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Speaker Components & Drivers

Speaker components here are the parts inside a cabinet and around it: woofers, sub drivers, compression drivers and tweeters, 2-way crossovers and subwoofer filters, steel grilles and volume controls. Citronic drivers such as the 902.101UK are direct replacements for its CASA and CUBA cabinets, and QTX parts such as the 902.503UK compression driver are made for named QTX cabinets. Adastra adds relay-fitted attenuators such as the 952.470UK for 100V line systems.

Choosing Speaker Components & Drivers

Start from the cabinet the part is going into, because many of these parts name the speaker series they replace, then match the impedance and the power rating.

Citronic replacement drivers

Citronic woofers come in 4 ohm and 8 ohm versions, and the cabinet decides which. The 902.101UK 12" woofer is 8 ohm for CASA or CUBA passive cabinets, while the 902.102UK is 4 ohm for CASA, CUBA or CLARA active cabinets. Sub drivers follow the same split: the 902.121UK is for CASA passive sub cabinets and the 902.120UK for CASA active subs. Some parts belong to one system. The 902.118UK 18" sub driver, with a cast aluminium basket, replaces the driver in the C-118S sub cabinet, and the 902.208UK neodymium woofer and 902.210UK HF horn driver are replacements for the C-208 array cabinet.

QTX chassis speakers

QTX drivers are grouped by cabinet series. The 902.518UK and 902.521UK replace the main driver in QR passive cabinets, the 902.519UK and 902.522UK in QR active cabinets, and the 902.509UK and 902.512UK in QS series speakers. QT series drivers such as the 902.545UK are woofers with spade terminals. For the high frequencies, the 902.503UK compression driver fits the QR12, QR15, QS12 and QS15 among others, and the 902.530UK fits cabinets such as the QR8, QR10A, QT6 and QT8.

Crossovers, filters and grilles

The 900.582UK passive subwoofer filter crosses over at 120Hz with 12dB/oct damping and connects by solder terminals. Replacement networks such as the 902.557UK for the QR12 and the 902.506UK for the QR15 are replacements for the networks in those cabinets. The 900.954UK is a black powder coated steel grille with rubber surround edging, 380mm across.

PartExampleMade forRating
12" woofer, 8 ohm902.101UKCASA or CUBA passive cabinets350W RMS
Coaxial LF+HF driver902.691UKCM-series wedge monitors250W
HF compression driver902.503UKQR and QS cabinets35W RMS
QR active driver902.522UKQR active cabinets200W RMS
2-way crossover900.590UK2-way speakers250W
100V volume control952.470UK100V line systems50W

Related categories

Complete cabinets are on PA speakers and systems and subwoofers. Wire them with audio connectors and speaker cable, and see our Help & Support guides.

Brands we stock in Speaker Components & Drivers

Adastra, Citronic and QTX.

Frequently asked questions

What are speaker drivers?

Speaker drivers are the working units inside a loudspeaker cabinet that turn the amplifier's signal into sound. Woofers handle bass and mid frequencies, compression drivers and tweeters handle treble, and coaxial drivers mount a tweeter inside a woofer. A replacement driver should match the original's size, impedance and power rating. The range here includes Citronic and QTX replacement woofers and compression drivers.

What is a subwoofer driver?

A subwoofer driver is a large, heavy-duty speaker made for deep bass frequencies, usually fitted in a ported or folded sub cabinet. It typically has a large voice coil and a reinforced cone to cope with high power and long cone travel. When replacing one, match the cabinet's impedance, often four or eight ohms, and its power handling.

What is a full range speaker driver?

A full range speaker driver is a single cone designed to reproduce a wide spread of frequencies on its own, without a separate tweeter. Small full range drivers often appear in column arrays and compact enclosures. A coaxial driver gives a similar single-unit result by mounting a tweeter in the centre of a woofer. The range here includes compact array drivers and coaxial drivers.

How does a speaker driver work?

A speaker driver works by passing the audio signal through a voice coil that sits in the field of a permanent magnet. The changing current makes the coil move back and forth, and the cone or diaphragm attached to it pushes air to create sound waves. A flexible surround and spider return the cone to rest between movements.

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated

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