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Rumor has it that tube amps are better for ZMF's, a lot of this has to do with the fact that many modern solid state amps sport output impedance well below 1 ohm, sometimes close to zero. This creates a very high damping factor and more strident and unnatural sound in high impedance headphones. The Cayin iHA-6 is different, and when I first heard it it didn't take me long to understand why this is one of the best solid state amps I've ever heard for ZMF's, period.
The output on low single ended is 10 ohms, high single ended is 120 ohms, and balanced is .3 ohms. You also get the benefit of a low or high current switch and high or low gain.
My preference for ZMFs is to run this amp on low single ended output as the amp does not suffer in sound quality on the single ended outs the way many balanced amps do. The sound is lively, ambient, dynamic and punchy with great weight. It's the perfect one and only amp for your ZMF's, or side-kick to your big boy tube amp when you don't have time to warm it up. It's also powerful enough to run any planars you can throw at it and do it with authority.
More info below:
Powerful 7W amplifier in balanced mode will let propel each handset with power to spare.And can be operated in either voltage or current mode.
IHA-6 is an amplifier developed by each handset, both planar and dynamic. Two balanced outputs, this one 4-pin, the other is a combo, a combination of a balanced, separate for both channels and two unbalanced 6.3 mm with the distinction between high and low gain.
Like other products CAYIN has been designed and built with the best materials available and made with due quality.
Maximum power output in balanced mode: 7W / 32 Ohm
The maximum output power in unbalanced mode: 2,2W / 32 Ohm
Gain: 0dB = Low, Medium = 10dB, 20dB High =
Frequency range: 5Hz-100kHz, -1dB
THD in balanced mode:> 0.01% (1kHz)
THD mode unbalanced:> 0.02% (1kHz)