Hello,
I appreciate you guys help on my secondary DAC project. In my main DAC, I use a resistor I/V after the DAC on the legs of LL1527XL interstage transformers and followed by triode buffer. Now, on this "secondary" DAC, I want to achieve the maximum I can for listening to music on headphone (HD800). I've dropped the TPA6120 because I found my "old" modified CK2III is better for my taste. Now, with the JLSounds input you suggested, the DAC works well, but I'm struggling with the output. First, I've tried with an I/V resistor and parallel cap on the headphone amp input. It actually works very well, but, somehow cuts off the top. Even if I remove the 10n "low pass filter" cap it still cuts the very top. I need a buffer stage with low pass filter, but, without transformer and tubes. Should I just put an OPA627 with 47pF in the feedback like here ? https://www.diyaudio.com/community/threads/easydac-nos-r-2r-ad1862-dac-headphone-amp.312486/ , or, do you have other suggestion? My problem is, I do not like filters in feedback. Long time ago when I've used opamp based RIAAs, I've much preferred filters in the normal path, not in feedback (like the CODD RIAA, do you guys remember? 🙂 , also, I'm not sure about opamps. I understand nowdays with carefully selected opamps I can get better results than with bunch of transistors even I spend a day pairing them. So, OK, opamp, but really with feedback filtering?
What do you guys suggest?
Thanks a lot !!!!!
JG
(This subject is very important for me now. I'm in a situation that 5 days a week only this can feed me with music :-( and I'm starving for music, really. I know it is my fault, I sit down with my really excellent commercial audio interface and headphone, after 15 min the "ssss" hurts on vocals, the base is soft, weak and too much, the stage is foggy ... I know the DAC is the weak point in my chain. When I connect the headphone amp after my big DAC at home, I feel like "this is it", that is what I want. Or close. But these solutions I have now are pretty far. )
I appreciate you guys help on my secondary DAC project. In my main DAC, I use a resistor I/V after the DAC on the legs of LL1527XL interstage transformers and followed by triode buffer. Now, on this "secondary" DAC, I want to achieve the maximum I can for listening to music on headphone (HD800). I've dropped the TPA6120 because I found my "old" modified CK2III is better for my taste. Now, with the JLSounds input you suggested, the DAC works well, but I'm struggling with the output. First, I've tried with an I/V resistor and parallel cap on the headphone amp input. It actually works very well, but, somehow cuts off the top. Even if I remove the 10n "low pass filter" cap it still cuts the very top. I need a buffer stage with low pass filter, but, without transformer and tubes. Should I just put an OPA627 with 47pF in the feedback like here ? https://www.diyaudio.com/community/threads/easydac-nos-r-2r-ad1862-dac-headphone-amp.312486/ , or, do you have other suggestion? My problem is, I do not like filters in feedback. Long time ago when I've used opamp based RIAAs, I've much preferred filters in the normal path, not in feedback (like the CODD RIAA, do you guys remember? 🙂 , also, I'm not sure about opamps. I understand nowdays with carefully selected opamps I can get better results than with bunch of transistors even I spend a day pairing them. So, OK, opamp, but really with feedback filtering?
What do you guys suggest?
Thanks a lot !!!!!
JG
(This subject is very important for me now. I'm in a situation that 5 days a week only this can feed me with music :-( and I'm starving for music, really. I know it is my fault, I sit down with my really excellent commercial audio interface and headphone, after 15 min the "ssss" hurts on vocals, the base is soft, weak and too much, the stage is foggy ... I know the DAC is the weak point in my chain. When I connect the headphone amp after my big DAC at home, I feel like "this is it", that is what I want. Or close. But these solutions I have now are pretty far. )