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QSC Audio Products LLC

Application Engineering Team

Application: Stereo passive tops and subs with two monitor mixes

• Two 4

Ω

medium-power double-woofer passive tops, stereo

• Two 4

Ω

high-power double subwoofers, stereo

• Two 8

Ω

medium-power passive monitors, two mixes

Equipment

Current draw

120 V / 230 V

Rack

spaces Total watts

Weight

Old paradigm

Two low-power two-chan-
nel amps + high-power
two-channel amp

~12.5 A / ~6.2 A 7

3100

~140 lb

New paradigm

Two PLD4.2

9.3 A / 4.6 A

4

5000

37 lb

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Summary of Contents for PLD Series

Page 1: ...PLD Series Power Amplifier Application Guide for Portable PA www qsc com ...

Page 2: ... Team Address QSC Audio Products LLC 1675 MacArthur Boulevard Costa Mesa CA 92626 1468 USA Main Switchboard Tel 800 854 4079 US and Canada Tel 1 714 754 6175 Fax 1 714 754 6174 E Mail info qscaudio com Application Engineering E Mail AET_team qsc com ...

Page 3: ...ors on one mix 24 Application Stereo full range mains with four monitor mixes 25 Application Stereo passive tops and subs with two monitor mixes 26 Application Stereo passive tops and mono sub 27 Application Stereo passive tops and two mono subs 28 Application Stereo bi amp mains 29 Application Stereo bi amp mains with two monitor mixes 30 Application Mono bi amp tops and sub 31 Application Stereo...

Page 4: ...S and other countries Felxible Amplifier Summing Technology Intrinsic Correction and Amplifier Navigator are trademarks of QSC Audio Prod ucts LLC Windows is a registered trademark of the Microsoft group of companies Mac is a trademark of Apple Inc registered in the U S and other countries Speakon is a trademark of Neutrik All other marks are property of their respective owners ...

Page 5: ...ent years have increasingly met levels of performance and reliability that were impossible some 20 or 30 years ago The PLD Series amplifiers from QSC take it all a few steps further while adding such versatile features as digital signal pro cessing Flexible Amplifier Summing Technology FAST and particularly high power and channel density The three models in the PLD range are the PLD4 2 the PLD4 3 ...

Page 6: ...r density Among professional power amps the most common size is 2RU and the vast majority also have two audio channels That means that if you happen to need say eight channels of amplification you ll need at least 8 rack spaces in your equip ment racks maybe even more if they are very high power 3 RU or 4 RU models But imagine with PLD you could now have those same eight channels of ampli fication...

Page 7: ...re external devices The processing functions available include Five bands of parametric EQ per channel High and or low pass filtering with choice of frequency slope and filter type High and low shelving are also avail able Limiting with selectable threshold and ratio as well as selectable power limiting Delay up to 75 ms on each channel Weight savings Some of us remember when even a 1 000 watt amp...

Page 8: ...cations Block diagram From input to output the PLD Series power amps are unique The electronically balanced inputs feed an analog input cir cuit with selectable sensitivity at maximum gain either 4 dBu 1 23 V or 14 dBu 3 88 V or selectable maximum voltage gain 26 dB 20 29 dB 28 32 dB 40 or 35 dB 56 These settings also help scale the input signal more optimally to the analog to digital converter AD...

Page 9: ... inefficiencies in the device In devices where the current waveform is still sinusoidal but shifted out of phase with the voltage as often happens with AC motors under various load conditions or is not sinusoidal as with most electronic power supplies the power factor is somewhat less than 1 That means the AC mains actually have to deliver more current than what actually gets used as power This ma...

Page 10: ...mounts of current The narrow conduction time in the rectifiers of a non PFC power supply above results in sharp current peaks below Power factor correction An advantage of switch mode power supply technology used in the PLD4 3 and PLD4 5 amplifiers is that we design power factor correction into them the current flows throughout the whole voltage waveform and not only at the peaks Conventional non ...

Page 11: ...ue of the signal The pulse stream switches the output transistors fully on and off so they dissipate very little power even at high output levels A passive network of inductors and capacitors smooths out the pulses to reconstruct the audio signal The PLD4 3 and PLD4 5 amplifers use a custom proprietary dual output transistor device on each channel which compris es a precisely matched pair of MOSFE...

Page 12: ...hey re connected together A power amp is a voltage source as is a battery The difference is that while the battery puts out a constant DC voltage the power amp puts out a varying voltage in the form of an audio signal But FAST allows you to use techniques that you might be familiar with in using batteries to multiply the versatility of the amplifier Single For example a battery has a given output ...

Page 13: ... sources in parallel however double the available current In PLD amplifiers parallel is suitable for load impedances of 2 to 4Ω Paralleling three or four amp channels triples or quadruples the available current respectively but does not increase available voltage In PLD amplifiers this technique can be used for driving extremely low load impedances of 1 to 2Ω Parallel Doubling up in parallel inste...

Page 14: ...h parallel and series This doubles the voltage and the current potentially quadrupling the available power to the load Arranging four voltage sources in a combined series parallel arrangement doubles both available voltage and current In PLD amplifiers this is suitable for harnessing the power of all four channels to drive high power loads of 4 to 8Ω ...

Page 15: ...ier Navigator offers a complete selection of operations Amp firmware check and update Input configuration Output configuration including preset selection editing and saving Selecting and editing loudspeaker profiles Copying and transferring configurations among amps Logging of AC mains heat sink temperatures run time load impedances etc Diagnosis Amplifier Navigator is available for both Mac and t...

Page 16: ...l C and Input 4 to channel D F2 Channels A and B parallel C and D separate Suitable for a high power 2 4Ω full range loudspeaker load and two separate full range loudspeaker loads of any impedance 2Ω or higher Input 1 goes to the parallel channels A and B Input 3 to channel C and Input 4 to channel D F3 Channels A and B bridged C and D separate Suitable for a high power 4 8Ω or higher full range l...

Page 17: ...LF plus channel B HF channel C LF plus channel D HF This preset uses all four output channels separately with these input and DSP settings Input 1 feeds channels A and B input 2 feeds channels C and D The crossover filter parameters are 1 5 kHz Butterworth with slopes of 48 dB octave These parameters are only a starting point you can alter any of them and save the configuration into a user preset ...

Page 18: ...channels C and D These parameters are only a starting point you can alter any of them and save the configuration into a user preset F15 Single bi amp mode Channels A and B bridged for 4 8Ω LF channels C and D bridged for 4 8Ω HF This is similar to F6 with these additions Input 1 goes to the bridged channels A and B with a 48 dB octave Butterworth low pass filter at 1 5 kHz Input 2 goes to the brid...

Page 19: ...z 48 dB octave But terworth high pass to 1 5 kHz 24 dB octave Butterworth low pass Channel D has a high pass filter at 1 5 kHz 48 dB octave Butterworth All the channels get their signal from Input 1 These parameters are only a starting point you can alter any of them and save the configuration into a user preset F19 Channels A and B bridged for 4 8Ω subwoofer channels C and D bridged for 8Ω subwoo...

Page 20: ... drivers with larger voice coils can generally handle higher power than those with smaller ones The dust cap in the center of the cone may or may not be the same diameter as the voice coil consult the manufacturer s spec sheet to be sure of woofers Impedance Recommended Amp Power Configuration Medium power 1 8Ω 200 to 400 watts PLD4 2 single channel 2 4Ω 400 to 800 watts PLD4 3 single channel High...

Page 21: ...ve tops and subs Two 8Ω medium power single woofer passive tops stereo Two 8Ω medium power single subwoofers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two medium power two channel amps 8 A 4 A 4 1200 80 lb New paradigm PLD4 2 4 6 A 2 3 A 2 2000 18 5 lb ...

Page 22: ...onitor mixes Two 8Ω medium power single woofer passive full range stereo Two 8Ω medium power passive monitors two mixes Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two medium power two channel amps 8 A 4 A 4 1200 80 lb New paradigm PLD4 2 4 6 A 2 3A 2 2000 18 5 lb ...

Page 23: ...es Two 8Ω medium power single woofer passive tops stereo Two 8Ω medium power single subwoofers mono Two 8Ω medium power passive monitors two mixes Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two medium power two channel amps 11 A 5 5 A 4 1650 80 lb New paradigm Two PLD4 2 9 4 A 4 7 A 4 5000 37 lb ...

Page 24: ...m power single woofer passive tops mono Two 4Ω medium power double subwoofers mono Two 8Ω medium power passive monitors one mix Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two low power two chan nel amps high power two channel amp 11 A 5 5 A 7 2800 140 lb New paradigm PLD4 2 4 7 A 2 3 A 2 2600 18 5 lb ...

Page 25: ...s Two 4Ω medium power double woofer passive full range mains stereo Four 8Ω medium power passive monitors four mixes Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two low power two chan nel amps high power two channel amp 12 5 A 6 2 A 7 3100 140 lb New paradigm Two PLD4 2 9 3 A 4 6 A 4 5000 37 lb ...

Page 26: ...r double woofer passive tops stereo Two 4Ω high power double subwoofers stereo Two 8Ω medium power passive monitors two mixes Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two low power two chan nel amps high power two channel amp 12 5 A 6 2 A 7 3100 140 lb New paradigm Two PLD4 2 9 3 A 4 6 A 4 5000 37 lb ...

Page 27: ...no sub Two 8Ω medium power single woofer passive tops stereo One 4Ω high power double subwoofer Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Medium power two channel amp High power two channel amp bridged 19 A 9 5 A 5 4200 110 lb New paradigm PLD4 2 4 7 A 2 3 A 2 2200 18 5 lb ...

Page 28: ...Two 4Ω medium power double woofer passive tops stereo Two 8Ω high power single subwoofers mono Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Medium power two channel amp High power two channel amp bridged 21 A 10 5 A 5 4650 110 lb New paradigm PLD4 3 5 A 2 5 A 2 4800 21 lb ...

Page 29: ...n Stereo bi amp mains Two 4Ω 8Ω high power double woofer bi amp mains stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Low power two channel amp High power two channel amp 13 A 6 5 A 5 2750 100 lb New paradigm Two PLD4 2 4 7 A 2 3 A 4 5200 37 lb ...

Page 30: ...s Two 8Ω high power single woofer bi amp mains stereo Two 8Ω high power passive monitors two mixes Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two low power two channel amps High power two channel amp 13 A 6 5 A 7 2100 135 lb New paradigm Two PLD4 3 4 6 A 2 3 A 4 9400 42 lb ...

Page 31: ...high power single woofer bi amp tops mono One 4Ω high power double woofer subwoofer Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Low power two channel amp High power two channel amp 13 A 6 5 A 5 2750 100 lb New paradigm PLD4 3 4 7 A 2 3 A 2 5600 21 lb Alternative 4 pole connection ...

Page 32: ...on Stereo full range mains Two 4Ω medium power double woofer passive main loudspeakers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm High power two channel amp 10 A 5 A 3 2400 65 lb New paradigm PLD4 3 4 4 A 2 2 A 2 3600 21 lb ...

Page 33: ...sive tops and subs Two 8Ω high power single woofer passive tops stereo Two 8Ω high power single subwoofers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two high power two channel amps 13 A 6 5 A 6 2800 130 lb New paradigm PLD4 5 6 8 A 3 4 A 2 4800 22 lb ...

Page 34: ...and subs Two 4Ω high power double woofer passive tops stereo Two 4Ω high power double subwoofers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two high power two channel amps 13 A 6 5 A 6 2800 130 lb New paradigm Two PLD4 3 10 6 A 5 3 A 4 8000 42 lb ...

Page 35: ...reo bi amp mains Two 8Ω high power single woofer bi amp loudspeakers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two high power two channel amps 13 A 6 5 A 6 2800 130 lb New paradigm PLD4 5 6 8 A 3 4 A 2 4800 22 lb Alternative 4 pole connection ...

Page 36: ...on Stereo bi amp mains Two 4Ω high power double woofer bi amp loudspeakers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Two high power two channel amps 13 A 6 5 A 6 2800 130 lb New paradigm Two PLD4 3 4 8 A 2 4 A 2 3100 42 lb ...

Page 37: ...ngle woofer bi amp loudspeakers stereo Two 8Ω high power single subwoofers mono Two 8Ω high power passive monitors one mix Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Low power two channel amp Two high power two channel amps 19 5 A 9 7 A 8 4150 165 lb New paradigm Two PLD4 3 4 4 A 2 2 A 2 7400 42 lb Alternative 4 pole connection ...

Page 38: ... woofer bi amp loudspeakers stereo Two 4Ω high power double subwoofers stereo Equipment Current draw 120 V 230 V Rack spaces Total watts Weight Old paradigm Low power two channel amp Two high power two channel amps 23 A 11 5 A 8 5150 165 lb New paradigm Two PLD4 5 13 6 A 6 8 A 2 11200 44 lb Alternative 4 pole connection ...

Page 39: ...09 dB Maximum gain 4 dBu sensitivity 34 dB 38 4 dB 38 4 dB Damping factor 8Ω load 150 150 150 Input impedance 10 kΩ balanced or unbalanced 10 kΩ balanced or unbalanced 10 kΩ balanced or unbalanced Maximum RMS input level 3 9 V 14 dBu setting 12 28 V 24 dBu 12 28 V 24 dBu 12 28 V 24 dBu 1 2 V 4 dBu setting 3 88 V 14 dBu 3 88 V 14 dBu 3 88 V 14 dBu Controls and indicators front Power Channel MUTE bu...

Page 40: ...QSC Audio Products LLC Application Engineering Team qsc com ...

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