New! Holo Cyan2 Isolation

The combination of DAC•WRAP (for magnetic fields), USB•FILTER & USB•CABLE (for USB signal) and RF•STOP (for AC power) dramatically improves transparency.

Holo Cyan2 Isolation

Latest Blog Posts

USB DAC Isolation (feat. Holo Cyan2!)

February 13, 2025

There are a growing number of DACs in the marketplace: affordable and competent and mainly Chinese: Topping, S.M.S.L, Gustard, Denafrips, Holo Audi...

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The Incredible RF•STOP SE Signal Filter

January 29, 2025

My product development iteration involves improving my output chain as I reveal more transparency at the DAC and upstream. So when a change is made...

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REFERENCE•M2 System - January 2025 Update (Revised)

January 29, 2025

I have updated my REFERENCE•M2 Systems. I want to emphasize the following updates: USB and DX (DBNC) Version. The DX (DBNC) version is now compleme...

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PGGB-RT for foobar2000 - New Release!

January 21, 2025

PGGB-RT for foobar2000 has been updated to PGGB v7 core technology and has been overhauled to support 64-bit foobar plus improve performance and st...

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PGGB+REFERENCE•M2 = Digital to Analog Nirvana?

November 03, 2024

The consensus among audiophiles, who are invested in both analog (vinyl or tape) and digital (CD’s or digital downloads), is that analog provides t...

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Toronto AudioFest Testimonial

October 27, 2024

Thanks to R. Lee for his posted comments (transcribed from this Head-Fi Post ) Audiowise RF Isolation SystemLet me start by saying that the sound c...

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Featured Products

SRC•DX USB to Single/Dual-Coax Bridge

$165.00

OPTO•DX Optical Isolation for Dual-Coax DACs

$625.00

BNC/Coax Patch Cable

$15.00

DBNC Adapter for Hugo2/Mojo2

$55.00

DC•BLOCK & LP•FILTER for Coax DACs

$125.00

OPTO•USB Optical Isolation

$530.00

USB•FILTER

$47.50

PURE•DC Ultracapacitor Power Supply

$1,120.00

RF•STOP Faraday Isolation Box

~~$2,995.00~~ $1,995.00 Sale

DAC•WRAP Magnetic Shield

BNC/Coax Adapter Assembly

$55.00

USB•CABLE

$24.00

OPTO•DX Optical Cables (Pair)

$45.00

RF•STOP AC Power Cable

$85.00

STABILANT•22 Contact Enhancer for Vibration Isolation

$45.00

PGGB•IT! Offline Upsampling

~~$199.00~~ $0.00 Sale

PGGB-RT for foobar2000

$0.00

REFERENCE•M2/USB

$7,355.00

Dan's Reference System Testimonials

I have finicky ears but when I heard the distinction and texture of voices, instruments and room atmosphere, my first thought was "Wow! This is not digital music, it is too clear and natural to be digital.”
John S., Canada. Musician, Vocalist, Media & Entertainment Professional

The level of detail is quite nice ...I'm hearing things in the track I did not know were there. Vocals have a natural warmth and I can definitely sense the room and the space around the instruments.
John V.S., Canada. Musician, Recording Engineer, Live Audio Technician

What an incredible experience. From Die Fledermaus to Buck Owens, I've never heard such dynamic range. Instruments and vocals just pop out ...violin, piano, xylophone, percussion ...all sound unbelievably real. Jumping Jesus!
Branko P., Canada. Musician, Master Transcriber, Lifelong Music Lover

An incredibly high ceiling and sense of space without any noise or hiss. Everything sounds so smooth and supple ...no harshness or fatigue at all. The individuality and nuances of instruments and vocals are quite identifiable.
Nicki N., Canada. Singer/Songwriter, Sound Engineer

The music sounded as pure as a live studio experience ...truly present and immersive with incredible detail and dynamic range. If sound was water, it soaks you wet.
Steven J., Canada. Music Teacher (Strings, Vocals)

The sense of space created was unique to my recorded listening experience. I could hear exactly what instruments were in what position and with excellent timbre. The impression was of a live performance ...a wall of music would engulf me and I would listen to the little intricacies as I never have before.
Michael K., Canada. Classically Trained Pianist

This is silky smooth conversion with crystal clear transients and spatial cues. Sounds like the bass amp is in the room! I find myself fully enjoying the music while also able to easily discern the mix effects and recording techniques used. Nice shit! This is as good as I have heard.
Mike B., Canada. Sound Engineer, MuchMusic, CityTV (Toronto)

I have finicky ears but when I heard the distinction and texture of voices, instruments and room atmosphere, my first thought was "Wow! This is not digital music, it is too clear and natural to be digital.”
John S., Canada. Musician, Vocalist, Media & Entertainment Professional

The level of detail is quite nice ...I'm hearing things in the track I did not know were there. Vocals have a natural warmth and I can definitely sense the room and the space around the instruments.
John V.S., Canada. Musician, Recording Engineer, Live Audio Technician

What an incredible experience. From Die Fledermaus to Buck Owens, I've never heard such dynamic range. Instruments and vocals just pop out ...violin, piano, xylophone, percussion ...all sound unbelievably real. Jumping Jesus!
Branko P., Canada. Musician, Master Transcriber, Lifelong Music Lover

An incredibly high ceiling and sense of space without any noise or hiss. Everything sounds so smooth and supple ...no harshness or fatigue at all. The individuality and nuances of instruments and vocals are quite identifiable.
Nicki N., Canada. Singer/Songwriter, Sound Engineer

The sense of space created was unique to my recorded listening experience. I could hear exactly what instruments were in what position and with excellent timbre. The impression was of a live performance ...a wall of music would engulf me and I would listen to the little intricacies as I never have before.
Michael K., Canada. Classically Trained Pianist

OPTO•DX Testimonials

Wow! OPTO•DX is beyond my expectations! I did not know authentic holographic music until now. It's like entering into a whole new level of music listening that I did not know existed. I'm just so happy to have come upon your site and discovered the power of OPTO•DX! Thank you very much Dan!
Dennis W., USA

Having spent multiple tens of thousands on AC power conditioning in the past to what I considered good effect, it’s now abundantly clear that RF contamination is the limiting factor in any system. Your great products combined with battery isolation have produced a music signal that’s cleaner and more pure than I imagined possible.
Evan S., USA

OPTO•DX made a very big difference in my Dave! It was precisely as Audio Bacon described it in his review. I am very satisfied with the purchase and it was an inexpensive upgrade in terms of the improvement in sound quality. Thank you, Dan.
Richard E., Sweden

All I have to say is "Wow!" OPTO•DX is absolutely amazing. I was skeptical but the way it cleans the sound is incredible. Highs in particular are less splashy. Bass is tighter but hits harder. I can listen at volume without sheen or harshness. Instruments have more impact and separation is surgical. My Susvara headphones are holographic as never before. I'm really so impressed! Blog Post
Paul R., USA

My system sounded great but with a hardness that gave me headaches. I tried ferrites on the BNC cable without much success. I then bought OPTO•DX together with RF•STOP Isolation Box and the hardness is completely gone! Now I have glorious sound and I can listen whole day without any headaches. Indeed this is one of the best purchases I have ever made.
Anthony C., Hong Kong

OPTO•DX, for a modest investment and small footprint, has rewarded me with an emotive aural experience. My Dave goes deeper into the mix to reveal subtle details and timbre—I'm now more intimate with my favourite recordings! Less hi-fi, more flesh, blood and guts!
Bharat P., UK

Wow! OPTO•DX is beyond my expectations! I did not know authentic holographic music until now. It's like entering into a whole new level of music listening that I did not know existed. I'm just so happy to have come upon your site and discovered the power of OPTO•DX! Thank you very much Dan!
Dennis W., USA

Having spent multiple tens of thousands on AC power conditioning in the past to what I considered good effect, it’s now abundantly clear that RF contamination is the limiting factor in any system. Your great products combined with battery isolation have produced a music signal that’s cleaner and more pure than I imagined possible.
Evan S., USA

OPTO•DX made a very big difference in my Dave! It was precisely as Audio Bacon described it in his review. I am very satisfied with the purchase and it was an inexpensive upgrade in terms of the improvement in sound quality. Thank you, Dan.
Richard E., Sweden

All I have to say is "Wow!" OPTO•DX is absolutely amazing. I was skeptical but the way it cleans the sound is incredible. Highs in particular are less splashy. Bass is tighter but hits harder. I can listen at volume without sheen or harshness. Instruments have more impact and separation is surgical. My Susvara headphones are holographic as never before. I'm really so impressed! Blog Post
Paul R., USA

My system sounded great but with a hardness that gave me headaches. I tried ferrites on the BNC cable without much success. I then bought OPTO•DX together with RF•STOP Isolation Box and the hardness is completely gone! Now I have glorious sound and I can listen whole day without any headaches. Indeed this is one of the best purchases I have ever made.
Anthony C., Hong Kong

OPTO•DX, for a modest investment and small footprint, has rewarded me with an emotive aural experience. My Dave goes deeper into the mix to reveal subtle details and timbre—I'm now more intimate with my favourite recordings! Less hi-fi, more flesh, blood and guts!
Bharat P., UK

More Testimonials...

I'm loving Dan's upgrades to my DAVE and Qutest. OPTO•DX, DAC•WRAP, DC•BLOCK and RF•STOP Filters have brought new levels of clarity, soundstage and incredible imaging to my systems. Chord owners need this equipment!
Brandon B., USA

The effect of DC•BLOCK in my Mscaler+DAVE system is quite extraordinary, I'd even call it transformational. Clarity is improved by a massive amount, and transients sound super fast. 'Hard' sounds, such as percussion, distorted guitars etc. now appear almost frighteningly physical, with plenty of 'body' and great dynamics.
Erik M., Germany

The benefit of adding SRC•DX to my Dave was immediately obvious. Transients and leading edges were more incisive with more heft. USB direct sounded soft in comparison. SRC•DX was quieter and I love how it made female vocals more present. Definitely a keeper!
Zaphod B., USA

With DAC•Wrap and vibration treatment on my Dave I have elevated my system to class level detail retrieval combined with incredible smoothness and realism! I obtained far larger depth and a few spooky moments where it felt like someone was actually in the room. I am delighted!
Cedric W., UK

SRC•DX was the missing link I needed. I use an Antipodes server with HQPlayer embedded. I am now able to pass maximum quality to my TT2 in the way Chord intended... Dual BNC. The signal is stable (no dropouts) and the sound has a black background with accurately reclaimed transients. Well done Audiowise!
Laurie H., Canada

OPTO•DX and SRC•DX have made a huge impact. My TT2 system is better by every measure. From low level details, openness, transparency, lack of high frequency harshness, soundstage is spectacular along with being able to delineate each instrument/voice ...just fantastic.
Robert G., USA

With my BluMk2 and Dave, OPTO•DX has been a revelation! Hugely transformative!
...Opened up soundstage ... more micro details ...smoother, more liquid and lush. RF•STOP filtered AC power cables replaced my uber pricey power cables throughout my digital chain so now my digital has a bigger soundstage than my vinyl rig. Blog Post
Albert O., USA

SRC•DX and DC•BLOCKs installed on my Qutest definitely adds more drama to my music. Latin jazz and high energy acoustic has much improved attack and brass bites like never before. I can pinpoint instruments easier and everything is clearly and discernibly better. Definitely a worthy addition!

Ricardo P., USA

SRC•DX just arrived and I’m listening to PGGB•IT! upsampled WAV files from JRiver to SRC•DX to Qutest to Anni. My initial impressions are 1) astonishment, 2) pleasure, 3) definitely an enormously worthwhile purchase. SRC•DX is, quite literally, enhanced musical delight to my ears. Thank you for everything, Dan—and bravo!
David K., USA

The effect of DC•BLOCK in my Mscaler+DAVE system is quite extraordinary, I'd even call it transformational. Clarity is improved by a massive amount, and transients sound super fast. 'Hard' sounds, such as percussion, distorted guitars etc. now appear almost frighteningly physical, with plenty of 'body' and great dynamics.
Erik M., Germany

The benefit of adding SRC•DX to my Dave was immediately obvious. Transients and leading edges were more incisive with more heft. USB direct sounded soft in comparison. SRC•DX was quieter and I love how it made female vocals more present. Definitely a keeper!
Zaphod B., USA

AUDIOBACON Reviews OPTO•DX!

The RF Noise Killer...

Check out the review here!

"A much more nuanced, dimensional, and effortless sound ... Perfect resolution and transparency ... Natural soundstage width and depth ... Ambient and atmospheric cues are made more obvious ... Everything sounds consolidated & fully formed ... Neutral Tonal Variations"

Isolate Your DAC

Musical magic (Qualia) happens when your DAC is free from all RFI/EMI on signal (input and output); on power; and radiated through free air. An unfettered analog D/A section and output clock reveals the DACs maximum transparency.

Isolate Cables

Cables tethered to your DAC don't have a 'sound' — they are not tone controls nor a DSP. What they are is conductors and antennae for RFI/EMI. Consider ways to use optical fiber, filtering, shielding and short lengths to limit their impairment.

Isolate & Filter Power

It’s impossible to completely filter RFI/EMI on AC mains. Digital components will inject more of same back into the wall where it will affect your DAC. For best DAC sound, consider batteries with AC/DC inverters or DC power options.

Avoid Crowding

Don’t stack digital components with your DAC; don’t overlay cables and don’t share digital/analog power. Radiated RFI/EMI is insidious …so use distance between components and the space in your listening room to advantage.

Offload Oversampling

Content at maximum input sample rate will reduce a DACs workload for better sound with less internal RFI/EMI. Consider pre-processing with PGGB or HQPlayer for higher quality reconstruction

Pursue Net Zero

Interference from multiple RFI/EMI sources means that a single change to your system may only shift the frequency of emitted energy impacting your DAC. Be pragmatic and diligent — continue making changes that lower RF noise: Zero is your goal and you will be rewarded.

OPTO•USB Optical Isolation

Regular price $530.00 Sale

Option

OPTO•USB is a USB optical isolator that provides RF isolated transmission of high-resolution digital audio from a USB source to DAC. OPTO•USB uses all-dielectric multi-mode optical fiber for total galvanic isolation*. An integrated 30 meter optical cable length allows convenient distancing of digital source & networking components away from sensitive DAC and analog amplification.

Operation with Windows, macOS or Linux is plug-and-play. Supports USB 3.2, USB 3.1 Gen 1, USB 3.0 and is backward compatible with USB 2.0. Transmitter connector is USB 'A' male with 5V power directly from source USB port. Receiver connector is USB 'A' female with an associated USB 'A' male 5V power connector on a 75cm lead (supplemental power is required for optical demodulation).

Use short USB cables or adapters for connection from OPTO•USB receiver USB 'A' female to DAC USB input (USB ‘B’, USB ‘micro B’ or USB-C). Be aware that some 3rd party USB-C/A adapters may introduce RF noise from logic circuits and switch mode DC/DC power conversion for USB-C Power Delivery. Dan recommends the optional USB•FILTER + USB-A Adapters to greatly reduce source RF noise injection.

Dan recommends using PURE•DC @ 5V for ultra-low noise and ultra-low ESR (Equivalent Series Resistance) power for OPTO•USB receiver and DAC. Integrate OPTO•USB with SRC•DX for the ultimate transparency of DBNC input to Chord Electronics DX DACs.

OPTO•USB is a core part of Dan's REFERENCE•M2 system**.

*Avoid USB-over-optical solutions that embed a copper wire in the cable. This will conduct RF and act as an antenna for radiated RF noise.

**OPTO•USB includes user applied heat sinks as the units may get warm after long periods of high resolution audio transmission.