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What's the real reason that laptop batteries are made not-accessible?

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IanB:

--- Quote from: SilverSolder on December 11, 2021, 09:38:42 pm ---Yes, audio specs are often of the "if somethin's worth doing, it's worth OVERdoing" type!

--- End quote ---

Indeed. I'm a bit confused about the balanced 2.5 mm headphone connector. Apparently, balanced connections are good for improved noise rejection, but is there ever an issue with noise on a headphone cable?

NiHaoMike:

--- Quote from: IanB on December 11, 2021, 10:02:42 pm ---Indeed. I'm a bit confused about the balanced 2.5 mm headphone connector. Apparently, balanced connections are good for improved noise rejection, but is there ever an issue with noise on a headphone cable?

--- End quote ---
Rarely an issue for headphones, but for amplifiers it's a big problem especially if the source device is connected to the noisy power ground. Apparently, automotive amplifiers have solved that issue by using differential amplifiers for the 3.5mm inputs. Not as good as a proper differential link, but automotive has been an acoustically noisy environment so it was good enough. EVs have changed that - in slow traffic or stopped at a light, they're nearly silent. Newer car radios have USB ports which finally provided a digital input as well as improve integration with portable devices. Or just use a USB drive for music - why waste expensive storage where cheap storage is plenty good enough?

magic:
Dunno, go ask on head-fi :-DD :popcorn:

Realistically,
- you gain some fractional stereo separation (no shared ground return), probably irrelevant due to the resistances involved
- you get to use different upstream gear - possibly the biggest difference which actually exists

SilverSolder:

--- Quote from: IanB on December 11, 2021, 10:02:42 pm ---
--- Quote from: SilverSolder on December 11, 2021, 09:38:42 pm ---Yes, audio specs are often of the "if somethin's worth doing, it's worth OVERdoing" type!

--- End quote ---

Indeed. I'm a bit confused about the balanced 2.5 mm headphone connector. Apparently, balanced connections are good for improved noise rejection, but is there ever an issue with noise on a headphone cable?

--- End quote ---

Theoretically, if one channel is playing very loud and the other is dead silent, you could get some cross talk from one earbud to the other if the cable has a common ground and significant resistance?

Googling returned an apparent yes:  https://www.soundonsound.com/sound-advice/q-it-normal-get-crosstalk-appearing-headphones 

But the problem becomes negligible if four wires are used, so the two "ears" do not share a common return cable.

In other words, this is a non-issue with decent headphones...   looks like more audiophoolery, to some extent.

SilverSolder:

--- Quote from: NiHaoMike on December 11, 2021, 10:31:36 pm ---
--- Quote from: IanB on December 11, 2021, 10:02:42 pm ---Indeed. I'm a bit confused about the balanced 2.5 mm headphone connector. Apparently, balanced connections are good for improved noise rejection, but is there ever an issue with noise on a headphone cable?

--- End quote ---
Rarely an issue for headphones, but for amplifiers it's a big problem especially if the source device is connected to the noisy power ground. Apparently, automotive amplifiers have solved that issue by using differential amplifiers for the 3.5mm inputs. Not as good as a proper differential link, but automotive has been an acoustically noisy environment so it was good enough. EVs have changed that - in slow traffic or stopped at a light, they're nearly silent. Newer car radios have USB ports which finally provided a digital input as well as improve integration with portable devices. Or just use a USB drive for music - why waste expensive storage where cheap storage is plenty good enough?

--- End quote ---

A good hack for circumventing this problem in a car is to use an audio signal tranformer to galvanically isolate the signal between the source and the destination device.  Miracle cure, in many cases.

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