FIIO 2024 New Product Schedule-From FIIO James
Jun 4, 2024 at 5:08 AM Post #211 of 231
@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?
 
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Jun 4, 2024 at 5:20 AM Post #212 of 231
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 🤩
 
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Jun 4, 2024 at 5:45 PM Post #214 of 231
Hello, I just wanted to know the difference between the JA11 and the KA11? Are they both just 3.5mm dac amps?
IMG_3359.jpeg
 
Jun 4, 2024 at 10:28 PM Post #215 of 231
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? :pray:
 
Jun 11, 2024 at 10:19 PM Post #218 of 231
FiiO Stay updated on FiiO at their sponsor profile on Head-Fi.
 
https://www.facebook.com/FiiOAUDIO https://twitter.com/FiiO_official https://www.instagram.com/fiioofficial/ https://www.fiio.com support@fiio.com
Jun 11, 2024 at 10:28 PM Post #220 of 231
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 Stay updated on FiiO at their sponsor profile on Head-Fi.
 
https://www.facebook.com/FiiOAUDIO https://twitter.com/FiiO_official https://www.instagram.com/fiioofficial/ https://www.fiio.com support@fiio.com
Jun 11, 2024 at 10:34 PM Post #221 of 231
what is the earbud in this picture @FiiO?

GPsLBpUbwAEBlXv.jpeg
Dear friend,

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

Best regards
 
FiiO Stay updated on FiiO at their sponsor profile on Head-Fi.
 
https://www.facebook.com/FiiOAUDIO https://twitter.com/FiiO_official https://www.instagram.com/fiioofficial/ https://www.fiio.com support@fiio.com
Jun 12, 2024 at 4:31 AM Post #225 of 231

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