingly.
Note: The type of switch contained inside the footswitch chassis is momentary, normally open. If
you connect the footswitch to the unit while the unit is on, the SubWave effect may engage. This is
normal.
Cooling Fan & Fan Mode Switch
The power amp in your 350x is cooled by two methods: 1) An (internal) extruded aluminum heatsink; and
2) A thermostatically controlled fan. This fan turns on when the heatsink reaches 50 degrees centigrade
and turns itself off when the heatsink reaches 40-45 degrees centigrade. This allows for “silent running”
when used at low volumes. Be sure to leave at least a 1/2" clearance between the vent on the sides of
your 350x and the sides of any rack case or enclosure in which you install your amp. This will allow for the
heat generated by internal components to escape.
Setting the Fan Mode Switch to the “Fan” position activates the internal cooling fan’s normal operating
mode as described above. Setting the switch to the "Defeat” position deactivates the cooling fan regard-
less of the internal temperature of the unit. For this reason, it is recommended that the Fan Mode Switch
be set to the “Fan” position for the majority of the time that the amplifier is in operation.
Note: It is normal for the cooling fan to be audible at low levels. We recommend deactivating the
fan only in situations where the noise floor is so low that normal fan noise might be noticeable or
distracting, such as recording situations where a microphone is used in close proximity to the unit.
350x OWNER’S MANUAL • 11