Topping A30 Desktop Headphone Amplifier

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A30 received a lot of praise during the exhibition.
A30 can build a suit set with D30 and other mini speaker amplifier (other products and the shelf need to be purchased separately). This can be a good alternative to the Schiit Headphone Amplifier + DAC bundle.

Overview:
– Two outputs for different impedance of the headphone: 3.5MM and 6.35MM headphone port, can be used for a variety of headphones and earbuds.
– Two kinds of operating voltage mode and three kinds of gain (0dB / 9dB /18dB) selection mode.
– A30 uses the high-performance TI HIFI chip OPA161, OPA2134 (changeable) and TPA6120.
– Maximum output power of A30 can reach up to 1551mW * 2.
– Aluminum body, each part is through high automation, high-precision machining creating (Laser engraving).
Power by a special customized three-way high-performance linear power supply
Most competing products use 1x15V or etc adapter to the amplifier, this 1x15V will be convert inside the amplifier and cause noise and interference. But we use linear power adapter to provide 2x15V and 1x8V to A30, which help A30 avoid these problem. 2x15V used for high fidelity headphone amplifier circuit. 1x8V used for MCU, LED and relay. Less noise, less interference.
–  Using Hi-fi grade NEC relay, WIMA capacitance, Nichicon FW series HIFI electrolytic capacitor, ALPS potentiometer etc

Specifications:
Analog input 1 x RCA (L + R)
LineOUT 1 x RCA (L + R)
Headphone output 1 x 6.35 headphone jack; 1 x 3.5 headphone jack
Unit weight of 525g (not including the adapter)
Unit Size 17.0 cm x 12.2 cm x 3.8 cm

The recommended load impedance range: 16-600Ω
Maximum output power:
1551mW x 2 (PO = Hi, 6.35 headphone port, RL = 32Ω, THD + N = 1%)
291mW x 2 (PO = Hi, 6.35 headphone jack, RL = 300Ω, THD + N = 1%)
152mW x 2 (PO = Hi, 6.35 headphone jack, RL = 600Ω, THD + N = 1%)
757mW x 2 (PO = Hi, 3.5 headphone jack, RL = 32Ω, THD + N = 1%)
258mW x 2 (PO = Hi, 3.5 headphone jack, RL = 300Ω, THD + N = 1%)
143mW x 2 (PO = Hi, 3.5 headphone jack, RL = 600Ω, THD + N = 1%)
The output voltage swing:26.6Vpp
Typical Distortion (@ 1kHz) :
0.0019% (RL = 32Ω, G = 0dB, IN = 0.5Vrms)
0.0003% (RL = 300Ω, G = 9dB, IN = 0.5Vrms)
0.0006% (RL = 600Ω, G = 18dB, IN = 0.5Vrms)
Frequency response: 10 – 200kHz
Input Sensitivity:
10.0Vrms (PO = Hi, G = 0dB)
3.3Vrms (PO = Hi, G = 9dB)
1.2Vrms (PO = Hi, G = 18dB)
Bottom noise (A-weighted):
2.2uV (G = 0dB, RL = 32Ω)
3.2uV (G = 9dB, RL = 32Ω)
8.2uV (G = 18dB, RL = 32Ω)
Gain : 0dB / 9dB / 18dB
Signal to noise ratio:
126dB (PO = Hi, G = 0dB)
121dB (PO = Hi, G = 9dB)
111dB (PO = Hi, G = 18dB)

Packaging list:
Packing List 1 x A30
1 x Liner power adapter with UK plug (Note: Most oversea online sellers especially in china using 2 pin flat plug)
1 x Operating Instructions

One thought on “Topping A30 Desktop Headphone Amplifier

  1. I like the look and written specs of this headphone amp but mainly I bought it because of its specs. If you check on Topping Product page, you will find the impressive linear power supply, Opamp used and the general PCB layout. It uses TI’s OPA 2134 Opamps and more importantly they are on Dip 8 adapter which means you can swap them out. I like the idea of after market mod and the possibility for future upgrade down the road. That’s the good part, the bad – I suspect the figure published for the power rating of this amp might not be accurate. I compared this with my O2 which output 88mW at 600ohms and found that it still has more juice than A30 which claimed to do 152mW at 600ohms. I leave to other customers here to investigate.

    The sound…

    When I plugged in my German Maestro GMP400 headphones, rated at 300ohms, I was amazed at its dark background. A very quiet amp meaning the noise floor was low. Compared to my O2, it certainly have a less aggressive characteristics. O2 has a very balance sounding but it tended towards a more “in your face” sound as compared to the A30. The vocal in A30 seems to be more recessed. It is not a bad thing but it is my preference to have the vocal pushing a bit forward making the sound stage and image more realistic. O2 offers that but a bit too much in my opinion. The bass for the lack of choice of words, I would summarize it as balance and accurate. If your music source has it, A30 will reproduce it faithfully, which to me is key but that’s my preference. The treble is well extended and to some, I suspect may be leaning towards the hotter side. It is however, no problem for a 45 year old man. To me, at this age, with slight hearing loss, this is may not be an issue. Overall the sound is clean, accurate and balance but certainly lack a bit of musicality and realism.

    Overall, this is indeed a value for money amp. Is it a giant killer? I don’t think so but certainly it can certainly KO some of the mid range amp 2 to 3 times its price. Plus the possibility of Opamp swapping, that’s going to be a major plus point.

    For info, I have swapped out the 2 x OPA2134 and replaced them with Burson’s V5i. This is one upgrade that I would make a noticeable improvement to A30. V5i increases its gain and pushes the mid range slightly forward – a sweet spot between the original A30 and O2. This makes the music more realistic added depth to the sound stage. This mod which cost approx. USD84 would set the amp total cost to slightly above S$240 but still manage keep its value for money tag.

    All in all, I am happy with this purchase.

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