MartinLogan EFXBK User Manual

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GlossaryofAudioTerms37

Passive crossover. Usesnoactivecomponents(transistors,IC’s,

tubes)andneedsnopowersupply(AC,DC,battery)tooperate.

Thecrossoverinatypicalloudspeakerisofthepassivevariety.

Passivecrossoversconsistofcapacitors,inductorsandresistors.

Phase. Theamountbywhichonesinewaveleadsorlagsasec-

ondwaveofthesamefrequency.Thedifferenceisdescribedby

thetermphaseangle.Sinewavesinphasereinforceeachother;

thoseoutofphasecancel.

Pink noise. Arandomnoiseusedinmeasurements,asithasthe

sameamountofenergyineachoctave.

Polarity. Theconditionofbeingpositiveornegativewithrespect

tosomereferencepointorobject.

RMS. Abbreviationforrootmeansquare.Theeffectivevalueofa

givenwaveformisitsRMSvalue.Acousticpowerisproportional

tothesquareoftheRMSsoundpressure.

Resistance. Thatpropertyofaconductorbywhichitopposesthe

flowofelectriccurrent,resultinginthegenerationofheatinthe

conductingmaterial,usuallyexpressedinohms.

Resistor. Adeviceusedinacircuittoprovideresistance.

Resonance. Theeffectproducedwhenthenaturalvibrationfre-

quencyofabodyisgreatlyamplifiedbyreinforcingvibrationsat

thesameornearlythesamefrequencyfromanotherbody.

Sensitivity. The volumeofsounddeliveredforagivenelectrical

input.

Stator. Thefixedpartformingthereferenceforthemovingdia-

phragminaplanarspeaker.

THD. The abbreviation fortotal harmonic distortion.(See

Distortion)

TIM. The abbreviationfortransientintermodulationdistortion.

Transducer. Anyofvariousdevicesthattransmitenergyfromone

systemtoanother,sometimesonethatconvertstheenergyin

form.Loudspeakertransducersconvertelectricalenergyinto

mechanicalmotion.

Transient. Appliestothatwhichlastsorstaysbutashorttime.A

changefromonesteady-stateconditiontoanother.

Tweeter. A small drive unit designed to reproduce only

highfrequencies.

Wavelength. Thedistancemeasuredinthedirectionofprogres-

sionofawave,fromanygivenpointcharacterizedbythesame

phase.

White noise. Arandomnoiseusedinmeasurements,asithasthe

sameamountofenergyateachfrequency.

Woofer. Adriveunitoperatinginthebassfrequenciesonly.Drive

unitsintwo-waysystemsarenottruewoofersbutaremore

accuratelydescribedasbeingmid/bassdrivers.

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

User Manual - Page 37