May 16, 2018 at 3:11 PM
- Jan 24, 2017
- Reaction score
- Jan 24, 2017
I discovered this issue way back with Sennheiser Momentums. Even created a bug with Apple (and Sennheiser) about it. Sennheiser told me they can't reproduce it, Apple did nothing. The same happened later with B&W P7 and B&W PX. I believe the implementation of aptX in Apple's bluetooth stack is simply faulty, artifacts are very audible with test tones.OK, I made an interesting discovery. While I am writing on a full in-depth beyerdynamic Aventho Wireless review, I was sketching the frequency response with REW and its tone generator. Connection was per default active via aptX. (My iMac 2017 does not have aptX HD.) Starting at 6,5 kHz artifacts become very clearly audible, all the way above 14 kHz the treble sounds complete ****. The compression is WAY TOO strong in the treble. You can hear how 6.000 Hz sounds fine and as you move up past 6.500 Hz it starts crackling.
I switched to SBC (with the developer tool Bluetooth Explorer) and all tones sounded fine again. I jumped back and forth to confirm this.
Now I am even more interested in aptX HD.
However IRL I have not had a problem with quality, be it aptX or AAC (even SBC sounds good when the bitpool is high enough).
One problem I do have with my new Amiron Wireless is bluetooth range - with aptX it is vastly inferior (unusable) - I literally take two steps from my Macbook and it starts dropping out. AAC is better, but still not that good. My P7 reached with aptX the same as Amiron does with AAC, and the P7 has much greater range in AAC (50% more would be my guesstimate).