You may be mixing something up.
Yes , I mean that , sorry.
It should be "coil whine" alright.
Yes , in case switching frequency in DC/DC( or 50 ,60Hz in main transformer ) viberat the wire winding inside the coil , high end audio usually put a lot of details attention on just power supply transformer to make them silent best and most expensive method is vacuum epoxy potting, I buy myself these for my amplifier, https://sklep.toroidy.pl/en_US/p/TT...sformer-TSAS30VA-voltage-from-55-to-100-V/377.
What I meant was the so called coil whine is not necessarily coming from coil.
yes , you are right , it could come from ceramic capacitor or electrolyte capacitor too or even semiconductor too, I made amplifier with soft start that controlled by MCU (PIC16F1619 which has angular timer inbuild) and with triac, angular switching the main power , during soft start it buzzing in diodes in rectifier when it output filter capacitor ( around 4x82000uF ) get charged close to pick voltage , the reason showed to be after a lot of simulation in LTSpice that , during switching ( softstart duration only ) secondary side of transformer with combination of output capacitor make parallel resonance frequency ( buzzing sound ) . this buzzing in my case was not such issue because it is only during softstart, and when after softstart click out , the relay come and no more switching at main .
It can come from all components through which a power / signal flows, even resistors can whine.
I just want to say it's a little "cheap". You don't use a $900 DAC for a few weeks, several months. If you think every DAC has the same sound as much as the measurement is good, why do you buy D90SE? Why you don't buy SMSL Su-9 or Gustard x16 for only half price? You spend $400 for 2db SINAD that you can't hear it? Why does a DAC cost twice a different DAC with almost equivalent measurements and the structural components are also not better? Yes, high quality components do not make "measurements" better. High quality components will promise higher reliability over time. The problem I want to say here is durability, senior feeling. SINAD 123dB exceeds your hearing ability., and let's take several dBs for construction quality. The Sinad race should end here, focus more on the quality of construction and use experience. Be balanced everything, don't listen to music like the machines. Look at how Singxer, Gustard builds their products. Reliability is definitely higher.
Yes, they certainly know what they are doing.. But it is at the angle of manufacturer, they are beneficial. I am talking about consumers.
The SMPS we used are probably the highest quality ones among us.I just want to say it's a little "cheap". You don't use a $900 DAC for a few weeks, several months. If you think every DAC has the same sound as much as the measurement is good, why do you buy D90SE? Why you don't buy SMSL Su-9 or Gustard x16 for only half price? You spend $400 for 2db SINAD that you can't hear it? Why does a DAC cost twice a different DAC with almost equivalent measurements and the structural components are also not better? Yes, high quality components do not make "measurements" better. High quality components will promise higher reliability over time. The problem I want to say here is durability, senior feeling. SINAD 123dB exceeds your hearing ability., and let's take several dBs for construction quality. The Sinad race should end here, focus more on the quality of construction and use experience. Be balanced everything, don't listen to music like the machines. Look at how Singxer, Gustard builds their products. Reliability is definitely higher.
Yes, they certainly know what they are doing.. But it is at the angle of manufacturer, they are beneficial. I am talking about consumers.
If you only spend your money in a way: go ASR read the measurement and then go to Amazon order. OK simply don't think the same.
Sorry for my bad English.
Many users here forget that you not only pay for the components, but also for the entire development effort. With such a device, this is at least a medium 5-digit dollar amount to 6-digit.
Initially when I knew this site about 2 years ago, I saw Amirm want to search for cheap devices and have good measurements. With D90SE, it still has performance in the top class, but clearly the construction quality has come down. That is indisputable. With similar selling prices, component costs are much lower, this has made it no longer "cheap". I believe if they (Topping) want, they can completely make the next D70S with $650 and equivalent measurement performance or more.
Tell me what construction quality has come down? There's also D10 balanced that's probably the cheapest good performing balanced dac out there.
Dear John, I own a D70s from your company and it's a great DAC both about building hardware and sound. And when I saw the motherboard of D90SE, I was a little frustrated. Keep construction quality as D90, D70s, DX7Pro or DX3 Pro. Obviously what did well, don't improve anymore.
I think you understand what I'm saying.
No. Not at all.
At the manufacturer perspective, you definitely understand the cost of D90SE components compared to the D90. Still an old saying, what did well, don't need to improve.
While others say it's much better. It's a fact that it's actually much better by eliminating the capacitors if that's what you think it's better. The layout is done much nicer for best performance that you won't get without.
Do you have the right to look at the measurements and think it's good, why can't I see the quality of components?
Say it out what components. Please be straight forward. I'm not here to guess and waste my time.
