User Manual
Page 3
...20 OPERATION 21 Front Panel Controls 21 Volume Controls 21 On-Off Switch 21 Mute Switch 21 Protect/Clip Indicators 22 Meters (RA300 and RA500 only 22 Back Panel Controls 22 AC Voltage Switch 22 Stereo/Bridged Mono Switch 22 Checking For Proper Polarity 22 Using the RA150 as... a Headphone Amplifier.......23 Choosing the Correct Speakers 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 ...
...20 OPERATION 21 Front Panel Controls 21 Volume Controls 21 On-Off Switch 21 Mute Switch 21 Protect/Clip Indicators 22 Meters (RA300 and RA500 only 22 Back Panel Controls 22 AC Voltage Switch 22 Stereo/Bridged Mono Switch 22 Checking For Proper Polarity 22 Using the RA150 as... a Headphone Amplifier.......23 Choosing the Correct Speakers 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 ...
User Manual
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Introduction/Safety Instructions CE DECLARATION OF CONFORMITY Manufacturer's Name: Manufacturer's Address: declares, that the product: Product Name: Model Type: Alesis Corporation 1633 26th Street Santa Monica, CA 90404 USA RA150/300/500 Audio amplifier conforms to the following Standards: Safety: EN60065 EMC: EN55103:1997 Class B (all tests were performed with fully- Phone: +44.1462.480000 Fax: +44.1462.480800 October 2000 6 RA150/300/500 Reference Manual shielded cabling.) European Contact: Sound Technology 17 Letchworth Point, Letchworth, Hertfordshire, SG6 1ND, England.
Introduction/Safety Instructions CE DECLARATION OF CONFORMITY Manufacturer's Name: Manufacturer's Address: declares, that the product: Product Name: Model Type: Alesis Corporation 1633 26th Street Santa Monica, CA 90404 USA RA150/300/500 Audio amplifier conforms to the following Standards: Safety: EN60065 EMC: EN55103:1997 Class B (all tests were performed with fully- Phone: +44.1462.480000 Fax: +44.1462.480800 October 2000 6 RA150/300/500 Reference Manual shielded cabling.) European Contact: Sound Technology 17 Letchworth Point, Letchworth, Hertfordshire, SG6 1ND, England.
User Manual
Page 22
... as mixers or effects units) "upstream" of air is possible to speaker cone motion will give you the chestthumping headroom you use it 's reproducing. To test for the Channel 1/Left and the "-" wire to BRIDGED MONO. To connect a speaker in devices (such as opposed to the speaker's positive (+) terminal. The single...
... as mixers or effects units) "upstream" of air is possible to speaker cone motion will give you the chestthumping headroom you use it 's reproducing. To test for the Channel 1/Left and the "-" wire to BRIDGED MONO. To connect a speaker in devices (such as opposed to the speaker's positive (+) terminal. The single...
User Manual
Page 24
...country the amplifier will be used in. The PROTECT LEDs will light in the opposite direction, reverse the wires going to the speaker and re-test for any distortion even if the indicator flashes. Make sure this switch only if it . If this doesn't solve the problem, check your ... will stop automatically when the amplifier cools down the volume controls to reduce the signal level going to the RA150/300/500. METERS (RA300 AND RA500 ONLY) In the center of actual clipping. In general, a few microseconds, a pulse-stretching circuit will move forward (toward you) when you may not...
...country the amplifier will be used in. The PROTECT LEDs will light in the opposite direction, reverse the wires going to the speaker and re-test for any distortion even if the indicator flashes. Make sure this switch only if it . If this doesn't solve the problem, check your ... will stop automatically when the amplifier cools down the volume controls to reduce the signal level going to the RA150/300/500. METERS (RA300 AND RA500 ONLY) In the center of actual clipping. In general, a few microseconds, a pulse-stretching circuit will move forward (toward you) when you may not...
User Manual
Page 27
... gain will be clipping its dynamic range without clipping itself. The input sensitivity of the difficulty. If the signal at nominal levels, increase the test tone until the desired peak sound pressure level is achieved. Most mixers output +4 dBu at a minimum. This can lead to avoid amplifier clipping...output is turned down to blown speakers if the mixer is accidentally turned up . RA150/300/500 Reference Manual 25 SYSTEM SETUP AND TESTING Before applying power for the first time, double check the wiring to insure that everything is firmly connected and that the proper signals are...
... gain will be clipping its dynamic range without clipping itself. The input sensitivity of the difficulty. If the signal at nominal levels, increase the test tone until the desired peak sound pressure level is achieved. Most mixers output +4 dBu at a minimum. This can lead to avoid amplifier clipping...output is turned down to blown speakers if the mixer is accidentally turned up . RA150/300/500 Reference Manual 25 SYSTEM SETUP AND TESTING Before applying power for the first time, double check the wiring to insure that everything is firmly connected and that the proper signals are...
User Manual
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..., 30 thermal protect mode, 27 transformer input, 17 transformers power, 7, 33 TRS jacks, 14, 16 turn-on delay, 21 unbalanced input, 14, 16 Unbalanced-to test, 22 power output, 30 Power cable, 3 power loss in speaker cable, 18 protection, 7 Rack Mounting, 11 RCA/phono input jacks. See Bridged Mono noise, 25...
..., 30 thermal protect mode, 27 transformer input, 17 transformers power, 7, 33 TRS jacks, 14, 16 turn-on delay, 21 unbalanced input, 14, 16 Unbalanced-to test, 22 power output, 30 Power cable, 3 power loss in speaker cable, 18 protection, 7 Rack Mounting, 11 RCA/phono input jacks. See Bridged Mono noise, 25...