MartinLogan EFXBK User Manual

Loading ...

DispersionInteractions25

dIspersIon InteraCtIons

Controlled Horizontal Dispersion

YourEFX’slauncha30degreehorizontaldispersionpattern.This

horizontaldispersionfieldgivesachoiceofgoodseatsfortheper-

formancewhileminimizinginteractionswithsidewalls(seefigure

16).Makesurebothspeakersstandexactlyatthesamevertical

angle,otherwisetheimagecanbeskewedorpoorlydefined.The

wavelaunchofbothspeakersisextremelyaccurateinboththe

timeandspectraldomain.Consequently,smallrefinedadjust-

mentscanresultinnoticeablesonicimprovements.

Controlled Vertical Dispersion

Asyoucanseefromtheillustrations,yourEFXspeakersproject

acontrolleddispersionpattern(seefigure17).EachEFXisa28

inchlinesource.Thisverticaldispersionprofileminimizesinter-

actionswiththefloorandtheceiling.

Three Major Types of Dispersion

Itisaknownfactthatasthesoundwavebecomesprogres-

sivelysmallerthanthetransducerproducingit,thedispersion

ofthatwavebecomesmoreandmorenarrow,ordirectional.

Thisfactoccursaslongasthetransducerisaflatsurface.Large

flatpanelspeakersexhibitvenetianblindeffectsduetothis

phenomenon.Thisisonereasonwhymanymanufacturersopt

forsmalldrivers(i.e.tweetersandmidrange)toapproximate

whatisknownasapointsourcewavelaunch.

Historically,mostattemptstoachievesmoothdispersionfrom

largeflatpaneltransducersresultedintrade-offs.Afterexhaus-

tivetestingof manydifferentmethods,weconceivedan

elegantlysimple,yetintenselyhandcraftedprocess.Bycurving

theradiatingsurface,wecreatetheeffectofahorizontalarc.

ThisallowstheengineersatMartinLogantocontrolthehighfre-

quencydispersionpatternofourtransducers.

Figure 12– 13. As canbeseenhere,point

sourceconceptsinviteagreatdealofroom

interaction.Whiledeliveringgoodfrequency

responsetoalargelisteningaudience,imaging

isconsequentlyconfusedandblurred.

Figure 14–15. Eventhoughtheysufferfrom

“venetianblind”effect,angledmultiplepanel

speakerscandelivergoodimaging,butonly

tospecificspotsinthelisteningarea.

Figure 16–17. Acontrolled30degreecylindri-

calwave-front,aMartinLoganexclusive,offers

optimalsounddistributionwithminimalroom

interaction.Theresultissolidimagingwitha

widelisteningarea.

English

Loading ...

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

User Manual - Page 25