Benchmark AHB2 Instruction Manual Download Page 4 | Manualshive

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Benchmark AHB2 Instruction Manual Download Page 4

AHB2

Instruction Manual Rev F

Page 4

Important Safety Instructions

Safety Symbols

This symbol alerts the user that there are important operating and maintenance

instructions in the literature accompanying this appliance.

This symbol alerts the user to the presence of uninsulated voltages within the unit that can

cause dangerous electric shocks.

This symbol alerts the user to the presence of voltages at the output connectors that can

cause dangerous electric shocks.

This symbol alerts the user that the product can only be used safely at altitudes lower than

2,000 meters.

This symbol alerts the user that the product can only be used safely in non-tropical

climates.

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Summary of Contents for AHB2

Page 1: ...Benchmark AHB2 Instruction Manual Reference Stereo Power Amplifier 100W channel into 8 Ohms 380W bridged mono into 8 Ohms...

Page 2: ...t Option 13 Rack Mounting Instructions 13 Fault Protection Circuitry 14 Fault Detection Circuits 14 PROTECT Mode Both MUTE Lights On 14 PROTECT Mode Fault Codes 15 Clipping Fault 16 Over Current Fault...

Page 3: ...roximately equivalent to the noise performance of a perfect 22 bit digital system Virtually Distortion Free A THX patented feed forward error correction system virtually eliminates all traces of disto...

Page 4: ...lerts the user to the presence of uninsulated voltages within the unit that can cause dangerous electric shocks This symbol alerts the user to the presence of voltages at the output connectors that ca...

Page 5: ...g 10 The speaker outputs are capable of producing dangerous voltages Use insulated speaker connections Unplug the apparatus before making changes to the speaker output connections Hazardous Internal V...

Page 6: ...atus is equipped with an auto ranging power supply There is no internal voltage selection switch do not attempt to open the unit Operating voltage ranges are 100 to 120 Vac 10 and 220 to 240 Vac 10 Op...

Page 7: ...Front Panel Front Panel Layout Left to Right Power Switch Power Indicator Channel 1 Clip Indicator Channel 1 Temperature Indicator Channel 1 Mute Indicator Channel 2 Mute Indicator Channel 2 Temperatu...

Page 8: ...ft to Right 12 Volt Trigger Input Output Connector 3 Position Sensitivity Switch Sets Gain Balanced XLR Input for Channel 2 NL4 Speaker Output for Channel 2 NL4 Speaker Output for Bridged Mono Operati...

Page 9: ...O if the AHB2 is driving a stereo pair of speakers Set this switch to STEREO if the AHB2 is driving two channels of a multi channel system Set this switch to STEREO if the AHB2 is driving a biamped tw...

Page 10: ...ow resistance and are designed to reliably carry high current These jacks are compatible with two pole NL2 plugs or four pole NL4 plugs For best performance make all speaker connections using twist lo...

Page 11: ...clip indicator Flash Clip Off Normal On Fault TEMP one per channel Over temperature indicator Off Normal On Fault MUTE one per channel Channel mute indicator Off Normal On PROTECT POWER Power Status...

Page 12: ...connectors The tip is wired to the 12V TRIGGER I O bus The sleeve is wired to chassis ground There is no connection to the ring Trigger Cables The AHB2 includes one 3 foot 1 m 12V TRIGGER CABLE This...

Page 13: ...nt heat when heavily loaded Make sure the rack is adequately ventilated Make sure the side heat sinks have an unobstructed air flow Some power amplifiers can emit very strong magnetic fields These amp...

Page 14: ...or on each output channel Load sensor on main power supply Fault sensors on all power supplies AC line under voltage fault sensor on AC input PROTECT Mode Both MUTE Lights On In PROTECT mode both MUTE...

Page 15: ...ON ON AC Startup lamp test ON OFF OFF ON ON OFF OFF Mute on startup or shutdown ON OFF OFF OFF OFF OFF OFF Normal operation no errors ON FLASH OFF OFF OFF OFF OFF Channel 1 clipping ON OFF OFF OFF OF...

Page 16: ...ifier has been driven very hard into voltage clipping Both channels are muted to protect the amplifier and speakers A power reset will be required Fault Display POWER light is Flashing One or both CLI...

Page 17: ...Check for shorted speaker cables Make sure the nominal Stereo load impedance is 3 Ohms or higher Make sure the nominal Bridged Mono load impedance is 6 Ohms or higher Turn down the audio source Resta...

Page 18: ...WER light is On Both CLIP lights are On Both TEMP lights are On Both MUTE lights are On Typical Causes The load impedance of the speakers may be too low Speaker cables may be shorted Amplifier has bee...

Page 19: ...t cools a power reset will be required Fault Display POWER light is Flashing Both CLIP lights are Off One TEMP light is On Both MUTE lights are On Typical Causes The load impedance of the speakers may...

Page 20: ...Both TEMP lights are On Both MUTE lights are On This fault display will only persist if AC is present In the event of a total loss of AC power this error display will stay on for about 15 30 seconds a...

Page 21: ...nnels driven 18 A protection shut down threshold Frequency Response Better than 0 1 Hz to 200 kHz 0 3 dB 0 01 dB at 20 Hz 0 17 dB at 20 kHz 8 Ohm Load 0 23 dB at 20 Hz 0 32 dB at 20 kHz 4 Ohm Load Sig...

Page 22: ...1 kHz typical 65 dB at 20 kHz typical Trigger I O 12 VDC 200 mA current limited output to trigger turn on of remote devices DC input for slaving to remote devices Input responds to 3 3 V logic and hi...

Page 23: ...AHB2 Instruction Manual Rev F Page 23 Mechanical Drawings Dimensions...

Page 24: ...AHB2 Instruction Manual Rev F Page 24 Rack Mount Dimensions...

Page 25: ...Power is shown on the right hand vertical scale The green trace is the THD measured at the output of the left channel when loaded with 4 Ohms The red trace is the THD measured at the output of the rig...

Page 26: ...Power 8 Ohm Load This plot shows the THD of the AHB2 with an 8 Ohm load Note that the results are almost identical to those shown in Figure 1 with a 4 Ohm load Together these two plots demonstrate th...

Page 27: ...ows that the THD produced by the AHB2 does not increase with loading The red trace is the no load THD performance in bridged mono mode The green trace is the THD performance while driving an 8 Ohm loa...

Page 28: ...Comment Cursor1 Cursor2 1 1 Red Solid 4 Anlr Ratio Left 350 4 X Y 254 1 X Y 0 400 50 100 150 200 250 300 350 350 4 254 1 X Y 10 200k 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 20 2 1k Hz dx 979800kHz...

Page 29: ...he performance at 320 W Both are nearly identical The 1 kHz fundamental has been removed with a notch filter to improve the resolution of the AP2722 test set The 2nd harmonic measures 131 5 dB relativ...

Page 30: ...radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception whic...

Page 31: ...AHB2 Instruction Manual Rev F Page 31 CE Certificate of Conformity...

Page 32: ...nt Stereo Audio Amplifier Model AHB2 Part Number 500 18000 xx0 Parameters Rated Input Voltage 100 120 Vac 220 240 Vac Rated Frequency 50 60 Hz Rated Input Current 8A Protection Class I Tested accordin...

Page 33: ...If the failure has been caused by misuse neglect accident or abnormal operating conditions repairs will be billed at the normal shop rate In such cases an estimate will be submitted before work is st...

Page 34: ...edia Systems Inc optionally extends the standard 1 year warranty to a period of two years from the date of delivery For the extended warranty to become effective the original purchaser must register t...

Page 35: ...r sence de tensions isol es l int rieur de l unit qui peuvent provoquer des chocs lectriques dangereux Ce symbole avertit l utilisateur de la pr sence de tensions sur les connecteurs de sortie qui peu...

Page 36: ...ies haut parleurs sont capables de produire des tensions dangereuses Utilisez des connexions de haut parleurs isol es D branchez l appareil avant de modifier les connexions de sortie de haut parleur 1...

Page 37: ...a pas de commutateur de s lection de tension interne ne tentez pas d ouvrir l appareil Les gammes de tension de fonctionnement vont de 100 120 Vac 10 et de 220 240 Vac 10 La fr quence de fonctionneme...

Page 38: ...amplifier actively drives the output while the main output devices are transitioning between push and pull states The correction amplifier actively suppresses distortion products that would normally...

Page 39: ...ing power supplies in all of its newer products Switching frequencies are set well above the audio band More importantly the high switching frequency greatly reduces the size of the magnetic component...

Page 40: ...they are polarized and fully insulated to protect against short circuits polarity reversals and shock hazards Benchmark recognizes that the Hi Fi industry is slow to embrace new ideas so we have provi...

Page 41: ...Rev F Page 41 Copyright 2014 Benchmark Media Systems Inc All rights reserved Benchmark Media Systems Inc 203 East Hampton Place STE 2 Syracuse NY 13206 1633 USA PHONE 1 315 437 6300 FAX 1 315 437 8119...

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