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Qudelix-5K Bluetooth DAC & Headphone Amp
- Thread starter amirm
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I would also be very interested to know that!
Besides the target, the question is also about what AutoEQ optimization parameters they use. I suspect sniffing the web traffic between the App/Cr Extension and AutoEQ would show how Qudelix “queries” the AutoEQ website, but haven’t had the energy to explore that further…
I would love to see Qudelix integrating an AutoEQ tab—really the AutoEQ web interface—into their App/Cr Ext. So we could choose what target, what optimization parameter we want, exactly how AutoEQ works…
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Believe it's Harman target with a couple of dB reduction to that in the bass shelf. Don't believe you can change that in devices /apps that use those eq profiles.
SPK EQ breaks Sound pressure Volume reported in the Input section
My "default receiver profile" Impedance/Sensitivity value in Volume > Option matches my current IEM. However, when i turn on and set the exact same value for the custom profile with 0 EQ adjustments, the reported Sound Pressure volume gets lowered quite a bit, while the actual volume stays the same. Can someone with a 711 coupler do some measurements to confirm my finding?
Misleading volume level is a huge downside to me personally.
Interestingly enough, 20 Band PEQ option with 0 EQ adjustments now also reports a heavily misleading number, 20+ dB lower. I can totally see someone accidentally blowing their ears off. Yikes.
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Are you sure?
Here is an example with "1Custom02", the first one in the AutoEQ list:
Q5K SPK PEQ:
In AutoEQ, selecting Qudelix 5K as the target equalizer App and everything else as "default",I got:
AutoEQ Harman In-Ear 2019:
AutoEQ Harman over-ear 2018:
They are not exactly the same...
And you're correct, there is no way to control & adjust what the QUdelix App does with AutoEQ.
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It defaults to 5128 inspired target, which is called AutoEQ in-ear.
/tree/master/targets/It does not appear to be exactly the same either… Some slightly different default parameters?
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I believe the black table you quote is the same as from the preferred profiles on the github autoeq pages https://github.com/jaakkopasanen/AutoEq/tree/master/results
albeit with the filters differently ordered. Not the autoeq app.
For over ears I believe jaako has set the magic to match a Harman target with reduced bass. At least it used to. May have changed.
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Thanks for clarifying! I didn't know that...
The black table I included above is what the Qudelix App/Cr Ext. loads from AutoEQ. It is indeed the preferred profiles from the result folder in @jaakkopasanen Github page.
Follow-up on the Active Ground feature with headphones...
The E1DA PowerDAC 2.5/3.5mm adapter does not work: the 2.5mm TRRS is wired L+ / R+ / [L- R-] / [L- R-].
But I found an adapter that did work
:The 2.5mm TRRS is wired [L- R-] / R+ / L+ / [L- R-], so it ties the L- and R- together as needed for Active Ground.
I tested the feature with a Moondrop Para, a low-impedance headphones (8 Ohms, 101 dB/Vrms per manufacturer spec.), where Active Ground could make a difference due to the additional current capabilities. The Para cable is a regular 3.5mm TRS to dual L & R 3.5mm. That's what I used with the 5K through the above adapter.
Subjectively, the 5K/Para combo handled better a large bass shelf on top of my current PEQ (which already includes a bass shelf). But in normal use, with my PEQ for that HP and at my typical listening levels, I'm not sure I could reliably tell the difference... I would need to do (a lot!) more testing or do actual measurements...
I have not tested Para with a balanced cable, but I anticipate it would be identical: it should have the same current capabilities as Active Ground, with the additional benefit of a higher voltage swing--not needed in the case of a low-impedance HP.
So, Active Ground could be a good option for "current-hungry" headphones when a balanced (differential) connection is not possible (due to, for example, the headphones wiring).
I have not tested Active Ground when using the 5K as a preamp: the feature could help avoid/alleviate ground loops. I would also love to see if Active Ground has any (positive) effect on SINAD results--something I could attempt to measure if I ever find the time and motivation...
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FWIW, I played with "active ground" too. I used this adapter.
I guess it "works" in that the amp doesn't cut off (turn off active ground and it does). However, it did not seem to affect the max SPL, at least on my DCA Aeon 2 Noires. I guess if I end up using them as portable (admittedly unlikely; the fold is a neat parlor trick but headphones really need to fold flat to be suitable for travel) I will source a 2.5mm TRRS cable.
I guess it "works" in that the amp doesn't cut off (turn off active ground and it does). However, it did not seem to affect the max SPL, at least on my DCA Aeon 2 Noires. I guess if I end up using them as portable (admittedly unlikely; the fold is a neat parlor trick but headphones really need to fold flat to be suitable for travel) I will source a 2.5mm TRRS cable.
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