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HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 210

post #3136 of 3790

Here's an updated chart, it's part of my Headphone Network Calculator Spreadsheet:

 

post #3137 of 3790
Quote:
Originally Posted by robrob View Post
 

Here's an updated chart, it's part of my Headphone Network Calculator Spreadsheet:

 


Ah ha! Now thats just the amount of laziness I was looking for :D

 

Now, aside from having hopefully A LOT more play in the volume knob range when using the front mounted TRS jack, what might be a problem from attenuating an amplifier say 25dB or more? Anything? Or will it just be a reduced output level giving me the desired more play in the volume knob?

post #3138 of 3790
Quote:
Originally Posted by Sonido View Post


Well they told me 10k

I politely challenged Emotiva on this (after I crudely measured mine to be ~8k) and they did confirm that their measurements (made upon my request for clarification) as well as the schematics indicated 10k.  So, 10k it is, for sure.

post #3139 of 3790
Here some words about connecting the LCD-X to the speaker-jacks of a little tube amp using the Hifiman Adapter... Not an Emotiva and not an LCD-2 and as such a little off-topic, but maybe still interesting for some around here...
Edited by musikaladin - 2/5/14 at 8:09am
post #3140 of 3790

I installed my jack on the front, but after using a couple different braided/twisted wires, I am experiencing a ground loop issue which is pretty noticeable after 12 on the volume dial. When I unhook the front jack and go back to the external banana plugs the issue goes nearly away at all but the highest volumes. It seems the wire is picking up interference.

 

Will resistors help with this issue, can I simply install them on the back between terminals? (safety is not an issue) What size for HE-500? I am a novice at this stuff.

 

I won't be using the front jack until I can solve the issue, thanks guys.....


Edited by Grado77 - 2/7/14 at 4:00pm
post #3141 of 3790

The amp transformer is at the front part of the amp. The jack wires may be too close to it and picking up the transformer electrical magmatic field. If you can not move the wires any more I might try wiring with a metal braided shield. Twisting the jack wires all the way to the front may help.


Edited by john57 - 2/7/14 at 5:01pm
post #3142 of 3790

Use shielded cable such as mogami quad and try to keep the cable away to either far left or far right.

post #3143 of 3790

OK guys, I'll give that a go....thanks

post #3144 of 3790

Oh yea guys, go with the 220ohm 5W 1% inline resistors for attenuation! Listening levels are now around 12 o'clock on the volume knob.

post #3145 of 3790
Quote:
Originally Posted by ben_r_ View Post
 

Oh yea guys, go with the 220ohm 5W 1% inline resistors for attenuation! Listening levels are now around 12 o'clock on the volume knob.


Using resistors, is there any downside?... worse SQ? higher noise floor? Anything?

post #3146 of 3790

The main point of using resistors for me was to lower the noise floor. I am not sure if it affects the SQ. If it does, it's too subtle for me to notice. 

post #3147 of 3790

So...there's no reason not to then?

post #3148 of 3790
Quote:
Originally Posted by Nimzerz View Post
 


Using resistors, is there any downside?... worse SQ? higher noise floor? Anything?

Yea it actually LOWERS the noise floor and thats why people started doing it with this amp when using it to drive headphones. I also have an adapter cable made so that I can switch back and forth between the un-attenuated speaker terminals and my front mounted attenuated TRS jack and other than the huge difference in volume knob play and noise floor I cant tell any difference. Im planning on doing a DIY write up on the whole procedure but probably wont get to it for a couple weeks as Im still waiting for one last part to come in and its coming from China.

 

Quote:
Originally Posted by Nimzerz View Post
 

So...there's no reason not to then?

Pretty much none IMO.

post #3149 of 3790
Well no issues as long as you use planars.. With dynamics you can encounter problems with the damping factor etc.
post #3150 of 3790
Quote:
Originally Posted by davidsh View Post

Well no issues as long as you use planars.. With dynamics you can encounter problems with the damping factor etc.


Well yeah, that's what I figured.

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