USER GUIDE - Maxking Limited
Contents
1. e Left Bass LO Select same Speaker frequency 100 or 150Hz on both Amplifiers Right Bass LO Speaker PARALLEL BRIDGE PIN1 INPUTS PIN2 XOVER ON Select LO Switch IN Switch IN STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series 2 way Monitor Mix Monitor Outputs 1 100 5 100 e e E L CUM e e e e Total Load on each channel NOT less than 2 Ohms XOVER TO CH A AMP CUM eooeeeo CDM CH e e e OFF LIMITER XOVER OUTPUT ON OFF INPUT A e ink LO GND PARALLEL 100Hz LIFT _ Q INPUTS 1502 HI e e PE OFF LIMITER XOVER OUTPUT ON 8 LINK LO LO eg If each monitor is 8 Ohms then 8 divide 2 4 A maximum of 4 8 Ohm monitors per channel can be used XOVER TO CH B AMP CH INPUT B Monitor Stereo Bi amp with Mono Sub Bass Left XOVER ON Select HI Switch IN Switch OUT 100 5 1o 5 100 100 Q9 e CDM o 6 6 e e e CDM Mono Out INPUTA GND PARALLEL LIFT INPUTS i 0 LINK 6 BRIDGE PIN 12. 1000 Hertz 1kHz 1000 cycles per second The size of a signal at any given point in an audio system A signal level higher than microphone level used to interconnect equipment A typical level of semi pro equipment is 10dBV while pro equipment is usually 4dBu and often balanced Typical line levels can be from 100mV to 4V 15 to 15dBu Single channel sound reproduction short for monaural The speakers used by the performers or operator to hear signals in a recording studio or on stage Also used in live sound as an alternative name for FOLDBACK Any sound you didn t want hiss hum etc A unit of electrical resistance 1000 Ohms 1kOhm or 1000W 1kW A measure of the ratio of Voltage and Current in a circuit or component Resistance Ohms Voltage Current Root Mean Square The method normally used to measure AC Voltages The interference suppressing outer conductor in mic and line cables The connectors or controls used to send a signal connected externally to a mixing console The ratio used to describe the relationship between the level of a signal and the background noise that accompanies it A high quality connector designed for use with high power amplifiers and loudspeakers Sound Pressure Level Two channel sound reproduction where the two signals are sent to separate left and right speaker systems Tip Ring Sleeve 1 4 three pole jack plug Often referred to as a stereo jack plug
3. 2 6 9 0 6 6 6 Comme DHT OS e e INPUT B e Bass LO Use ONLY Channel Speaker output Note special wiring Select same frequency 100 or 150Hz on both Amplifiers ______ PARALLEL INPUTS s INPUT B e LINK XOVER ON Select LO Select BRIDGE Switch IN Switch IN Switch IN STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series T 2 way Stereo with additional Amplifiers Left Mid HI Right Speaker Mid HI Speaker XOVER TO CH A AMP OFF GND H PARALLEL 100Hz Q LIFT INPUTS m 150Hz XOVER TO CH B AMP gt Left Bass LO Speaker XOVER ON Switch IN Left Right Bass LO Speaker 100 5 100 5 1o 5 e e re d INPUT A ink A GND PARALLEL BRIDGE PIN1 LIFT 0 INPUTS PIN2 R A e e ETIN CDM 0 6 e e ore us E Clee 0 0 6 6 6 CUM 650906969290 CUM 6 0 0 6 1111 t diie 5 INPUT B Select LO Switch IN L eft Bass LO Speaker Right Bass LO Speaker XOVER TO AMP OFF ON INPUT A e uw GND PARALLEL JM 100
4. J LO 100 2 1 B 150H I 11 12 13 14 e RIDGE PIN1 2 CH A PIN2 H 73542 ZA e o y x o y Q B NS 2 SA LO LO e 12 13 Speaker Wiring Each channel uses SPEAKON NL4 connectors Using cable as specified See CABLES speaker connections are as follows Each channel connected individually to a speaker PIN 1 Positive PIN 2 Not used PIN 1 Negative PIN 2 Not used Two Speakers connected to both channels in a single 4 core cable Use only Channel A connector wired Channel A PIN 1 Positive Channel B PIN 2 Positive Channel A PIN 1 Negative Channel B PIN 2 Negative Bridged operation Use only Channel A connector wired PIN 1 Positive PIN 2 Negative PIN 1 Not used PIN 2 Not used Always ensure speaker cables are wired the same way When any cable has the pin wiring reversed some speakers will be out of phase usually resulting in a loss of volume or bass Circuit Breaker will only activate if the amplifier has developed a fault or been driven too hard into very low speaker impedances The button on the circuit breaker will protrude approximately 6mm when tripped Check speaker wiring and load before re setting To reset turn off the amplifier power switch and push in the reset button If the breaker trips again the amplifier could have developed a fault If this happens refer to the Se
5. a pro audio mixer adjust the level controls to a position compatible with the mixer metering A suggested starting position for the level controls is 10 Ventilation It is essential that air can circulate freely around the amplifier to provide adequate cooling The fans take air in from the rear of the amplifier and exhaust through the front panel Both the front and rear ventilation holes must not be obstructed When the amplifier is rack mounted care must be taken to ensure that the rack is open at the front and rear to allow sufficient air flow In some installations racks are fitted with covers for security reasons If these restrict the air flow in any way they must be removed while the amplifier is in operation Where multiple amplifiers are installed in a rack additional forced ventilation or a source of fresh cooling air may be required Protect LEDs Operate independently and show that the speaker outputs have been muted resulting in no sound They illuminate under the following conditions 1 When the amplifier is turned on After a couple of seconds the LEDs will turn off showing normal operation 2 If the amplifier has reached an over temperature condition the volume of one or both channels will rapidly reduce resulting in little or no sound Once the fans cool down the heatsinks normal operation will resume However if the transformer has overheated then it can take a few hours to cool 9 If a fault has occurred on on
6. the ear s varying sensitivity to different frequencies which is most pronounced at low volumes A standard reference voltage 0 775 V rms Derived from the earlier dBm which was used to measure the power in 600ohm circuits A standard reference voltage 1V rms Front of House The speaker system which is used to project the sound from the stage to the audience It is also used to describe the position in front of the stage where the main mixing console is situated Sound which is sent from the main mixing position back to the stage so the performers can hear it Often with a large sound system an entirely separate foldback or monitor system with a dedicated console is located on one side of the stage so the performers can communicate easily with the operator Earth A measurement of frequency 1Hz 1 cycle per second The treble or high frequency content of a sound or the speakers often compression drivers attached to horns or flares used to reproduce it The positive phase of a signal Usually the red wire in a screened cable STUDIOMASTER AX Amplifier Series IMPEDANCE KILOHERTZ kHz LEVEL LINE LEVEL MONO MONITOR NOISE OHM RESISTANCE RMS SCREEN SEND SIGNAL TO NOISE SPEAKON SPL STEREO TRS TS UNBALANCED XLR Similar to resistance except that impedance also reflects the effect of any inductance or capacitance in the circuit A measurement of frequency
7. the wall supply and switched on 2 Check A C power cord mains lead is fully pushed into the amplifier socket B Check that the amplifier is switched on 4 UK only Check fuse in the mains plug 5 Check A C supply house breaker fuse No sound ils Check that the signal source from mixer CD player etc is working 2 Check that the LEVEL control s are not in the minimum anti clockwise position 3 Check that the speakers are connected correctly Distorted sound and PEAK LEDs illuminated 1 Possible short circuit on speaker cable or cabinet Change speaker cable and check cabinet 2 If only on channel A check a 4 core speaker cable is not being used with a speaker that links PIN1 to PIN2 of the Speakon connector One or Both Amplifier channels stop working briefly one or both Protect LEDs illuminate briefly 1 Check the ventilation holes both front and rear for good air flow 2 Check that the speaker load on each channel is not less than 2 ohms 3 Check that the amplifier is not being over driven red peak LEDs should not be illuminated continuously Amplifier stops working and one or more PROTECT LEDs are illuminated 1 The amplifier is in an over temperature or fault condition See PROTECT LED section for more information STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Service Information If you have a problem with your Studiomaster product or think it ha
8. 5V Distortion THD 1kHz rated power 0 01 0 01 0 02 1 channel driven Frequency Response 20Hz 20kHz 0 0 5dB 0 0 5dB 0 0 5dB Signal to Noise Ratio unweighted Ref Rated Power 4 ohms 100dB 100dB 100dB Crosstalk 1kHz 80dB 80dB 80dB Damping Factor Ref 1kHz 8 ohms 200 200 200 Crossover Selectable 100 150Hz 3rd order filter STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Technical Specification AX1500 AX2500 AX3500 Input Filter 3rd order 18dB octave 3dB 35Hz 35Hz 35Hz Input Impedance 10k Unbal 10k Unbal 10k Unbal 20k Bal 20k Bal 20k Bal Voltage Gain 35dB 3 dB 39dB Cooling Continuously variable speed Twin Fans back to front airflow Amplifier Protection Full short circuit open circuit thermal ultrasonic and RF protection All units are stable into mismatched or reactive loads Load Protection Power up down muting Output Curcuit type AB H 2 H 3 AB Class AB complementary linear output H 2 Class AB complementary linear output with Class H 2 step high efficiency circuit H 3 Class AB complementary linear output with Class H 3 step high efficiency circuit Dimensions 19 48 3cm width 2U 3 5 8 9cm height 15 5 39 4cm depth rack mounting to rear rack ears Weight Shipping 20 2kg 44 4165 23 6kg 51 9105 26kg 57 2lbs Net 16kg 35 2lbs 19 4kg 42 7105 21 8kg 48lbs Power Requirements 230V Model 220 240V AC 50 60Hz 120V Model 110 127V A
9. 6 6 5 COH e e e XOVER TO CHA AMP OFF ON JL HI 100Hz Q m 150Hz XOVER TO CH B AMP HI o LIMITER XOVER OUTPUT e lt HI Lo LO INPUT ink GND PARALLEL LIFT Q INPUTS BRIDGE PIN 1 PIN IN2 PIN 1 PIN 1 INPUT B e ink Left Speaker gt Left Speaker STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Mono Bi amp Select HI Switch OUT Mid HI opeaker 5 100 6 XOVER Switch IN e E L e CUM COO e CDM 6 0 e e e Bass LO Speaker CUM 6 CDM 0 0 6 COMM 600666 e e e e PARALLEL INPUTS 9 LIMITER XOVER OUTPUT LO Parallel Switch IN Select LO Switch IN Stereo Bi amp Left XOVER ON Select HI Switch IN Switch OUT 1o 1o 5 e 9 b bs RE Um CDM e e e m a CDM 6 INPUTA PARALLEL INPUTS Q GND LIFT CEH
10. C 50 60Hz Power Consumption 230V AC 1 3 power pink noise 4 6A TA 8 2 double the current rating for 120V models STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Glossary of Technical Terms AC or a c AC POWER SUPPLY BALANCED BANDWIDTH BRIDGE BRIDGED COLD DECIBEL dB dBA dBu dBV F O H FOLDBACK GROUND HERTZ Hz HIGH or TOP HOT Alternating current Local electrical supply Balanced 3 connection circuitry is widely used in audio equipment from cheap dynamic microphones to top quality studio devices The balanced system is used as it cancels outside interference in the connecting cables resulting in a cleaner signal The bandwidth is the range of frequencies that will pass through a piece of equipment In bridged mode both channels of the amplifier are combined to provide the total power of the amplifier into a single load The negative phase of a signal Usually the black wire in a balanced cable For an unbalanced signal the SCREEN is used for the COLD connection A logarithmic method of measurement for acoustics and electronics One decibel 1 10th of a Bel is the standard change in loudness perceptible by the human ear although trained ears can detect smaller changes OdB acoustic is the threshold of human hearing at mid range frequencies The most commonly used unit for measuring sound pressure levels The A weighting takes account of
11. Hz LIFT Q INPUTS 150112 11 XOVER TO CH B AMP Aa OFF CH INPUT B STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Notes STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Notes STUDIOMASTER AX Amplifier Series by RSD Recording Studio Design Limited 7 Eden Way Pages Industrial Park Leighton Buzzard Bedfordshire LU7 4TZ UK Tel 44 0 1525 217111 Fax 44 0 1525 378466 email enquiries studiomaster com www studiomaster com In Accordance with our progressive product development Studiomaster Recording Studio Design reserve the right to change features and specifications without prior notice AXM ENG V3
12. Othuvmaater TT by 0 A 2 47500 2500 3500 ower Amp USER GUIDE STUDIOMASTER AX Amplifier Series Contents Instructions Unpacking Safety Instructions Front panel controls and features Rear panel controls and features Operation Ventilation Protect LEDs Cables Rack Mounting Trouble Shooting Service Information Technical Information Technical Specification Glossary of Terms Set up Diagrams Mono Mix Stereo Mix Mono Bi amp Stereo Bi amp 2 way Monitor Mix Stereo Bi amp with Mono sub bass 2 way stereo with additional amplifiers Notes CONNNDDDWN 9 10 11 12 12 13 13 14 15 16 STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Congratulations on your purchase of a Studiomaster AX Series power amplifier Like all Studiomaster products it has been designed to meet the highest standards of performance safety and reliability We are confident that this amplifier will fully meet your needs for many years to come Please read this guide carefully and keep it safe in case you need to refer to it in the future Unpacking Remove your AX amplifier from its packing Check that the carton includes an AC power cord mains lead and a warranty card It is important to retain the carton and all packing material in the event that the unit needs to be returned to your dealer for service or repair Please complete and return your warranty card
13. Returning the completed warranty card does not diminish your statutory rights in any way Safety instructions 1 Make sure you have the correct product for your local supply Voltage This will be marked on the rear panel of the amplifier 2 Only use the A C power cord mains lead supplied with the product If it becomes damaged in any way it should be replaced 3 Never operate without or remove the safety ground earth from the power cord mains lead 4 Do not attempt to remove screws or panels There are no user serviceable parts inside 5 Do not operate the unit next heat sources such as electric fires central heating etc Note Exposure to strong sunlight eg outdoors could cause the amplifier to over heat 6 The unit should not be operated or stored near rain or moisture 7 This equipment must not be exposed to dripping splashing and no objects filled with liquids should be placed on top of it 8 Always ensure that both front and rear ventilation holes are clear of obstructions 9 Write the serial number in the box provided below for future reference 10 If the unit gets damaged or appears to have developed a fault refer to the Service Information section for details WARNING THIS APPARATUS MUST BE EARTHED GROUNDED STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Front panel controls and features 1 LEVEL controls adjust signal levels for channels A and B 2 ot
14. ase signal SLEEVE Ground SLEEVE Ground 2 Input GND LIFT ground lift switch removes the ground connection to all input connectors This can solve hum loop problems when connecting equipment with different A C supplies Under no circumstances should the electrical safety ground earth from the A C supply be disconnected 3 PARALLEL INPUTS links Channel A input to Channel B A single input signal will now supply both channels The volume levels of each channel can still be adjusted individually 4 35Hz high pass filter reduces the level of very low frequency signals reaching the speakers improving bass clarity and power handling It is recommended that this filter is always used for live P A Sound re inforcement Ported Vented bass reflex speaker cabinets can be damaged if driven with high power low frequency For Studio monitoring where a totally flat response is required deselect the High Pass Filter The filter has an 18dB octave cut off slope STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Rear panel controls and features RSD ii NOT OPEN LIMITER OFF disables the clip limiter circuit At maximum power output the limiter virtually prevents amplifier clipping minimising audible distortion It should only be turned off in specific applications as serious speaker damage can occur if the amplifier is allowed to clip regularly 6 X OVER turns on the
15. atus LEDS indicate the following a SIG indicates a signal is present and sound should be heard from the speakers b 6 shows a strong signal is present C PEAK shows maximum output power has been reached Increasing the level control or input signal will not increase the output power d PROTECT illuminates when the amplifier is muted at switch on After a couple of seconds they will turn off and the speakers are connected for normal operation If at any stage they stay illuminated a fault has occurred See section under PROTECT LEDs for more information e POWER shows the amplifier is switched on f BRIDGE indicates the amplifier is in BRIDGE mode 3 POWER switch 4 Fan ventilation holes Do not obstruct STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Rear panel controls and features 1 There are two INPUT CONNECTORS per channel One is a combination 3 pin XLR and pole TRS 4 jack socket the other a male XLR for linking to other amplifiers Both balanced and unbalanced signals can be used to drive the amplifier XLR connector wiring Balanced Operation Unbalanced operation PIN 1 Ground PIN 1 Ground PIN 2 Ve in phase signal PIN 2 Ve in phase signal PIN 3 Ve out phase signal PIN 3 Link to ground pin1 Jack connector wiring Balanced Operation Unbalanced operation pole TRS stereo jack 2 pole TS mono 4 jack Ve in phase signal TIP Ve in phase signal RING Ve out ph
16. e or both channels the relevent PROTECT LED s will stay illuminated and there will be no output The amplifier should be returned to an authorised Studiomaster service centre in the original packing to prevent shipping damage See Service Information STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Cables Speaker cables should be as short and as heavy gauge as possible to prevent unwanted power loss caused by high resistance which can result in loss of both signal level and quality Heavy duty twin core A C power cable is generally suitable Cable with a conductor size of 1 5mm 16AWG 2 5mm 14AWG or 4 0mm 12AWG is recommended Note the losses caused by using thinner cable Cable length Wire size Loss 8 ohms Loss 4 ohms Loss 2 ohms 5 metres 1 0mm 17AWG 2 1596 4 1 7 15 10 metres 1 0mm 17AWG 4 12 7 15 14 Rack Mounting The AX series amplifiers are designed to be fitted into a standard 19 rack They each occupy 2 Units 2U of rack space If the amplifier is to be used in a mobile application a good quality flight cased amp rack is essential if damage is to be prevented We recommend the use of 6mm rack screws with plastic or nylon washers underneath the screw heads to avoid damaging the front panel Always use both the front and rear mounting holes especially for mobile and touring applications Trouble Shooting No power on LED 1 Check A C power cord mains lead is connected to
17. internal two way crossover circuit The crossover splits the audio band into high frequencies suitable for mid high speakers and low frequencies suitable for bass speakers If the crossover function is not required this switch should remain off out position 7 The frequency switch selects the crossover frequency between 150Hz and 100Hz For most systems 150Hz is recommended although some typically when using 18 subs will work better with 100Hz The internal crossover has 3rd order response 8 HI LO selects which signal from the crossover the amplifier receives When HI out position is selected only frequencies above 100 or 150Hz feed the amplifier When LO in position is selected only frequencies below 100 or 150Hz feed the amplifier 9 XOVER OUTPUT sockets allow the high low frequencies from the crossover circuit to feed additional amplifiers See examples in the Set Ups section 10 BRIDGE mode combines the output power of both amplifier channels into one load This is useful when driving a single high powered speaker Only channel A output socket connects to the speaker but has to be wired in a different way see the section below regarding speaker wiring In this mode only Channel A input and level control are used STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Rear panel controls and features CAUTION S by RSD OF ELECTRIC SHOCK N DO NOT OPEN HI L y
18. phone jack in USA Used for balanced line signals insert Send return points and some stereo headphones Tip Sleeve 1 4 two pole jack plug Often referred to as a mono jack phone jack in USA Used for unbalanced signals Two wire connection using one signal and one screen conductor An industry standard connector used for audio signals usually 3 pin They are used for low level signals like microphones and line level signals as on the inputs of AX series amplifiers STUDIOMASTER AX Amplifier Series Mono Mix 1o 100 5 e n e e e e CL MT COO e 60066620 OMM 6 6 6 6 6 6 6 6 0 CSE CUM 6 0 Cie 6606661 e e e Parallel Switch IN HI XOVER 30Hz TO AMP OFF LIMITER XOVER OUTPUT ON L LO PARALLEL a BRIDGE PIN1 INPUTS m 150Hz PIN2 XOVER H 56 8 B INPUT A e On LIMITER XOVER OUTPUT ON OFF 2 LHI LO INPUT B e unk PIN 1 Left Right e D e e e e e CDM COO CDM e I Ed 000000000000 o quu 000000000000 o e 6 0 5 6
19. rvice Information section A C power inlet Fan ventilation holes Do not obstruct STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Operation Decide the required mode for the amplifier and select the appropriate rear panel switches The set up diagrams later in this guide will help Always ensure that all signal and power connections to the amplifier are properly made before switching on It is recommended to turn the level controls to minimum initially as well Any amplifier s in a system should always be switched on LAST and switched off FIRST to prevent damaging thumps originating from other equipment Hints and tips 1 Make sure that the speakers being used have the correct power rating for the amplifier This will help avoid possible damage to the speakers 2 The optimal speaker load impedance for power delivery and long term operation is 4 ohms per channel 8 ohms in bridged mode The amplifier will operate into 2 ohm loads 4 ohms bridged although continuous flashing of the PEAK LED should be avoided to prevent thermal protection shutting down the amplifier 3 Always use the LIMITER rear panel switch in the out position as it helps prevent distortion on large signal peaks 4 Use the 35Hz filter rear panel switch in position as it will improve the bass power handling and clarity of the system This is especially important with vented ported bass reflex cabinets 5 When used with
20. s developed a fault you should first carefully check the Trouble Shooting section in this guide If this does not solve the problem or if the product is physically damaged contact your local dealer or distributor for service details Should it be recommended you return the product to your nearest Studiomaster Service Centre you must first contact them You will be asked for the product type and serial number You will then be given a Returns Authorisation RA number Pack the unit in its original carton to protect it from shipping damage You must have the Returns Authorisation number clearly marked on the outside of the carton or we may refuse the delivery Studiomaster cannot be held responsible for damage resulting from the equipment being packed incorrectly Label the equipment clearly with your name and address and include a clear description of the fault The more information you supply helps the service engineer minimising repair cost when out of warranty Please write your Serial number here for future reference STUDIOMASTER AX Amplifier Series STUDIOMASTER AX Amplifier Series Technical Specification AX1500 AX2500 AX3500 Power Output in watts per channel At onset of Clipping Both Channels 8 ohms 270 450 710 Both Channels 4 ohms 450 750 1100 Both Channels 2 ohms 575 990 1450 Bridged 8 ohms 900 1500 2200 Bridged 4 ohms 1150 1980 2900 Input Sensitivity Ref Rated Power 4 ohms OdBu OdBu OdBu 0 775V 0 775V 0 77
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