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I am so glad to see Fosi listened and redesigned on the thermal management, I hint on my TB10D review to use the casing and they literally did it and the Budget Audio Labs review result speaks itself!

The links of picture are broken, and I have no way to edit the original post...

unless you mean USB in for mic, no it doesn't have that . However it does have USB audio function. The usb-c for power serves as USB audio as well, up to 96khz.

Fosi Audio K5 Pro teardown and review The packaging comes with optical, USB-C/A cable, 3.5mm jack splitter for mic and headphone. The DAC is well built just like other Fosi products, solid gunmetal aluminium enclosure. Front: All the aluminium knobs feel high quality. The tone controls have a...

Fosi Audio TB10D teardown and review The packaging: Front: Back: Teardown: TPA3255 chip under the heatsink: Thermography on dummy loads (4ohm): Heat issue: One thing that is not often discussed regarding mini class-D amps is thermal management. I was planning to delve further into...

When designing an audio amplifier, it is generally recommended to use a volume potentiometer with a logarithmic (also known as audio taper or type A) taper. This is because the human ear has a logarithmic response to sound pressure level, so using a logarithmic taper potentiometer allows the...

This might also be the reason of crossover that is not linear and hard to tune.

https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-bt30d-pro-review.39706/

Use a quality double throw switch in front, OFF, RCA, BT.

That’s correct, yes the full range preout can be used to connect an active sub, then adjust the low pass on the sub itself.

The row components are inductors (chokes) Typically used for output filtering

I took it apart :) https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-bt30d-pro-review.39706/

Which Dirac target curves y'all use to boost the bass a bit? It seems I lost a lot of bass with stereo music after Dirac tuning;

Compared to the BT30D non-Pro (left), the Pro version is quite a bit longer and heavier (430g vs 620g). The knobs are made of aluminium, different texture compared to the no-pro, a bit more resistance to turn. Same throw switch used to power on. The 3.5mm PRE OUT is full range. Bluetooth...

The speaker outputs are full range. When I wrote crossover frequency in the review, I really meant the low pass frequency for the sub. Crossover wasnt the right wording

Fairly simple packaging box with generous foam protection all around The DAC/Amplifier got some weight for its size. I was surprised when I picked up the package. It has a rigid all aluminium enclosure with pretty thick walls. This unit is built like a tank, trust me. Maybe a bit overkill but...