SKU: 3785756005

Radial Engineering SB-4 PIEZO StageBug DI Box

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Description

Radial Engineering SB-4 PIEZO StageBug DI BoxRadial Engineering SB 4 overview The StageBug SB 4 Piezo DI from Radial Engineering is a compact active direct box that has been optimized for use with piezo transducers. This enables violin, dobro, mandolin, cello, upright bass, and other instruments that are best amplified using a piezo to be connected to a mixing board or recording device. This unit features a 1 4" input for the instrument pickup and a 10 M impedance that smoothes out troublesome

Radial Engineering SB-4 overview

 

The StageBug SB-4 Piezo DI from Radial Engineering is a compact active direct box that has been optimized for use with piezo transducers. This enables violin, dobro, mandolin, cello, upright bass, and other instruments that are best amplified using a piezo to be connected to a mixing board or recording device.

 

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 unit a suitable companion for orchestral artists, blue grass players, and pop string quartets that need to turn it up when in concert.

Active DI optimized for piezo transducers
Smoothes out peaks, eliminates squawk
High pass filter eliminates resonance
Ultra compact to fit in your guitar case
Made in Canada

Radial Engineering SB-4 specs

Circuit Type Piezo optimized active buffer
Frequency Response 20 Hz to 20 kHz
Total Harmonic Distortion 0.006%
Dynamic Range 100 dB
Input Impedance 5 MΩ
Maximum Input +4 dBu
Gain 2 dB
Output Impedance 330 Ω
Equivalent Input Noise -101 dBu
Noise Floor -97 dBu
Intermodulation Distortion <0.01%
Deviation Phase: 10° @ 50 Hz
Switches High Pass Filter, Phase, Ground Lift
Low-Cut Filter 150 Hz
Filter Slope: 6 dB/octave
Instrument Input 1/4" buffered with piezo optimized load
Auxiliary Output 1/4" buffered to drive guitar effects, amplifier, or tuner
Balanced Output Pin-1 ground, pin-2 (+), pin-3 (-)
Others Polarity Reverse: 180°
Ground Lift: Soft lift with 100 Ω to ground
Construction 16 gauge steel chassis & outer shell
Finish Baked enamel
Power 48 V phantom power
Dimensions (L x W x D) 4.50 x 1.85 x 1.35" (114.00 x 47.00 x 34.00 mm)
Weight 8.80 oz (249.48 g)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 3785756005

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4.7 ★★★★★
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Hemant
Charlottesville, US
★★★★★ 5
It's very good
Size: 1.7 Fl Oz (Pack of 1)
Very good quality, it's clear and it blends in well, no oily feel, no pore blockage, no tears in the eye or any kind of irritation, It works well for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 1, 2026
D
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DonkeyDoug
Battle Creek, US
★★★★★ 5
seriously matte-ifying
Size: 1.7 Fl Oz (Pack of 1)
Don’t judge but back in the day I used to use Avon’s “face perfector” because it REALLY cut down on the shininess of face oil and it also had SPF. It made your face look matte without any other makeup. And I am pleased that this gel is similar. No face grease. It’s not even really a gel—if instantly feels powdery (somehow?) in your hand, thus it’s nongreasy. It leaves your face shine free and protected.
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Reviewed in the United States on April 27, 2026
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Verified Purchase
Nicolás
Birmingham, US
★★★★★ 5
Perfect for a low-maintenance man
Size: 1.7 Fl Oz (Pack of 1)
I have very fair skin and am a low maintenance kind of guy. My entire skin care routine is washing my face and trying my best to remember to put on sunscreen. This is the best face sunscreen I have ever used. It literally seems to disappear on my face immediately after applying it. I sometimes doubt I even got it spread evenly because of how quickly it disappears but it has worked just as well as thicker sunscreens I have used in the past. I would bet this would be great for women under their makeup because it wouldn't feel like another layer.
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Reviewed in the United States on May 10, 2026
J
Verified Purchase
Jhenna S.
Bozeman, US
★★★★★ 4
~ Oily Skin Review ~ (Updated)
Size: 1.7 Fl Oz (Pack of 1)
I haven’t seen any oily skin reviews of this product so I took a shot of buying it and trying for myself. Hopefully this review helps you. I have oily combo skin. It is also sensitive and prone to breaking out. When I shook the product, as instructed, it was not a gel I was expecting. It’s kind of matte gel (almost like a primer), which I don’t like using matte products since it makes me even more oily and the texture of the gel is like a primer. Kind of greasy but soft. However, when rubbed into the skin all the way it surprisingly left my face feeling soft and not really greasy, and even though it’s suppose to be a matte finish, I think because I used my cerave moisturizer first, it left more of a satin finish. After a couple hours I was happy to see that my face wasn’t ridiculously shining! It had a nice glow, and my face (mainly in the T-zone) felt a little bit slippery which I’ll call a win because like I said earlier the product had a bit of a greasy texture so I was expecting to feel REALLY greasy but I didn’t. And another huge bonus is it did not cause me to break out!! Usually my skin with purge on day one of using something new and my skin did not! If you have oily skin I would say try it IF you want to. The price is a bit too much in my opinion, I’d rather spend maybe $15 max on this product but honestly the results, for me, I think I would purchase it again. But oily skin responds differently for everyone so if you wanna try it, I’d say got for it. But if you don’t wanna risk it because of the price, honestly wouldn’t blame you for not trying it. Update: So I have used this for I don’t know how long now. Imma say this much. For colder seasons, my skin loves it. For warmed seasons my face starts to feel extra greasy. Bought the Daily Face liquid, my skin loves it! Have not broken out from it, no white cast. Would recommend not using the gel during warmer seasons.
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Reviewed in the United States on March 19, 2024
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Verified Purchase
Katy L
Boise, US
★★★★★ 5
Lightweight and sheer sunscreen
Size: 1.7 Fl Oz (Pack of 1), Size: 1.7 Fl Oz (Pack of 1)
This is very lightweight and sheer. It’s blends into the skin nicely. I use under my makeup daily.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026

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