Uhm I didn't really personally like any of those on headphones. 797 does well in my DAC's IV stage but not so well in my headphone amp. 637bp I haven't tried but read and heard 627bp is better. 602AP I don't know. and original 2134AP is ok but nothing to write home about. I would look for...

Opamps that I found very suitable for most of my headphones were opa2111vm (or dual 111vm) opa627bm Burson V6 (discrete) and Sparkos SS3602 (also discrete) The Burson V6 is a very good opamp for it's price. And you can have a vivid and a classic to roll for different music styles / headphones...

Sorry I got confused!

You have just bought it ? But they just also brought out a new version with ak4493 chip. I wonder why you have chosen ak4490 and not the new design. Discount ? The ak4493 is the improved version of the ak4490 borrowing features from the more expensive ak4497

DX3 Pro is an amazing device after you do a few mods if you can! I've done a few "simple" mods and the device got a serious league upgrade. It outperforms my highly tuned LKS ES9018 easily. The ES9018 uses only high-end components and CCS on I/V stage. The AK4493 has better detail, better...

I have three units. Combine it with a 1.5A PSU and no problems whatsoever

Popped in a Burson V6 vivid.. Felt like the sound quality improved by about 15 over OPA627BM and OPA111VM.. Couldn't believe my ears.. Then a bit later I got a Sparkoslabs SS3602 discrete opamp.. and another 5-10% improvement over the Burson V6 to my ears... and then I rolled back to dual...

Here a photo of the damage I had done to the socket when I accidentally pulled the dip8 convertor off... being tired and impatient.. I send the board to my friend that will tinker with it and can probably fix the opamp socket by pulling wires straight from the resistor positions. I ordered...

Agree with you. I asked topping for schematics but don't think I'll have much luck with that. For now the most simple mod I can do is rolling the opamp for a discrete one to refine everything a bit. Let's be clear about my intentions here. Seeing how I already threw about 4000 RMB (€500) in...

So far the mod cost me €80 for the discrete opamp and €100 for a new board and some loose components. I can't really advice it to anyone price effectively! But I've already gone through most of it so let's finish it and report back if it's worth it or not! Puzzle Best option for low...

New board on the way from the Topping factory. I contacted them from their official Taobao shop and the board should be in the day after tomorrow. I also ordered a brand new original unit to compare with. The replacement board I will continue modding but the original unit I'll keep original and...

I broke my board with trying to solder the sop8 to dip8 adapter on. The plating on the board came off and it's too small for me to fix. So I ruined a perfectly good device. Ordered a new one to do another surgery on. I still believe in the mod. I might ask some help of my friend who's better at...

That is exactly what I thought of the comparison with my LKS 9018 and the DX3 Pro. I did feel the ES9018 was doing a bit better job at my Mad Dogs and Aeon giving it a bit more sparkle and soundstage. but for my studio monitors I'd pick the DX3 Pro any day any time.

It's more like hobby than that it makes sense haha. The OPA1612A is already a really good opamp. I am guessing the improvement will be marginal but audible. I'm hoping to open up the soundstage a bit more. From what I've read the Sparkos discrete opamp is practically the best there is. And since...

I'm going to embark on a mission. Since I really love the sound of the DAC but admit there is some room for improvement regarding widening the soundstage a bit and making the sound a little more spacious I have decided to solder out the OPA 1612 which is a very neutral and clean sounding opamp...

Yes, do test again with the LPS in place. You might be surprised. Apart from that. I do know what you mean by the DX3 Pro having a more centered sound and more pronounced vocals. I like listening to female vocals so clearly this has it's benefits. Also I pair it with a Lehman with Burson V6...

I did experience a burn in time with the DX3 Pro where it started off real strong and then got a bit dull and flat for quite some hours. After which it opened up again. I never am a big believer for burning in DACs or headphone amps... (Headphones and speakers with mechanical parts I do believe...

That's pretty good news! I thought the D50 might have a better DAC circuit.. So I was tempting to buy it and test it against the DX3 Pro but seems there is no need for that haha. So far I don't really use the Headphones out since I have my Lehman with Burson V6 hanging behind it to drive my...

Wow that would be amazing!

I have no clue what you are talking about. Its standard supply is 15V/1A.. Maybe read the specsheet ?