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HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 192

post #2866 of 3790
Quote:
Originally Posted by Nimzerz View Post
 

Would you guys think the Aune T1 would sound good as a DAC, then fed to the Emotiva which will power my HE-500? Or would the Modi also beat this DAC?


First post for a long time lurker.  After reading what was this entire thread earlier this month, I went out and bought the Emotiva a-100.  I was running the Aune T1 (with a Genelex Gold Lion 6922) into a Magni.  I used Robrob's suggestion to connect the female end of a headphone extension to the speaker taps (red wire to left positive, white wire to right positive and remaining wire to one of the negatives using banana plugs).  Difference is huge.  My HE-500s now sing compared with the old set-up.  I do get a somewhat annoying hum (that I didn't get with the old set-up) during quiet passages in the music. I also get this hum with my Dragonfly DAC, so I don't think it is just the Aune.

 

I use JRiver 19 and find that system volume around 75% works best with the Emotiva volume.

 

Anyway, many thanks to Malveaux, Robrob and others for their helpful contributions to this thread.  Any suggestions to get rid of the hum without hurting the SQ are appreciated.  I can live with it, but, heck, I'd rather have my cake and eat it too. 

 

Toshiba w/JRiver19 > Ifi USB Power > Aune T1 > Emotiva a100 > HE- 500

post #2867 of 3790
Quote:
Originally Posted by kas49 View Post


First post for a long time lurker.  After reading what was this entire thread earlier this month, I went out and bought the Emotiva a-100.  I was running the Aune T1 (with a Genelex Gold Lion 6922) into a Magni.  I used Robrob's suggestion to connect the female end of a headphone extension to the speaker taps (red wire to left positive, white wire to right positive and remaining wire to one of the negatives using banana plugs).  Difference is huge.  My HE-500s now sing compared with the old set-up.  I do get a somewhat annoying hum (that I didn't get with the old set-up) during quiet passages in the music. I also get this hum with my Dragonfly DAC, so I don't think it is just the Aune.

I use JRiver 19 and find that system volume around 75% works best with the Emotiva volume.

Anyway, many thanks to Malveaux, Robrob and others for their helpful contributions to this thread.  Any suggestions to get rid of the hum without hurting the SQ are appreciated.  I can live with it, but, heck, I'd rather have my cake and eat it too. 

Toshiba w/JRiver19 > Ifi USB Power > Aune T1 > Emotiva a100 > HE- 500
Have you been able to compare the aune t1 to other dacs in this setup? And congratulations on your first post smily_headphones1.gif
post #2868 of 3790
Quote:
Originally Posted by Nimzerz View Post


Have you been able to compare the aune t1 to other dacs in this setup? And congratulations on your first post smily_headphones1.gif


Only the Dragonfly, but in my opinion, Aune comes out way ahead in terms of providing musical enjoyment when combined with the Emotiva.

post #2869 of 3790
Ok well if anyone here has access to the hrt ms2 could you try it with this setup and let me know how it sounds?
post #2870 of 3790
Quote:
 Any suggestions to get rid of the hum without hurting the SQ are appreciated.  I can live with it, but, heck, I'd rather have my cake and eat it too. 

 

kas, since the Emotiva solid state amps don't really need matching speaker load you can get away with just running a resistor in series on the + wires to give you some attenuation and drop the noise floor and hopefully hum. On the hum issue, do you have everything plugged into the same power receptacle or extension? Doing that will minimize the chance of developing ground loop hum. But back to the attenuation resistor, if you add a 40 ohm 5 watt resistor to both + lines you'll get 6 dB of attenuation which should be enough to effectively decrease the amp gain and drop the noise floor. 70 ohms would give you 9 dB of attenuation, and 110 would give you 12 dB..

post #2871 of 3790
Quote:
Originally Posted by robrob View Post
 

 

kas, since the Emotiva solid state amps don't really need matching speaker load you can get away with just running a resistor in series on the + wires to give you some attenuation and drop the noise floor and hopefully hum. On the hum issue, do you have everything plugged into the same power receptacle or extension? Doing that will minimize the chance of developing ground loop hum. But back to the attenuation resistor, if you add a 40 ohm 5 watt resistor to both + lines you'll get 6 dB of attenuation which should be enough to effectively decrease the amp gain and drop the noise floor. 70 ohms would give you 9 dB of attenuation, and 110 would give you 12 dB..


Thanks again robrob.  Everything is plugged into the same power strip.  I will look into adding a resistor. 

post #2872 of 3790

My current setup is an Essence ST RCA>Emotiva USP-1>Emotiva A100>Beyer DT990 Pro 205ohm. Just using a banana plugs to Female TRS taps cable I made. Sounds lovely, both the amp and preamp are very very clean sounding. You may ask why I'm running the preamp in front of the MiniX, the USP-1's have a full range output and bass management style 2.1 output(which I use to drive to speaker/sub amps), it also allows me to route not just my PC, but also CD/SACD, vinyl, and tape to my A100 when I want to listen on headphones and not have to unplug anything.

post #2873 of 3790

Here's some common resistor values to reach a desired level of attenuation:

 

The above table has been corrected. It originally showed resistor pair 5 and 2 giving 7.7 ohms of speaker load and 9dB attenuation. The correct resistor values are 5 and 3 as shown above.


Edited by robrob - 12/22/13 at 4:32am
post #2874 of 3790
Quote:
Originally Posted by robrob View Post
 

Here's some common resistor values to reach a desired level of attenuation:

 

Headphone_Network_Common_Values.jpg


Nice! It would be also nice to include how much % of the wattage the headphone is expected to receive for the preferred network, which is around 8 ohm speaker load, and amps have listed wattages at that resistance. Some headphones such as the HE-500 requires a certain wattage to sound good. I think I calculated the bolded line out to be 3.8% for the HE-500 (38 ohms), so it was 1.9W from the MiniX.

 

Also, do you think adding resistors reduces the damping factor significantly enough to be audible?


Edited by Sonido - 12/21/13 at 12:08pm
post #2875 of 3790
Quote:
Originally Posted by Sonido View Post
 


Nice! It would be also nice to include how much % of the wattage the headphone is expected to receive for the preferred network, which is around 8 ohm speaker load, and amps have listed wattages at that resistance. Some headphones such as the HE-500 requires a certain wattage to sound good. I think I calculated the bolded line out to be 3.8% for the HE-500 (38 ohms), so it was 1.9W from the MiniX.

 

Also, do you think adding resistors reduces the damping significantly enough to be audible?

Good suggestion. I'll look into adding the % at 8ohms calculation.

 

Sorry, I can't answer your damping question.

post #2876 of 3790
Thank you robrob!

Btw I got some audiovector series c floor standers. They are quite nice
post #2877 of 3790
Damping factor shouldn't matter with orthos at least.
post #2878 of 3790
Quote:
Originally Posted by robrob View Post
 

Here's some common resistor values to reach a desired level of attenuation:

 

Headphone_Network_Common_Values.jpg

Robrob, how can deduce 7.7 ohm of resitance with a 5 and 2 ohm resistor. That is just off. I find it to be around 6.8-6.9 ohms.

post #2879 of 3790

Good catch David. It was a simple transcription error on my part. The resistor values should be 5 and 3. It's been corrected in the spreadsheet calculators and in all of the posts above. Corrected chart:


Edited by robrob - 12/22/13 at 4:43am
post #2880 of 3790

That's better.. Now the question is whether to go with 6-2 or 5-3. Hmm... 12 dB seems like a lot, yet if an amp is really noisy it might be necessary.. I have thought about making your v3 box with resistor values of 5 and 4 and then adding yet another parallel network for a mini-jack for further attenuation. That'd be quite neat, enabling most speaker amps to drive about any headphone.

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