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Gain settings for O2 amp+ODAC?

post #1 of 6
Thread Starter 

Hey everyone :beyersmile:

 

I can't quite get my head around what gain is and what it means. I'm planning to buy an O2 amp with an ODAC built in.

 

Also, I use a set of Creative T40 Series II desktop speakers and plug my Beyerdynamic DT 990 Pro(250 ohms) into the speakers.

 

Now, I'm planning to purchase my unit over ebay from a guy in Spain, since I live in Denmark(both countries are within the EU) so there will be no customs fees, import taxes etc.

This guy is buying the parts and putting the unit together himself and he notes that the amp comes with 2.5x & 6.5x gain by default and that he can change this to anything the customer wants.

 

My question to you clever people is of course: Do I want other gains settings? And does it even matter when the Creative speakers are plugged in between the headphones and the unit? Do I need to throw the speakers out the window and use the unit solely with the headphones?

 

Thanks! :D

post #2 of 6

Think of the gain as a volume offset to make the volume control more useful. High gain is useful so you can get good volume out of hard to drive headphones without having to turn the volume dial to max, but sensitive headphones will want lower gain so you can actually move the volume dial without your ears exploding.

post #3 of 6
Don't plug the computer speakers into the amp - that's a waste of a good DAC and amp. Plug your headphones into the O2.
post #4 of 6
Thread Starter 
Quote:
Originally Posted by billybob_jcv View Post

Don't plug the computer speakers into the amp - that's a waste of a good DAC and amp. Plug your headphones into the O2.

But does it negatively affect the amp and DAC if I the speakers are used a link between the amp and DAC and the headphones?

 

Quote:
Originally Posted by kraken2109 View Post
 

Think of the gain as a volume offset to make the volume control more useful. High gain is useful so you can get good volume out of hard to drive headphones without having to turn the volume dial to max, but sensitive headphones will want lower gain so you can actually move the volume dial without your ears exploding.

So would the 2.5x and 6.5x gain options suffice for my DT 990 Pro?

post #5 of 6

The amp is designed for headphones, I wouldn't try and plug speakers into it. You then lose most of the advantages of having the amp if your headphones are plugged into the speakers.

 

Having never used the DT990s I can't comment on an appropriate gain setting. I'm sure headfi has large threads for both the amp and those headphones, you'd get a better response posting in them.

post #6 of 6
It won't hurt the DAC and amp to have powered speakers plugged-in to the O2 - There's just no reason to do it. If that's how you want to hook this up, then don't bother getting the O2 & ODAC.
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