The BBC LS5/8
The LS5/8 is the BBC's flagship design, and was developed because of the need for higher sound pressure levels and greater transparency and consistency than the ageing LS5/5 offered. This was the first BBC loudspeaker to use a polypropylene diaphragm which, being lighter than Bextrene, offered greater efficiency and lower colouration. A carefully researched cone profile enables the unit to work successfully well into the midrange.
After many months of intensive development, the Graham Audio LS5/8 refines the concept further. Designed in conjunction with Derek Hughes and Volt Loudspeakers and manufactured under license in the UK, it features a unique 12 inch bass/mid unit that is married to the same 34mm Audax tweeter that is used in the LS5/9.
The design retains the same midrange clarity and balance of the LS5/9, but offers an extended bass response and greater authority at high level in larger rooms. The continuity of sound quality between the two designs means that engineers can move between the two different loudspeakers with complete confidence during the recording and mastering process.
The LS5/8 was originally conceived as an active design, but Derek Hughes has designed a passive crossover that greatly improves on the resolution and imaging of the original design while still conforming to the demanding BBC specification.
|System||2 Way, reflex loading|
|Enclosure||Thin wall construction, birch plywood|
|Finish||Real wood veneer|
|Dimensions||76cm by 46cm by 40cm|
|Frequency response||40Hz to 16kHz, ±3dB|
|Sensitivity||89dB SPL (2.83V, 1m)|
|Maximum output||Over 110dB for a pair at 2m|
|Bass/midrange||300mm Diaphnatone polypropylene|
|Tweeter||Son Audax HD13D34H|
|Recommended amplifier power||50 to 250 watts unclipped programme|
BBC monitor user guide - contains recommendations for setting up, using, and caring for your loudspeakers.
Hi-Fi Plus - October 2015
“The LS5/8 is extremely smooth across the midrange and bass, with an effortless dynamic range that only a big, easy-driving bass unit can bring.”