listing Argus Elektronix See my other listings . Audio-gd NFB-6 - Description - Used, good condition amplifier from a reputable brand. It includes only a power cord.It has several stereo RCA and XLR inputs as well as balanced pre-amp output, unbalanced pre-amp output, and balanced and unbalanced headphone outputs. I bought it used and tried reselling it earlier, but it was returned to me with mild shipping damage, shown in photos. There are two nicked corners on the front plate and a pair of RCA inputs on the back had to be replaced. The photos show the new RCA inputs (the shinier ones) installed to ensure that the amp is fully working.The original owner bought this amp with OCC copper wiring, which mildly enhances how transparent the amp is. Highly transparent and hi-fi amplifier/pre-amplifier, best paired with a high-end or otherwise upscale DAC.Suitable for dynamic headphones of any kind, any impedance, and most, if not all, orthodynamics.This amplifier is the same as the NFB-1amp, but its relay-based volume control has 80 steps instead of 100 like the NFB-1amp. So it is one of Audio-gds finest amplifiers in this mid-size form factor. I upgraded to an Audio-gd Reference unit and no longer have use for this fine unit. I dont recommend trying to undo the dent in the rear end of the chassis unless you really know what you are doing. - Shipping - Ships Monday through Friday within 24-72 hours after receiving payment. Tracking will be included. - Returns - Returns accepted within 30 days. Buyer is responsible for returning the item in the same condition as it was received. If you are unsure how to pack the item for safe travel, please do not hesitate to ask me. Feel free to ask me any questions.

Audio GD VINTAGE NFB 3 Digital Analog Converter Rare to find this device, wonderful reliable DAC

Audio GD VINTAGE NFB 3 Digital Analog Converter Rare to find this device, wonderful reliable DAC

Product Description Page: http://audio-gd.com/Pro/Headphoneamp/NFB16/NFB16EN.htm Nice little unit that I didnt need after acquiring a few other Audio GD pieces. Requires 230V (European Plug) which is not included but easy to source online. Smoke free home. Bid with confidence!

This Audio GD NFB-12 DAC/Amp is the perfect addition to your home audio system. With its high-quality sound and powerful performance, you'll be able to enjoy your favorite tunes like never before. Designed by the trusted brand Audio GD, this model is a must-have for any music lover. This is a used NFB-12 unit, please see all the photos.

Used N11.28 DAC. Tested working. No power cable included

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!

I am the original Owner. This unit is in excellent condition and was not used very often. Has always sounded pristine quality. Amazing build quality. It is an excellent DAC and can interface with RCA COAX (digital) and/or Optical. It provides RCA outputs and some mini version of what looks like an XLR-type of connector The Audio gd web page that describes the NFB 2 and the NFB 3.1 (differences) is located at:http://www.audio-gd.com/Pro/dac/NFB-2/NFB2EN.htm Operating Instructions: http://www.audio-gd.com/Pro/dac/NFB3-2011/NFB3-384EN_Use.htm The unit is shipped with an AC power cord. No other items included. Fully discrete amp without any OPA , couple caps ,non- feedback analog output stage and non-feedback Class A power supplies .The NFB-3.1 applies 2 groups ofclass A parallel connection PSU supplied for analog output stage, (the analog output stage power supply is very important, so we keep the 2 groups of class A parallel connection PSU here). Another 5 groups of linear PSUs supplied for other parts. The NFB-3.1 applies a toroidal transformer. The NFB-3.1 applies mostly 1% SMD resistors and caps. The NFB-3.1 have digital filter setting by software.Dual WM8741 inside ACSS /RCA output DAC Coaxial/Optical/USB input 24Bit / 96KHz USB input and 24Bit / 192KHz Coaxial/Opitcal support SNR 128DB (Mono)Dynamic Range 128DB (Mono)

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 .

Audio-gd NFB-12 Headphone AMP/DAC Preamps This item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition

Audio-GD NFB-12 DAC/ Headphone Amplifier w/PowerThis item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition.

Another great sounding DAC on offer here. Specs were and still are impressive for the time. Highly versatile box featuring a headphone amplifier with DAC and can also act as a preamplifier as well. 3 inputs: Optical, Coaxial RCA and USB. Sounds and looks great! What you see is what you will receive. If you need a power cable, let me know after purchasing and Ill find one to throw in. Will be carefully packaged for safe transit. Lower 48 domestic sale only. No international orders. This is a 120v unit! http://audio-gd.com/Pro/Headphoneamp/NFB11/NFB11EN.htm

Audio-GD NFB-12 DAC/ Headphone Amplifier w/PowerThis item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition.

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-12 DAC / Headphone Amplifier w/ Power This item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition

Audio-gd NFB-10SE Dac/Amp. This Dac/Preamp/Headphone amp combo unit is in perfect working condition with some minor cosmetic blemishes that do not affect the performance. This particular unit does require 240v input, but that can easily be fixed with a voltage step up converter.NFB means Non-FeedBack. NFB-10SE uses the latest high-end “Dual WM8741” which can support up to 32Bit/192KHz input. Similar to other WM8741 designs, NFB-10SE applies Non-feedback ACSS output stage. The “Dual WM8741” feeds to the ACSS output stage without any Operational Amplifier (OPA) so it can achieve very neutral sound. The ACSS technology is a non-feedback technology made with fully discrete amplifiers. Most people know that the global feedback design offers better specifications in measurements than non-feedback design. However, non-feedback design offers better sound for human ears, which is a drawback of the conventional circuits. But the ACSS technology opens a new era, it offers the least coloration sound which is very neutral with very low distortion and high linearity. It retains the dynamics, details and neutrality but does not sound bright or harsh. The output buffers are also non-feedback. In order to maintain low impedance, we applied a diamond output stage which is quite less colored than most conventional circuits. The analog stage does not use couple cap to avoid coloration. The 32bit/192KHz USB interface outputs an I2S signal to the “Dual WM8741”. NFB-10SE applies the WM8805 as the SPDIF interface; its sound characteristic is the same as the WM8741, which is detailed and smooth and supports up to 192KHz. The WM8805 has quite low jitter (50PS). Output impedance ?2 ohm Output Level ? Headphone output : 19V RMS (balanced , max) Preamp Variable output (balanced) : 10V RMS (max) Preamp Variable output (RCA) : 5V RMS (max) Fixed output (balanced): 5V RMS Fixed output (RCA): 2.5V RMS ACSS? 2MA+2MAHeadphone amp output power level (Only for headphone.) Balanced mode 9950MW / 25 ohm 5950MW / 50 ohm 3300MW / 100 ohm 1150MW / 300 ohm 590MW / 600 ohm ?Headphone amp output power level (Only for headphone.) Single-ended mode ?3300MW / 25 ohm 1650MW / 50 ohm 850MW / 100 ohm 300MW / 300 ohm 150MW / 600 ohmInput Sensitivity 0.5 Vp-p (75 Ohms, Coaxial) 19 dBm (Optical) USB1.1 USB2.0 (Full Speed, Class2) ?Frequency Response 20Hz - 20KHz ?-0.2DB? ? Support Operate Systems (USB) ? 44.1kHz to 192kHz?Support Sampling USB model : 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz Coaxial model: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 192kHz Optical model: 44.1kHz, 48kHz, 88.2kHz, 96kHz ?Power Requirement 220-240V AC 50/60 Hz ?Power Consumption 17W ?Package Weight Approximately 5KG ? Dimensions ?W240 X L360 X H80 mm (Fully aluminum) Accessories AC power cord X1 ?

Mint Condition... *USB INTERFACE ISNT WORKING, NEED UPDATE... (Amanero Combo 384 with USB isolator) Discrete DAC + Headphone amplifier / Preamplifier Built in FPGA processor , reject the jitter DSD , DXD support from USB &I2S Dual 32bit / 768K Sabre ES9038Pro 32bit / 384K Asynchronous Transfer Amanero Combo 384 with USB isolator Built in OCC and TCXO ,no upgrade options 9000mW at 40 ohm (Pure Class A, per channels )

Audio-GD NFB-12 DAC / Headphone Amplifier w/ Power This item is pre-owned and may show some slight signs of wear due to normal use. This item is in good condition overall. Tested and is 100% fully functional. Please look at the photos to make your own determination of this items condition

I have a replacement fiio dac which does me fine, so selling this - it was a bit of an overkill.in excellent working condition AUDIO-GD NFB-15 .32 with power supply, usb cable to connec to computer and coaxial cable.this device can also be connected via optical which is greati had these set up with my yamaha hs7 summary website: http://www.audio-gd.com/Pro/Headphoneamp/NFB1532/NFB15.32EN.htmSummarize Fully discrete analog stages without any OPA and couple caps in the signal channels. Non- feedback ACSS analog output stage . Total of 6 groups dedicated power circuits are used to purify the power supply. Applies a custom order ALPS 27 volume pot for reducing channel imbalance and improving on sound quality. 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 Supports 2X , 4X and 8X oversampling customers setting High-End grade parts built in , ALPS 27 volume pot , Toshiba optical receiver and transistors , gold plate pure copper RCA sockets ect.