The silver Benchmark DAC3-L Reference DAC Stereo Preamp Remote Silverfrom Benchmark DAC3-L Reference DAC Stereo Preamp Remote Silveris a two-channel reference preamplifier with a built-in digital to analog converter system. It is capable of converting Direct Stream Digital (DSD) signals as well as Pulse Code Modulation (PCM) files up to 24-bit / 192 kHz. Designed as an output device for computer-based media, the DAC3-L can be used with home media servers, digital audio workstations, desktop audio editing applications, and computer-based radio broadcast systems. The DAC3-L maintains the familiar DAC2 form factor and feature set, but delivers the higher performance available from the ES9028PRO D/A converter chip.

The 8-channel/32-bit ESS Technologies ES9028PRO chip features two distortion compensation systems, which independently remove most of the 2nd and 3rd harmonic distortion in the D/A converter. It also uses 4:1 summing to form each of the two output channels. This results in an enhanced frequency response and a 6 dB signal to noise improvement with low THD and THD+N noise.

The DAC3-L follows sample-rate changes initiated by your computer or software and uses a multimode asynchronous USB system for data transfer. This allows the unit to act as the clock master, reducing jitter by first transferring the audio data from your computer to an internal buffer, and then to the digital to analog subsystem. The dual data transfer uses Benchmark's proprietary UltraLock3 jitter attenuation system, reducing jitter noise and distortion to at least 140 dB below the level of the audio.

The Hybrid Gain Control (HGC) combines the unit's active analog gain control, passive low-impedance attenuators, 32-bit digital gain control, and servo-driven volume control. The HGC provides the dynamic range of an analog system and the accuracy of digital control. All analog inputs are controlled in the analog system and digital inputs in the digital system. The 32-bit Digital Signal Processing (DSP) also provides up to 3.5 dBFS excess digital headroom throughout the entire conversion process.

The DAC3-L features a variety of input and output options including two stereo unbalanced analog RCA inputs, two optical TOSLINK digital inputs, two coaxial digital inputs, one USB digital input, two stereo analog unbalanced RCA outputs, and one stereo analog balanced XLR output. It is compatible with the Benchmark IR remote control (included).

ES9028PRO Converter Chip    Quad 32-Bit Balanced D/A Conversion    Hybrid Gain Control Technology    Native PCM or DSD Conversion    UltraLock Jitter Attenuation System    Asynchronous USB 1.1 and USB 2.0 System    High-Fidelity Preamplifier    Distributed Power Supply Regulation    Home Theater Bypass    Includes Remote Control

2-channel D/A converter designed for maximum transparency—converters are ideal for critical reference-quality professional systems

8-channel/32-bit ESS Technologies ES9028PRO converter chip uses 4:1 summing to form each of the two output channels—achieves a 6 dB signal to noise improvement with low THD and THD+N noise

ES9028PRO features two distortion compensation systems that independently remove most of the 2nd and 3rd harmonic distortion in the D/A converter

High-headroom DSP is designed to handle signals as high as +3.5 dBFS in the entire conversion system and prevents common DSP overloads

All digital inputs support native PCM or DSD conversion

All inputs are fully isolated from interface jitter by Benchmark's UltraLock3 jitter attenuation system

Hybrid Gain Control system combines active analog gain control, passive low-impedance attenuators, 32-bit digital gain control, and a servo-driven volume control—all inputs are controlled by the rotary volume control, which also moves in response to commands from the remote control (included)

Analog inputs are never converted to digital, and digital inputs never pass through an analog potentiometer

Digital inputs are controlled in the 32-bit DSP system to preserve precise L/R balance and precise stereo imaging, while avoiding any source of noise and distortion

USB system supports USB Audio 1.1 for sample rates up to 96 kHz and USB Audio 2.0 for high-resolution 192 kHz and DSD playback—system is frequency agile and will follow sample rate changes initiated by the computer and/or the media playback software

Sample-rate and word-length displays confirm the proper operation of your media player

High-fidelity preamplifier includes input selection, volume control, and output buffering functions—high-current output stage can be programmed to match the input sensitivity of your power amplifier or powered speakers

Programmable Home Theater Bypass function sets the pass-through gain to unity for integration of a home theater audio system via the RCA inputs

Second coaxial input can be reconfigured as a digital output—in output mode, any selected digital input, including USB, will pass through to the coaxial output

12-volt trigger connection can be used as an input, output or both, and is compatible with any common 12-volt trigger input or output—the trigger can be used to turn a power amplifier on or off automatically or respond to a 12-volt trigger and follow the actions of another audio component

Distributed power supply regulation to achieve the lowest possible noise—each critical subsystem has at least one dedicated low-noise voltage regulator

Compatible with Benchmark IR remote control (included)—all functions can be controlled from the front panel or from the remote

Designed, assembled, and tested in the USA using USA and imported components—most major components are made in the USA

DAC3 vs. DAC2

The DAC3 maintains the familiar DAC2 form factor and feature set but adds the higher performance available from the ES9028PRO D/A converter

• Active 2nd Harmonic Compensation
• Active 3rd Harmonic Compensation
• Lower THD+N
• Lower passband ripple
• Improved frequency response
• Faster PLL lock times
• Faster switching between input signals

DAC3 vs. DAC1

The DAC3 and DAC2 added these features not found on the DAC1:

• Asynchronous 192 kHz USB Audio 2.0
• 32-bit D/A conversion system
• Word Length Display
• Sample Rate Display
• Polarity Control
• Direct DSD D/A Conversion
• -20 dB DIM
• Bi-Directional 12V Trigger
• Power Switch with Auto-On Function
• Home Theater Bypass
• Digital Pass-Through
• High-Headroom DSP
• Dual-Domain Hybrid Gain Control
• Additional I/O

Related Questions and Answers

Q: 1. Is this HD650 comes with black or silver drivers? There is a sound quality improvements with the silver ones. Thank you very much!

A: All the critical parts I can see on either side are silver/metallic. There is plenty of black plastic in there, too, but it all looks like structural support for the silvery parts. I took off the earcup padding and thin foam cover, but that's as much disassembly as I feel safe doing.

Q: 2. Is this hardware version 1.1? If so it will have dip switches on back of unit. This allows home theater bypass.

A: The SPL Elector Preamp has 4 dip switches on the back. This and further details can be found on the SPL product page for the Elector Preamp, linked here: https://spl.audio/en/spl-produkt/elector/

Q: 3. Must i use it only with amplifier or it good works with directly PC soundcard?

A: Most PC sound cards will not drive these 300 Ohm headphones. Use a headphone amplifier.

Q: 4. Made in China or Germany?

A: The Sennheiser HD 650 was manufactured in Romania.

Q: 5. just how good is this amp? give me a comparison .

A: This model is known for its very low self noise and high signal to noise ratio using Benchmark's DAC3 digital to analog converter. It is also known for its ability to output at higher levels without introducing distortion into the signal. Further details can be found on the AHB2 product page on Benchmark's site, linked here: https://benchmarkmedia.com/products/benchmark-ahb2-power-amplifier

Q: 6. Does the HD650 come with a set of replacement earcups?

A: No they do not,

Q: 7. Please explain the mono switch. What I'm looking for his a device that will mix the stereo channels into mono and deliver the mono signal to both headphones channels. Can this unit do that?

A: The stereo/mono switch sums the stereo input to mono. In this mode all headsets connected will be fed a mono signal. (Same signal to both left and right).

Q: 8. Will these work with the new Cambridge dac, from the headphone jack of the PC?

A: These headphones would work with a DAC such as the DACMagic 200M BH #CAC11217.

Q: 9. What exactly does Output Impedance Minimum 10 ?, per channel mean? I'm trying to find out the actual impendance output of this amp and I don't know what they mean by minimum ? Can anyone clear this up for me? Thanks.

A: Don't buy this unit it's a piece of junk it doesn't work.

Q: 10. How do you plug this into your MacBook Pro for listening to music? My late-2013 MBP does not have a "mini-USB" port. Thank you for your help!

A: The connection to your Macbook would be USB-A, the Micro-USB 2.0 connector is on the Grace Design m900 DAC. 2 USB 2.0 Type A Male to Micro Type B Male Cables are include in the box.