Joined in 2023 
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63 About this deal
I wonder if this difference is mainly because of the tubes on the T9 Pro, or if the slightly different chipset (and their respective implementation), might play an important role too...
Keep the T9 POWERED. Then: a) Walk over to the T9 WITH your device; b) Take off the BT antenna and wait a few seconds; c) Hold the device close to the T9 and connect with the T9; d) when you see "connected" re-attach the antenna and enjoy! In general I like the sound of the T9 Pro more, although on tunes with a fair bit of "reverb" already in the original recording, it might feel a bit too much on the Aiyima and I'd prefer the Motu's flatter response. The reason for this is: without the antenna, the BT will have a poor reception distance, likely 3 ft at most. This will cut off other connected devices. By holding your device close you can achieve re-connection.When I connect the carousel to a Sony STR-DH790, there were no issues. The DH790 shows the connectivity info on the readout of C20C2./OC44.1kHz. Sony read the following optical output specs to me: I tried them all: USB from the computer, coax and RCA (separately) from an old Philips CD Player, optical from a LG TV and Bluetooth from my Android phone. HiFi clear sound with tone control: resonable circuit and concise wiring, adopts vacuum tubes to soften the sound and filter out the digital feelings, sounds warm and sweet without noise. Also with treble and bass knobs to adjust one's own preferable sound styles, presents HiFi music with rousing highs and deep lows. Since I don't have any passive speakers yet, I could only test the Aux Output, connected directly to the Presonus' RCA inputs. Issue #3 (gets HOT!): Another thing that surprised me was how HOT the T9 Pro became after a while (I guess those 11W need to go somewhere). The tubes are the first thing to warm up (but I guess that's expected from a tube), but the whole case gets pretty hot after a couple of hours turned on. I wouldn't say it's burning hot, but it's hot enough to feel a bit uncomfortable if you hold your fingers on top of it or on the sides for a few seconds.
This also shows the impressive range of the T9 BT. In my house, I can play my device from another room, and there are bends in the corridor.As a rule, don't forget to tell me what you use, and what do you think of the sound, and reservations if any! For TV optical out connection, it worked when optical out was set to auto. With my other/previous DACs, I always had to set it to PCM. Connect the rear power amplifier that needs external connection to the audio source output interface. In contrast to Round 1, this time I listened seriously for much longer, in the hope to find out more about the amp section.
Aiyima T9 Design At the heart of the T9 is the AC6926C Bluetooth chip, which besides BT conversion performs all control functions (volume, tone controls, selector and relay). Digital Inputs go through the MS8412. The 6K4 tube is basically a buffer (the Aux Out does go through it). Amplification functions are carried out by first the NE5532 and, of course TPA3221 chips. Source As I'm a classical fan I mainly use my low-end Chromebook to stream Naxos Music Library (courtesy of NYPL; described here). Here in China, especially with Jazz and Pop, I augment with Kuwo ( here) and sometimes Spotify (which requires VPN), streamed using my HP laptop running Windows (now 11). I never use my smartphones to stream. Let me remind you that I mostly stream now, but I do have some good CDs and a very good CDP (Sony), but that will not feature in Part I. With multiple digital audio inputs: Bluetooth 5.0 / USB / Coaxial / Optical / stereo RCA, compatible with most audio device such as phones, computers, tablets, TVs, TV, CD players etc. The perfect combination of DAC and amplifier, very suitale for audiophiles who have various audio devices. The Supporting Players Now, this is important. What I have here in China are very humble (by my standards), based on a set of more than 15 years old Chinese Sansui AV system (yes, the Japanese sold the name to the Chinese company, which is now a home appliance company) which I parceled out for 2 systems (main one, System 1, in my study, where I write for you; and the much less used auxiliary System 2 in the LR) There are a few extras that I had brought over from HK long ago, the most important being Revox and Sony. The stuff I use are detailed in my previous articles (Current iteration here, with links to earlier config). After some work they sounded pretty good. After listening to the systems for years I thought I knew them well, but what happened told me it was not quite so. Editor's Note 2/2/23:Readers may be interested in this Video of the Making of Aiyima T9 Pro. It shows in detail how an Aiyima product is made.A: When the unshielded signal line is unloaded, the interference signal will enter the power amplifier for amplification. It is recommended to replace it with shielded signal wire or unplug the signal wire. The Decision Yes, call me superficial. I immediately fell in love with the SEXY (VU) meter! But, unlike some of you, I'd not easily give in! :-) Certainly I have no need for another amp (or so I thought). While the almost universal digital connectivity appeals, what seals the deal for me was the AUX OUT. I wasn't sure whether it is Fixed or Variable, but as some users used it for subwoofer it should be a Variable out. It is, and more on this later. A Completely Different Business ModelWhy is the same product sold under many different names? Mr Liu’s friend’s factory OEM’s for a lot of people. Perhaps, and I’m not sure, some of them have small design changes, but...More importantly, from what I understand, these brands, Aiyima, Suca, Douk, Nobosound etc, compete as well as cooperate. Some would re-brand something without hesitation (same factory) and use their own sales base. This is pretty unthinkable in the West. Grant you, the products are similar (a testament to the very high level achieved with cheap digitals now) and, if you ask me, there is not much room for breakthrough. The USB of DAC A6 supports DSD512 decoding and PCM decoding from 16bit/44.1 kHz to IJ 32bit/768kHz, which is enough to cover the current mainstream formats and be compatible with higher format formats that may appear in the future. DAC A6 uses XMOS second-generation chip XU208 as the USB interface. With the special driver customized by SUCA (for Win7 or higher), A6 can better support high-resolution audio, especially DSD Native.
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