QED: A SS21

A SS21 – 2 Way Speaker Switch Box | QED

$249.00

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Description

This SS21 2-Way Audiophile Parallel Speaker Switch allows you to switch between two pairs of speakers for your ultimate set up.
This is NO cheap switcher, this is a proper professional switch box which will give you ultimate switching capability, helping to create Hi Fi sound quality.
Audiophile Parallel Speaker Switch enables safe connection and independent switching of two pairs of speakers (in parallel) from a stereo amplifier using high quality gold plated banana plugs or spade connectors

QED SWITCHING FAQ
What are the differences between the speaker switches in terms of impedance?
All the speaker switches are configured so that if you use 8 Ω speakers the minimum impedance seen by the amplifier will be 4 Ω

What are the benefits of series vs parallel ?
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. For the two way switches there is a choice between exclusively series or parallel versions. If you have 8 Ω speakers (and a 4 Ω min amp) you should always use the parallel switch. If you have 4 Ω speakers and a 4 Ω min amp you should always use the series switch.

All QED switches load on 4 Ω using 8 Ω speakers. What happens if my speakers are 6 Ω?
1. Check your amp – if it can cope with a 3 Ω load or less (and some can) then you are alright. The rule is you must always use speakers with double the impedance of the amp minimum. 2. If you only have two pairs of speakers then use the two way SERIES switch.

How do the switches deal with power, e.g. if I have an amplifier with more than 150 watts?
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?
NO, NEVER – you should use 12 Ω minimum speakers. You can get 16 Ω speakers though – but it may just be easier to change the amp.

Can I use them in reverse e.g. as an amplifier switcher (we know the answer is no, but why?)
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.

What is the technical definition of ‘transmatch’?
For the 5 way speaker switch we don’t use parallel or series switching but use transformer coupling instead. Again you have to use 8 Ω speakers minimum if your amp is a 4 Ω minimum amp. 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. 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 four B pairs are connected via the transformer.

Brand

QED

QED - Hi-Fi And Home Cinema Cables

Founded by Bob Abraham and Ian Vine in 1973; QED has, over the past 40 years, acquired unparalleled knowledge and experience of hi-fi and home cinema cables and connectivity.We can also legitimately claim that, during this period, we have changed people’s perspectives about hi-fi cables. Consumers no longer believe that ‘bell wire will do’ or that ‘any old cable will be fine’. This understanding that cable quality is important and makes a real difference to your enjoyment began with the launch of the QED 79 strand speaker cable in 1978. QED’s reputation for both innovation and technical excellence is known throughout the world. The latest computer aided design techniques allow our research and development team to keep pace with technological advances and deliver products that achieve the highest levels of performance and reliability. This is why QED speaker cables and interconnects are recommended by so many of the world’s leading manufacturers of hi-fi and home theatre equipment, and also why so many of our products have won prestigious awards. For your convenience, and to better understand the different cable products we offer, we have divided them into four separate ranges: Profile, Performance, Reference and Supremus

Additional information

Price Bracket

200-600

Minimum Load Impedance – 4 Ω (using two pairs of 8 Ω speakers)

Power Rating: 150 Watts RMS

Silver Plated Switch Contacts

Binding Post Terminals (Can Be Used with 4 mm Speaker Plugs)
Dimensions (HxWxD): 55 mm x 157 mm x 170 mm

Suitable for Use with the WM14 Wall Mounted Volume Control

Suitable for Bi-Wiring (Spade + Banana)

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