The Qudelix-5K thread
May 29, 2020 at 8:19 PM Post #438 of 4,753
Am I misremembering or had they ditched the 2.5 mm balanced jack at some point? It looks like it's back now?

They changed the DAC/amp chip mid way from AKM to ESS. However, 2.5mm socket is always there.
 
May 30, 2020 at 4:09 AM Post #439 of 4,753
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May 30, 2020 at 9:40 PM Post #441 of 4,753
May 31, 2020 at 10:41 AM Post #442 of 4,753
I noticed something off in the specs.
According to the 5K specs page aptX Adaptive is supported.

Qualcomm spec page lists:
Qualcomm® aptX™ audio playback support: Qualcomm® aptX™, Qualcomm® aptX™ HD

So no Adaptive codec
 
May 31, 2020 at 11:04 AM Post #443 of 4,753
I noticed something off in the specs.
According to the 5K specs page aptX Adaptive is supported.

Qualcomm spec page lists:
Qualcomm® aptX™ audio playback support: Qualcomm® aptX™, Qualcomm® aptX™ HD

So no Adaptive codec

On the same Qualcomm page, look at the left side of listed spec, under 'features':
  • aptX, aptX HD and aptX Adaptive support

However, note that aptX Adaptive is less so to improve SQ but more to improve stability / latency from aptX HD. So if you already getting good / stable connection for aptX HD (or even LDAC) and mainly used it for music, then you might not notice much improvement from aptX Adaptive. What aptX Adaptive brings to the table is basically a more efficient coding / decoding process and lower latency (*by dynamic scaling, which by lowering quality temporary to improve stability) , which means movie / video watching with BT headphone / adapter will benefit the most. However, it is not aimed at improving SQ as it still samples at the same bit depth / bit rate as aptX HD, at 24/48.
 
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May 31, 2020 at 12:30 PM Post #446 of 4,753
Hi. Can anyone recommend a decent/affordable 2.5 cable that plugs into L&R inputs on receiver? Thanks

Yep, please don't connect any balanced output to the RCA left and right input of your receiver - unless you can be 100% certain that the RCA input is indeed balanced input (*which generally they are not). RCA input on most receiver are single-ended internally (meaning their share the same ground path). Connecting balanced output to single-ended input could potentially cause the balanced output internal circuit to overload and burn out.
 
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May 31, 2020 at 8:10 PM Post #447 of 4,753
Yep, please don't connect any balanced output to the RCA left and right input of your receiver - unless you can be 100% certain that the RCA input is deed balanced input (*which generally they are not). RCA input on most receiver are single-ended internally (meaning their share the same ground path). Connecting balanced output to single-ended input could potentially cause the balanced output internal circuit to overload and burn out.
A fine heads up! Thank you!
 
Jun 1, 2020 at 3:05 AM Post #449 of 4,753

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