The LS3/5A were designed by BBC engineers for mobile monitoring use. They needed to be compact, so they could be fitted into BBC vans. The speakers feature 5l sealed enclosure with 110mm bass driver and 19mm dome tweeter. There is nothing particularly special or amazing about each of these drivers. On the other hand, the crossover is quite complicated as most of frequency equalisation (flattening) happens there. The bass is quite modest and well controlled as you’d expect from 5l sealed enclosure. Lack of deep bass means that some tracks lack weight. It is especially noticeable on the tracks with piano and double bass sections. The lack of attack is quite noticeable too, especially if one is used to larger speakers. It is important to mention the soundstage or rather lack of it. The LS3/5A are very flat sounding speakers, even by 1970s standards. Strangely, even without the deep soundstage these speakers sound very engaging. In addition to all of the above, there is also a matter of handling power and sensitivity. Low handling power combined with low sensitivity means that you have to be careful with the volume control.
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Mint condition with box.