KZ AZ09 Pro Review - Great Bluetooth Adapter With AptX Adaptive!

Here is my take on the KZ AZ09 Pro Bluetooth adapter which supports SBC, AAC, AptX and AptX Adaptive which was a nice surprise. It uses the QCC3040 chipset.

Extra button information - 3 clicks to the left earhook sets it to high gain and 3 clicks to the right earhook gets you high performance mode. Thanks for the heads up :)

This was sent to me by Zeed and thanks very much!

Purchase link:
Random store that sells the KZ AZ09 Pro.

Timecodes:
0:00 Introduction and disclaimer
0:48 Information, unboxing and modified connectors
4:23 User guide overview
5:54 Review intro
6:13 Bluetooth specs and stability
7:00 Noise floor and sound quality
8:45 Latency
9:23 Bluetooth compression
9:40 Bluetooth range and stability
10:07 Power output
10:48 Battery life
11:25 Charging case battery life
11:49 Buttons and functionality
12:16 Visual overlook and modifications
13:23 Microphone
13:42 Negatives
14:31 Thoughts and opinions

AliExpress links provided are linked to my AliExpress Affiliate account & support the channel at no extra cost to you.

[m.o.grunwald]

I've been using this for a few months together with the KZ ZS10 Pro X. Over the years I had many different headphones, mostly high end, but I consider this to be the best investment in audio equipment I have ever made. It's basically perfect both in sound and usability/convenience.

[Allaces]

Thank you for showing the Modification.. I took a razor and fixed mines right away.. Great video...btw 3 clicks to the left earhook sets it to high gain and 3 clicks to the right earhook gets you high performance mode.

[svenhoff]

Nice to see that they support aptx Adaptive. It should include aptx Voice (which allows much higher bitrate also for transfering the mic data). This should improve voice quality a lot if a decent mic is used.

[gabrielnix]

Thanks a lot. I am thinking about getting one, was looking at TRN BT3s Pro. Also have seen CCA BTX and a bunch, which was quite confusing because I couldn't get all the info I want.
This review save me a lot of time and potential waste of money. 🙏

[bwloawesome]

I realize "cons" is subjective, but what do expect for the case? The headphones are already oriented with left on the right and right on the left in order to make it as small of a footprint as possible while fitting the wireless adapters AND the IEMs. At some point, you have to think about what's reasonable. The only way to make it smaller would be to make the case fit the adapters without IEMs installed into them.

[emmanuel_ej]

Just got mine in today, finished the mod (thanks ZEED), and wow these work flawlessly, I really wasn't expecting these to be this good. They fit so comfortably and my ES4s sound just as good hooked up to these as they do wired, just gotta test the battery life but I've already heard great things about the battery on these.

No longer do I have to deal with my Jabras that now lose charge in less than an hour, I can use my ES4s wireless and if the battery runs out, just hook 'em back up to the wire. What makes this even better is that you can use the left and right separately, so for me who listens to podcasts with one earbud this is PERFECT since I can get essentially double the listening time! Couldn't do that on my Jabras since only the right bud works on its own, and the charge on those only lasted 3 hours. My IEMs + this TWS adapter cost 130$ less than the Jabras too, simply amazing.

[guizarbayardoemmanuelisaia]

Can't wait for your review of the UTWS5!

[tonygraydon]

It was designed for KZ IEMs C type. Why would you give it a negative for not fitting other products ?

[lordzed]

Deffo good decision to send You my modded az09pro to try out. I got no clue why KZ limits it to C connector same az10 only C connector. B connector on first AZ09 i had was loose so sent it back before id lose my i3. Modded pro is more rigid than b option az09 haha. Forgot to mention there is loud/gain option not mentioned in manual if you press left button 3 times. I consider them Good price/product. And got same complains as you. Anyhow typing with my dq6s+az10 combo just before setting off for run hehe. One more thing i can say You can sleep with those adapters no problem did few nights :) AAAA and i recorded audio sample will leave u comment with it for others to hear. Recorded off my second phone when i called myself haha.

[andresarkis]

I'm having a hard time with mine.. When I turned on to test it, one of the sides (the right one) seems to not be working. In the case, the module turns on the led in red (but a weak red)

when I take it of from the case, it simply doesn't turn on. I have already tried so many times and so many different takes on the button of the module.. And yet I cannot make it work. There's nothing on the manual on this subject.

Can you help me with this issue?

[Jrm]

I tried charging the case again but it didn’t light up anymore. At first, I was scared that it was the battery that had a problem.

[gamingvibesu]

Does it support aptx HD? My phone doesn't have aptx adaptive

[raidenei]

Excited for mine to arrive. I only bought it for 1006 pesos( 21 dollars) got lucky👌

[pisderata]

wow you have a B pin ;( there's no stock since the release

[BilalAlp-uxhj]

I have kz zsn pro x. Should I buy this or at this price there is better Bluetooth headphones.

[TokenCast]

which product like this do you recommend for someone using the Moon Drop Kato IEM's?

[atlangyt]

Can i connect the earphones without the case box? It's annoying that Avery time that i wanna use them i need to put them in and out the box (sorry for my English)

[McVerdict]

Would a kz esx sound better with these on than most blue tooth earbuds like airpods?

[wilsonchen]

I bought this as well as the QCC3040 Transmitter (same as one of your videos). And i couldn't make it to work in aptx adaptive mode, only aptx. In which the transmitter display 2 beep of green light every 5 seconds. Did you manage to make it work in adaptive mode? and how?

[jhay]

Can someone help me. Does KZ AZ09 Pro's mic do not work at the same time?
Only my right earphone's mic is working.