A total of 3 reviews of this product on Reddit.
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I know I’m late to the party, but check this dac out.
I’ve had it for a few months now and I have no complaints. Beats the hell out of all the other hi-res dongles I’ve bought or tried.
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Or is a dedicated dongle necessary https://smile.amazon.com/dp/B08MTB2F14/ref=cm_sw_r_cp_api_glt_fabc_KA36T6840VP9S2HH3HZX
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The issue with output impedance is that if the total voltage is divided between the 2 resistances. So if your headphones are 7ohm and the output is 2ohm about 20% of the output voltage is getting lost and not going to the headphones.
That being said iems are usually pretty sensitive so they don’t need a ton of voltage. You could most likely get by with your phone but a good dongle would probably be a noticeable step up.
Ibasso dc03 for 70
https://www.amazon.com/dp/B08MTB2F14/ref=cm_sw_r_cp_apa_fabc_7Z321JS693G6ZSDP39W1
I think this one is supposed to be good but I can’t vouch for it personally
Temptotec sonata for 40
https://www.amazon.com/dp/B084YX4MZD/ref=cm_sw_r_cp_apa_fabc_88765XSD19W8B8Z7R97V