Apollo offers a number of different sounders:

XP95 100dB(A) Loop-Powered Sounders are designed for use in open areas and can be connected to any XP95 or Discovery system. They have a guaranteed output of 100dB(A) and a current consumption of just 4.5mA. • sounders can by synchronised • group address facility • line powered requiring no external power supply • wall mounted The new Intelligent Base Sounder has been designed to replace the existing 85dB(A) loop powered sounders and it builds on the strengths of the current sounders but offers in addition: Synchronisation of continuous and pulse tones ensuring alert tones are not mistaken for evacuate tones. Multiple addresss allocation meaning that more than one sounder can be allocated to a single address. All sounders at that address will respond to commands from the panel (slave sounders) but only one sounder will be able to reply (master sounder). This is known as the 'master/slave' concept. For more information about master/slave concept, please click here. The Intelligent Base sounder: • uses the established XP95 protocol • is loop powered • is designed for use with XP95 and Discovery detectors • has a choice of two output levels: 85dB(A) or 92dB(A) • allows more sounders to be connected to the loop using the master/slave concept • can be supplied with a cap for use as a stand alone sounder (when set as a master) The Ancillary Base Sounder is a local-area sounder designed for indoor use. Provided the control panel has the required software, it can be connected to XP95 or Discovery systems. The sounder incorporates a base into which an XP95 or Discovery detector is fitted. It has a very low current draw so that up to 126 sounders may be connected to a loop. However, it does not have a synchronisation feature or pulsed tone. The Ancillary Base sounder: • has a guaranteed sound output of 85dB(A) at 1 metre • has a current consumption of only 3mA • is loop powered • responds to signals from the associated detector - it does not have an address of its own • has adjustable volume control so that its output can be adjusted steplessly from 70dB(A) to 85dB(A). The XPlorer Base Sounder is a local area sounder designed for indoor use. It incorporates an XPlorer base into which an XPlorer detector is plugged. The sounder is loop powered and is switched via the remote output of the detector so the sounder does not take up an address. It is only compatible with XPlorer detectors and control panels. • Guaranteed sound output of 85dB(A) at 1 metre • Current consumption of 3mA at 85dB(A) • Uninterrupted alternating tone • Up to 63 may be connected to a loop • Adjustable volume control means sounder output can be adjusted steplessly from 70dB(A) to   85dB(A) Click here for product literature.