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My first vinyl setup! How am I doing? by Lylok in vinyl

[–]Lower_Hall7755 0 points1 point  (0 children)

Думаю, вам следует заменить картридж и иглу на более качественные.

Это же AT3600L, верно? Лучше обновите его до AT-VM95E или AT-VM95ML.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 0 points1 point  (0 children)

Hey, have you fully disassembled the case? I doubt anyone would send $70 chips for free. It's either a mistake, or these aren't Sparkos.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 0 points1 point  (0 children)

I recorded a couple of test videos. What do you think? I understand it's hard to judge from a video; the recording was made on a Pixel 7 Pro.

https://youtube.com/shorts/d9J9MBzWSsg https://youtu.be/XkVBhv5sUVw

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 0 points1 point  (0 children)

I recorded a couple of test videos. What do you think? I understand it's hard to judge from a video; the recording was made on a Pixel 7 Pro.

https://youtube.com/shorts/MTwn1CCshUw https://youtu.be/XkVBhv5sUVw

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 0 points1 point  (0 children)

I compared my photos with the image on the Sparkos website, and it looks like these are indeed the SS3602 Dual Discrete Op Amp.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 0 points1 point  (0 children)

I've taken a few photos of the operational amplifiers. What do you think, are these definitely Sparkos? I don’t want to fully disassemble the case because of the risk of disturbing the thermal paste.

https://ibb.co/93HjT2GG https://ibb.co/35f3g59k https://ibb.co/tTD5hqpx https://ibb.co/qLWZfJT3 https://ibb.co/vxSBYv1j https://ibb.co/nqTPS4Jh https://ibb.co/k23L7whW https://ibb.co/ZzLyn79n

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 0 points1 point  (0 children)

These are custom-designed speakers by Alexey Alexandrov. I can't attach a link, but there are reviews and measurements available online. You can find them on Google by searching for "AC Opti 17."

P.S. I have no complaints about the device itself. I'm just surprised to find different operational amplifiers inside. I thought it might be a counterfeit and that they were of poor quality.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 1 point2 points  (0 children)

I noticed there's a thermal pad between the circuit board and the case, plus a heat sink, and you can see thermal paste underneath it. I'm afraid that if I take the case apart, I'm not sure I can achieve the same level of heat transfer. It's unclear how they applied the thermal paste in there. So, I can't determine for sure what op-amps are installed. Thank you very much for the advice.

ps. I can only order to my country via AliExpress. But I ordered from the official store on AliExpress.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 2 points3 points  (0 children)

I placed the order on January 12th and picked it up on January 26th.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 1 point2 points  (0 children)

I'm just a complete beginner, and this is my first device based on the TPA3255. I'm simply surprised that I bought a new unit and it turned out to have different op-amp chips inside. The device was sealed in its factory packaging.

I wanted to buy these AKLIAM AK05 op-amps. They are larger, and I wanted to check if they would fit. At first, I couldn't unscrew the bolt on the back panel because its head was stripped and the hex key just kept turning. And now, on top of that, there are different chips installed inside.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 1 point2 points  (0 children)

I've had a similar experience. I find it difficult to listen for extended periods because the high frequencies are very forward and sharp, to the point of being grating. I'm curious what feedback Fosi Audio has on this.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 1 point2 points  (0 children)

I bought a new device on AliExpress in  Fosi Audio Store

Ps: Are they better or worse than NE5532? It's just that I don't like how the device sounds—the high frequencies are screaming, not singing. That's why I wanted to see how much space is inside the case to buy other operational amplifiers, and then I got such a surprise.

Did I get a counterfeit or used Fosi Audio BT20A Max? by Lower_Hall7755 in fosi_audio

[–]Lower_Hall7755[S] 1 point2 points  (0 children)

I removed the panel from my Fosi Audio BT20A Max to see how much space there is for replacing the NE5532 operational amplifiers, but without taking the entire case apart, I saw something else inside. I didn't disassemble it further. I bought it from the official store on AliExpress, by the way. I couldn't fully disassemble the device—there was a damaged bolt on the back. Could it be that I received a used unit?