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1/4-inch T.R.S.
Phone Plug
Tip = 0°
Ring = 180°
Sleeve = Ground
20. Ground Lift Switch
The Ground Lift switch is located next to the balanced Line Out XLR on the rear panel. If
hum is detected, when connecting from the balanced Line Out XLR to a mixing console (or
any other audio device), lift the ground (pin 1) by pressing the Ground Lift switch in.
21. Amp In ¼ -inch Jack
The balanced Amp In jack is located on the rear panel of the DynaBass 800. The Amp
In jack provides a direct path to the DynaBass 800's power amplifier, bypassing the
preamp. The Master control still controls the overall output level. Multiple DynaBass 800's
can be linked together by using the DynaBass 800's balanced XLR Line Out to additional
DynaBass 800 Amp In jacks.
22. Effects Send and Return ¼ -inch Jacks
External effects processors are provided with a balanced post-EQ signal from the Effect
Send jack. The balanced Return jack is used to return effects (processed audio signals) back
into the DynaBass 800. The Effects Return control, located on the front panel, regulates the
blend of effected and un-effected signal. This input can also be used as an auxiliary input for
mixing in a secondary source of audio such as pre-recorded music.
User Note: The Effects Send jack can also be used as additional line out for sending signals to
another power amplifier. The output of this jack is not muted when the Mute switch is enabled.
23. Output Jacks
The ¼-inch and Speakon™ jacks are used to connect extension speaker cabinets. All
speaker output jacks are in connected in parallel; the minimum load impedance is 2-ohms
(e.g. two 4-ohm or four 8-ohm cabinets).
24. Cooling system
Two 3-inch fans cool the DynaBass 800. The fans are run at low speed and the speed self-
adjusts depending on how hard the amplifier is working. The air intake vents are located at the
rear of the amplifier and on the top (near the back). The exhaust vents are located at the sides.
Caution: The rear vent must be kept clear in order for the air to enter into the amplifier. The
side vents are used to allow warm air out of the unit. Allow at least an inch clearance for each
side. Always keep the rear of the unit unobstructed. Rack-mounting the DynaBass 800 chassis
will not affect intake/exhaust airflow as long as the rear of the rack casing is open during
operation and 1 inch of clearance along the sides is unobstructed.
25. 1U Rack space
The DynaBass 800 provides a standard 1U 19-inch rack space for your outboard rack gear.
Remove the rack space plate, install your 1U tuner, processor, etc..., to complete your
personalized compact bass rig.
26. Preamp Tube Replacement
Use only Yorkville Sound part number "12AX7SORTED" when replacing preamplifier tubes
as they have been specifically selected for this product. Please refer to the Service Manual
for more information.
Balanced 1/4-inch T.R.S. to Balanced XLR
XLR Plug
(Male)
Pin 1 = Ground
1
2
Pin 2 = 0°
3
Pin 3 = 180°
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