nicknamed designed manufactured known reproduction low bass frequencies demanding launched maiden flagship based named loading principle invented 1950s speaker exists destined professional market discontinued remains popular history manufacturers sought produce quantum bass output products seeking clear low frequency bass design bass way fundamental resonance quest extra octave dry extended bass sound accurate reproduction resulted launched original year following release product domestic monitor system designed driven home setting incorporated crossover cabinet professional monitor system launched destined professional market internal crossover configuration opens driving options particular active operation tri named employs loading principle invented 1950s bass units mounted sealed container driven parallel effectively double speaker enclosure volume extend bass frequency response possible identical speakers variant principle patented use bass drive units facing forward arrangement early crossover boards nominal designed lie flat base stands change original distinction disappeared designation discontinued remained price lists speaker discontinued speaker little performance specifications mentioning somewhat frequency response varies loading extending usable bass response claimed low distortion high sound pressure levels recommended power rating range pleasure noted speakers quoted nominal considerably parts audio spectrum hard drive potentially causing output protection trip equally heavy twice power hungry demands happened perfect match high current delivery capabilities near short circuits famously acid test budget priced launch 1970s available number sold corporate philosophy intended significant dealer involvement customer education decision making included teaching customers listen correctly musical attributes trial evaluation product prior purchase dealer expert installation considered important parts value added end products instructions supplied product including stands crossover priced design way system employing individual drive units drivers driver frequency range faces forward second mounted surface enclosure bass unit hidden view bass units loaded mounted terminated transmission line crossover points set upward firing drivers designed aid improve axis listening experience like developed 1970s 80s designed work best near room boundaries manufacturer advise positioning speaker close rear wall approximately feet corners trade solid stereo image declared designed work tight wall merit according maintained design manufacture buy sell positively review installed away room boundaries fool early product recommended tri configuration fed way electronic crossover typically pair doubled bass units introduction pack configuration started manufacturing electronics release crossover declared system comprises source components plus crossover power pair necessary cables construction cabinet measures inches extremely rigid cabinet constructed high density particle board strategically places extensively according manufacturer array stressed steel rods inside enclosure control energy flows techniques employed ensure energy caused unwanted motion panel drivers cancelled similar opposite energy upward facing units resulting minimum initially factory manufacturing later furniture makers glasgow speaker uses bought drivers rebuilt stronger materials drivers metal treated reduce effects vibration enclosure designed constructed control energy drive units sourced kit form kits cabinet found fragile replaced robust better sounding short run scan speak later changed sourced denmark known use bbc monitor diameter unit applied layer unit cabinet weighs kilograms designed placed stands centimetres tall positioned listener ear level speaker supplied heavy stands square cross section spikes fitted prior positioning speaker cabinet input connections established pin later versions version banana image product revisions launched revised cabinet style launched enclosure cabinet changed smaller launched unit unit unit replaced common earth cannon unit fitted nuts jan cabinet changed sides units sound material painted bass units crossover units circuit board wider tracks improved layout new units response logo incorporated plate cabinet improved internal sealing units harder rubber surround cabinet crossover moved compartment speaker replaces crossover new external crossover fitted stand facility tri discontinued driven actively discontinued speaker addition stone changed improved cabinet non discontinued source reception received opinions news noted speaker kept promise managing play lowest bass guitar notes impression unlimited bass extension active system source electronic regarded pinnacle flat systems speaker integral general went equipment products product concurrent life way design physically smaller product measuring required tall speaker stands launched entry level non speaker drive units big brother released discontinued late 1980s worked replacement project bearing final product bear technology mentioned marketing materials product manual products bearing trade marked include active
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