The Centrance HiFi M8 thread
Jul 4, 2020 at 8:14 AM Post #5,971 of 5,993

ExpatinJapan

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I'm looking for the output from the original version not V2.

First hit on Google :)

V1

D5E3235A-E89D-45DC-804C-1D454B144498.jpeg1EF351BB-7486-4F47-98C5-F5CFC304DD6C.jpeg
 
Jul 4, 2020 at 8:27 AM Post #5,972 of 5,993

Sefelt103

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Is it possible to calculate the output in mW at medium gain (single ended) for a 300ohm headphone from this ?
 
Jul 4, 2020 at 6:14 PM Post #5,973 of 5,993

HeadphoneAddict

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I'm looking for the output from the original version not V2.

Okay. I know from experience that the M8 V1 has plenty of power for my HE600/6XX/800. Going from memory years ago I recall someone saying it's around 75 mW max power into 300 ohms. I found a couple of good reviews below of the M8 V1, but Tyll Herstens at InnerFidelity didn't test past 150 ohms. His testing showed 600 mW into 32 ohm and 160 Mw into 150 ohm, with a output voltage of 5v (10 peak to peak). We know the M8 V1 is pretty strong when driving 300 ohm headphones. I don't know much about 600 ohm ones (Beyer Dynamic only?). See

https://www.innerfidelity.com/conte...n-centrance-hifi-m8-portable-headphone-ampdac
"THD+Noise vs. Output Vrms shows an amp with reasonably low distortion, but having very high output power and voltage capabilities."

https://www.cnet.com/news/raising-t...hifi-m8-digital-converterheadphone-amplifier/
"The HiFi-M8 is the best sounding all-in-one portable digital converter/headphone amp the Audiophiliac has ever tested... ...My high-impedance (250 ohms) Beyerdynamic T70 is another headphone that isn't at its best with phones or iPods, but the HiFi-M8 allowed them to really strut their stuff. The T70 can sound thin at home with some AC-powered headphone amps, but with the HiFi-M8 they sounded sweet! With the amp's bass boost switch in the mid position the T70 delivered remarkably solid, very deep bass. These headphones never sounded better."

Also, According to Tyll's measurements at http://www.innerfidelity.com/images/SennheiserHD600.pdf you need 0.230Vrms for 90dB = 102.7dB/1V. Likewise, you need 0.17mW for 90dB = 97.7dB/mW. So, the M8 V1 into a 300 ohm HD600 could hit over 121dB in volume. Note - the M8 V2 has double the voltage swing of the M8 V1.

EDIT - Lastly, the claimed 1.4W total in the V1 specs posted above was both channels driven, and Tyll measured 1.2W max total driven at 32 ohm.
 
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Oct 30, 2020 at 11:59 AM Post #5,976 of 5,993

Sefelt103

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Left is usb type B female (for PC) and right is optical (female). Centre is power off. The battery state should be indicated in left/right position (the same battery state). The optical cabe (male to male) should connect direct to a device with optical output or a dock with optical output. 3.5mm is for analogue and therefore won't work. The rear panels of Centrance only take digital/optical input and not analogue.
 
Oct 30, 2020 at 8:40 PM Post #5,977 of 5,993

goldgears55

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Left is usb type B female (for PC) and right is optical (female). Centre is power off. The battery state should be indicated in left/right position (the same battery state). The optical cabe (male to male) should connect direct to a device with optical output or a dock with optical output. 3.5mm is for analogue and therefore won't work. The rear panels of Centrance only take digital/optical input and not analogue.
Thanks a lot for your advice. But it’s still not work. Please see pictures below for the set up.
 

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Oct 31, 2020 at 1:46 AM Post #5,981 of 5,993

ExpatinJapan

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hifi- m8 versions

B72DA4D5-7690-4D94-BCCA-4A99B75EF901.jpeg

Usb-A version

E7B8E574-27DF-4C2D-A1CB-8412E00B955A.jpeg

optical version

note: on the front is a 3.5mm/ optical OUT port. Sendingsignal to headphones or into an amp, home system etc

8F6D70B2-4938-4A43-83F4-79D5BD9BEA34.jpeg

on the back is the optical IN

09185B20-0A43-4D0D-9ADE-D081C4BDE4E1.jpeg

computer to - usb cable - to one of the ports at the back - headphones out the front
....should work.
 
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Oct 31, 2020 at 2:11 AM Post #5,982 of 5,993

goldgears55

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hifi- m8 versions

B72DA4D5-7690-4D94-BCCA-4A99B75EF901.jpeg

Usb-A version

E7B8E574-27DF-4C2D-A1CB-8412E00B955A.jpeg

optical version

note: on the front is a 3.5mm/ optical OUT port. Sendingsignal to headphones or into an amp, home system etc

8F6D70B2-4938-4A43-83F4-79D5BD9BEA34.jpeg

on the back is the optical IN

09185B20-0A43-4D0D-9ADE-D081C4BDE4E1.jpeg

computer to - usb cable - to one of the ports at the back - headphones out the front
....should work.
Thanks a lot. That mean my version is not optical input(only optical output) as of 4XL version that is no optical port at the back.
 
Oct 31, 2020 at 10:35 AM Post #5,983 of 5,993

doctorjazz

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That usb in is difficult, what cable would work from a PC?
 
Oct 31, 2020 at 12:34 PM Post #5,985 of 5,993

doctorjazz

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Is that, ahem, audiophile enough...?
 

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