Manual - Pro Audio Centre
Contents
1. 26 USB player control amp display DSP effects FX section FX send level 2 track input level FX return 6 3mm jack FX out send 6 3mm jack USB device input REC output connectors L R RCA 2 track input connectors L R RCA Power and level meter LEDs Graphic EQ frequency sliders Main Left and Right output level FX return level Phones output level Phones output stereo 6 3mm jack Phantom power switch 48V Line out 6 3mm jack 178 738UK User Manual E qtx Rear Panel DO NOT COVER OR OBSTRUCT COOLING VENTS 27 Cooling fan 27 28 Power on off switch 29 IEC mains inlet and fuse holder 28 30 Right channel SPK jack outputs 31 Left channel SPK jack outputs 29 30 31 Setting Up Connect speakers via the outputs on the rear panel 30 31 using good quality speaker leads with 6 3mm jack or SPK connectors and twin core cable recommended no smaller than 2 x 0 5mm CSA When connecting speakers to the outputs ensure that the combined load on either channel is no lower than 4 Ohms 46 To make sure of this check the manufacturer s information If connecting more than one speaker observe the following calculation method 1 1 1 Impedance of speaker 1 Impedance of speaker 2 Total Impedance Most PA and sound reinforcement speakers are 8 so we consider that 1 8 1 8 1 4 Therefore when connecting 2 x 882 speakers to a channel on the PHX series PA head the resulting total load is 4Q Wh2. 5 AVSL Group Ltd 178 738UK User Manual
3. E qtx PHX300 2 x 150W PA HEAD WITH DSP EFFECTS Item ref 178 738UK User Manual Iz z 1 se X aja 4 a a EE EN d Jom lt y lt gt 8 CHANNEL MIXER www avsl qtx com an ANSI group brand E qtx A Caution Please read this manual carefully before operating Damage caused by misuse is not covered by the warranty Introduction Thank you for choosing the QTX PHX300 PA Head as part of your sound reinforcement system This mixer amplifier is designed to offer high quality dependable service for mobile and installed systems Please read this manual fully and follow the instructions to achieve the best results with your new purchase and to avoid damage through misuse SAFETY SYMBOL AND MESSAGE CONVENTIONS CAUTION AVIS RISK OF ELECTRIC SHOCK RISQUE DE CHOC ELECTRIQUE NE PAS DO NOT OPEN OUVRIR This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit AN This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit AN Warning To prevent the risk of fire or electric shock do not expose any components to rain or moisture If liquids are spilled on the casing stop using immediately allow unit to dry out and have checked by qualified personnel before further use Avoid impact extreme pressure or heavy vibration to the case No user serviceable parts inside Do not open the case ref
4. ck input signals and condition of connection leads Power LED is on but no other LEDs kas e za doo wtant Check channel gain and EQ controls are not turned fully down P Check Master and channel level controls are not fully down Power and level meter LEDs are Check output connections to speakers lighting but no speaker output Check that speakers are in good working order Check that files are standard compressed audio format Sis plavnace tron de Check that files are standard compressed audio format _ men j Check the volume setting within the audio player Check level of input signal is not too high Red h level and E tt oanu eve wdowd rdstoted Ensure Hi Z line level input s not connected via XLR Check AUX level control and reduce if necessary Check input audio source level is not too low Output is working but at very low we TE aa Ensure low impedance line or mic signal is not connected via jack Increase channel level control and EQ settings if turned down Feedback with miaonhones Face microphone away from speakers and monitors i Reduce channel level control and or EQ level s R Disposal The Crossed Wheelie Bin symbol on the product means that the product is classed as Electrical or pzm Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life The goods must be disposed of according to your local council guidelines Errors and omissions excepted Copyright 201
5. e status 33 Repeat status 34 Folder and track number 35 EQ mode 36 USB device status 37 Track time elapsed 8 remaining 39 38 Track name 39 Playback active display NEXT PREV EQ 40 Stop key Pil VOL VOL RPT 41 Play pause key 42 Next volume key 43 Previous volume key 44 EQ repeat key 37 38 40 41 42 43 44 To begin using the USB SD audio player insert a USB pen drive with standard compressed audio files stored on it into the USB type A connector on the front panel 16 Maximum capacity 32GB Press Play Pause key 41 to alternately pause or play the current selected track Pressing the Stop 40 key will stop playback and return to the start of the track To navigate through tracks stored on the USB device press the Next or Prev keys 42 43 Pressing and holding these buttons adjusts the output volume up or down The EQ Rpt key 44 steps through preset EQ profiles for playback indicated on the LCD display Holding this key down toggles the repeat play modes also indicated on the LCD display 178 738UK User Manual E qtx Specifications Effects send 6 3mm jack REC out RCA Effects return 6 3mm jack 2TK in RCA EQ master bands 63 150 400 1k 2 5k 6 3k 16kHz stereo Master controls AKG Weight 9 4kg Troubleshooting Check power is switched on at the mains and at the rear panel Power LED is not lit 7 gt Check IEC fuse if blowing fuses refer to qualified service personnel Che
6. en 2 speakers are connected to a single output each speaker will receive half of the rated output of that channel With the power switch 28 in the Off position connect the IEC inlet 29 to the mains using the power lead provided Connect a microphone via one of the balanced XLR inputs 9 or a line input to an unbalanced jack connector 8 for each channel to be used 178 738UK User Manual E qtx Wiring for balanced mic and unbalanced line inputs are shown below XLR plug Jack plug RCA plugs Sleeve Tip H mnnn i ceam Tip 1 32 sleeve GND TIP Tip SLEEVE GND m0 Ses Operation To check an input ensure that Pan and Low High EQ controls 2 4 5 are set to the vertical 12 o clock position and the Level FX and Gain controls 1 3 6 are turned fully down Turn the Master volume controls 21 down and set all Graphic EQ sliders 20 to halfway position Some microphones and DI boxes require phantom power to operate check manufacturer s spec A Phantom power switch 25 provides 48V to all XLR inputs with an indicator to show when active Switch the mains power on 28 and check the microphone or line level input whilst increasing the Gain control 6 until the red Peak LED 7 lights when the loudest sound is produced at the input Back the Gain down control down until the Peak LED lights only momentarily on the loudest sounds The channel gain is now set to match the input source Turn
7. er all servicing to qualified service personnel Note This unit must be earthed Safety e Check for correct mains voltage and condition of IEC lead before connecting to power outlet e Speaker leads should be of good quality and have cores which are capable of full power output e Do not allow any foreign objects to enter the case or through the ventilation grilles Placement e Keep out of direct sunlight and away from heat sources e Keep away from damp or dusty environments e Ensure adequate air flow and do not cover cooling vents at the front and rear of the amplifier e Ensure adequate access to controls and connections Cleaning e Use a soft cloth with a neutral detergent to clean the casing as required e Use a vacuum cleaner to clear ventilation grilles of any dust or debris build ups e Do not use strong solvents for cleaning the unit 178 738UK User Manual Input Channel Master Section 10 11 12 13 14 15 16 17 18 USB PLAYER R N Se 3 0 YF Channel output level volume Pan control left right DSP Effects level High frequency EQ control Low frequency EQ control Channel Gain level Peak level LED indicator E qtx High impedance input e g Line instrument unbalanced 6 3mm jack Low impedance input e g Microphone balanced XLRF 19 20 21 22 23 24 Q 25 LINE OUT PHANTOM 2 6 PHX300 10 11 12 13 14 15 16 17 18 19 20 2l 22 23 24 25
8. track to the outputs is controlled by the 2 track level rotary control 13 For recording there is a REC output on L R RCA connectors 17 delivering line level stereo output A mono line output is also provided via a 6 3mm jack 26 for monitoring and further amplification For monitoring with headphones there is a stereo 6 3mm Phones jack output 24 The headphone output level is governed by the Phones level control 23 DSP effects The PHX300 has a 16 program DSP effects FX section for vocal or instrument digital effects 11 Use the UP DOWN keys to step through the 16 internal programs and ENTER to select The effects section is fed from each channel via its FX rotary control 3 and the combined input level is governed by the master FX level control 12 to avoid overdriving the DSP circuit If the internal DSP is not required this signal can be fed out of the PHX300 via the FX out jack 15 This can be used as a separate auxiliary output governed by the FX level control or as a separate mix and back into the PHX300 via the FX return jack 14 forming a send return loop A list of the internal effect programs in the PHX300 is shown below Program ma OO CHA WOW pe Je SCSC SCSCSC S S s emear OOOO C C 178 738UK User Manual E qtx USB player The PHX300 PA head has a built in audio player which can playback compressed digital audio files stored on a USB memory device 32 33 34 35 36 32 Play paus
9. up the Master volume controls up part way and gradually increase the Channel output level 1 for the microphone or line input source whilst checking the output through the connected speakers Alternatively a USB pen drive with compressed audio tracks stored can be connected to the USB Audio Player 10 for checking playback More details are shown in the USB player section below Once the sound has been checked through the speakers increase the Master volume to the required level ensuring that the LED level meter 19 doesn t continually reach into the red 7dB The red 7dB level meter LED should only ever light briefly on the loudest peaks of the sound e g bass drum beat and if it lights for anything longer than momentarily the Channel or Master levels must be reduced until it stops lighting Adjust the channel output level controls 1 to balance the mix and if required adjust the tone of any channel by boosting or cutting the Low and High controls 4 5 the vertical position is neutral Further tone adjustment for the overall mix is available via the master Graphic Equalizer 20 This section is home to 2 sets of 7 sliders which range from 63Hz to 16kHz centre frequencies Halfway up the slider is neutral top position is 12dB boost and bottom is 12dB cut of that frequency 178 738UK User Manual E qtx An auxiliary 2 track input is provided on L R RCA connectors 18 for a line level playback source The level of 2
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