Some basses, particularly expensive boutique instruments or custom-made guitars, use more unusual pickup configurations. Examples include a soapbar and a "P" pickup (found on some Fender basses), bassist Stu Hamm's "Urge" basses, which have a "P" pickup sandwiched between two "J" pickups, and some of funk bassist Bootsy Collins' custom basses, which had as many as five J pickups. Another unusual pickup configuration is found on some of the custom basses that virtuoso bassist Billy Sheehan uses, in which there is one humbucker at the neck and a split-coil pickup at the middle position.
Most electric bass guitars use magnetic pickups. The vibrations of the instrument's ferrous metal strings within the magnetic field of the permanent magnets in magnetic pickups produce small variations in the magnetic flux threading the coils of the pickups. This in turn produces small electrical voltages in the coils. Many bass players connect the signal from the bass guitar's pickups to a bass amplifier and loudspeaker using a 1/4" patch cord. These low-level signals are then strengthened by the bass amp's preamplifier electronic circuits, and then amplified with the bass amp's power amplifier and played through one or more speaker(s) in a cabinet.
There's a lot to be said for tradition when it comes to the bass guitar, and it's a tradition that ultimately goes back to the originals: the Jazz Bass and Precision Bass. With some stellar options available from Fender and Squier, you're in a good place to get started with those iconic bass guitars. On the other hand, if you'd prefer something a bit more unique, you've got no shortage of options. Over the years, the bass guitar market has grown hugely, and there are now a ton of choices ranging from beginner-friendly instruments like Rogue and Dean models all the way to professional masterpieces from luthiers such as Warwick, Schecter and Rickenbacker.
A number of accessories are designed for the bass drum (also called "kick drum"). Ported tubes for the bass drum are available to take advantage of the bass reflex speaker design, in which a tuned port (a hole and a carefully measured tube) are put in a speaker enclosure to improve the bass response at the lowest frequencies. Bass drumhead patches are available, which protect the drumhead from the impact of the felt beater. Bass drum pillows are fabric bags with filling or stuffing that can be used to alter the tone or resonance of the bass drum. A less expensive alternative to using a specialized bass drum pillow is to use an old sleeping bag.
There are many different types of keyboards available. On the lower end are keyboards that you’d find in a toy store, while music stores have keyboards that are more fully-featured and intended for serious musicians and producers. These types of keyboards are commonly loaded with different voices, tones, rhythms, and sound effects to give a player or producer a lot of control over their sound. Within this type of keyboard, you’ll find synthesizers and MIDI controllers. Another differentiator among keyboards is the number of keys. Some keyboards have fewer than the traditional 88 keys you’d find on a digital piano. This allows certain keyboards to be more compact and generally doesn’t impact the ability for the player to create music. While some keyboards have keys that are weighted, many do not. This means that keyboards do not move or react like piano keys.