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On the extreme end of things, the infamous Tin HiFi P2, a planar-magnetic IEM with a notoriously low sensitivity rating did not fare well on the S9 PRO Copper Limited Edition. It is important to consider the limited power-draw that dongle DAC/Amps can derive from a smart device. Martha adopts the fourth-generation professional HiFi audio processing circuit architecture developed by Hidizs Acoustic Laboratory. This is a fully balanced circuit architecture, consisting of four parts: USB interface processor, DAC, independent headphone amplifier and POP sound cancellation system. The DAC uses ESS Technology's flagship DAC chip ES9038Q2M, which uses ESS Technology's patented 32-bit HyperStream® II QUADDAC™ architecture and Time Domain Jitter Eliminator. It ensures the extremely high accuracy of audio data and represents the highest level of audio decoding technology. Its excellent characteristics make it the first choice for audiophiles and high-fidelity music lovers. This is the strong point of the S9 Pro, it is a very powerful device for its size. Ok, 200mW balanced and 100mW unbalanced might not seem like a lot when we are used to talking about desktop (or larger portable, battery powered) devices but it is the difference between being able to enjoy the sound from headphones and certain IEMs on something this small or not, as the case may be with something like the Apple option (which I believe is around 30mW).
As I said, this price I find reasonable as the S9 Pro is still around 80€ here at the time of putting this review together. Green Light” Anodizing fast roll-off (Default Filter): Vocals are slightly forward, and high frequencies are extended with reduced resonance.Hidizs is not giving fans a break. After the fire at the AKM plant in Japan on 20 October 2020, many of the audio devices that used AKM chips have had to move to another manufacturer, due to the difficulty of finding them. This is the case of the S9, which used an AK4493EQ as a DAC. The new S9 Pro uses Sabre's ESS9038Q2M, one of their flagship chips for mobile devices. The external design is largely the same, but the specifications have been improved. Channel separation is higher, harmonic distortion is lower and power is higher, especially in its balanced mode. All other properties are the same. Thus, this new dongle supports DSD521 and PCM32/768, it also has ASIO support and can run on Windows 10 without drivers. Let's have a look at the performance of this new product.
During operation, it should be noted that the body, especially on the glazed sides, becomes a little warm, especially when the volume is increased. In a low voltage regime the temperature is not bothersome. But taken to the limit, as when I took the measurements, i.e. at full power, the heat reached by the device is high, even worrying. I assume that, even so, it is within the "normal" operating range, without suffering any damage. The rendition of the sound is same like its midrange, it demands attention and very lively, “here, listen to this cymbal, crashes and hi hat !”
Low-impedance, high-Sensitivity IEM
Martha, is the name of the last surviving female passenger pigeon, the bird species with the largest population ever recorded on Earth. In 1914, Martha passed away in the Cincinnati Zoo, marking the official extinction of a species that once numbered over 5 billion individuals. Their sheer numbers led people to believe they would never go extinct. The S9 Pro seemed to fit this description along with a few other contenders and was actually the cheapest option out of those that were easily available here.
These filter effects provide you with a wide range of sound profiles to suit your preferences. Here's a breakdown of these seven filter effects:I started testing with my Sennheiser HD-650 high impedance headphone using unbalanced output. There was enough power to generate good volume. Everything was right with the sound with great fidelity, detail, and overall performance.
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