I am not sure I do, there are really so many variables in play. I am always interested in tinkering though because I enjoy it.You people hear the differences with filters? Really?
I am not sure I do, there are really so many variables in play. I am always interested in tinkering though because I enjoy it.You people hear the differences with filters? Really?
Between fastest and slowest/off some people might hear high frequency content loss.You people hear the differences with filters? Really?
Maybe you should try to connect the D90 directly to a power amplifier (not an integrated) and see if it is there. To me this sounds like som sort of grounding issue. And yes, TTs are often to blame, and ground issues works in mysterious ways. Tried XLR?I finally traced an annoying hiss/crackle to the D90 DAC. I am using RCA unbalanced out. As long as the DAC is plugged in, even if turned off, and even if using a different input on the amp, it creates some sort of interference hiss/crackle in the speakers. At first I thought this maybe normal low audible stuff you get, but it's worse. I switched power cables 3 times. No diff. I switched interconnects, and so on. Any other DAC using same cables, not there. Likewise, any other amp, it is there. I first noticed it when playing records, and thought it was a grounding issue on the TT. Because the DAC was off. Is there somehting that someone else has discovered? Has this been discussed? Thank you. The sound of it is superior I feel to several other comparable DACS I've tried so I'd like troubleshoot this and put it back in the game.
Hello ASR Community,
can someone of the D90 owners here tell me if the DAC is still in DSD Direct mode when DoP DSD is used?
Thanks for your help
OLED wears out. Set the screen brightness to Low and turn it off when not in use. An auto off screen mode would have been nice.Could the problem have developed because the DAC has been turned on for a very long time and therefor got to warm inside over a long time?
Try www.Apos.audioThanks.
I am from Denmark. I am now in NJ, USA. I have not received any response from the Topping dealers I have addressed in the USA.
@JohnYang1997
The HS01 product listing on Toppings website says it provides 1KVRMS isolation, does that functionality seem safe in such a small package? The Ikona 7054 Standard version rated at 1KVRMS is much larger, the 7055-B/C 5KVRMS devices are even larger.
The Ikona 7055-C offers 1KVDC isolation on USB 3.0 and 5KVRMS isolation on USB 2.0:
Ikona has a 1KV isolation device, not as small as the HS01 that offers similar features to the HS01, the Ikona 7054 Standard Version...USB 2.0 Hi-Speed Isolator
- Provides galvanic isolation to the USB bus
- Compliant to USB 3.0 (3.1 Gen 1) SuperSpeed (5 GBps) and 2.0 Hi-Speed (480 MBps)
- Backwards compatible to Full Speed and Low Speed
- 1kV DC Isolation of USB 3.0 part
- 5kV RMS Isolation of USB 2.0 part...
Standard Version 7054 1kV isolation, standard temperature grade, standard connectors Industrial Version 7054‑X 2.5kV RMS isolation, specified isolation working voltage, extended temperature grade, high retention connectors High Voltage Version 5kV RMS isolation: please refer to our new model 7055-B
The Ikona 7054 lists "Provides galvanic isolation to the USB bus" in it's feature list...but I don't see Galvanic Isolation mentioned on the Topping HS01 product page..
@JohnYang1997 if the HS01 provides galvanic isolation to the USB bus, the HS01 product page should list that specifically as a feature, as that is what many are after in a USB Isolator. What is missing in the HS01 implementation that didn't allow Galvanic Isolation to be explicitly claimed? Does the HS01 use Capacitive coupling?
The HS01 is pretty small, and gets a bit too warm in operation for my comfort level running 24/7, what kind of safety margin is there for a 1KVRMS rated device that small? I don't see 5V min/max/typical current draw specs in operation for the HS01, what are they? What were the design considerations to meet safety certifications in the US/World?
Update: I've asked Topping through Hifigo some questions via email, I'll post updates here and later in the thread too.
Update: 12/13 - From Topping through Hifigo => "We confirmed with Topping, it is not Galvanic."
Update: I considered an Ikona device before I found the updated ifi iDefender+, which I'd seen in it's earlier versions but never needed the functionality, until the D90 MQA / A90 combo. I might consider an Ikona in the future for myself, but for now I am happy with the noise free audio I already have with the ifi iDefender+ in place.
I did find these Ikona FAQ's interesting from Ikona on Sound, and Clicking the Buy on each product page gives more info on the versions I found helpful, 7054 or 7055 or
OLED brightness wears out over time. The longer that it is bright the faster it will get dim. If you set the brightness to low then it does not wear out as fast. My DX7 has the same problem after 5 years of use. But I turned it off many times when I was not using it to preserve the screenOn my Topping D90 the OLED has bright and weak segments.
Can I get it repaired, and if yes where?
Could the problem have developed because the DAC has been turned on for a very long time and therefor got to warm inside over a long time?
Isolators are also frequently used in industrial instrumentation. Its purpose is to eliminate interference and induced noise caused by potential differences that occur when connecting different devices.I asked the same question to Topping in August and received, "HS01 is a thorough galvanic isolator," also see here same question. They responded, "Truly galvanic isolated" (a few more answers too, fyi).
I finally traced an annoying hiss/crackle to the D90 DAC. I am using RCA unbalanced out. As long as the DAC is plugged in, even if turned off, and even if using a different input on the amp, it creates some sort of interference hiss/crackle in the speakers. At first I thought this maybe normal low audible stuff you get, but it's worse. I switched power cables 3 times. No diff. I switched interconnects, and so on. Any other DAC using same cables, not there. Likewise, any other amp, it is there. I first noticed it when playing records, and thought it was a grounding issue on the TT. Because the DAC was off. Is there somehting that someone else has discovered? Has this been discussed? Thank you. The sound of it is superior I feel to several other comparable DACS I've tried so I'd like troubleshoot this and put it back in the game.
This is typical gound loop problem. Not a particular issue with any one component. It is a system issue to do with how everything is grounded and connected together. Replacing RCA interconnect with balanced should fix it. Most likely your power line device was putting noise onto the mains wiring (that is how it works after all) which then coupled into the ground loop.Are you using a powerline adapter in the room? This happened to me when I switched brands of powerline adapters. Switched back and the hiss/crackle was gone. But not before tearing apart and rebuilding my whole system lol.
Weirdest thing is that the DAC and powerline adapter didn’t even share the same outlet.
All I could think is that the outlet for the powerline was attached to the computer which was then connected by USB to the D90. But yes on RCA the powerline adapter issue sent horrible occasional noise through my whole system. But like I said, swapped the adapter out and it was fine. So maybe it’s an issue with your coax through your house or certain adapters when this happens and the D90 can’t block it when unbalanced.