User Manual
Page 3
... of Conformity 6 ABOUT THE RA150/300/500 7 Principal Features 7 The Chassis 7 Inputs and Outputs 7 Amplifier topology 7 Protection Circuitry 7 About this manual 8 CONNECTIONS 9 Unpacking and Inspection 9 Power Considerations 9 The AC Cord ... 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 ... 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 ...
... of Conformity 6 ABOUT THE RA150/300/500 7 Principal Features 7 The Chassis 7 Inputs and Outputs 7 Amplifier topology 7 Protection Circuitry 7 About this manual 8 CONNECTIONS 9 Unpacking and Inspection 9 Power Considerations 9 The AC Cord ... 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 ... 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 ...
User Manual
Page 9
... IEC connector cable. In the event of stereo or bridged monaural operating modes. The Alesis models RA150, RA300, and RA500 provide extremely accurate sonic quality as well as measured specifications, but their conservative design and careful attention to electronic protection means they will also mute the amplifier during power on maintaining wide bandwidth, linearity and...
... IEC connector cable. In the event of stereo or bridged monaural operating modes. The Alesis models RA150, RA300, and RA500 provide extremely accurate sonic quality as well as measured specifications, but their conservative design and careful attention to electronic protection means they will also mute the amplifier during power on maintaining wide bandwidth, linearity and...
User Manual
Page 20
... cables for permanent installations. Connections: Chapter 2 OUTPUTS Warning: Be sure that the AC power is off their outputs until the low load condition is removed. The RA150/300/500 amplifiers will not be taken that produces 1 dB of installation. However, solid cables are also... are equally usable. If you use shielded guitar cords as speaker cables. The lower the resistance, the better. Alesis amplifiers can reliably drive 4 Ω loads in Stereo mode and 8 Ω loads in Bridged Mono mode. Some loudspeakers carry both nominal and minimum impedance specifications, ...
... cables for permanent installations. Connections: Chapter 2 OUTPUTS Warning: Be sure that the AC power is off their outputs until the low load condition is removed. The RA150/300/500 amplifiers will not be taken that produces 1 dB of installation. However, solid cables are also... are equally usable. If you use shielded guitar cords as speaker cables. The lower the resistance, the better. Alesis amplifiers can reliably drive 4 Ω loads in Stereo mode and 8 Ω loads in Bridged Mono mode. Some loudspeakers carry both nominal and minimum impedance specifications, ...
User Manual
Page 22
.... But if you use a dual banana plug in devices (such as mixers or effects units) "upstream" of using the RA150/300/500 as a stereo 2channel amplifier, it is moved in either case, many listeners report superior sound with proper polarity as a subwoofer) in bridged mono mode:...all the way down. OUTPUT CONNECTIONS FOR BRIDGED OPERATION Instead of the RA150/300/500. Connections: Chapter 2 THE IMPORTANCE OF SPEAKER POLARITY The speaker cone's motion should mimic the instrument it as a mono amplifier with twice the power. Usually, for binding post or crimp-on Channel 2/Right. Please ...
.... But if you use a dual banana plug in devices (such as mixers or effects units) "upstream" of using the RA150/300/500 as a stereo 2channel amplifier, it is moved in either case, many listeners report superior sound with proper polarity as a subwoofer) in bridged mono mode:...all the way down. OUTPUT CONNECTIONS FOR BRIDGED OPERATION Instead of the RA150/300/500. Connections: Chapter 2 THE IMPORTANCE OF SPEAKER POLARITY The speaker cone's motion should mimic the instrument it as a mono amplifier with twice the power. Usually, for binding post or crimp-on Channel 2/Right. Please ...
User Manual
Page 24
...Underneath the right input jack, this switch is accidentally switched to Mono while wired for you will allow the LED to light long enough for stereo, you to see that a problem is set to the wrong value for your application. Even if the problem occurs for only a few... microseconds, a pulse-stretching circuit will hear out-of-phase audio as a single-channel amplifier with approximately twice the power. The highest (red) LED indicates the unit is 6 dB below maximum rated output. Because of the RA150/300/500's ability to enter and exit clipping with the PROTECT LED on page 10...
...Underneath the right input jack, this switch is accidentally switched to Mono while wired for you will allow the LED to light long enough for stereo, you to see that a problem is set to the wrong value for your application. Even if the problem occurs for only a few... microseconds, a pulse-stretching circuit will hear out-of-phase audio as a single-channel amplifier with approximately twice the power. The highest (red) LED indicates the unit is 6 dB below maximum rated output. Because of the RA150/300/500's ability to enter and exit clipping with the PROTECT LED on page 10...
User Manual
Page 29
...LEDs on the back panel to the "stereo" position Make sure that the RA150/300/500 and its internal temperature has dropped to "12:00" or above Normal operation will resume when its audio cables are required for Alesis Reference Series amplifiers. Set levels to reliable levels. Set ... maintenance operations necessary (or available). Symptom No audio from outputs Low output power Bass disappears, speakers sound out of unbalanced Replace the cable with the source Noise induced from power cables, other power transformers and wall warts. Use balanced inputs instead of phase Buzz from the...
...LEDs on the back panel to the "stereo" position Make sure that the RA150/300/500 and its internal temperature has dropped to "12:00" or above Normal operation will resume when its audio cables are required for Alesis Reference Series amplifiers. Set levels to reliable levels. Set ... maintenance operations necessary (or available). Symptom No audio from outputs Low output power Bass disappears, speakers sound out of unbalanced Replace the cable with the source Noise induced from power cables, other power transformers and wall warts. Use balanced inputs instead of phase Buzz from the...
User Manual
Page 35
...A power switch shall be provided on the back panel shall allow the user to automatically null DC output voltage offsets. The units shall be capable of 150 watts (RA150), 300 watts (RA300), or 500 watts (RA500) into a 4-ohm load, with 2 ohm dynamic stability (stereo mode... stage for excessive DC offset, short circuits and thermal overload. RA150/300/500 Reference Manual Specifications The chassis shall be an Alesis RA150/300/500 Reference Series power amplifier. 33 Architect's and Engineer's Specifications The power amplifier shall be a two-channel unit capable of being switched to ...
...A power switch shall be provided on the back panel shall allow the user to automatically null DC output voltage offsets. The units shall be capable of 150 watts (RA150), 300 watts (RA300), or 500 watts (RA500) into a 4-ohm load, with 2 ohm dynamic stability (stereo mode... stage for excessive DC offset, short circuits and thermal overload. RA150/300/500 Reference Manual Specifications The chassis shall be an Alesis RA150/300/500 Reference Series power amplifier. 33 Architect's and Engineer's Specifications The power amplifier shall be a two-channel unit capable of being switched to ...