DETHONRAY HPAMP HA-2 CLASS A (16 - 600ohm) Portable IEM Headphone Amplifier
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taffy2207

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Dethonray HA2-700x700.jpg
Dethonray HA-2-700x700.jpg
DethonrayHA2-700x700.jpg
Dethonray-HA2-700x700.jpg



Specification

Output impedance: 0.1ohm

Match earphone impedance: 16 - 600ohm

Max output: 300mW at 32ohm

THD+N: 0.0003% at no-load

Channel isolation: 100dB

SNR: 126dB

Frequency response: 10 - 100kHz (-3dB)

Input: 1 line in (3.5mm analog audio input)

Output: 1 phone out (3.5mm analog audio output)

Rated power: 1W

Life time: 8 hours

Charging time: 2 hours

Battery capacity: 3.7V 2500mAh

Power supply: DC 5V/2A

Electrostatic protection: ±8kV (air discharge), ±4kV (contact discharge)

Operating temperature: 0°C - 40°C / 32°F-104°F

Storage temperature: -20°C - 60°C / -4°F-104°F

Related humidity: 20 - 90%RH (No condensation)

  1. OPAMP Circuitry: The OPAMP uses TI original high-end audio OPAMP OPA627 in circuitry and the left and right each one. Compare with the discrete component circuitry, this headphone Amplifier uses mature OPAMP technology for voltage of the former amplification. This technology avoids noise from the transistor match difference and improve the playability. User can change different OPAMP for adjust amplifying circuitry timbre, performance and so on.
  2. A full Class A Working Status: The rear current amplification circuitry uses Push–pull emitter follower, that have constant current pass constantly. To insure when the amplifying circuitry plays large dynamic music and it still works on full class A. It avoids the class AB amplifying circuitry crossover distortion.
  3. Four Power Transistors: TND+N<0.0004% (@1KHz RL=600Ω) and the output impedance under to 0.1Ω, driving stage add in four power transistors to drive easily market popular Headphones. Supports 16-600Ω impedance headphone.
  4. High Precision, High Stability: The amplifying circuitry uses entire high precision, high stability wafer resistance and the loop capacitance uses two 680pF WIMA thin film capacitors to ensure excellent performance and timbre clearly. Usage time is 8 Hours.
  5. Loop Noninterference: The PCB wiring is strict on the basis of single point ground in order to the different routes current loop noninterference. The bias voltage unit is via independence R&D circuitry structure blue LED and geminate transistors.


Price $199 USD

https://penonaudio.com/dethonray-hpamp-ha-2.html

https://www.amazon.com/DETHONRAY-Adjustable-Headphone-Distortion-Amplifying/dp/B082STQD3R/

Official Site :- http://www.dethonray.com/ (Not on website at time of posting).
 
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jmills8

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300mw ? Seems pretty low.
 
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kukkurovaca

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Seems pretty high for a Class A portable. Aune B1s & XRK Pocket Class A don't even break 100mW. Phatlab Phantasy is 250mW into 300ohm, but the Phantasy is also enormous.

IHIFI100 claims 2.6w w/out specified load, but I don't know much about that amp and googling scant reviews suggests that it may be that it has a class AB mode with high output and a class A mode with 50mW.

I can't think of any other Class A portables offhand, although I'm sure they're out there.

Edit: Oh! Analog Squared Paper also has some class A amps, I think the highest power on them is 500mW into 8ohms, on the TUR-06 which is several times as large as the Dethonray model.
 
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jmills8

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Seems pretty high for a Class A portable. Aune B1s & XRK Pocket Class A don't even break 100mW. Phatlab Phantasy is 250mW into 300ohm, but the Phantasy is also enormous.

IHIFI100 claims 2.6w w/out specified load, but I don't know much about that amp and googling scant reviews suggests that it may be that it has a class AB mode with high output and a class A mode with 50mW.

I can't think of any other Class A portables offhand, although I'm sure they're out there.

Edit: Oh! Analog Squared Paper also has some class A amps, I think the highest power on them is 500mW into 8ohms, on the TUR-06 which is several times as large as the Dethonray model.
I had two Mass Kobo amps they really packed a punch , but they cost over 1800 USD.
 
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kukkurovaca

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I had two Mass Kobo amps they really packed a punch , but they cost over 1800 USD.
Quick check of the Mass-Kobo website, looks like the portables aren't going past 165mW and that's balanced. (Unless I'm missing something.)

Also, I don't see anything saying they're Class A. Class A amps are inefficient, which is why battery-powered portable units tend to be low-power. The Phantasy is the exception, but it's gigantic. (Delightful, but gigantic.) It's easy to find much more powerful AB portables.

The Dethonray is probably able to get higher power outputs in a reasonably compact form factor because it's using opamps, where as the Aune and XRK models are discrete, and the Phantasy and A2P amps are tube.
 
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Quick check of the Mass-Kobo website, looks like the portables aren't going past 165mW and that's balanced. (Unless I'm missing something.)

Also, I don't see anything saying they're Class A. Class A amps are inefficient, which is why battery-powered portable units tend to be low-power. The Phantasy is the exception, but it's gigantic. (Delightful, but gigantic.) It's easy to find much more powerful AB portables.

The Dethonray is probably able to get higher power outputs in a reasonably compact form factor because it's using opamps, where as the Aune and XRK models are discrete, and the Phantasy and A2P amps are tube.
How about this tiny amp ?
FB_IMG_1576810702110.jpg
 
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Waiting my dethonray arrive and already looking to this amp.
 
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I confirm that the HA-2 has enorm power reserve...
 
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jmills8

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Romi Audio has a Class A portable amp with this:
S/N Ratio >125DB at 1KHz

THD : < 0.002%

Bal-Gain:+8DB(Lo-gain);16DB(Hi-gain)

Bal Output Power: 5000MW / 25 ohm ,3000MW / 40 ohm,1200mw/100 ohm

Output impedance: 1ohm

Input impedance: 49K ohm (3.5mm) ,98K ohm(2.5mm或4.4mm-Bal)

Frequency Breadth (Bal-input): 20Hz - 20KHz ( +/- 0DB )

Power Requirement:DC IN 5V (TYPE-C,3A電流)

BATT:3.7V Li-ion
 
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taffy2207

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Romi Audio has a Class A portable amp with this:
S/N Ratio >125DB at 1KHz

THD : < 0.002%

Bal-Gain:+8DB(Lo-gain);16DB(Hi-gain)

Bal Output Power: 5000MW / 25 ohm ,3000MW / 40 ohm,1200mw/100 ohm

Output impedance: 1ohm

Input impedance: 49K ohm (3.5mm) ,98K ohm(2.5mm或4.4mm-Bal)

Frequency Breadth (Bal-input): 20Hz - 20KHz ( +/- 0DB )

Power Requirement:DC IN 5V (TYPE-C,3A電流)

BATT:3.7V Li-ion
That has nothing to do with the HA-2, it's thread crapping. It's a thread about the HA-2. Derailing the thread on page 1 is not a good start. Back on topic, please.
 
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jmills8

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That has nothing to do with the HA-2, it's thread crapping. It's a thread about the HA-2. Derailing the thread on page 1 is not a good start. Back on topic, please.
Ok , then Ill only talk about this amp. Can I buy it and then compare it to other amps ?
 
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Do you think the HA-2 can be compared to desktop amplifiers of the same price range? it's a curiosity of mine
To USD 200.- desktop amps? Sure, without any doubt. Then, the HA-2 also has its limit. I still have to test my LCD-X with it.
 
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