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Amp For Planar Headphones
When it comes to amps for planar headphones, you want something that has plenty of power to drive them. Planar headphones require more voltage and power than dynamic headphones, which require only a tiny amount of current.
Look for an amp that has an impedance range that is recommended for headphone use. The majority of amps will have this information on their spec sheet or on their website.
AP10H+
The NVA AP10H+ is a headphone amplifier developed and made by hand in Great Britain. It is a powerful amplifier that can drive almost any headphone planar (and some dynamic headphones) available, regardless of their impedance or sensitivity. Its high voltage and current output will offer a high-quality dynamic headroom for an outstanding sound.
Planar magnetic headphones, unlike speakers, are essentially resistive loads. They are, therefore, relatively easy to drive. However, they require higher levels of drive than most receivers can produce. To achieve their 130dB SPL, they require 4V5-10V5 with 1mW of input. This is why solid state amplifiers in class A are the best choice for them.
The AP10H+ features an output transformer that boosts the power to a greater degree, and includes a volume matching resistor that works with the majority of headphones. This allows the AP10H+ to provide more than double the amount of power to a pair of 32 ohms dynamic headphones.
Nirvana IV
The Nirvana IV tube amp has a warm sound signature. This powerful amplifier can power magnetic headphones that are planar easily and has a variety of output modes that work with most headphones' impedances. It has an external power supply unit of high quality that delivers constant currents to the amplifier. The amplifier was made in Serbia by Milomir Trosic, and it makes use of hand-crafted transformators that give incredible musicality.
The Nirvana IV is a single-ended amplifier that can deliver 6.5W pure power of class A. It is capable of driving high-impedance headphones and can handle the HiFiMan SUSVARA open-back magnetic headphone easily. The bass response and dynamic depth are outstanding. The Nirvana IV has a rich mid-range, smooth highs and a dazzling amount of detail.
This amp is comparable to the Auris ha-2SE and Headonia amplifiers however, it's a better one in general because it has a more precise and balanced sound. When paired with the right headphones, it will reveal the hidden layers of music and is extremely enjoyable to listen to. Its balanced mode is impressive, since it adds warmth and tube smoothness to the sound that is difficult to find in other headphone amplifiers.
Many people who love headphones appreciate the warm sound of vacuum tube amplifiers. They can be difficult to operate and require a large investment. They also produce a lot of heat, so you should choose one with a sturdy cooling mechanism. The Nirvana IV is a good choice for those who are discerning about their audiophiles as it can be customized with a variety of different tubes.
The Cayin HA-6A is a good choice for anyone looking to experience the power of a tube amp but with a price that isn't too expensive. The amplifier is designed to work with a variety of headphones and is compatible with the majority of popular digital audio formats. Its output switch allows users to choose from three gain settings that are suitable for low, medium and high-impedance headphones. It comes with a remote and an external power source.
Dragon Inspire IHA-1
The Dragon Inspire IHA-1 is an impressive hi-fi device. It was created (and manufactured) by Dennis Had, founder Cary Audio. It has a timeless design that is reminiscent of vintage tube equipment, despite the crazy red paint job.
The IHA-1 uses a pair of dual triodes that are 6SN7 to drive headphones and has transformer coupling on both the outputs and inputs which makes it compatible with virtually every headphone. It's also compact and has an unobstructed signal path, without feedback loop.
The IHA-1 has a full and acoustic sound that we've found to be a hit with those who appreciate a full listening experience. It's a great option for classical, alternative/indie, and acoustic tracks. It's also a great choice for country, pop and rock R&B tracks. It can be a bit warm for genres with high energy, like EDM or Metal. Tube rolling can help make up for the warmth.
The IHA-1 isn't an exception to this rule. In general, headphones with higher sensitivity tend to pair well with tube amplifiers. We tested it using a broad variety of models for headphone, including the Focal Clear HiFiMan HE-560 Grado RS-1, and Mr. Speakers Alpha Prime. The IHA-1 provided a full and round sound, with side-to-side imaging that was remarkably precise. It also created an illusion of three-dimensional space.
The standard IHA-1 comes with a pair of Russian 6SN7 tubes. However, it is able to be upgraded to a NOS RCA GZ34 tube for an additional $100. The GZ34 has a warmer sound than the reissue 5Y3GT but it has a more natural and bassy sound. It also has a smooth bass response that's not too recessed to make the majority of listening experiences amazing and a breeze to wear.
The IHA-1's remarkable 3-D soundstage is particularly evident when coupled with the Focal Utopia headphones. The increased sense of space allowed the Focal's already precise lateral imaging to extend outward and forward, creating a vast soundscape. Listening to the track 'Nublado' from Sera Una Noche [MA Recordings, 16/44.1], for instance, was akin to being in a hall that just happened include headphones.
Cayin HA-6A
This tube headphone amp by Cayin is billed as a "Tube Rolling Paradise." It's a budget portable amplifier that's astonishingly powerful. It can power headphones that are planar like the HiFiMan SUSVARA and also sound fantastic when paired with dynamic headphones, such as the Audio-Technica's ATH-A1000X. It's also highly adaptable, making it a good choice for music lovers who have different preferences in their music.
The HA-6A is a transformer-coupled device with matched outputs transformers to give a balanced output. The power supply has been fully regulated to reduce the ripple effect resulting from voltage amplification. The circuitry is made by hand using premium wires and point-to-point handling, resulting in greater transparency and integrity of the signal. This amp features a high-grade UV meter that displays the signal strength.
HA-6A features the option of switching between triode and ultralinear modes to provide a different audio experience based on your needs. If you want a rich, warm, and musical sound, run the EL34 tubes in triode mode using moderate output impedance. If you're looking for a fast, detailed sound, with lots of muscle, then use KT88 tubes set to ultra-linear with low output impedance.
HA-6A offers an optional tube rectification feature for those who prefer an unison sound. This improves the overall sonic quality of the amplifier. This feature is ideal for users who enjoy the wide variety of music genres, from classical and orchestral to hip-hop, EDM and other electronic music.

helpful site is also designed with a huge, custom-designed output transformer that offers high-grade nickel plating. This makes sure that the amplifier is rugged and durable. It also features an innovative current adjustment that can adjust the impedance of various headphones.  
The Cayin Ha-6A unlike the Schiit Vali 2+ has some tube bloom. The soundstage isn't as large or detailed. It also has a much faster decay time than the Vali 2+ and an overall more neutral tone. It has a forward midrange, with more detail and more bass, as compared to the Vali 2+. However it doesn't have as much treble.