The ATK400 is an ATK series solid body electric bass model introduced by Ibanez in 2001. It was made in South Korea as part of the Standard range.
The ATK400 features an asymmetric double-cutaway mahogany body with ash top bolted to a laminated maple neck with a 24-fret maple fingerboard with mother of pearl dot position markers. Components include a single CAP triple humbucker pickup mounted in the ATK4 bridge and feeding an Ibanez ATK 3-band EQ powered by a 9V battery, a plastic nut and Wilkinson open gear tuning machines.