The Aaron Patrick AP4 Signature bass is modeled on the popular Solo Series guitars. It has classic styling which is very comfortable and provides great access and playability. The body is made from premium black walnut, which is a high-quality tone wood that is warmer than alder or swamp ash, and has a very attractive grain when finished in glos, satin or tung-oil. The body can be also topped in any of Kiesel Guitars' many finishes, including solid colors, translucent finishes and our metallic solid finishes. If desired, you can add premium top woods, such as AAAA flamed maple, AAAA quilted maple, flamed koa, flamed spalted maple, burled maple and California Claro walnut.

AP4 5-Bolt Neck Heel
AP4 5-Bolt Neck Heel
The standard bolt-on quartersawn maple neck of the AP4 clarifies the overall tone of the instrument, but other neck woods, such as mahogany and koa are offered for their own slightly warmer tonal qualities. 3 and 5-piece necks of different combinations of maple, walnut, mahogany, limba and koa add to the already great looks of this instrument. The neck itself is topped with a tung-oiled finish. Each Kiesel Guitars neck goes through an exclusive, several-week long conditioning process which maximizes the stability of the neck forever. Two high-strength carbon-fiber reinforcing rods are placed in all bass necks along with a very stout and reliable easy to adjust dual action truss rod. The result is a neck that will remain true and adjustable for the life of the instrument. The new 5-bolt sculpted neck joint is strong and provides additional punch, while having a minimal heel.

The AP4 features a standard 34" scale ebony fingerboard with white pearl dot inlays, standard black-ring Luminlay Super Blue glow-in-the-dark side dots, a 14" radius and 20 medium-jumbo stainless steel frets. You can choose from a wide assortment of fingerboard options, including rosewood, royal ebony, zebrawood, purpleheart, maple, birdseye maple or flamed maple fingerboards; dot, block, diamond inlays in mother-of-pearl or genuine abalone as well as colored acrylic dots, blocks and diamonds and Luminlay inlays. The Custom Shop also offers a number of fretwire options, including jumbo, low-wide and stainless steel, with medium-jumbo stainless steel being standard. For the fretless player, you can choose an unlined ebony fingerboard, or an ebony fingerboard with white inlaid lines and with or without dot position markers. All fretless necks also have Luminlay side dots. The "Rapid Play" low action neck assures effortless playability throughout the entire fingerboard, while the lower cutaway and innovative cutaway neck heel allows easy access all the way up to the 20th fret. Our fully-computerized CNC machinery guarantees a neck pocket which the neck will fit perfectly in to, increasing stability and sustain.

AP4 Bass Controls
AP4 Active Electronics Control Layout
Electronics on the AP4 are 18V active/passive with a master volume/push-pull active switch, pickup blend, stacked concentric bass/treble, and stacked concentric mid with sweep. This electronics configuration has proven to be very popular among bassists, providing a huge array of tonal options that are suitable for any style of music. A Kiesel SCP split coil humbucker is in the neck position, along with a J99A single-coil alnico pickup in the bridge position.

A Hipshot™ A-style bridge with strings fed through the body is standard. Kiesel Guitars has used an assortment of bridges throughout the years, and we've found the Hipshot to be one of the best available. This bridge provides deep punch and definition, and has individual side-to-side string adjustment which allows you to custom-tailor the playability of your bass. The Hipshot bridge allows you to feed the strings through the body (standard), or top load the strings. The AP4 comes equipped with medium-light roundwound strings, and you can also choose medium-heavy, flatwounds or medium-light stainless steel strings. Premium 20:1 tuners are standard, and standard hardware is chrome, with 24K gold or black optional.

Other bolt-neck Kiesel basses include the Vanquish V49K, which has a retro-modern design, in a 4-string configuration with active/passive electronics standard. The V49K can be fully customized with our complete selection of Custom Shop options. A five-string model, the Vanquish V59K, is also available. Other bolt-neck Kiesel basses include the popular PB and JB Series, available in 4 and 5-string configurations, as well as multiscale JB Series models.