For the last five or six days, I have had a QSA Lanedri Gamma Infinity DC extension cable in the house. This is a demo that has been making the rounds here in the Pacific Northwest – thank you QSA Lanedri for providing this opportunity!
I’ve tried the DC extension cable in a few different configurations. I’ll list these in order of their greatest positive impact on my system.
Between power supply and router:
My router is the one approved by my ISP and it is a Greenwave C4000XG. I selected it because it is compatible with my internet service, not because of any special audiophile qualities. It accepts an ethernet input from an ONT that converts fiber to ethernet. I have a very long run (60 to 80 feet) of generic Cat 6 ethernet cable going from the router to a wall port in my living room, where I run more generic ethernet to an Uptone EtherRegen switch, and then a run of Sablon 2020 ethernet cable to my Taiko Extreme music server.
I normally power my router with an Uptone JS-2 power supply using good quality Uptone Audio DC cables. The QSA DC extension cable I have been using is terminated with a female 2.1mm terminaton on one end and a male 2.1mm termination on the other end. Because the JS-2 requires a 2.5mm input and the router requires the same 2.5mm input, I had to improvise with adapters and other DC cables. (I tried fitting the 2.1 terminations into the router and JS-2 and they would not work.)
The best sounding combination of cables and adapters looked like this:
JS-2 power supply (fed by a good quality Audience power cord but from non-dedicated circuits) > cheap 2.5 to 2.1 adapter > 12 inch run of high quality Zenwave Audio copper DC cable > QSA Lanedri Gamma Infinity DC cable > cheap 2.1 to 2.5 adapter > Greenwave router
Bear in mind that I had already experienced a very positive improvement from powering the router with the JS-2 using a good quality Uptone Audio DC cable. The QSA cable improved on the already excellent sound in the following ways:
- A significant step up in clarity
- Beautifully pure timbres and vibrant tonal colors
- Greater delineation of microdynamics
- Excellent PRAT
Vocals are more expressive because small inflections and microdynamics reveal artistic intent that I was unable to hear before. Lyrics are more intelligible. Percussion is very precise and legible. On well recorded piano, you can hear small variations in the amount of pressure being applied to individual keys, revealing (again) more of the artist’s intent. Bass is fast, tight, clean, and easy to follow. I heard no downsides including a lack of fatigue after hours and hours of listening. Emotional connection is better. Subjectively, I would say that the QSA cable doubles the impact of the JS-2 power supply.
Am I surprised that a DC cable is having these easily heard and fairly dramatic impacts on a non-audiophile router? Yes and no. Yes because, not that long ago, who would have even thought a router could have a profound impact on sound, let alone a DC cable feeding a router? No because, beginning last Spring, I have read and heard enough positive feedback from veteran audiophiles, and ears that I trust, who have reached the same conclusions when using a QSA DC cable with a router. In addition, I have been using a JS-2 power supply with a different router in a different system (see post #422 in this thread) and the use of a QSA Lanedri Gamma Revelation power cord on the JS-2 made a very positive impact. In fact, the impact of the QSA power cord on the router was greater than on a Sonore Optical Module.
I tried some other experiments. For example, I used the QSA DC cable with the cheap SMPS power supply that came with the router, eliminating the JS-2 from the equation. This sounded surprisingly good with various QSA attributes improving the sound: great clarity, transients, PRAT, bass, etc. Upon further listening, however, it became apparent that the combination of JS-2 and QSA DC cable was significantly better. Specifically, insertion of the JS-2 added tonal beauty, body, density, and refinement. On well-recorded piano and vocals (e.g., Patricia Barber’s “Higher”), the additional air surrounding the voice, the beautiful and delicate harmonics hanging in the air like you hear with a live piano, and the sheer realism of the voice all added up to magic. Subtract the JS-2 and the magic faded. So while the QSA DC cable will do amazing things even with an SMPS, a good quality power supply seems to help a lot.
Another experiment confirms the same basic idea that everything makes a difference. This time I substituted a cheap Amazon DC cable for the audiophile quality Zenwave DC cable that was part of the system described above. This time the sonic loss was not as great as when I substituted a cheap SMPS for the JS-2. But the loss could still be clearly heard: vocals were more realistic and were surrounded by more air with the better cable, and piano sounded richer and more beautiful.
Between power supply and Uptone EtherRegen:
I use an audiophile switch, an Uptone EtherRegen, between my router and my Taiko Extreme because it lets a little more detail through, adds some body, and just sounds a little more quiet and calm. Overall, it’s a fairly subtle improvement on most tracks but good value given the low cost of the EtherRegen. Of course a good power supply brings out more of the goodness and so I’ve been using a Farad Super 3 with the EtherRegen. I have been using the stock DC cable that Farad sells, so nothing fancy but decent quality.
I added the QSA DC extension cable to this setup so that the stock DC cable connected to the QSA cable which then connected directly to the EtherRegen. No adapters but still with the stock Farad DC cable in the chain.
I estimate that, as with the router, the addition of the QSA DC cable doubled the sonic improvement of the EtherRegen alone. I heard similar improvements: greater clarity; retrieval of low level details like decays and textures; vibrant colors and pure timbres; and seemingly darker backgrounds. Somehow this DC cable seems to be acting as a filter to reduce networking noise. Overall, the impact was not nearly as great as with the router simply because the router appears to be so vital to overall sound quality. If you were to only buy one QSA DC cable, I would suggest starting with your router.
Impact on video:
While others have described very significant impacts of the DC cable on their video systems, I saw and heard only modest improvements. I have achieved greater impact with an Audience power conditioner. I suspect part of the reason is that the AV system in my Seattle house is older and less responsive. I hope to try the DC cable in a better AV system in a different house and see what happens there.
In conclusion, the DC extension cable has had an outsize impact on my stereo system and has really increased my emotional connection with the music. At current prices, it is a stone cold bargain. And bear in mind that I achieved the greatest impact in my system using two cheap adapters and another run of DC cable. I imagine that a QSA DC cable terminated specifically for the components you already have would achieve even greater impact.