Radial StageBug SB-4 Piezo DI Compact Active Direct Box 

The StageBug SB-4 Piezo is a special direct box designed specifically for instruments that use a piezo electric transducer as a sound source element. Piezos are notorious for the peaky response and edgy tone when the do not see a proper load.

The SB-4 has been optimized with a 5 meg-ohm input impedance that smoothes out the dynamics while increasing the frequency response for a warmer, more natural tone. The SB-4 has also been equipped with a high pass filter that gently rolls off excessive bass which can cause resonant feedback.

This makes the SB-4 a great choice for voilin, fiddle mandolin, upright bass and for expensive guitar where you do not want to mount an active system.Features: Active direct box for piezo transducers Smoothes out peaks, squawk and edginess Low cut filter eliminates resonance. 

This unit features a 1/4" input for the instrument pickup and a 10 MΩ impedance that smoothes out troublesome peaks. The higher impedance also broadens the frequency response for a more natural and pleasing sound. The active circuit performs the high-to-low impedance conversion and balances the signal to enable long runs upwards to 328’ (100m) without loss, delivering linearity and low distortion throughout the audio range.

To help eliminate feedback on stage, it is equipped with a high-pass filter and 180° polarity reverse switch. The high pass filter eliminates excessive bottom end, which in turn reduces resonance that can cause the top of the instrument to vibrate. The 180° polarity reverse helps reduce acoustic hot spots on stage by changing the phase relationship between the PA system and room acoustics, which can combine at certain frequencies to create peaks.

Reversing the polarity eliminates the acoustic peak without resorting to severe equalization which only serves to compromise the natural tone of the instrument. The unit’s connections include an AUX out for a stage amplifier plus a standard XLR output to feed the PA. Power is derived from the console's 48V phantom, thus eliminating the need for batteries or external supply. These features combined with the compact size makes this uni suitable companion for orchestral artists, blue grass players, and pop string quartets that need to turn it up when in concert.

Features

• Enables violin, dobro, mandolin, cello, upright bass and other instruments without compromising the tone or frequency response.
  
• Active DI optimized for piezo transducers
  
• Smoothes out peaks, eliminates squawk
  
• High pass filter eliminates resonance 
• Ultra compact to fit in your guitar case

Specifications

• Input: 1/4" Instrument Input
  
• Outputs: 1/4" Thru Output, XLR Balanced Output
  
• Controls: Load Selector Switch, Low Cut Filter Switch
  
• Power: 48V Phantom Power or 9V Battery
  
• Construction: 14-Gauge Steel
  
• Dimensions: 3.5" x 2.0" x 1.35" (88.9mm x 50.8mm x 34.3mm)
  
• Weight: 0.55 lbs (0.25 kg)