I've owned this Empress ParaEQ for a few years now. I purchased this used from a colleague. I really like it but do not use it very often. It works great. A little "dirty pot" noise when adjusting the boost potentiometer, but not unexpected for a pedal that is from the 2000s. No AC adaptor or box included. $10 to ship CONUS, $25 to ship outside CONUS Here is a description I found online: The ParaEq w/Boost gives musicians a powerful, musical, high quality EQ in a conveniently small package. The signal path of the ParaEq w/Boost is comprised of the highest quality components chosen for their transparency, powerful tone shaping capabilities, and low operating noise. With the Empress ParaEq w/Boost your instrument will still sound like your instrument, only better. 3 bands of parametric EQ, each with 3 selectable q widths, give you extremely flexible EQ. The wide Q is great for general tone shaping and is extremely transparent. The medium Q is perfect for everyday problem solving like pulling out boxiness from the low mids to reducing harshness and adding bit in the upper mids. The narrow Q excels at notching out problem frequencies and is a saviour for acoustic guitarists when combating feedback issues. The Boost section offers 30dB of clean boost and can be set to engage with the EQ section to act as a make-up gain when doing subtractive EQ, or can be used completely separately as a pure clean boost. Great for bumping up your volume for solos or hitting the front end of a tube amp for a bit more break-up. Features · All Analog Signal Path – to deliver the most organic tone possible. · Ultra Transparent Sweet Sounding EQ – enhance your sound without masking the tone of your instrument. · Lots of Control - with switchable q, fully over-lapping sweepable frequency selection, and 15dB of cut and boost you’ll get all the control you need. · Ultra-Quiet – You’ve come to expect our pedals to be noise free and we’ve delivered once again. If you put this at the front of your chain and boost a bit you’ll also cut down on the noise your other pedals are introducing. · Loads of Headroom - Internally switchable to run off 9/12/18V power supplies. · 30dB of Boost - making it an ideal candidate before long effects chains and overdriving tube amps. · Pristine Clean Sound – We measured the distortion to be less than 0.03%. Pretty remarkable for a guitar pedal. · True Bypass - The Empress ParaEq w/Boost EQ Pedal employs true bypass, so you can be sure that it's not affecting the signal when disengaged. · Perfect Size - The enclosure measures approximately 4.5" by 3.5" by 1.5", which is delightfully small when considering all the features packed into this unit. Specifications · Power Input Voltage: 9 - 18 V DC (Negative tip) · Power Input Connector: 2.1mm barrel connector (Negative tip) · Power Consumption: 85mA (does not change with input voltage) · Enclosure Material: Die Cast Aluminum · Input connector: 1/4" Jack · Output connector: 1/4" Jack · Height (Enclosure only): 1.5" · Height (including controls): 2" · Length: 3.5" · Width: 4.5" · weight: 1 lb · Q's: 0.5, 1.5 and 3 · Input impedance: 1MΩ · Output impedance: 510Ω
Turning the knob is the boosting option. I've set it to boost as I need and the on/off switch engages it.