The [redacted ii] is a tube bass preamp pedal from Sushi Box FX, designed to capture the sound of legendary American high-power bass amplifiers of the 1960s. The maker describes it as "the tone you've heard on countless records and shaking countless stages in every genre of music." It carries a balanced XLR D.I. output alongside its 1/4" output, so it can feed a recording interface or front of house directly as well as a bass amp.1
EQ and controls
The heart of the EQ section is a custom-wound inductor from Unagi Magnetics, manufactured to replicate the inductors used in high-powered bass amps from the 1960s onward. The EQ itself is a three-band tonestack that allows both boost and cut of all three bands, so all three knobs at 12 o'clock give a "flat" setting.1
Two switches extend the preamp's range:
- Ultra Hi and Ultra Low switches extend the lows and highs of the preamp, for when you want more extreme top and bottom than the tonestack alone provides.1
- The Mids Frequency selector was expanded to an 8-position switch instead of a 5-position one, allowing greater flexibility in where the midrange band sits.1
Outputs
A balanced XLR D.I. output was added on the [redacted ii] so you can deliver your tone straight to the front of house or a recording interface. Both the 1/4" and XLR outputs have independent volume controls as well as independent bypass switches, so the two outputs can be managed separately.1
Power
Sushi Box FX recommends a 9-12VDC power supply capable of delivering at least 900mA. The maker warns that using a supply providing less than 900mA can potentially damage the power supply in use and/or the pedal, so a standard low-current daisy-chain output is not a suitable source. All [redacted ii] units ship with a 9V 1000mA power supply with a 100-240VAC 50-60Hz input, which works with international mains voltages.1
The [redacted ii] draws at least 900mA. A supply rated below that can potentially be damaged, or damage the pedal, according to the maker.1
Where it sits in the Sushi Box FX range
The [redacted ii] is part of a line of tube preamp pedals from Sushi Box FX that includes the redacted b, the Finally v3, the Venus Z and the Grand Slampegg, all aimed at players who want tube preamp tone on a pedalboard. For more on the category, see Preamp Pedals and Bass Pedals1.
Questions
What does the Mids Frequency switch do on the [redacted ii]?
The Mids Frequency selector sets the center frequency of the midrange band in the pedal's three-band EQ. On the [redacted ii] it was expanded to an 8-position switch instead of the 5-position switch used previously, which Sushi Box FX says allows greater flexibility when shaping the mids.
Does the [redacted ii] have an XLR output?
Yes. A balanced XLR D.I. output was added so you can deliver your tone straight to the front of house or a recording interface. Both the 1/4" and XLR outputs have independent volume controls and independent bypass switches.
What do the Ultra Hi and Ultra Low switches do?
The Ultra Hi and Ultra Low switches extend the lows and highs of the preamp, for situations where you want more extreme top and bottom than the standard EQ range provides.
Does the [redacted ii] include a power supply?
Yes. All [redacted ii] units ship with a 9V 1000mA power supply with a 100-240VAC 50-60Hz input, so it works internationally.
How much current does the [redacted ii] need?
The pedal needs a supply capable of delivering at least 900mA. Sushi Box FX warns that using a supply providing less than 900mA can potentially damage the power supply in use and/or the pedal.
How big is the Sushi Box FX [redacted ii]?
The enclosure measures 5.72 in x 4.77 in x 1.55 in (145 mm x 121 mm x 39 mm).
Sources (1)
- redacted ii, Sushi Box FX
![Sushi Box FX [redacted ii]](/img/preamp/sushi-box-fx-redacted-ii.webp)



