The Ibanez TS808DX Tube Screamer w/ Booster expands upon the iconic original TS808 design literally. Alongside the classic 808 circuit is an additional clean boost circuit with an independent footswitch to take your playing up a gear. From light overdrive to gently thicken your sound to thicker crunchier tones the TS808 excels at them all and anything in between. The design of this section incorporates the JRC4558 chip internally- the exact same that made the original so special while the boost offers up to 20dB of additional volume to quickly cut through the mix at the touch of a button. One deluxe feature is the inclusion of the Boost switch which intuitively lets you place the boost circuit before or after the drive circuit. This offers unprecedented tonal control from a single unit and adds to the luxury feel of this expanded Tube Screamer. Two for the price of one All the character just bigger. The Ibanez TS808DX Tube Screamer w/ Booster is a loving recreation of the 1979 original TS circuit with an additional boost pedal also built-in. One of the most distinctive sounding pedals to ever exist the TS808 is steeped in history having been a personal favourite of Stevie Ray Vaughan among others. Its ability to offer everything from a warm boost to crunchy distortion has made it a mainstay on many pedalboards- from amateur to professional. Bombproof construction means reliable performance while the inclusion of the JRC4558 gives all the vintage character youd get from an early model. If you need something to fatten your tone lend harmonic warmth and offer rich mid-boosted overdrive the TS808 is the only pedal to choose. For those not needing excessive levels of gain the addition of the boost circuit makes this an all-in-one overdrive solution perfect for live applications. Secrets of the Tube Screamer The Tube Screamers clever design is the reason its still the industry-standard overdrive pedal. Widely imitated but never accurately replicated there are a few unique features that give the TS808 its unique sound signature. One of these is that the active high pass filter in the clipping stage rolls off the bass so that only frequencies above 720Hz get the full distortion and harmonics below get progressively less making the distortion frequency selective. After the clipping stage a passive low pass filter shaves off excess treble giving the characteristic mid boost that Tube Screamers are known for. The clipped output signal then also contains part of the input signal perfectly preserving the original dynamics of the instrument while also improving the responsiveness and overall clarity of the distortion. This is all made possible by the input buffer isolating the effect from the guitar retaining optimum signal fidelity one of the main reasons the TS808 can offer mid-heavy overdrive without the effect becoming muddy. This is what makes a Tube Screamer a Tube Screamer- optimum signal filtering and frequency selective distortion. Features Overdrive and Booster in one box Overdrive: Overdrive Tone and Level controls Booster: Boost Switch for Pre Overdrive / Post Overdrive True Bypass Voltage Switch: 9volt / 18volt Power Supply: One 9 Volt Battery or external AC adapter AC509 (sold separately)