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A mono amp has for multichannel applications its advantages, or how would you power the 3-channel front arrangement (L,C,R etc.) ? This is one of the many advantages a single channel (mono) may have...

This really calls into question the validity of the originator's name "Scientific Audiophile"...

Just wondering, why the max balanced output as tested by @amirm is only half of what Fosi Audio claimes for the SK02 ?

Because it is "fixed" it will work "spmehow" as intended just for low volumes. At higher volumes it is not useful because of the fixed adjustment. Thus it is not that useful and has to be disengaged manually then...

"Loudness" describes indirectly the sensitivity of the human ear to the effects of different frequencies and sound pressures. The ears stays at medium frequencies with the highest sensitivity and looses this to the bass and (less) to the higher frquencies. depending on the sound pressure Your...

Ridiculous prices even for simple things...

A DSP / Advanced EQ plus tone controls should be onboard, because the room and/or headphone(s) need (usually) both.

:facepalm:

Why so aggressive ? I just wondered, why they have chosen an "old" chip for a brand new headphone amp design, if the "old" chip has already a successor ?

They "look" almost the same, but it's a desktop design, asked by many with somewhat different (and improved) functionallity depending on the individual use case... Its not defined for mobile application as the "old" SK01 is, which I already got.

Strange. If I interpret your exerpt from the spec sheet correctly, most of the data seen here have been improved (impedance of the DAC) and some improvements from the spec sheet of the successor have not even been listed by you: i.e. the DAC has changed from HyperStream® II DAC to HyperStream®...

The newer chip has better specs, which might make it sound "better" :cool:

Fosi Audio just announced a new headphone / preamp (desktop) amp, SK02, supposed to be even "better" than the SK01, which will be available end of February 2024 at somewhat higher cost. Power supply seems to be through an USB-C port. Analog and digital inputs are available...

Today Fosi Audio annouced a new headphone amp, the SK02, a desktop unit in almost the same (?) layout, available end of February 2024. it is supposed to be their "prime" headphone amp right now. Just wondered, why they used an outdated chip in this new unit, the ESS ES9038Q2M, which has a...

Same attitude here. Why would Aoshida keep a firmware "secret", resolving a known behavioral bug... ?

have You got a link to the changed firmware ?

Prices fluctuate a bit, because they have to establish a higher price point to be able to rabate a bit from there...

Audyssey XT32 will not connect or disconnect a subwoofer, because it will just play the system with its corresponding corrections like it found it during the measurements. It will not "force" a recalibration either. Every action is up to the user...

Steadily declining whilst getting older :-)

Who has several speakers as stated at hand ? Speaker sound is mostly room and placement dependant, meaning, that a user should audition the sound under his individual and personal circumstances... A speaker may thus sound in one room "great" but seem to lack in another...