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Flying subwoofers at both the top and bottom of an array allows for the creation of a dipolar array, providing signif-

icant pattern control through the sub bass passband. A dipolar array results when direct radiating devices are spaced

such that their center-to-center distance is equivalent to one half wavelength within the operating bandwidth.

Dipolar sub array

3x KF750

1x SB750

1x KF755

Sub frequencies have very long wavelengths. As a result, dipolar subwoofer arrays are not typically possible.

However, by ﬂying SB750’s both at the top and the bottom of a KF700 Series array, dipolar array can be created,

providing pattern control as low as 40Hz.

This conﬁguration is not generally recommended when more than four rows of KF700 Series modules are being

used in the full range array because the dipolar array grows too large and pattern control becomes excessive in the

upper sub bass range with pronounced lobes above and below the cluster. This limits the ability to project sub

frequency information upward to the far reaches of the venue, signiﬁcantly reduces the subwoofer output in the

front rows of the venue and reduces gain before feedback from mics onstage.

When SB750’s are used above and below four rows of KF700 modules, the slight near ﬁeld attenuation can be

addressed by adding delay to the bottom rows of SB750, in essence steering the subwoofer lobe to the desired

location. In a small to medium arena, 6.5msec of delay on the bottom row of SB750’s forces the greatest subwoofer

output to FOH while providing tremendous impact in the near ﬁeld and still covering the back of the venue.

Subs flown below an array

3x KF750

2x SB750

1x KF755

Multiple rows of SB750’s can also be ﬂown from the bottom of the array. These subwoofers provide both the

coverage and impact associated with ground stacking with minimal sightline interference. However, ﬂying the

entire array out to the desired height for optimal front ﬁll coverage may place the rows of SB750’s too low for some

venues and associated staging.

Содержание KF750 Series

Страница 1: ...T h e L a w s o f P h y s i c s T h e A r t o f L i s t e n i n g E A W s K F 7 0 0 S e r i e s T o u r i n g U s a g e G u i d e...

Страница 2: ......

Страница 3: ...act as a single unit Developing and integrating the various loudspeaker modules in the KF850 KF860 and KF900 Series has led us to new ways of looking at array building that provide even coverage throu...

Страница 4: ...ing a true continuum of success Our experience has led us to develop a ve step approach to designing the appropriate array for any venue 1 D E S I G N A R R A Y C O L U M N S Design a single array col...

Страница 5: ...mize destructive interaction between array modules and produce even coverage in three space three dimensions AS3D requires that the array ampli cation be zoned in horizontal rows to permit implementat...

Страница 6: ...cluster It is alright if someone seated house right sees a handle on the house left cluster The KF700 Series loudspeakers provide a 30 horizontal pat tern that drops off very rapidly outside of this n...

Страница 7: ...in uenced by the edge events That is an impulse response measurement reveals two distinct upper mid frequency arrivals coming from the physical edges of the line source i e the top of the top module...

Страница 8: ...T h e L a w s o f P h y s i c s T h e A r t o f L i s t e n i n g E A W s K F 7 0 0 S e r i e s T o u r i n g U s a g e G u i d e INTEGRATING MODULES INTO AN ARRAY COLUMN...

Страница 9: ...riate processing and AS3D techniques will provide even coverage to the front of the venue without creating interference issues in the transition area between KF755 and KF750 coverage Dedicated down ll...

Страница 10: ...rent arrival in order to achieve appropriate summation throughout a venue IIIa GroundstackingSB750 s Many users will choose to use SB750 s in a traditional groundstacked con guration In addition to pr...

Страница 11: ...apparent impact at great distances Additional processing also allows for subwoofer beam steering Unlike conventional ground stacked subwoofers own subwoofers lose the increased output bene t provided...

Страница 12: ...ronounced lobes above and below the cluster This limits the ability to project sub frequency information upward to the far reaches of the venue signi cantly reduces the subwoofer output in the front r...

Страница 13: ...steering 6 5 msec delay on bottom row 3x KF750 1x SB750 1x SB750 1x KF755 IV UsingKF755 sforUp llCoverage Many larger venues medium and large arenas require up ll in order to reach the farthest seati...

Страница 14: ...so as to sum with the energy from KF750 column 2 rows of upfill KF755 s in a large arena 1 237 msec 1 756 msec delay differential A B C Arrival difference from A to B 1 237 msec 2x KF755 inverted 4x...

Страница 15: ...h more delay for the top row and two with less for the second row A delay unit must be carefully chosen such that the latency delay through the unit does not exceed the desired delay for the second ro...

Страница 16: ...is important to remember the visible handle rule of thumb Because the KF700 Series pattern edge exhibits dramatic attenuation the clusters can be own much closer to on stage without the feedback prob...

Страница 17: ...T h e L a w s o f P h y s i c s T h e A r t o f L i s t e n i n g E A W s K F 7 0 0 S e r i e s T o u r i n g U s a g e G u i d e AS3D ARRAY SHADING IN THREE DIMENSIONS...

Страница 18: ...tly linked to the ends of the line source If the array is short these arrivals occur close together In larger arrays the arrivals are further apart These dual arrivals create problems in areas that li...

Страница 19: ...of listening positions For the sake of legibility only three locations are shown 0 10 20 These locations are illustrated in Figure 2 Array Response Locations At 0 10 and 20 these are the listening loc...

Страница 20: ...is generated by the same computer model referenced above By implementing these simple techniques effective and extremely consistent array performance can be provided using the simple dead hung array T...

Страница 21: ...l array shading as throw distances should be relatively consistent However in venues that are particularly long or particularly narrow output levels on the short throw sides may become excessive This...

Страница 22: ...ddress the increased vertical angle associated with closer proximity to the array In an extreme situation increase the horizontal area of attenuated coverage by unplugging the gap box in the second co...

Страница 23: ...T h e L a w s o f P h y s i c s T h e A r t o f L i s t e n i n g E A W s K F 7 0 0 S e r i e s T o u r i n g U s a g e G u i d e DSP SETTINGS...

Страница 24: ...ssover 2 way crossover 2 way crossover 2 way crossover 1 Band PEQ Gain Delay Lim Comp 4 Band PEQ Gain Delay Lim Comp 4 Band PEQ Gain Delay Lim Comp Gain Delay Gain Delay Delay Delay Gain Delay Gain De...

Страница 25: ...14Hz 24dBButterworth PEQ Frequency Boost Cut Q USP 2Q Bandwidth EQ1 500Hz 8 5dB 2 2 0 99 0 52 EQ2 874Hz 5 5dB 10 6 84 0 10 EQ3 1k26Hz 3 5dB 3 6 2 49 0 28 HF GAIN 2 0dB DELAY 1 102msec HPF 1k68Hz 24dBB...

Страница 26: ...354Hz 24dBLink Riley LPF 1k47Hz 24dBButterworth PEQ Frequency Boost Cut Q USP 2Q Bandwidth EQ1 490Hz 8 0dB 2 1 1 02 0 53 EQ2 874Hz 5 5dB 10 6 84 0 10 EQ3 1k26Hz 3 5dB 3 6 2 49 0 28 HF GAIN 2 0dB DELA...

Страница 27: ...Riley LPF 1k47Hz 24dBButterworth PEQ Frequency Boost Cut Q USP 2Q Bandwidth EQ1 490Hz 8 0dB 2 1 1 02 0 53 EQ2 874Hz 5 5dB 10 6 84 0 10 EQ3 1k26Hz 3 5dB 3 6 2 49 0 28 HF GAIN 2 0dB DELAY 1 102msec HPF...

Страница 28: ...4Hz 24dBLink Riley LPF 1k47Hz 24dBButterworth PEQ Frequency Boost Cut Q USP 2Q Bandwidth EQ1 490Hz 8 0dB 2 1 1 02 0 53 EQ2 874Hz 5 5dB 10 6 84 0 10 EQ3 1k26Hz 3 5dB 3 6 2 49 0 28 HF GAIN 2 0dB DELAY 1...

Страница 29: ...earenaswherethebalcony isabovethelevelofthearray ThedelayofasinglerowofKF755up ll modulesiscalibratedtomeettheacoustic originofanarraycomprising3 high KF750 soverasingleKF755down ll module Three Over...

Страница 30: ...quire onlyminoradjustmentdependingonhow theyaredeployed PleaseseeSection2of thisGuideformoreinformationon ying orgroundstackingSB750subwoofers SB750DSPSETTINGS LF GAIN 6 0dB DELAY 0 000msec HPF 35 14H...

Страница 31: ...web www eaw com EUROPE EAW International Ltd tel 44 1494 539090 fax 44 1494 539091 T h e L a w s o f P h y s i c s T h e A r t o f L i s t e n i n g EAW is the worldwide technological and market leade...

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