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 21

EQ Section 

1. Graphic EQ: 
30, 40, 60, 100, 180, 340, 660, 1.3K, 2.6K, 5K, 10K, 15KHz at +/- 18dB Q Factor 0.7 
2. Parametric EQ: 
30-200Hz, 300-2KHz, 3KHz-15KHz at +/-15dB Q Factor Nominal 0.7 
 

FAN   

2 speeds. Slow: 12V continuous. Fast: 24V on at 60º C Heat sink Temp. 
 

Protection Circuits 

1. AC line filter. 
2. Slow-blow Fuse: 10 amp 
3. AC Transformer: auto cut off at 105ºC, Auto reset at 60º C. 
4. Transistor Current Drain: auto cut off at 9 amps. (Manual reset on back panel.) 
5. Transistor Thermal Protection: auto cut off at 90º C. 
6. Loudspeaker Short-Circuit Protection. 
7. DC Output Protection. 
8. Turn on protection: 2-second delay. 
 
 
 
 
 
 

 
Frequency Curve Inputs: Passive (upper trace) & Active (lower trace) 

 

 

 

 

Содержание M-500

Страница 1: ...M 500 BASS INSTRUMENT AMPLIFIER OWNER S MANUAL ...

Страница 2: ... 4 Front Back Panel Overview Page 5 Front Back Panel Description Page 6 Getting Started Page 11 Power Graph Page 15 Matching Speakers Page 16 Amplifier and Speaker Power Page 17 Routine Care Maintainance Page 18 Service Information Page 18 Warranty information Page 19 Specifications Page 20 ...

Страница 3: ...se its ventilation system Never block the air intake or fan output Do not locate this amplifier near any heat source This amplifier must be connected only to a power source specified in this manual For safety do not leave the amplifier plugged into a power source for long periods of time when not in use Do not let any liquid or foreign objects fall into any openings on the amplifier Never use this...

Страница 4: ...olar devices used in other bass amplifiers Typical bipolar devices will blow faster than a fuse can save them TECHNICAL NOTE The reason lateral M OS F E T s are more rugged is that they have a positive temperature coefficient like bi polar transistors but as soon as the MOSFET drain current becomes significant they take on a negative temperature coefficient That protects the circuit from damage MO...

Страница 5: ...nternal temperature 90 C the amplifier will turn off to protect the output transistors 5 Short Circuit Protection If you have a faulty speaker or faulty speaker connections the amplifier will shut down Switch power off and press reset button on back panel 6 DC Output Protection The M 500 is a DC coupled design that offers the best performance If a fault occurs internally in the amplifier it will s...

Страница 6: ...D LIFT GROUND M 500 000001 30 32 34 35 36 37 38 39 33 31 29 40 36 35 HEADPHONE 1 3kHz 6 5 11 3 2 COMPRESSION LINE IN 0 MAX 12 18 6 ACTIVE LIMITER BASS 12 0 6 18 30Hz 60Hz 40Hz 340Hz 180Hz 100Hz 660Hz 22 28 25 VOLUME PEDAL 6 18 12 FX RETURN 12 6 0 18 5kHz 2 6kHz 15kHz 10kHz 26 FX SEND ON OUTPUT OFF 15dB 1 17 16 15 14 9 10 8 7 4 OFF ON 0 25 dB PASSIVE 4 IN 30 15dB 200 300 15dB 15dB 2K LEVEL GRAPHIC ...

Страница 7: ... the limiter threshold The compression ratio is 3dB to 1 Adjust this to suit your playing style and output power of instrument 6 LIMITER INDICATOR This L E D Light Emitting Diode will light up when the signal is being compressed This will vary on how hard the instrument is played and how the threshold is adjusted 7 INPUT LEVEL SENSITIVTY CONTROL Just as no two basses are alike the same goes for pl...

Страница 8: ...OL 3KHz 15KHz PARAMETRIC Adjusts level 15dB of selected frequency A Note on the Parametric EQ Some instrument amplifiers have a pre set EQ which may have a selected feature of bypassing it or modifying it to another factory selected pre set The PJB parametric is designed to give the player the exact amount of pre EQ required without the confines of a pre set It is infinitely adjustable so your ton...

Страница 9: ...ny type of headphones 24 FX SEND OUTPUT JACK This jack sends the signal to an effects processing unit It can also be used to send the signal to a tuner 25 FX RETURN INPUT JACK This jack accepts the signal from an effects processing unit Plugging this jack in only will disrupt the signal path in the M 500 26 POWER ON OFF SWITCH This switches the main power on and off in the amplifier When the M 500...

Страница 10: ...e maximum load for this amplifier The Speakon sockets are in parallel so connecting two 8Ω speakers will result in a 4Ω total load We recommend that you use PJB high current speaker cables which are dedicated high current low resistance cables Using inferior cables will greatly impair the performance of your system 36 PRE AMPLIFIER OUTPUT JACKS These are used for driving a second amplifier such as...

Страница 11: ...cted to a sound reinforcement or recording console through the DI output socket 40 AMPLIFIER COOLING FAN OUTPUT The M 500 has a dual speed fan that will change speed automatically in order to maintain a safe and reliable working temperature It is designed to be virtually inaudible during operation Never block the airflow output of this fan ...

Страница 12: ... it needs it is possible for the amplifier s thermal protection circuits to operate and turn off the amplifier The protection circuits work on temperature and current workings in the amplifier s output transistors and power supply AC power can vary from region to region and time of day due to electricity demand Also because the amplifier uses force air cooling the operating temperature of the ampl...

Страница 13: ...boosting low frequencies excessively if you have a small speaker system The same goes for adjusting how much treble you like by using controls 16 17 The frequency control 16 has a very wide frequency coverage to cover all kinds of basses including ones with peizo and lightwave pickups and you will find that on some basses with magnetic pickups the upper end of this range is beyond the output of yo...

Страница 14: ... bass players low frequencies are always very difficult to control with room acoustics The reproduced wavelengths of the notes you are playing often correspond to the room dimensions in which case the reflected sound off the walls interferes with the sound from the speaker So the graphic EQ is by far your best weapon of choice in killing standing waves that develop in the room From about 250Hz upw...

Страница 15: ...ly clockwise Now switch on the limiter 4 Start playing and turn control 14 anti clockwise You will see the red light start to come on and that is the indication that the limiter is now working Set this control to suit your taste The M 500 has an extremely powerful EQ system Take great care when turning up the master volume control 20 On the front panel there is a power level indicator 21 The red l...

Страница 16: ...IVERED 6T 12Ω 190 WATTS 9B 8Ω 280 WATTS 8T 16 Ω 160 WATTS 16B 8 Ω 280 WATTS 16H 8 Ω 280 WATTS 24B 5 3 Ω 400 WATTS 6T 9B 4 8Ω 430 WATTS 6T 12B 4Ω 480 WATTS 2 X 9B 4Ω 480 WATTS 8T 16B 5 3Ω 400 WATTS 8T 24B 4Ω 480 WATTS 2 X 16B 4Ω 480 WATTS 2 X 16B 8T 3 2Ω 550 WATTS 2X24B 2 7 Ω 600 WATTS 2 X 24B 2 X 8T 2Ω 720 WATTS ...

Страница 17: ...ing how much power is going to a loudspeaker Secondly loudspeakers have different power ratings at each and every frequency The amplifier will produce different power levels if the frequency changes even if the volume is the same Finally we hear sound based on a logarithmic scale So in order to perceive a note twice as loud in theory we need 10 times the power to produce the perceived doubling of ...

Страница 18: ...s internal power supply the type quantity of transistors that are used in the output stage along with solid construction will have a major effect on manufacturing cost A cheap amplifier may be designed to last a few years before it dies It may cost more than its worth to give it an overhaul In essence you get what you pay for Your M 500 is built to last for a very long time running day after day a...

Страница 19: ...tion The M 500 has a warranty period of 2 years starting from the date of purchase The buyer must complete and return the enclosed warranty card within 14 days of purchase This warranty covers defect in materials or workmanship that occurs in normal use Within warranty period PJB will repair or replace the defect unit free of labor and parts charge It is the buyer s responsibility to use the ampli...

Страница 20: ... may return the defect unit to PJB service center for repair or replacement Phil Jones Bass 8559 Page Ave St Louis MO 63114 USA Tel 314 814 1264 Fax 314 628 9941 www philjonesbass com support philjonesbass com Serial Number Date Purchased Dealer ...

Страница 21: ... 80 dB EQ off Input Gain on Full Volume on Full Impedance Passive Input 2MΩ 22pF Active Input 100KΩ 22pF Line Input 75KΩ FX Return 75KΩ FX Send 4 7KΩ Pre Amp Out 2KΩ Bal Line Out 200Ω Levels Passive Input 10mV 2 5V Active Input 20mV 5V Line Input 0 5 2V FX Return Typical 100mV FX Send Typical 100mV Pre Amp Out 1 2V Bal Line Out Typical 100mV LED Input Meter Passive Input Blue 10mV Green 150mV Red ...

Страница 22: ...Heat sink Temp Protection Circuits 1 AC line filter 2 Slow blow Fuse 10 amp 3 AC Transformer auto cut off at 105ºC Auto reset at 60º C 4 Transistor Current Drain auto cut off at 9 amps Manual reset on back panel 5 Transistor Thermal Protection auto cut off at 90º C 6 Loudspeaker Short Circuit Protection 7 DC Output Protection 8 Turn on protection 2 second delay Frequency Curve Inputs Passive upper...

Страница 23: ...22 Frequency Curve Line Input Graphic EQ ...

Страница 24: ...23 Amplifier Output Power Impedance Amplifier Output Voltage Impedance ...

Страница 25: ...24 ...

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