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AHB2

 Instruction Manual                  Rev F                        

Page 3 

Introduction 

Thank you for purchasing the Benchmark 

AHB2

 audio power amplifier. To take full advantage of 

the extraordinary performance of this amplifier, and to enjoy long and trouble-free use, please read 

this manual carefully. 

Product Overview 

True HRA Performance 

The 

AHB2

 is a reference-grade audio power amplifier that is specifically designed to complement 

the performance delivered by the finest High Resolution Audio (HRA) recording and playback 

systems. The SNR and THD performance of the 

AHB2

 put this amplifier in a class by itself. 

Virtually Noise Free 

The 

AHB2

 delivers a SNR that exceeds 132 dB A-weighted. This makes the 

AHB2

 15 to 30 dB 

quieter than most top-quality power amplifiers. 132 dB is approximately 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 distortion at 
all signal level and loading conditions. The 

AHB2

 shows no traces of the crossover distortion that 

can occur when push-pull outputs stages switch between output devices. Without crossover 
distortion, low-level details are resolved with precision. At high output levels, the 

AHB2

 remains 

virtually distortion free while driving heavy loads. 

Patent Information 

The 

AHB2

 incorporates patented 

THX® Achromatic™ Audio Amplifier Technology (THX 

AAA™

) which is licensed from THX Limited. 

Licensed THX Patents 

 

U.S. Patent No. 8,004,355  

 

U.S. Patent No. 8,421,531  

 

Mexico Pat. No. 312399  

 

Mexico Pat. No. 317696  

 

Canada Pat. No. 2753575  

 

S. Korea Pat. No. 10-1429804 

 

Additional Patents Pending 

A complete list of applicable patents is available at: 

http://patents.thx.com/abc/

 

  

Содержание AHB2

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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