[spectrum48k]

@FiiO
Fiio M25 request:
1. AK4191+AK4499EX audio chipset
2. Power source: double battery each for +12V and -12V for output stage (biased with low impedance tantalum-polymer caps battery). +12 and -12V should be equaled during discharge because will by supplied non-symmetrically from +-12 to +-8 during discharge. (Reason: no additional step-up converter). P.S. Also could be used unipolar 12V only due to p.5 principle.
3. Use totl and fast rail-to-rail op-amps for i/v, filter and buffer (ADA4898-2, OPA2156, Muses8920 etc). Do not use anemic datasheet copied OPA1612 for i/v. Consider capacity, load, psrr, cmrr compliance. (Reason: get attractive, non-ordinary and dynamic tuning). Try to short number of op-amps (i/v with filter, passive filter with fkp caps, output buffer hi-freq stabilising)
4. Do not use that hi-impedance and lo-performance combo: OPA926+TPA6120 combo for output. Be original! Use 2-in-parallel (8 in total) thermal-padded VSON version of BUF634A without adding of series resistors (you could find examples for parallel usage without series resistors from TI). Reason: get 500 mA output current in power-effective portable mode and low output impedance. (BW (dynamic) selection in addition to gain selection?)
5. Conduct that 4 independent L+L-R+R- circuits directly to balanced output (so ri-ro op-amps make rule). Should be ther summator to use 3.5 output? Not sure. I decided to do not use it since 2024 with my low-impedance AMT-IEM.
6. Use mechanic mute-relay instead of solid one (no distortions, less additional impedance, hi-load)
7. Mechanical logarythmic and highly symmetrical volume control? Will be bonus... (then should be ~3 stage gain-selection)

Will be it only my dream?

 

[Ben86]

Fiio M25 request:
1. AK4191+AK4499EX audio chipset
2. Power source: double battery each for +12V and -12V for output stage (biased with low impedance tantalum-polymer caps battery). +12 and -12V should be equaled during discharge because will by supplied non-symmetrically from +-12 to +-8 during discharge. (Reason: no additional step-up converter). P.S. Also could be used unipolar 12V only due to p.5 principle.
3. Use totl and fast rail-to-rail op-amps for i/v, filter and buffer (ADA4898-2, OPA2156, Muses8920 etc). Do not use anemic datasheet copied OPA1612 for i/v. Consider capacity, load, psrr, cmrr compliance. (Reason: get attractive, non-ordinary and dynamic tuning). Try to short number of op-amps (i/v with filter, passive filter with fkp caps, output buffer hi-freq stabilising)
4. Do not use that hi-impedance and lo-performance combo: OPA926+TPA6120 combo for output. Be original! Use 2-in-parallel (8 in total) thermal-padded VSON version of BUF634A without adding of series resistors (you could find examples for parallel usage without series resistors from TI). Reason: get 500 mA output current in power-effective portable mode and low output impedance. (BW (dynamic) selection in addition to gain selection?)
5. Conduct that 4 independent L+L-R+R- circuits directly to balanced output (so ri-ro op-amps make rule). Should be ther summator to use 3.5 output? Not sure. I decided to do not use it since 2024 with my low-impedance AMT-IEM.
6. Use mechanic mute-relay instead of solid one (no distortions, less additional impedance, hi-load)
7. Mechanical logarythmic and highly symmetrical volume control? Will be bonus... (then should be ~3 stage gain-selection)

Will be it only my dream?

M25??? I think it meant to be M27 (M17 successor).

The only thing that I want for it - is a user easy accessable and replacable battery option. The best I can dream is two 18650 Samsung/LG batteries that can be easy accessed, removed and replaced by the user, or at least a Li-ion accumulator like in the new ibasso daps. Full metal case with metal back cover and two 9039Pro or four 4499EX

 

[Drakester]

M27 sharing some of the internals of the K19 would be great, I guess that will be kind of expected given the price point and the current M17 vs K9 Pro ESS.

 

[Killedkella]

Hello, I just wanted to know the difference between the JA11 and the KA11? Are they both just 3.5mm dac amps?

 

[XERO1]

Hello, I just wanted to know the difference between the JA11 and the KA11? Are they both just 3.5mm dac amps?

Is there also a Lightning version of the JA11?

 

[C4PPY]

Any more news on the updated UWTS5?

 

[Nabillion_786]

How long till we can order the FD15 in the UK?

 

[FiiO]

Hello, I just wanted to know the difference between the JA11 and the KA11? Are they both just 3.5mm dac amps?

Dear friend,

Hi, yes, both of them are 3.5mm USB dongle. The output power of JA11 will be smaller than the KA11. For more information about JA11 and KA11, you could follow this thread: https://www.head-fi.org/threads/fii...mplifier-discussion-impressions-thread.962861

Best regards

 

[lordearl]

what is the earbud in this picture @FiiO?

 

[FiiO]

How long till we can order the FD15 in the UK?

Dear friend,

Hi, thank you for your interest. If everything goes well, it will be available in UK market in the end of this month.

Best regards

 

[FiiO]

what is the earbud in this picture @FiiO?

Dear friend,

Hi, thanks for your interest. This earbud hasn't been released yet. It is JadeAudio JF11.

Best regards

 

[FiiO]

Is there also a Lightning version of the JA11?

Dear friend,

Hi, may not. You could consider KA11 instead.

Best regards

 

[lordearl]

Dear friend,

Hi, thanks for your interest. This earbud hasn't been released yet. It is JadeAudio JF11.

Best regards

Exciting - another earbud, at long last. What's the release date?

 

[Nabillion_786]

Dear friend,

Hi, thank you for your interest. If everything goes well, it will be available in UK market in the end of this month.

Best regards

Thanks soo much for your reply and last thing, do you know the rough price of the fd15 aswell?

 

[superuser1]

Thanks soo much for your reply and last thing, do you know the rough price of the fd15 aswell?

Around $150