Radial Engineering StageBug SB-4 Manual

Radial Engineering Ikke kategoriseret StageBug SB-4

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Side 1/2

To view the 3-year transferable warranty details and

product specifications please visit www.radialeng.com

StageBug™ SB-4 piezo optimized direct box

USER GUIDE

+ =

Inverting the phase of the floor monitor (A) in relation to the

stage amp turns the feedback hotspot into a null.

+ =

In-phase frequencies from the floor monitor (A) and the stage

amp (B) combine and create a feedback hotspot.

Phantom LED

Thank you for purchasing your very own StageBug SB-4 Piezo direct box! We are excited

about producing a personal DI that is so small, it can actually fit inside a violin case! With

an SB-4 in hand, you can be ‘at the ready’ anytime you need to connect to a PA or

recording system. Although the SB-4 Piezo is designed to be plug & play easy to use,

please take a minute to read this short manual. It will give you insight on how to best use

your Radial direct box and get the most out of it.

OVERVIEW

The StageBug SB-4 is an active direct box that has been optimized for use with acoustic

instruments that commonly employ passive piezo transducers like a violin, mandolin, cello

and upright bass. Part of the magic is the ultra-high input impedance that tames piezo

transducers by smoothing out their response. This warms up the tone, eliminates squawk

and does away with the peaks that can make piezo equipped instruments sound

unpleasant. The rest is of course the magic that is built into every Radial DI box! With the

SB-4, you do not need a preamp in between the pickup and the PA. Just plug in and play!

CONNECTING TO THE PA SYSTEM

Before making connections, always turn audio levels down or the PA off. This will help

eliminate turn-on transients that can damage more sensitive components like tweeters.

Connect your instrument to the SB-4 input using a standard ¼” instrument cable. The SB-4

is designed to capture the sound right from the pickup without requiring an instrument

preamp in between. In fact, you will find the SB-4 to produce a much warmer and richer

tone than when using most instrument preamps. Simply connect to the PA system’s

microphone input using a standard XLR cable and then set the levels as needed.

USING THE FILTER

When using acoustic instruments on a live stage, the low frequencies generated by the PA

system can often cause the top of the instrument to resonate and create feedback. This is

all the more acute when using a piezo transducer affixed to the top or bridge. The

StageBug SB-4 is equipped with a high-pass (low-cut) filter that gently reduces the low

frequency content and eliminates the resonance. This not only solves the feedback

problem, but also helps clean up the mix for a more natural sounding performance.

USING THE 180° POLARITY REVERSE

Sometimes the sound from the PA system and reverberant field in the room will combine

to create hot-spots on stage. These hot spots are known as room modes and form when

two ‘like’ frequencies combine at a certain location on stage. When the two frequencies

are in phase this causes them to amplify which in turn, can cause resonant feedback.

Reversing the phase can often reduce the feedback by electronically moving the problem out

of the way. To use, make sure you are standing where you intend to perform. Have someone

reverse the polarity while you are playing to find the setting that works best. Keep in mind that

since each venue is a different size, the phase issues will be different. Adjust to suit.

RECORDING DIRECT WITH THE SB-4

Using a direct box to match the impedance will produce a warmer more natural tone

versus plugging the instrument directly into the recording system. The StageBug SB-4 is

well suited for this as it both balances the signal and matches the impedance

simultaneously. Simply connect the SB-4’s output to the mic input on your recording

system. Top engineers will often combine the sound of a direct recording with a mic and

blend them to suit. You will find the SB-4 will work very well with piezo equipped acoustic

guitars and other instruments too!

As an active direct box, the SB-4 requires 48V phantom power from the console to make

it work. Phantom power is a standard feature that is readily available on all consoles and

must be turned on. Once activated, the LED on the SB-4 will illuminate to let you know that

it is powered and ready for use.

ADDING A TUNER OR STAGE AMPLIFIER

The SB-4 is equipped with an AUX output that lets you plug in a tuner for quick

adjustments on stage. The AUX output can also be used to feed a stage amplifier if you so

desire or a separate monitoring system. This lets you create a comfortable sound on stage

that is completely unaffected by the PA system.

USING THE GROUND LIFT

Sometimes when connecting to both the PA and your stage amplifier via the SB-4, you can

encounter hum and buzz caused by a ground loop. If you encounter noise, try using the

side-access GND LIFT switch. The switch is recessed to prevent hitting it accidentally. Use

a small screwdriver or paper clip to push in the switch. If noise persists, connect your stage

amp’s power cable to the same AC outlet that is feeding the PA using a power bar. This

brings all of the electrical grounds together and often helps to eliminate ground loops.

Produkt Specifikationer

Mærke:	Radial Engineering
Kategori:	Ikke kategoriseret
Model:	StageBug SB-4

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