[Dept_of_Alchemy]

I know you're supposed to remove the jumpers if you're using the amp with low-impedance headphones, but what exactly do they do? Is it just a gain switch or does it somehow manage some sort of impedance matching?

 

[Duc]

I just changes the gain.

 

[vcoheda]

just gain.

jumpers in = high gain

jumpers out = low gain

 

[Dept_of_Alchemy]

Has anyone noticed SQ difference between the two gain settings? Theoretically low gain should have less distortion, right?

 

[Penchum]

Quote:

Originally Posted by Dept_of_Alchemy /img/forum/go_quote.gif Has anyone noticed SQ difference between the two gain settings? Theoretically low gain should have less distortion, right?

Well, I've tried both ways with different impedance headphones and have never noticed any kind of sound quality changes. I would guess that having the jumper set improperly, would create more distortion when running the amp at a high output. One thing is for sure, for a small amp, I love how mine works with my Senn HD-650s and HD-580s on high gain. Russian power tubes and Mullard driver tubes and it's ready to rock!

 

[Dept_of_Alchemy]

Quote:

Originally Posted by Penchum /img/forum/go_quote.gif Russian power tubes and Mullard driver tubes and it's ready to rock!

Yeah, it's amazing how much of an improvement tube rolling makes with the LDII++. I'm surprised this fact was not talked about more widely.