Hollow33

    Designed to bridge the considerable gap between an upright bass and a solid-bodied fretless, the Hollow33 is a highly versatile, hollow-bodied fretless bass with a warm, mellow, woody acoustic tone.
    The Hollow33 is lightweight, yet balanced and comfortable to play. Thanks to its two switchable pickups, the bass can produce a whole palette of sounds, making it suitable for a wide variety of musical styles.

    Standard features

    Body

    Mahogany hollow body
    Proprietary full hollow body construction
    Mahogany back with maple veneer

    Neck

    Fretless fingerboard
    33" scale length
    String spacing at bridge 4-string: 19 mm
    String spacing at bridge 5-string: 18,5 mm
    String spacing at bridge 6-string: 18 mm
    5-piece neck from straight grained aged neck blanks
    European Maple, mahogany and hard maple neck
    Two way quality truss rod
    Angled headstock strengthened with a volute
    Matching wood headstock plate
    white sidedots

    Pickups

    Adamovic basbars pair
    Pick-up covers matching to fingerboard wood
    Series / single coil / parallel switch for each pick-up

    Hardware

    Wooden bridge stringed trough body
    High quality Hipshot ultralite tuners
    Schaller security Locks

    Additional information

    Fretless
    Hollow

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    Sound samples

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    The design

    The design

    The Hollow33 is based on the Jupiter design and features a completely hollow body which is very similar in construction to an acoustic or steel-stringed guitar. However, instead of having traditionally bent sides, the body is cut out of a solid piece of wood, with sides measuring 5/8” (15mm) in thickness.

    The top and back of the Hollow33 are free to resonate and are designed to minimize feedback and maximize the acoustic sound when the bass is amplified. Due to its lower-rigidity design, the Hollow33 generates a warmer sound with more overtones and more complex notes.

    Supported only partially by the body wood, the Hollow33’s bridge absorbs the vibrations from the strings and transfers them to the top and back. This absorption of string energy makes the strings vibrate in a specific pattern, which is registered by the pickups, creating a unique, upright-like acoustic sound with long-sustaining notes.

    Because the body is cut out of a solid piece of wood, we are able to round its edges for a much more comfortable feel. The average weight of the Hollow33 four-string is under 3kg (6.6lbs), making it a breeze to play.

    The woods

    The woods

    We selected woods that complement the Hollow33’s acoustic timbre. The body is made of warm-sounding mahogany, with the perfect stiffness to support our proprietary full hollow-bodied construction.

    The back plate is also made of mahogany, and is supported by maple veneer and bracings. For the braced top, you can choose between maple, walnut and camphor burl.

    For the stable five-piece neck, we use straight-grained, aged neck blanks consisting of European maple, mahogany and hard maple, ensuring the perfect weight-to-stiffness ratio.

    The Bridge and scale length

    The Bridge and scale length

    The sound of the Hollow33 is largely determined by the bridge, which is glued directly to the top in a traditional manner. In this way, the largest part of the bridge, which includes the saddle, is not supported by the body, leaving it free to transfer the string energy into the top wood.

    Passing through the body, top and bridge, the strings place the optimum amount of pressure on the saddle. This construction maximizes the absorption of the string vibrations, creating a unique, upright-like acoustic sound with long-sustaining notes.

    The solid bridge and saddle are both made from a solid piece of wood. You can choose between Pau Ferro or ebony, which will be matched with the fingerboard, pickup cover and knobs. Alternatively, you can opt for the adjustable bridge, which has adjustable brass and steel saddles.

    The Hollow33 has a 33” scale. This shorter scale length produces a warm, woody tone with a strong fundamental. In addition, the lower string tension produces a fuller low end and more “bloom” at the end of the note.

    The Pickups

    The Pickups

    For many years, Nikola ran a repair shop in the Netherlands. During that time, he repaired many semi-acoustic and acoustic guitars and basses, most of which were equipped an active piezo pickup system under the bridge saddle. Many of these instruments had feedback issues and differences in output from string to string, which is typical of piezo pickups because of their pressure sensitivity.

    One of the main goals for the Hollow33 was to make an acoustic-sounding bass with regular magnetic pickups. Consequently, the acoustic sound had to come from the construction of the bass when amplified.

    A major advantage of regular magnetic pickups is that there are no feedback issues or volume differences between the strings. The Hollow33 can be strung with any type of electric bass string and can be played in full passive mode. Each pickup has three different switching options, offering nine sound combinations when the blend is set in the middle. This makes the Hollow33 a unique, versatile fretless bass.