Replace your PA drivers
Low Frequency Application Guide
Celestion offers a wide range of low frequency (LF) drivers that are ideal either for use as upgrades for stock loudspeakers or replacements for damaged drivers in the majority of sound reinforcement cabinets. The following page lists the speakers that are suitable for use with the most popular cabinet configurations. Simply follow the checklist below to identify the right Celestion driver for your application.
- Identify the application type from the categories shown: is it a subwoofer, full-range or satellite box?
- Select the correct speaker size from the pull-down menu: 5" (125mm) to 21" (525mm) diameter speakers are available.
- Pick the appropriate power handling: we'd recommend you select the closest value to the driver you are replacing. (For more information about the different ways that power handling can be measured, see the section A Word About Power.)
- Where possible, closely match sensitivity (dB) and Xmax (sometimes called "throw".) This will ensure the characteristics of the Celestion driver are close to those of the speaker you are replacing.
- Ensure the PCD (fixing-hole positions) match those in your cabinet. See table of fixing dimensions.
A Full-range Loudspeaker is a cabinet in which one or more individual drivers cover the whole audio frequency range. A Satellite is a cabinet that covers most of the audio range, with the exception of the very low frequencies, which are reproduced by a companion Subwoofer. Full-range and Satellite speakers are available in a number of popular configurations. A two-way cabinet commonly features an LF speaker as well as a compression driver for high frequency (HF) reproduction. A three-way cabinet features LF, HF and Mid Frequency (MF) speakers.
Compact Box Reflex
A compact sized two-way box featuring an air vent (often referred to as a port) to generate bass level.
Large Box Reflex
A large sized two-way or three way box featuring an air vent (often referred to as a port) to generate bass level.
Simple sealed two-way or three-way enclosure.
Dedicated Mid Range
A mid-range driver reproduces the mid-frequencies in a three-way cabinet. This could be positioned in a dedicated enclosure within the cabinet itself, or alternatively, may have a "closed back" chassis.
A subwoofer is dedicated to the reproduction of the lowest frequencies within the audio signal. There are a number of popular designs that are used:
The enclosure features an air vent (referred to as a port) of carefully calculated dimension in order to generate bass extension.
The cabinet incorporates an acoustic horn in which the path from throat to mouth is folded or curled to give the longest possible path in a given volume.
A vented box in which the contribution from the rear face of the driver cone is trapped in a sealed box, and the radiation from the front surface of the cone is into a ported chamber, to generate an extended bass response.
This design combines a direct and a simple horn-loaded output to generate a sub-bass signal.
A word about power
There are various ways of measuring the power of a loudspeaker – some more flattering than others. Celestion uses the AES standard because it's scientific and reliable. While there is no consistent correlation between AES, EIA and Music Program Power, the scale below provides a rough guide to compare how an individual speaker might rate using each measurement method.
Choosing the right LF speaker
- Identify application type
- Select correct driver size
- Pick appropriate power handling
- Closely match sensitivity (dB) and Xmax values
- Ensure PCD (hole positions) match enclosure, see table