Audio GD NFB 11.28, preamp, DAC, headphone amp. Used but great condition. All functions work as intended. With aftermarket power cord and feet (the original feet were tiny stick on rubber stick ones that fell off). Will pack with care. Pickup around Knoxville Tn welcome. Thanks for looking!

Selling this beast of a headphone Amp Dac Pre Amp by Audio GD. This is the NFB 11-28 Jam packed with features. Comes with power cord. May show slight signs wear but presents very wellI. Items other than the Audio GD pictured ARE NOT INCLUDEDDirect from manufacturer. Fully discrete analog stages without any OPA and de-coupling caps in the signal path. Non- feedback ACSS analog amplifiers . Built with 4 pcs 20W (in total 80W) high speed Toshiba output transistors, able to drive most of the headphones out there . Total of 6 groups dedicated power circuits are used to purify the power supply. High-End grade parts built in , ALPS 27 volume pot . CMC pure copper RCA sockets ect. 3 channels digital input : coaxial / Optical / USB DAC output : RCA (User can setting with either variable level as DAC with preamp combo or fixed output level as dedicated DAC ) Headphone output : 6.3MM SE The NFB-11 applies the newest ESS high-end Sabre32 DA chip ES9028 which can support up to 32Bit/384KHz input . To be achieve the best performance of ES9028 , must work in current output mode. in voltage output model, there is -12DB THD+N loss . The standard current model design usually need 3 amps (OPA) , the first amp implements I/V conversion, the ES9028 output current signal to voltage signal . The second amp is responsible for conversion balanced signal ,to single-ended signal and implement the low pass analog filter , then go through the volume control fed to the third amp, (the headphone amp ). Every amp usually have two gain stages built in to the ES9028 chip . Signal must go through total of 6 gain stages and finally arrive at the output stage. The NFB-11 applies Non-feedback ACSS design. The ES9028 feed to the ACSS circuit without any OPAs . The ACSS circuit naturally working in current mode . The ACSS amp only have one current gain stage , the ES9028 output signal only goes through one stage . The shortest signal path can reproduce the best detail and dynamics almost without any sound coloration .It showes the real performance of the ES9028 dac. So our ACSS design is the best combo with ES9028 to achieve the best performance .

Selling this beast of a headphone Amp Dac Pre Amp by Audio GD. This is the NFB 11-28 Jam packed with features. Comes with power cord. May show slight signs wear but presents very wellI. Items other than the Audio GD pictured ARE NOT INCLUDEDDirect from manufacturer. Fully discrete analog stages without any OPA and de-coupling caps in the signal path. Non- feedback ACSS analog amplifiers . Built with 4 pcs 20W (in total 80W) high speed Toshiba output transistors, able to drive most of the headphones out there . Total of 6 groups dedicated power circuits are used to purify the power supply. High-End grade parts built in , ALPS 27 volume pot . CMC pure copper RCA sockets ect. 3 channels digital input : coaxial / Optical / USB DAC output : RCA (User can setting with either variable level as DAC with preamp combo or fixed output level as dedicated DAC ) Headphone output : 6.3MM SE The NFB-11 applies the newest ESS high-end Sabre32 DA chip ES9028 which can support up to 32Bit/384KHz input . To be achieve the best performance of ES9028 , must work in current output mode. in voltage output model, there is -12DB THD+N loss . The standard current model design usually need 3 amps (OPA) , the first amp implements I/V conversion, the ES9028 output current signal to voltage signal . The second amp is responsible for conversion balanced signal ,to single-ended signal and implement the low pass analog filter , then go through the volume control fed to the third amp, (the headphone amp ). Every amp usually have two gain stages built in to the ES9028 chip . Signal must go through total of 6 gain stages and finally arrive at the output stage. The NFB-11 applies Non-feedback ACSS design. The ES9028 feed to the ACSS circuit without any OPAs . The ACSS circuit naturally working in current mode . The ACSS amp only have one current gain stage , the ES9028 output signal only goes through one stage . The shortest signal path can reproduce the best detail and dynamics almost without any sound coloration .It showes the real performance of the ES9028 dac. So our ACSS design is the best combo with ES9028 to achieve the best performance .

Selling this beast of a headphone Amp Dac Pre Amp by Audio GD. This is the NFB 11-28 I won’t accept anything less than 20% off list. Comes with power cord and I can throw in a USB cable. May show slight signs wear but presents very well. Dragon not for sale nor any other equipment possibly shown except the Audio gd NFB 11-28 Direct from manufacturer. Fully discrete analog stages without any OPA and de-coupling caps in the signal path. Non- feedback ACSS analog amplifiers . Built with 4 pcs 20W (in total 80W) high speed Toshiba output transistors, able to drive most of the headphones out there . Total of 6 groups dedicated power circuits are used to purify the power supply. High-End grade parts built in , ALPS 27 volume pot . CMC pure copper RCA sockets ect. 3 channels digital input : coaxial / Optical / USB DAC output : RCA (User can setting with either variable level as DAC with preamp combo or fixed output level as dedicated DAC ) Headphone output : 6.3MM SE The NFB-11 applies the newest ESS high-end Sabre32 DA chip ES9028 which can support up to 32Bit/384KHz input . To be achieve the best performance of ES9028 , must work in current output mode. in voltage output model, there is -12DB THD+N loss . The standard current model design usually need 3 amps (OPA) , the first amp implements I/V conversion, the ES9028 output current signal to voltage signal . The second amp is responsible for conversion balanced signal ,to single-ended signal and implement the low pass analog filter , then go through the volume control fed to the third amp, (the headphone amp ). Every amp usually have two gain stages built in to the ES9028 chip . Signal must go through total of 6 gain stages and finally arrive at the output stage. The NFB-11 applies Non-feedback ACSS design. The ES9028 feed to the ACSS circuit without any OPAs . The ACSS circuit naturally working in current mode . The ACSS amp only have one current gain stage , the ES9028 output signal only goes through one stage . The shortest signal path can reproduce the best detail and dynamics almost without any sound coloration .It showes the real performance of the ES9028 dac. So our ACSS design is the best combo with ES9028 to achieve the best performance .

I am the second owner of this device. Bought it from original owner in 2019 and has been my daily driver ever since. The device is in great working condition and overall is well-maintained. Will come with power and USB cable. As shown last couple pictures: 1) Minor scratch on bottom surface not visible during use 2) Barely visible hairline scratches on volume knob - really have to play around with the lighting and angle to catch it Note: requires 1/4” end to connect to DAC/AMP

Audio-GD – NFB-11.28 Kopfhörerverstärker mit DAC - DEFEKTSabre ES9028Pro Dac-ChipEingang über USB, coaxial oder optischAusgang über Cinch oder 6,35mm Kopfhörerbuchse (mit ordentlich Leistung auch für hochohmige Kopfhörer!)geliefert wird das Gerät mit Netzstecker Das Gerät wird als DEFEKT angeboten, da es sich seit kurzem einfach abschaltet und dann entweder sofort, nach ein paar Sekunden oder nach leichtem Ruckeln am Netzstecker wieder startet und normal weiterläuft (bis zum nächsten Aussetzer). Ein Wackelkontakt? Für elektronisch versierte Bastler bestimmt interessant!

The venerated and now hard to find NFB-11.28. This is an amazing all in one unit that greatly simplified my desk. Work life is changing, so this unit needs to find a new home. The unit has some marks on it. In some cases the switches are a bit slow to respond, but they do eventually kick over. This unit is wired for 240v, but Im including a high quality grounded step up converter which means that wont be a problem. This includes two power cables and a USB cable (not pictured).

selling no longer needed. Works perfect. Comes with plug usb cable. Item has minor marks and light scratches from use. AUDIO-GD NFB-11.28 No returns