Acoustic systems, namely, acoustic conduits; tweaks for improving the acoustic in the nature of sound amplifying apparatus; passive and active loudspeakers; electrical cables for interconnection of audio-related devices and speakers; sound amplifying apparatus; amplifiers, preamps being pre-amplifiers and analog to digital converters (ADCs)

'acoust':1,4,10 'activ':20 'adc':47 'amplifi':16,34,36,41 'analog':43 'apparatus':17,35 'audio':28 'audio-rel':27 'cabl':23 'conduit':5 'convert':46 'devic':30 'digit':45 'electr':22 'improv':8 'interconnect':25 'loudspeak':21 'name':3 'natur':13 'passiv':18 'pre':40 'pre-amplifi':39 'preamp':37 'relat':29 'sound':15,33 'speaker':32 'system':2 'tweak':6

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