The four B pairs are connected via the transformer. One pair of speakers (A) is not connected to the transformer but is directly connected to the amp, these will be the main speakers. The impedance is then matched by the transformer (hence the name) so that a net 1.6 Ω load (all 5 sets of 8 Ω speakers switched on)is converted back to a 4 Ω load. Again you have to use 8 Ω speakers minimum if your amp is a 4 Ω minimum amp. WHAT IS THE TECHNICAL DEFINITION OF 'TRANSMATCH'?įor the 5 way speaker switch we don’t use parallel or series switching but use transformer coupling instead. NO – because the speaker switches are designed to have two sets or more of speakers attached to one amp, if used in reverse there is always the possibility of connecting two amps at once to one pair of speakers resulting in damage to one or both amps. AS AN AMPLIFIER SWITCHER (WE KNOW THE ANSWER IS NO, BUT WHY?) You can get 16 Ω speakers though – but it may just be easier to change the amp. NO, NEVER – you should use 12 Ω minimum speakers. These accessories use mains switches which are rated at 6A which means the max power they can handle is 288W given an 8 Ω load IF MY AMP IS RATED 6-16 Ω SHOULD I REALLY BE RUNNING A 4 Ω LOAD? IF I HAVE AN AMPLIFIER WITH MORE THAN 150 WATTS? HOW DO THE SWITCHES DEAL WITH POWER, E.G. If you only have two pairs of speakers then use the two way SERIES switch. The rule is you must always use speakers with double the impedance of the amp minimum. Check your amp – if it can cope with a 3 Ω load or less (and some can) then you are alright. ALL QED SWITCHES LOAD ON 4 Ω USING 8 Ω SPEAKERS. If you have 4 Ω speakers and a 4 Ω min amp you should always use the series switch. If you have 8 Ω speakers (and a 4 Ω min amp) you should always use the parallel switch. For the two way switches there is a choice between exclusively series or parallel versions. The switches which have more than two sets of speakers use a combination of series and parallel switching to achieve the minimum impedance of 4 Ω no matter what combination of speakers are switched on.
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