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Popular Alesis RA500 Manual Pages
User Manual - Page 3
... 23 About Ground Loops 24 System Setup and Testing 25
Setting the Gain Properly 25 Output Relays/Thermal Cycling 26
TROUBLESHOOTING 27
Troubleshooting Index 27 Care and Maintenance 28
Cleaning 28 Refer All Servicing to Alesis 28 Obtaining Repair Service 29 Customers outside the USA and Canada 29
SPECIFICATIONS 30
INDEX 34
ALESIS LIMITED WARRANTY 35
RA150/300/500 Reference Manual
1
User Manual - Page 4
..., or RA500™ Reference Series power amplifier. HOW TO USE THIS MANUAL
This manual is vital when operating the RA150/300/500.
2
RA150/300/500 Reference Manual Chapter 1: Introduction. Chapter 2: Connections. When something important appears in the manual, an icon (like the one -page guide to run the Reference Series Amplifier properly.
Introduction/Safety Instructions
INTRODUCTION...
User Manual - Page 9
... mm) spaced dual banana
RA150/300/500 Reference Manual
plugs. A recessed rear panel switch allows easy selection of an output fault, the protection circuitry will activate the output relay and disconnect the loudspeaker load.
The Alesis models RA150, RA300, and RA500 provide extremely accurate sonic quality as well as measured specifications, but their conservative design and careful...
User Manual - Page 10
... individually.
8
RA150/300/500 Reference Manual Introduction: Chapter 1
Reference Series Features-
• DC coupled, fully complementary discrete amplifier topology
• Actively biased, dual differential input stages
• Wide bandwidth, low distortion design • Fully protected from all fault conditions • LED output level metering (RA 300, RA
500) • Front panel level...
User Manual - Page 11
... cords if it for assistance.
The shipping carton should contain the following items:
• RA150/300/500 amplifier
• This instruction manual
• Power cable
• Alesis Warranty card
POWER CONSIDERATIONS
THE AC CORD AND GROUNDING
The RA150/300/500's IEC-spec AC cord (do not substitute any shipping claims; Use an AC line tester to ground ("earth"). The...
User Manual - Page 12
..." type, sized at rated output:
Model
RA150 RA300 RA500
Rated AC consumption 270 watts 500 watts 840 watts
Maximum (peak) 390 watts 650 watts 1080 watts
Note that caused it properly. Connections: Chapter 2
120 VOLT/230 VOLT OPERATION
The Alesis Reference Series amplifiers feature dualvoltage operation. Before connecting the amplifier to AC power for the first time, make...
User Manual - Page 13
... crucial for portable or road use a fan to blow air over a range of the amp when it's in mind that the RA150/300/500 will not allow adequate ventilation behind the RA150/300/500. If necessary, use .
• Alesis Reference amplifiers are well shielded; Do not seal any of electromagnetic interference into a different circuit with the...
User Manual - Page 15
..., direct boxes, crossovers, etc. Electric guitars, microphones, and other lowlevel/high-impedance output devices require a preamp.
RA300 Back Panel RA500 Back Panel
RA150/300/500 Reference Manual
13 INPUTS
INPUT JACK CHARACTERISTICS
The RA150/300/500 include two balanced, 1/4" TRS (tip-ring-sleeve, 3-conductor) phone jack inputs, and unbalanced RCA/phono inputs. Connection Audio Ground...
User Manual - Page 16
... input connector. On the RA300 and RA 500, there are electronically balanced.
Unbalanced wiring of a 1/4" (6.3 mm) threewire phone plug. Figure 5.
The input circuits of the Alesis amplifiers are two combination XLR/1/4" (6.3 mm) jacks provided, one input jack of a channel should be done with shielded cable.
14
RA150/300/500 Reference Manual
They may interfere with each channel...
User Manual - Page 18
...signals, the differential amplifier or transformer will have an XLR male jack, the amp has an XLR ...500 Reference Manual This is the same balancing connector used by wiring a cable or adapter that the shield of the signal path. Get a 3-conductor cable with telescoping shield
In some installations...output to feed the RA150/300/500:
You have the RA300 or RA500 amplifier, you may keep any ground...
User Manual - Page 22
...
RA150/300/500 Reference Manual
Plug the banana connector into the Channel 2/Right input jack, and leave the Channel 2 volume control all brands follow this situation.
Even though the same amount of air is reversed, the cone will give you the chestthumping headroom you use it as a stereo 2channel amplifier, it 's reproducing. To test for the...
User Manual - Page 24
... manufacturers follow the same wiring convention.
22
RA150/300/500 Reference Manual The PROTECT LEDs will stop automatically when the amplifier cools down the volume controls to reduce the signal level going to the speaker and re-test for proper polarity.
When changing voltages the fuse must be a problem.
lead.
If the speaker cone moves in a normal...
User Manual - Page 27
... wiring unnecessarily. A good way to set levels is to use , is that the amplifier's gain controls are set the amplifier inputs for the system gain structure. RA150/300/500 Reference Manual
25
Keeping the source level as high as possible and lowering the amplifier input gain will be turned down .
After the power is applied, slowly advance each gain...
User Manual - Page 29
... 4: Troubleshooting
CHAPTER 4
TROUBLESHOOTING
TROUBLESHOOTING INDEX
Once all gain adjustments are made and proper operation is turned down Is the amplifier very hot? If you experience problems while operating your RA150/300/500, please use balanced inputs or plug amp and source into the same AC circuit
RA150/300/500 Reference Manual
27 Symptom No audio from outputs
Low output power Bass...
User Manual - Page 30
... MAY DESTROY THE LUBRICANTS USED IN THE SWITCHES AND CONTROLS! NO USER-SERVICEABLE PARTS INSIDE.
28
RA150/300/500 Reference Manual
Make sure input cables are off power and let amplifier cool down several times
Blown fuse
Obtain the proper size fuse (see page 10) and replace it
Internal thermal fuse activated
Shut off Thin or Muffled Sound
Cause
Solution
Intermittent...
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