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Rodgers JR149 Speakers in Edinburgh, Midlothian for sale

Audio and Video

An audio pioneer, Jim Rogers possessed real acoustic engineering talent as well as in electronics. The original Rogers folded corner horn may not offer true stereophonic reproduction, but it’s a fine room-filling beast. And as for the later flat-to-the-wall Wafer speakers, based on Philips drive units and measuring just 2in thick, these are surprisingly magicalsounding. Then there’s the JR149. Unmistakable thanks to its cylindrical shape, the JR149’s distinctive high quality wooden end caps (the brochure showed gold-coloured caps as an option) and fluted foam grill. Marketed in 1978 as a ‘technical breakthrough’, the little JR149 exhibits some strong ideas when it comes to the cabinet structure. Its a ten-litre volume design, the enclosure wall made from high grade aluminium and measuring 12in high by around 8in in diameter. An infinite baffle sealed enclosure, it is very heavily damped with thick acoustic foam. Below the decorative caps at each end of the cylinder are two fibre discs held under tension via a steel rod, which run through the enclosure from top to bottom. Crossover and cable connections are in a separate metal housing underneath the loudspeaker – matched to the rest of the speaker, as Rogers had made a round printed circuit board! Speaker inputs connect directly to this, obviating the need for terminals and extra bits of cable. On earlier speakers they were connected to the crossover via four small individual pins, later replaced by a modular four-pin connector. The crossover used pretty decent components, and had a simple wirewound preset resistor for adjusting and matching the tweeter level. The drive units used were from KEF: the classic B110 bextrene cone bass unit and matching T27 Mylar tweeter (discontinued although both are plentiful second-hand). Rogers was clearly influenced by Harry F Olson’s classic Elements Of Acoustical Engineering in respect of cabinet shape versus sound dispersion and diffraction.