Is Nakamichi NDSK4085AU any good? Distortion measurements 

That’s what make the amplifier sound diferent from each other… but in the end, just like you said, good for the money. 👍

Powersupply of the computer may contaminate signal over USB, this could be helped with an galvanic isolator (like audioquest jitterbug). It would be really intressting comparing noice or jitter on optical vs coax vs usb (all digital formats). Thanks for an excelent video.

I currently run this Nakamichi DSP, compared to my brothers HiFonics M8-DSP (European Hifonincs). I do think the Hifonics is higher quality interms of SQ and distortion from adjustments on the parametric EQ's. If I try to make any adjustments greater then ±3dB the nakamich starts to induce "ringing". I have never used the internal amplifier and I figured it that it wouldn't work for me. I have a ATOTO android 7" touchscreen, and being able to download and use the Nakamichi DSP software and Bluetooth the DSP, tune it from the head unit is super convenient over the small screen on my phone. I have found that the Bluetooth seems to sound "cleaner" than the analog or USP input, I don't know if you testing methodology introduced erroneous result for the Bluetooth. I am still trying to figure out REW, so I can send you my measurements. We can see what the sound output looks like. I have been fairly satisfied with the DSP but have been planning to buy a Helix or Mini DSP in the future.

Thanks for video. What is max delay on channel you can adjust?100ms?I did watch your full video. A lot of harmionics will introduce resonant freq and may be difficult to find perfect eq settings. You would need to spend some time to find best settings. I have stock Bose amp in my car and another 2x amp at the back which one of is doing sub and another mids and highs. Unfortunately have delay between them.I worry if intruducing this or similarily priced DSP I will worsen the sound quality at the back of the car.

I'm curious on what a Dayton Audio DSP-408 measures.

How does this compare to the Dayton dsp408 though? Looks not great on its own, but is it better or worse than the 408 considering it's the only thing that's really price competitive (and is known to have noise floor issues)

When you're mentioning "analog input". are you talking about the high level input or the low level inputs?

Do a review on the alpine optim8 please. I want to know if the autotune is worth it.

I have a helix dsp.3 if you want to measure

Don't combine unlocked frequency and rectangular FFT window. Choose Hann etc.

Always compare noise floor and harmonics levels to your test tone's level. Their distance to it is their absolute level, not their distance to zero dBFs.

WIth 31BAND PEQ.whick EQ type i need to choice to eQ...keep it generic need other setup?

If it ain't raw; I say naw

The Honda will break down far less than the Ferrari. ;)

this pretty much explains that Nakamichi today is not the same company as 90s Nakamichi. it's no different quality than Chinese budget junk. sorry for the harsh word but i just disappointed such a well known brand went south like this. i rather get a second hand DSP at the same price