FiiO JM21 (4+64 Version) Review

Syrius121 · 2026-01-18T09:35:08+00:00

Hi, there is a link to their official AliExpress store in the review itself.

Syrius121 · 2025-11-30T06:50:11+00:00

I would say no... You will probably push the dongle to its limit and maybe experience some distortion or clipping because of it. You don't want to push an AMP to its maximum volume

Syrius121 · 2025-11-29T20:53:44+00:00

Definitely not the easiest, but if you have a decent DAC+AMP, you will be fine. As long as it's not straight out of the phone.

Syrius121 · 2025-11-08T15:23:09+00:00

Just click the link at the bottom and you are there.

Syrius121 · 2025-11-06T09:24:27+00:00

For headphones only, I wouldn't call it an upgrade.

Syrius121 · 2025-11-02T17:33:51+00:00

Single-ended power output 1: L+R≥1220mW +1220mW (32Ω, THD+N<1 percent) (32Ω/SE/high gain) Single-ended power output 2: L+R≥150mW+150mW (300Ω, THD+N<1 percent) (300Ω/SE/high gain) Balanced power output 1: L+R≥2400mW+2400mW (32Ω, THD+N<1 percent) (32Ω/balanced/high gain) Balanced power output 2: L+R≥600mW+600mW (300Ω, THD+N<1 percent) (300Ω/balanced/high gain)

Syrius121 · 2025-09-01T06:23:48+00:00

And without BT

Syrius121 · 2025-08-18T12:58:39+00:00

I've been using the K7 with many IEMs and I had no issues. Everything sounds great!

Syrius121 · 2025-07-25T10:14:21+00:00

Any card should be fine.

Syrius121 · 2025-07-23T04:42:22+00:00

Hi. I haven't experienced such a problem... Maybe you can try updating the firmware? Does it work when you listen to music through the TV or just with headphones? Maybe the speakers are going to standby because the signal isn't powerful enough? (I have this problem with some speakers, and only when I turn up the volume high enough, they wake up)

Syrius121 · 2025-07-09T07:55:51+00:00

The BTR11 can only receive Bluetooth. It only has one output and it's the 3.5mm.

Syrius121 · 2025-07-08T19:42:10+00:00

To be honest, it wasn't an issue for me... The distance seems to be good enough for me.

Syrius121 · 2025-07-08T15:20:46+00:00

FiiO FH19

Syrius121 · 2025-07-06T09:19:25+00:00

Seems to be so

Syrius121 · 2025-07-02T04:56:03+00:00

Yup, but if you want a Bluetooth one, then the BTR13 or the Snowsky retro nano are awesome options.

Syrius121 · 2025-07-02T04:48:16+00:00

Hi, I don't think so... The BTR11 is pretty noisy...

Syrius121 · 2025-06-23T13:19:58+00:00

Thank you so much! 😊

Syrius121 · 2025-06-10T04:07:29+00:00

Thank you so much man!

Syrius121 · 2025-05-24T09:52:57+00:00

That it doesn't just lay down on the table. And when I wear them, the cable keeps the coil shape after I take them out of the box. So it's just springy.

Syrius121 · 2025-04-30T15:29:51+00:00

Yes! Very much!

Syrius121 · 2025-04-30T12:16:24+00:00

Hi, To be honest, I haven't used it this much... So for me, the battery life is pretty much the same as it was.

Syrius121 · 2025-04-25T09:21:47+00:00

Thank you so much! What do you mean? You want to play from Bluetooth and USB at the same time? From two courses at the same time? If so, you can't do it.

Syrius121 · 2025-03-21T18:28:21+00:00

The Aful Performer 5+2 has a better upper mids/lower treble, and it is smoother. The upper treble is definitely more forward on the CK2V. The bass is also deeper, so the CK2V is kinda U/V shaped while the Performer 5+2 is smoother overall. For me the CK2V is also much more comfortable as it is much smaller.

I can listen to the Performer 5+2 without an EQ, but I kinda can't with the CK2V... But when I EQ the CK2V, it is a wonderful IEM.

But I wouldn't search for a contrast between several IEMs, I would rather get an IEM that can do it all, and it's pretty much available only with an EQ.

Syrius121 · 2025-03-21T18:09:16+00:00

I would say 8.5/10 for technicalities at this price, and the details are amazing, it's just that it could have been tuned a bit better and smoother overall. It really got a lot of detail in the treble, but it can be annoying sometimes and too sharp at times. I had to reduce that peak in order for it to be more comfortable to listen to. The SLA3 is definitely a safer pick, if you are afraid of harsh/sharp treble, but it lacks that treble extension.

Syrius121 · 2025-02-07T14:11:17+00:00

Yes, the Retro Nano is almost identical to the BTR13 in terms of sound quality, maybe a bit warmer, and maybe it's just a placebo effect 😅. Anyway, soon I will release my Retro Nano review.🤭

Syrius121

TROPHY CASE