I just bought The Sundaras and Fiio K7 to pair it with. I want to use them balanced so I go looking for a balanced cable and found 2 options on Hart Audio.

First one is 3.5mm https://hartaudiocables.com/collections/hifiman/products/custom-dual-3-5mm-trs-balanced-headphone-cable

And second 2.5mm https://hartaudiocables.com/collections/hifiman/products/custom-dual-2-5mm-balanced-headphone-cable

So which one should I get? Are there any differences?

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GarlicBiscuits t1_jcq3mth wrote on March 18, 2023 at 6:08 PM

I highly, HIGHLY recommend checking out Fog City Audio's shop for this. They have cables for a ton of different headphone brands that can be customized by length, end connection, and even a bunch of color patterns. I recently ordered a 4.4mm balanced cable from them for my Arya Stealths, and it's just wonderful. They're braided too, so quite flexible with pretty much no fuss compared to some stock cables.

ConsciousNoise5690 t1_jcq6c2d wrote on March 18, 2023 at 6:27 PM

Yes, one has a 3.5 mm TRS the other a 2.5

So one will fit in the earcup and the other won't.

As you do have the Sundaras, measure the current jack that go into the earcup. My guess is 3.5 https://hifiman.com/products/detail/286 but make sure before you order.

Have it terminated with a mini XLR and order a mini XLR to 4.4 pentagon as well.

The fun of the mini XLR is that Hart offers all kind of adapter making it possible to connect to anything https://hartaudiocables.com/collections/hacable-kit

Shinreixdk t1_jcpzdsf wrote on March 18, 2023 at 5:40 PM

I have used this cable for nearly 2 years with my Sundaras. They are soft, tangle free and have a good fit. They use 2x 3.5mm to the cans and terminate in a 4.4mm plug for your source. Picture of the cable.

jonm2k22 t1_jcrvvht wrote on March 19, 2023 at 2:05 AM

You want the 3.5mm because that's what the Sundara uses. Then pick 4.4mm TRRRS as the termination for your Fiio K7.

No-Context5479 t1_jcr4qvo wrote on March 18, 2023 at 10:36 PM

Uhm the Balanced port is 4.4mm on the K7 so your balanced cable should terminate in a 4.4mm connector

Jackstraw335 t1_jcpw6ay wrote on March 18, 2023 at 5:18 PM

Those are for the terminations that plug into the headphones. You need a 3.5mm for the Sundara, and then select a 2.5mm TRRS as the single end termination for balanced.

fortean t1_jcpwjcy wrote on March 18, 2023 at 5:21 PM

Op this is WRONG.

The termination on the K7 is 4.4 balanced, not 2.5

zjorsa OP t1_jcpxu5l wrote on March 18, 2023 at 5:29 PM

Thanks, luckily I didn't buy it yet :)

Jackstraw335 t1_jcpx150 wrote on March 18, 2023 at 5:24 PM

Thank you for the correction. I just assumed 2.5 lol

zjorsa OP t1_jcpwp7a wrote on March 18, 2023 at 5:22 PM

Thanks!