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MartinLogan EFXBK Black ESL Series Premium On-Wall Electrostatic Loudspeakers (Pair)

User Manual - Page 36

For EFXBK.

PDF File Manual, 60 pages, Read Online | Download pdf file

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36GlossaryofAudioTerms
AC. Abbreviationforalternatingcurrent.
Active crossover. Usesactivedevices(transistors,IC’s,tubes)and
someformofpowersupplytooperate.
Amplitude. Theextremerangeofasignal.Usuallymeasured
fromtheaveragetotheextreme.
Arc. Thevisiblesparksgeneratedbyanelectricaldischarge.
Bass. Thelowestfrequenciesofsound.
Bi-Amplification. Usesanelectroniccrossover,orline-levelpas-
sivecrossover,andseparatepoweramplifiersforthehighand
lowfrequencyloudspeakerdrivers.
Capacitance. Thatpropertyofacapacitorwhichdetermineshow
muchchargecanbestoredinitforagivenpotentialdifference
betweenitsterminals,measuredinfarads,bytheratioofthe
chargestoredtothepotentialdifference.
Capacitor. Adeviceconsistingoftwoormoreconductingplates
separatedfromoneanotherbyaninsulatingmaterialandused
forstoringanelectricalcharge.Sometimescalledacondenser.
Clipping. Distortionofasignalbyitsbeingchoppedoff.An
overloadproblemcausedbypushinganamplifierbeyondits
capabilities.Theflat-toppedsignalhashighlevelsofharmonic
distortionwhichcreatesheatinaloudspeakerandisthemajor
causeofloudspeakercomponentfailure.
CLS. The abbreviationforcurvilinearlinesource.
Crossover. Anelectricalcircuitthatdividesafullbandwidth
signalintothedesiredfrequencybandsfortheloudspeaker
components.
dB (decibel). Anumericalexpressionoftherelativeloudnessof
asound.Thedifferenceindecibelsbetweentwosoundsisten
timestheBase10logarithmoftheratiooftheirpowerlevels.
DC. Abbreviationfordirectcurrent.
Diffraction. Thebreakingupofasoundwavecausedbysome
typeofmechanicalinterferencesuchasacabinetedge,grill
frameorothersimilarobject.
Diaphragm. Athinflexiblemembraneorconethatvibratesin
responsetoelectricalsignalstoproducesoundwaves.
Distortion.Usuallyreferredtointermsoftotalharmonicdistor-
tion(THD)whichisthepercentageofunwantedharmonicsof
thedrivesignalpresentwiththewantedsignal.Generallyused
tomeananyunwantedchangeintroducedbythedeviceunder
question.
Driver. Seetransducer.
Dynamic Range. Therangebetweenthequietestandtheloudest
soundsadevicecanhandle(oftenquotedindB).
Efficiency. Theacousticpowerdeliveredforagivenelectrical
input.Oftenexpressedasdecibels/watt/meter(dB/w/m).
ESL. The abbreviationforelectrostaticloudspeaker.
Headroom. Thedifference,indecibels,betweenthepeakand
RMSlevelsinprogrammaterial.
Hybrid. Aproductcreatedbythemarriageoftwodifferenttech-
nologies.Meanthereasthecombinationofadynamicwoofer
withanelectrostatictransducer.
Hz (Hertz). Unitoffrequencyequivalenttothenumberofcycles
persecond.
Imaging. Tomakearepresentationorimitationoftheoriginal
sonicevent.
Impedance. Thetotaloppositionofferedbyanelectriccircuit
totheflowofanalternatingcurrentofasinglefrequency.Itis
acombinationofresistanceandreactanceandismeasuredin
ohms.Rememberthataspeaker’simpedancechangeswithfre-
quency,itisnotaconstantvalue.
Inductance. Thepropertyofanelectricalcircuitbywhicha
varyingcurrentinitproducesavaryingmagneticfieldthatintro-
ducesvoltagesinthesamecircuitorinanearbycircuit.Itis
measuredinhenrys.
Inductor. Adevicedesignedprimarilytointroduceinductance
intoanelectricalcircuit.Sometimescalledachokeorcoil.
Linearity. Theextenttowhichanysignalhandlingprocessis
accomplishedwithoutamplitudedistortion.
Midrange. Themiddlefrequencieswheretheearisthemostsen-
sitive.
glossary oF audIo terMs
English
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