JDS Labs Objective2 Bundle

Description

I'm selling a JDS Labs stack as a set that's been discontinued.  Within the set includes the Objective2 headphone amplifier, Subjective3 preamp, OL Switcher (to open another input and a couple more outputs), and OL DAC.  This has been a wonderful stack and introduced me to the world of audio, offering extremely transparent audio delivery the way the artist intended to the recording to be heard.  One of my favorite parts of this stack is that it allows space to emphasize the mids, and can deliver a wider sound-stage on par with some of the best amplifiers out there. Paired with the right headphones, this stack will deliver amazing detail in recordings and will breathe new life into your music. For me, the right headphones involved a Grados RS2e and a Sennheiser HD 650.
The Objective2 was designed by the legendary NWAVGuy, who dropped the schematics on his blog in an effort to challenge the Audio industry to provide better/measurable equipment before he mysteriously disappeared.  You can find his blog here: http://nwavguy.blogspot.com/2011/07/o2-headphone-amp.html
I know there are a few other brands that create and distribute the Objective2, but I enjoyed the rigid build by JDS Labs... it just feels more durable to me.
To sweeten the pot, I've added 3 sets of  JDS Labs stackable cables, an optical cable, among a couple of other cables to help the buyer get started. Three power adapters that came with the stack are also included along with original boxes.
The Objective2, accompanied with the Subjective3 to add color and the OL DAC to convert a digital signal from your computer to the amplifier makes for a complete stack.  Now that the line has been discontinued by JDS Labs, they really don't make them like this anymore.
Below I've added the tech specs for each item:
JDS LabsObjective2 Headphone Amplifier (Found here: https://jdslabs.com/product/objective2/ - but for the sake of convenience, I've placed the tech specs and description below
Objective2 is an opensource amplifier designed by brilliant engineer NwAvGuy, with emphasis on benchmark performance and low cost. Objective2 arrives fully assembled, hand tested, and ready to enjoy. Made in the USA.
Features
REFERENCE GRADE SOUND
Objective2 achieves vanishingly low THD and noise performance for audible perfection.
LOW OUTPUT IMPEDANCE
Objective2's extremely low output impedance ensures transparent frequency response for all headphone loads.
POWER
At over 600mW, Objective2 provides enough output power to drive all dynamic headphones on the market with authority.
Specifications
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
Configuration
Gain
1.0x and 3.3x
Volume Potentiometer Taper
Alps 15A
JDS Labs Subjective3 Pre-amplifier (found here: https://jdslabs.com/product/subjective3/ - but for the sake of convenience, I've placed the description and tech specs below.
COLOR YOUR LISTENING
We're all about making listening more enjoyable. Transparent amplifiers and DACs bring perfection, but maybe you itch to tweak your sound. Subjective3 is a fun three-band equalizer, enabling you to customize bass, mids, and highs. Or, switch to Bypass mode to let the sound flow through unaltered. A must for any desktop audio enthusiast.
Features
100% ANALOG
While you can probably find a software equalizer for your favorite music app, the Subjective3 equalizer is fully analog in nature, so it works with every app and avoids digital re-sampling.
3-BANDS
The Subjective3 Equalizer has a wide adjustment range of +/-15dB for bass, mids, and treble. The point of an EQ is to tune your listening experience. Subjective3 adds color while achieving low THD+N with its knobs in their neutral positions.
BYPASS MODE
A muting relay eliminates turn on/off transients, and when the EQ is switched off, the original audio signal passes directly to its RCA output jacks.
Specifications
Performance
THD+N, 20-20kHz
0.0022%
Noise (A-Weighted)
-104 dBV
IMD CCIF 19/20 kHz -6.03 dBFS
0.001%
IMD SMPTE -6.03 dBFS
0.0009%
Input Sensitivity
>2VRMS
Crosstalk (1kHz)
-69 dB
Bass Adj. Range
±16.5 dB
Mids Adj. Range
±14.9 dB
Treble Adj. Range
±15.2 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
12 oz
Connectivity
Inputs
RCA
Output
RCA
Power
15VAC
JDS Labs OL Switcher (found here: https://jdslabs.com/product/ol-switcher/ - but for the sake of convenience, I've added the description and tech specs below)
VERSATILITY
OL Switcher is the solution to your input/output woes, enabling you to route your audio where needed, without fumbling with cables. OL Switcher is a 2 input, 2 output, passively attenuating preamp. Connect a DAC, connect a DAP, connect a headphone amp, and your speaker system.
Features
DUAL INPUTS
Connect up to two audio sources, such as a DAC, phono preamp, DAP, etc. Quickly switch between your two devices using the Input slider switch.
PASSIVE ATTENUATION
Input passes through an Alps 10k potentiometer for volume adjustment of your selected audio source.
DUAL OUTPUTS
Connect one or two output devices to quickly pass your selected audio source to your desired load, such as a headphone amplifier, powered speakers, receiver, etc.
Specifications
Dimensions
Case Dimensions
4.27 x 3.15 x 1.16 in
Weight
12 oz
Connectivity
Input A
RCA
Input B
3.5mm
Output A
RCA
Output B
3.5mm
JDS Labs OL DAC (found here: https://jdslabs.com/product/ol-dac/ - but for the sake of convenience, I've added the description and the tech specs below.
FANTASTIC VALUE
We decided to set the highest bar with OL DAC, by far outperforming ODAC and eclipsing the sea of alternatives beyond just benchmarks. OL DAC's external AC power supply ensures 100% consistent noise performance and its relay muting eliminates power-up transients; while the minimalist USB Edition relies on the same external AC powered design minus relay muting and optical input.
Features
OPTICAL AND USB INPUTS
OL DAC provides the basics. Its USB Audio Class 1 engine is plug-and-play with all operating systems, and optional optical input expands connectivity to home entertainment. Mode is easily selected by a front mounted slider switch.
DIFFERENTIAL SUMMING OUTPUT
Differential output of the AK4490EQ DAC is summed by a low noise amplifier, with DC coupling throughout. Directly drive any load!
EXTERNALLY POWERED
OL DAC is powered by the same circuitry developed for our flagship EL DAC, using an AC power adapter and 9 linear regulators to ensure consistent rail voltage and super low ripple (no USB power). Never be bothered by USB hubs or OS power management configuration again!
Specifications
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 (Optical)
16/44.1kHz thru 24/192kHz**
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 and TOSLINK
DAC Line-Output
RCA