HD 569

Tonal Profile

Closed 38 mm driver at 23 Ω — the lowest impedance in this batch, chosen so the headphone works from a phone. It ships with a second cable carrying an in-line remote, which is the clue to what it was designed for.

Amplification Warning

23 Ω is the case where a source's output impedance matters most: the rule of thumb wants it below about 3 Ω, and a motherboard jack at 50–100 Ω will both lose level and reshape the bass. Power is irrelevant — 115 dB per volt is loud from anything.