MASSDROP OBJECTIVE 2 HEADPHONE AMP: DESKTOP EDITION. In 2011, audio engineer NwAvGuy published a blog post titled O2 Headphone Amp, in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. Our version of NwAvGuys famous O2 amplifier, the Objective 2 Desktop Edition features updates based on feedback from the community Great little amp! Works flawless.

Mass Drop Objective 2 O2 Headphone Amp & Grace Design Standard DAC MASSDROP OBJECTIVE 2 HEADPHONE AMP: DESKTOP EDITION In 2011, audio engineer NwAvGuy published a blog post titled “O2 Headphone Amp,” in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. Our version of NwAvGuys famous O2 amplifier, the Objective 2 Desktop Edition features updates based on feedback from the community. It’s an ideal baseline reference amplifier, capable of powering everything from IEMs to HD 800s with linear ease. SPECSInput: RCA Output: 6.35 mm Power: Battery (included) or AC adapter (included)Gain: 2.5x and 6.5x / 1.0x and 3.3x (select your configuration)Volume potentiometer taper: Alps 15A or 3BFrequency response: +/-0.1 dB (20 Hz–20 kHz)THD at 1 kHz, 150 ohms: 0.0016%IMD CCIF at 15 ohms: 0.001%IMD SMPTE: 0.002%Noise (ref 400 mV): -105 dBMax output (33 ohms): 613 mWMax output (150 ohms): 355 mWMax output (600 ohms): 88 mWOutput impedance: 0.54 ohmsCrosstalk (15 ohms): -65 dBChannel balance (50% volume): 0.6 dBCase dimensions: 4.12 x 3.87 x 1.12 in (10.46 x 9.82 x 2.85 cm)Weight: 9 oz (255 g)INCLUDED110V AC adapter 2 - 9v rechargeable batteries (installed) RCA CableMassdrop X Grace Design Standard DAC Made in collaboration with Grace Design, a company known for its incredibly accurate, transparent studio gear, the Standard DAC sets a new standard in entry-level DACs. It applies Grace Design’s pro-audio expertise to a simpler, more accessibly priced model that makes a great addition to any home or office system. Designed with the objectivist audiophile in mind, the SDAC delivers objectively good performance meant to meet or exceed the measurements of the popular ODAC while retaining many of its other benefits. Compact, capable, and easy to use, it could be all the DAC you need.SPECS Massdrop x Grace DesignChassis material: Anodized aluminumDAC chip: AKM AK4452Audio formats: Up to 24 bit/96 kHzFrequency response, 20Hz–20 kHz: +/-0.02 dBTHD+N at 20 Hz -0.15 dBFS: 0.0013%THD+N at 100 Hz, -0.15 dBFS: 0.0013%THD+N at 10 kHz, -0.15 dBFS: 0.0024%IMD CCIF, -6.03 dBFS, 19/20kHz, 24/96k: 0.0005%IMD SMPTE -6 dBFS, 24/96k: 0.0015%Noise, A-weighted: -105 dBuDynamic range, A-weighted: >114 dBLinearity, -90 dBFS: -0.07 dBCrosstalk at 1 kHz, -10 dBFS (3.5mm jack): -102 dBSum of jitter components at 11,025 Hz, -1 dBFS: -133 dBMaximum output: 2.15VRMSUSB controller: XMOS XU208-128-TQ64Inputs: USB microOutput: ? in (3.5 mm) TRS, RCAPower: USB Class 1 (no drivers required for Windows, Mac, or Linux)Dimensions, L x W x H: 3.9 x 4.1 x 1.2 in (100 x 104 x 30 mm)Length with RCA port: 4.2 in (105.5 mm)Height with rubber feet: 1.4 in (34 mm)Weight: 7.44 oz (210.8 g)

JDS Labs O2 amplifier and ODAC standalone digital audio converter. These are the original versions released in 2012. Excellent pre-owned condition. Includes original Triad AC adapter and USB cable.

Used Mayflower Electronics Objective O2 Headphone Amplifier ???? Comes with the 15 VAC power cable ???? It has a metal volume knob I’m also including a 10ft 3.5mm aux cable Will ship out the same day ????

Listing Includes: O2 Headphone Amp AC power adapter rca cables 2 9v rechargeable batteries (installed) Grace Designs SDAC usb cable MASSDROP OBJECTIVE 2 HEADPHONE AMP: DESKTOP EDITION In 2011, audio engineer NwAvGuy published a blog post titled “O2 Headphone Amp,” in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. Our version of NwAvGuys famous O2 amplifier, the Objective 2 Desktop Edition features updates based on feedback from the community. It’s an ideal baseline reference amplifier, capable of powering everything from IEMs to HD 800s with linear ease. SPECSInput: RCA Output: 6.35 mm Power: Battery (included) or AC adapter (included)Gain: 2.5x and 6.5x / 1.0x and 3.3x (select your configuration)Volume potentiometer taper: Alps 15A or 3BFrequency response: +/-0.1 dB (20 Hz–20 kHz)THD at 1 kHz, 150 ohms: 0.0016%IMD CCIF at 15 ohms: 0.001%IMD SMPTE: 0.002%Noise (ref 400 mV): -105 dBMax output (33 ohms): 613 mWMax output (150 ohms): 355 mWMax output (600 ohms): 88 mWOutput impedance: 0.54 ohmsCrosstalk (15 ohms): -65 dBChannel balance (50% volume): 0.6 dBCase dimensions: 4.12 x 3.87 x 1.12 in (10.46 x 9.82 x 2.85 cm)Weight: 9 oz (255 g)INCLUDED110V AC adapter 2 - 9v rechargeable batteries (installed) RCA Cable MASSDROP X GRACE DESIGN STANDARD DAC Made in collaboration with Grace Design, a company known for its incredibly accurate, transparent studio gear, the Standard DAC sets a new standard in entry-level DACs. It applies Grace Design’s pro-audio expertise to a simpler, more accessibly priced model that makes a great addition to any home or office system. Designed with the objectivist audiophile in mind, the SDAC delivers objectively good performance meant to meet or exceed the measurements of the popular ODAC while retaining many of its other benefits. Compact, capable, and easy to use, it could be all the DAC you need. SPECSMassdrop x Grace DesignChassis material: Anodized aluminumDAC chip: AKM AK4452Audio formats: Up to 24 bit/96 kHzFrequency response, 20Hz–20 kHz: +/-0.02 dBTHD+N at 20 Hz -0.15 dBFS: 0.0013%THD+N at 100 Hz, -0.15 dBFS: 0.0013%THD+N at 10 kHz, -0.15 dBFS: 0.0024%IMD CCIF, -6.03 dBFS, 19/20kHz, 24/96k: 0.0005%IMD SMPTE -6 dBFS, 24/96k: 0.0015%Noise, A-weighted: -105 dBuDynamic range, A-weighted: >114 dBLinearity, -90 dBFS: -0.07 dBCrosstalk at 1 kHz, -10 dBFS (3.5mm jack): -102 dBSum of jitter components at 11,025 Hz, -1 dBFS: -133 dBMaximum output: 2.15VRMSUSB controller: XMOS XU208-128-TQ64Inputs: USB microOutput: ? in (3.5 mm) TRS, RCAPower: USB Class 1 (no drivers required for Windows, Mac, or Linux)Dimensions, L x W x H: 3.9 x 4.1 x 1.2 in (100 x 104 x 30 mm)Length with RCA port: 4.2 in (105.5 mm)Height with rubber feet: 1.4 in (34 mm)Weight: 7.44 oz (210.8 g)

Mayflower Electronics Objective O2 Headphone Amplifier *30 Day Warranty*DescriptionThe Mayflower Electronics Objective O2 Headphone Amplifier is in GREAT working condition. The System is in used condition. The unit may have scuffs, light scratches, or dings. Please take the time to view the product photos.(Cosmetic damages will not affect the performance of the unit) Listing includes:Mayflower Electronics Objective O2 Headphone AmplifierProduct Specifications BrandMayflower ElectronicsModelO2 Headphone AmplifierWarranty30-Day Warranty does not include damages done by the buyer, only hardware!! Tests conducted on the system are as follows:The item was powered on and tested. It was found to be fully operational with no issues only cosmetic damages. We are experienced sellers of used and new items. We thoroughly inspect and test all of the products we sell and make every attempt to make sure our systems are in excellent working condition. You’ll love our products and we will ensure your satisfaction. If there is anything we can do to make your experience better, just let us know!If any issue occurs, please give us a chance to make it right. Contact us before opening a case. If we make a mistake, please allow us to make it right!! If the item needs to be returned, we will take care of the return shipping. Thank you!! We appreciate your business!! Payment*Paypal, Debit, Credit Card Shipping*Products ship between (1-3) business days once payment has been received and cleared.*Items are mailed Out Monday - Friday only**Local pick ups are always welcome (only by appointment)*No P.O. Box DeliveryShipping carriers: FedEx, UPS, and USPS. Shipping will only be sent to the address provided on checkout. ReturnsItems returned due to buyers remorse, the wrong item purchased, or an operating system not compatible with personal software will be subject to a 20% restocking fee. Please take the time to review the item before purchasing. Any concerns can be addressed by contacting us via the seller dashboard.Our #1 priority is customer satisfaction. If the item is not as described, we will replace the item or a refund will be issued. Hours of OperationMonday - Friday: 10 am - 5 pm Standard Pacific timeSaturday - Sunday: Closed

Mayflower Electronics Objective O2 Headphone Amplifier. The Objective2 (O2) is an open source amplifier designed by NwAvGuy, focusing on benchmark performance and low cost. The end product is a solid, un-colored amplifier that boasts some of the best measured performance in it's category. Standard model includes a new black metal case, brushed aluminium front panel and a rubber volume knob. Includes a power supply (Please choose US, EU/UK or AU plug-type below). The EU/UK and AU power adapters are rated for 220-240v at 50hz. -Benchmark Performance, Un-Filtered Sound -Hand Made and Individually Tested in the USA -Connect to any PC/MAC/Phone with a 3.5mm -Auxiliary Cable (Does NOT include a DAC) -Includes Power Supply -3.5mm Output Jack

Used Mayflower Electronics Objective O2 Headphone Amplifier ???? Comes with the 15 VAC power cable ???? It has a metal volume knob I’m also including a 10ft balanced 3.5mm aux cable Will ship out the same day ????

This is a combination of the original production run of JDSLabs ODAC revB and O2 Amplifier. I believe these units are no longer in production. Purchased on Drop.com 8 years ago, flawlessly running since then. Hundreds of hours of burn-in time. Note the adapter for the amp could use some love, as it’s taped closed right now. Volume pot occasionally scratches on the amp as well. Overall would say these are in “good condition”, totally working with many years of service to go. Will include RCA cables, USB cable, and charger alongside both units.

JDS Labs O2 (Objective 2) Headphone Amplifier & OL DAC USB edition in good condition. Comes with power cords, RCA-to-headphone jack cable, and a USB cable. Thanks for looking!

This is a listing for both a JDS Labs OL DAC and the O2 Headphone Amplifier. Only power adapters are included, there are no additional cables. These units have cosmetic damage such as the paint scratching seen in the photos. They are both fully functional and tested. OL DAC Specification: DAC Performance Frequency Response 10Hz-20kHz (96k) +/- 0.15dB THD+N 20Hz-20kHz < 0.001% IMD CCIF 19/20 kHz -6.03 dBFS 0.00033% IMD SMPTE -6.03 dBFS 0.00031% Noise (A-Weighted) -109 dBu Dynamic Range (A-Weighted) 114 dB Linearity Error -90 dBFS +/-0.01 dB Crosstalk -10 dBFS 100K RCA -108 dB USB Jitter Components 11025Hz -116 dB PCB Stackup 4 Layers Maximum DAC Line-Output, 100K 2.00 VRMS Dimensions Case Dimensions 4.27 x 3.15 x 1.16 in Weight 13 oz Data Support Audio Formats (USB) 16/44.1kHz thru 24/96kHz USB Interface USB Audio Class 1 (UAC1) USB Driver OS Support Windows XP/7/8/10, PS4, OS X, iOS, Linux Connectivity Digital Inputs USB DAC Line-Output RCA O2 Headphone Amplifier: Performance Frequency Response +/-0.1 dB (20Hz-20kHz) THD 1 Khz 150 Ohms 0.0016% IMD CCIF 15 Ohms 0.001% IMD SMPTE 0.002% Noise (ref 400 mV) -105 dB Max Output (33 Ohms) 613 mW Max Output (150 Ohms) 355 mW Max Output (600 Ohms) 88 mW Output Impedance 0.54 ohms Crosstalk (15 ohms) -65 dB Channel Balance (50% volume) 0.6 dB Dimensions Case Dimensions (mm) 108.50 x 80.00 x 29.50 Case Dimensions (in) 4.27 x 3.15 x 1.16 Weight 11oz Connectivity Input RCA Output 6.35mm (1/4) 14-20VAC Configuration Gain 2.5x and 6.5x Volume Potentiometer Taper Alps 15A

JDS Labs O2 (Objective 2) Headphone Amplifier & OL DAC USB edition in good condition. Comes with power cords, RCA-to-headphone jack cable, and a USB cable. Thanks for looking!