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JBL HLA 4895, Owner'S Manual

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JBL HLA 4895 Owner'S Manual Download Page 44

42

Appendix (A) - HLA Polarity Issues

2251J Low-Frequency Driver: Positive voltage to Red Terminal pin 2+ on the connector plate causes Outward
cone motion

2254J Mid-Frequency Driver: Positive voltage to Red Terminal pin 3+ on the connector plate causes Outward
cone motion

2451SLJ High-Frequency Driver: Positive voltage to Red Wire inside driver cover causes Inward diaphragm
motion. However, positive voltage to pin 4+ on the connector plate causes Outward motion of the diaphragm.

2242HPL Subwoofer: Positive voltage to Red Terminal or pin 1+ or 2+ on the connector plate causes Outward
cone motion

In general, HLA products follow the EIA (Electronics Industry Association) standard of positive voltage connecting
to the Red terminal and causing outward motion, while most older JBL products follow the original (reversed)
JBL polarity standard.

Summary of Contents for HLA 4895

Page 1: ...HLA 4895 4897 Horn Loaded Array System Owner Manual...

Page 2: ...Cover photo taken at Werchter Music Festival July 5 1997 EML Belgium provided 48 HLA 4895s and 24 HLA 4897s for coverage of 50 000 European music fans Photo credit Bill Gelow Guy Hawley photo model...

Page 3: ...m array design setups Page 19 Section 7 Hanging and rigging information for HLA arrays Page 29 Section 8 System transport and truck pack information Page 32 Section 9 System maintenance and repair tip...

Page 4: ...igh power operation Composite magazine A non wood speaker enclosure made of space age man made material contributes lighter overall system weight and improved rigidity Benefits include better transduc...

Page 5: ...ard box weighing 25 lbs 11 kg Connecting and lifting hardware Connecting Bars HLA CB are used in pairs to link one speaker to another With one speaker suspended above another a Connecting Bar slides i...

Page 6: ...rt XLR cables will connect them If the DSC280 is located at a control position removed from the amplifiers location 8 balanced 3 wire cables are needed to connect them This can be accomplished using 8...

Page 7: ...eries Basic Module One Channel Shown Output D Output C Output B Output A MPA600 Stereo mode MPX1200 Stereo mode MPX1200 Bridged mode MPX1200 Bridged Mode MPX1200 Bridged Mode Spare Amplifier Channels...

Page 8: ...er is cabled individually to its amplifier channel Note only one of every four 4895 three way speakers must be cabled to the amplifiers Up to three more 4895 speakers can be connected in parallel to t...

Page 9: ...eys function keys and cursor control The Edit key at the bottom right steps through the four display screens for each preset The Utility key displays the utility menu that corresponds to each of the f...

Page 10: ...ponse curves of the output bands plus three more display screens for inspecting and adjusting delay equalization and crossover parameters Each band output has parameters for setting parametric EQ dela...

Page 11: ...t can be changed to either millivolts mV or dBu on this screen On the default screen s Utility menu there is a Lock mode control as the third item in the first column With the Lock Mode set to ON the...

Page 12: ...ety of professional power amplifiers and it is not possible to know in advance which amplifiers may be chosen by a particular owner The limiter engages when each bandpass output s signal reaches the s...

Page 13: ...r individual bands can be increased or decreased by 15 dB in 0 2 dB steps for balancing the band outputs The output limiter threshold value remains set independently of the output gain IMPORTANT Diffe...

Page 14: ...to provide control for a group of 4895 speakers This application may be useful when setting up dedicated down front near fill or delay speaker systems It can also be used as a dedicated controller fo...

Page 15: ...dB 1 dB 1 dB 1 dB 2 dB Sub K2 Max Bridged 2 x 800 39 dB 1 4 dBu 1 dB 1 dB 1 dB 1 dB 1 dB 1 dB 775v Sensitivity HF M T 2400 Stereo 75 38 dB 5 4 dBu 11 dB 10 dB 9 dB 8 dB 8 dB 9 dB MF M T 5000VZ Stereo...

Page 16: ...B 11 dB 19 dB 11 dB 11 dB 18 dB Sub K2 Max Bridged 2 x 800 39 dB 1 4 dBu 19 dB 19 dB 19 dB 19 dB 19 dB 19 dB 775v Sensitivity HF M T 2400 Stereo 75 38 dB 5 4 dBu 21 dB 20 dB 19 dB 18 dB 18 dB 19 dB MF...

Page 17: ...ohms 400 W 500 W 107 dB HF 2451SLJ 1 14 16k 16 ohms 75 W 200 W 116dB Power amplifier requirements for HLA system Four 4895 three way speaker systems need only three channels of amplification one for...

Page 18: ...specification at the amplifier s two ohm rating Amplifiers can deliver a single bridged 4 ohm channel that is double its 8 ohm rating Using a bridged amplifier requires twice as many amplifiers for th...

Page 19: ...driver to conductor pair 1 Second sub woofer driver to conductor pair 2 Other connectors besides the Neutrik NL 8 can be custom ordered Examples include the ITT Cannon EP series of 4 6 and 8 conductor...

Page 20: ...three way speakers At the back of the speaker array an adapter changes the standard Socapex multi connection back into several Neutrik connectors to distribute power to the speakers One Socapex to Sp...

Page 21: ...loudspeaker systems and provides further references on this specialized subject Design and Weight Calculations HLA hardware is designed and certified with a 10 1 design ratio For example if the array...

Page 22: ...ar Chain from Hoist Inverted Electric Chain Hoist OR Other appropriate suspension method Chain or Wire Rope Bridle HLA Loudspeaker Wire Rope Spansets Shackles etc connected to appropriate connection p...

Page 23: ...ey can be used HLA was designed to be used in vertical columns The speakers should not be suspended from the Spaceframe members but rather must be only be suspended either from the Lifting Bar or dire...

Page 24: ...de to ensure the combined weight of the speakers and truss modules does not exceed the lifting capacity of the chain hoists that will be used A 4895 weighs 220 lbs 100 kg and a 4897 sub woofer weighs...

Page 25: ...with slings Slings can be made from either wire rope or synthetic polyester fiber SpanSetTM While fiber slings are lightweight easy to handle and softer on equipment their fire ratings are relatively...

Page 26: ...ehind its center of gravity will cause the array to tip forward Hanging more rows of speakers will lessen this effect Picking up the truss module group from inside points as shown in the above photo r...

Page 27: ...y If the shackle or pin is damaged it is no longer safe and should be discarded Shackles should always carry their load from the pin to the opposite end never from side to side After the top row of sp...

Page 28: ...cable to ensure they will be used together Missing or damaged quick release pins should be replaced before using the Bars The speaker cables along with the control and power cable s to the motors sho...

Page 29: ...stacked Array Construction Speaker arrays that are suspended in mid air enjoy a significant advantage in their ability to cover a listening area evenly from front to back However it is not possible t...

Page 30: ...y to lift and handle by as few as two able bodied stage hands Sliding Connecting Bars into place after stacking speakers helps to ensure their stability Regardless of how HLA units are stacked or arra...

Page 31: ...age will be obtained with a slight overlap between adjacent cabinets as shown below HLA Array Configurations and Adjustments Adjustment of adjacent HLA units can be made in increments of 5 degrees whe...

Page 32: ...an array can increase vertical coverage of the array to 45 degrees Inverting the 4895 speakers in the bottom row of an array allows waveguides in the bottom row to be angled down by 7 5 or 15 degrees...

Page 33: ...31...

Page 34: ...s are 56 inches high HLA speakers can travel stacked two high on one set of wheels with clearance of more than 108 inches 9 feet 2 75 m through doorways and in trucks Door widths of less than 34 inche...

Page 35: ...have 100 inches of internal width HLA speakers pack well in alternating rows of 3 units facing all forward then all back They can easily be stacked 2 high though removal of wheel bars on the top row m...

Page 36: ...rp point objects and that the individual HLA units are not allowed to rub against each other during transit with too much extra space You may choose to protect your HLA units with covers packing blank...

Page 37: ...HLA speakers sustain damage to the Spaceframe it will reduce their structural integrity Routine inspection for frame dents and cracked welds should be a regular part of assembling and striking arrays...

Page 38: ...back Remove the rest of the screws Carefully lift the grille from the system Take care not to lose the 4 four round black rubber spacers located between the grille and the attachment rail Step 3 Pre...

Page 39: ...with the screwdriver Step 8 Check all screws for moderate tightness and visually inspect grillframe for straightness Do final tightening of screws Do not over tighten Step 9 Restore system to upright...

Page 40: ...ers facing up 2 Remove the four machine screws holding the Driver in place 3 Remove the driver by reaching under the Magazine and pushing upwards on the magnet assembly Disconnect the two wires from t...

Page 41: ...procedure for the other side of the Waveguide 5 Install the remaining bolts Now tighten all the bolts Do not over tighten them as this may damage the Magazine 6 Re connect the High Frequency Driver Pa...

Page 42: ...t 1 Place the 2451JSLJ HF Driver on the rear flange of the Waveguide with the connector pointing in the direction of the Magazine allowing the four studs to pass through the holes in the flange 2 Atta...

Page 43: ...t 1 4 20 machine screws and tighten them evenly Be careful not to puncture the woofer cone during this process 8 Using a 1 5 V or 9V battery or a polarity checker verify the polarity of each woofer Po...

Page 44: ...to Red Wire inside driver cover causes Inward diaphragm motion However positive voltage to pin 4 on the connector plate causes Outward motion of the diaphragm 2242HPL Subwoofer Positive voltage to Red...

Page 45: ...ot used Not used 392 392 Q 0 4 0 4 dB 2 5 2 5 C2 FR Not used Not used Not used Not used Not used Not used Q dB D1 FR 1 18 1 18 1 18 1 18 Not used Not used Q 0 5 0 5 0 5 0 5 dB 0 3 3 3 D2 FR 8k28 8k28...

Page 46: ...d 4895 Bottom Panel JBL part number 380 20000 02 Tilt Arm Plunger Pin JBL part number 885 00013 00 Waveguide JBL part number 126 00090 00 Spare Drivers HF compression driver 2451SL 16 ohms Part Number...

Page 47: ...ed that you contact the ATM Group Inc and request their 1997 Catalogue and Price List ATM Group Inc Fly Ware Division 21000 South Wilmington Avenue Carson CA 90810 USA Phone 310 834 5914 Fax 310 834 3...

Page 48: ...Low Power JBL Technical Note Volume 1 No 8 Characteristics HF Compression Drivers JBL Technical Note Volume 1 No 9 Distortion Power Compression JBL Technical Note Volume 1 No 11 Controlled Power Resp...

Page 49: ...m sized venue with good acoustics for cultural show or small rock jazz or pop act Purpose Dimensions Setup HLA Array Data Symmetrical flown systems either side of stage 2x3 cluster four 4895 and two 4...

Page 50: ...k concert Purpose Dimensions Setup HLA Array Data Symmetrical flown systems either side of stage 4x4 cluster ten 4895 and six 4897 Coverage 105 H x 45 V each cluster Trim height 4m to lower edge Max S...

Page 51: ...D Purpose Dimensions Setup HLA Array Data Symmetrical flown systems either side of stage Subs stacked 6 x 5 clusters 30 4895 18 Subs stacked at stage level Coverage 120 H x 45 V each cluster Trim hei...

Page 52: ...JBL Professional 8500 Balboa Boulevard P O Box 2200 Northridge California 91329 U S A A Harman International Company MANHLA CRP 5M 8 97...

Page 53: ...e general class while offering significantly higher acoustical output power This chart compares the weight of HlA units to the following devices from other respected manufacturers Primary3 WayUnit JBL...

Page 54: ...speaker weight 2 880 Ibs Suggested power levels HF High Frequency 150 200 watts MF Mid Frequency 300 500 watts LF Low Frequency 500 700 watts Subwoofer 600 l 000 watts 4 SPEAKER UNIT SIZE The HLA enc...

Page 55: ...k per row see example 3 Without removing wheel dollies the units can be packed two high with several inches of clearance There will be some loose space on one side Maxi size drop frame semi trailers s...

Page 56: ...pean North American with 99 5 internal width mpical truck and container packing schemes scale is approximate JBL Professional 8500 Balboa Boulevard P O Box 2200 Northridge California 91329 U S A n A H...

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