Can I use DC03PRO between ibasso dx90 and Fiio A5? Can any improvement be expected?

Any one try a Ibasso DX90 + Fiio A5 + PS500? any recommendation for portable battery amplifier(without DAC) between DX90 and PS500? Thanks!

HD800 > HE500  >= HD600 >= DT800*600 > K701 > SR225 >> DT135 > HD497

You want to save me money ... :)

Looking opinion of the Grado club for the next Grado headphones.   Currently have SR225, HD600, K701, HE500 but I want to upgrade SR225 to  a higher level. Seek opinion about rs1 or higher model with emotion and relative fidelity.   Which model best would fit in my inventory mainly for...

1. HE500 2. HD600 3. K701   ex DT880*600   ex DT880*250 pro 4. SR225i 5. HD540 I *600   ex MS1 ex 6. Etymotics HF5 7. HD530 II 8. DT131  9. HD497 10. EAH - 810 11. KSC75 12. MX500

I must decide which of the two models to buy, and which of the two has a better quality sound. NFB-29 or NFB-1? I don't need pre-amp, headamp(NFB-29) or balanced output (NFB-1) ... only SQ has matters.   Other my chain is headphone amp Beta22 SE ----> unbalanced HE500, HD600, AKG701

Audio-GD NFB-1 (2015) review by Maarten van Druten   http://modelpromo.nl/Audio-GD_NFB1-2015.htm

Is there a possibility to change the digital filter set in ES9018? Some other unit has this setting, like audiolab Mdac.

I have a question about Audio GD NFB-10.2: Can a replace USB input(with newest USB-32 Chip ) to use DSD via USB (DoP) Is there a new firmware with support DSD DoP?   I think it is possible because wm8742 did supports but is applicable to Audio GD NFB-10.2

Any comments from people listened to both DAC's (Audiolab M-DAC vs. TEAC UD-501) are my helpful 90% I use FLAC 44*16bit via USB   Thanks in advance

Waiting for your opinion.  The choice NFB-1 or M-DAC or Teac UD501 to buy? How long does delivery to Europe ?

Both models are of interest to me.  Which of the two has better quality sound through USB?  DSD and 192khz do not matter to me, in this moment I use only unbalance connection with amp.   Thanks in advance

I can't understand why Kingwa  not use so popular XMOS for usb reciver?   Perhaps there is a reason, but this chip have in most modern DAC (wadia 121, yulong DA8, Anedio D2, ...and many more hi end) 

Hey guys   if MDAC, Wadia 121, Teac UD-501, YULONG D200(DA8), mytek stereo192 and Audio-GD NFB1 are the same price, which one(or two) would you choose for 80% USB 44/16 and 20% new experience in hi res audio?   Only the USB sound quality have matters. I love old(jazz rock) LP and CD records...

Can anyone who owns K701 and HD540 I to describe the differences and similarities?

I have a question. I already own a K701, DT880 * 600, HD600, MS1, HE500 Which headphones from serie HD540, HD560, HD540II and HD560II would represent something different and would attract my attention?   Don't tell me HD800, K812, T1, LCD3 .... :) Want just one old senn for $100 in my...