
Note: Do not connect the Line Out to speakers or headphones. For further information, refer to the
hook-up diagrams for proper connection.
Impedance Selector
Set the Impedance Selector to match the impedance load of your cabinets. Here’s how:
4-ohm setting = One 4-ohm cabinet or two 8-ohm cabinets (one connected to each speaker output)
8-ohm setting = One 8-ohm cabinet or two 16-ohm cabinets (one connected to each speaker output)
16-ohm setting = One 16-ohm cabinet connected to the Speaker 1 jack
Note: Loads less than 4 ohms may harm your amp. If you aren’t sure if your speaker load is correct,
contact your RIVERA dealer, or call RIVERA Customer Service.
Footswitch jack
This 8-pin DIN plug is designed to work
specifically with the included FS-7 foot-
switch. Your KnuckleHead will function
perfectly without a footswitch. However,
the footswitch provides a hands-free way
to switch channels and select boost functions. Its three switches control the following:
Channel Select Gain Boost for Lead/Crunch Channel Ninja Boost for Clean/Rhythm Channel
Note: If you are using the FS-7 footswitch, make sure that all pull switches on the amp’s front panel are
pushed in. If any of the pull switches is pulled out, then the corresponding footswitch function will not
operate. Also, the switches and their LEDs are driven by the amplifier’s power. There is no battery to
replace inside the FS-7.
Effects Loop
Of course, you can use pedals and rack-mounted effects between your guitar and the amp. In fact,
that’s where most wah-wahs and other pedals sound exceptionally good. However, rack signal proces-
sors are often best suited to being placed after the preamp’s tone-shaping circuitry. Your KnuckleHead
II’s Effects Loop is designed to give you the best match between the amp and the processor by allowing
you to set the level of the signal going to the effect, as well as the one coming back. Therefore, you can
tailor your amp/effects levels for best signal-to-noise ratio and the amount of distortion you want.
Note: The Effects Loop Send can be used to route a signal to a guitar tuner.
The Effects Loop comes after the preamp section. In addition, its low-impedance circuitry lets you
drive everything from the simplest stomp-box effect to the most sophisticated pro signal processor with
excellent results. It’s also fully buffered, meaning that it can drive long cords and line-level gear and
mixing consoles. (Because the signal is electrically unbalanced, you can use an unbalanced-to-balanced
output transformer to connect to equipment requiring a balanced input.)
Knuckle
Head
II
®
PRESENCE
POWER STANDBY
FOCUS MASTER 2 BASS MIDDLE TREBLE GAIN 2 MASTER 1 TREBLE MIDDLE BASS GAIN 1
BOOST SWEET SCOOP BOOST SELECTNINJA NOTCH BRIGHT
INPUTS
LOW
GAIN
HIGH
GAIN
HANDCRAFTED BY
RIVERA RESEARCH & DEVELOPMENT SYLMAR, CA USA
PULLPULLPULLPULL
CLEAN/RHYTHM LEAD/CRUNCH
PULL PULL PULL PULL
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FOOTSWITCH
USE FS-7 ONLYCAUTION: CHASSIS SURFACE HOT.
ATTENTION: SUPERFICIE DE CHASSI CHAUDE
CAUTION: NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING
TO QUALIFIED PERSONNEL.
SEND
LEVEL
RETURN
LEVEL
EFFECTS LOOP
z OUT
560 Ω
z IN
250k Ω
SEND RETURN
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