Modern people go to work with computers, and computers have become the main medium for playing music indoors. However, the computer is not an audio system after all, directly plug the headphones into the computer to listen to music, the sound must not be durable, and the difference is satisfactory.
Everyone knows that if you want to get a good sound, you must pair it with a DAC, let the digital audio skip the computer's processing, and then pair it with a good pair of headphones to enjoy the beautiful sound. However, many DACs are not expensive, otherwise they are bulky, and the price of headphones has been rising. It is difficult to teach people.
Is there any headphone system in the end, which does not occupy space, and the price is affordable? Of course! Optoma Nuforce's marketing is very prosperous. Recently, the NE750M ear canal earphone + μDAC3 mini DAC amp is available. Its price is even cheaper than a trendy brand of headphones.
Is the sound of this headset system as fascinating as the price? Recently, this system sent the evaluation of this site, let me tell you slowly.
μDAC3: Ultra-sensitive mini modelThis time with the USB DAC + amp μDAC3, is not the first time to visit this site. As early as March of this year, μDAC3 has been sent to the station to use the NE800M ear canal earphones of the same factory, so that the editor-in-chief Cai Chengrong left a good impression on this equipment μDAC3.
The μDAC3 sent this time is a red version. The surface of the aluminum alloy case is finely sanded and anodized, which makes the surface of the μDAC3 shine brightly and looks more fashionable than the black version sent last time.
The size of the μDAC3 is 68 x 38 x 21mm, which is smaller than the area of ​​the palm. Perhaps due to such volume limitations, the μ input of the μDAC3 uses a smaller form of Micro B instead of the usual Type B, and is powered by USB 5V. Although the fever line designed for the Micro B USB jack is not common, users can plug the μDAC3 into the computer if they have a USB charging cable for the Android phone. You don't need to find another Type A-Type B. USB cable is very convenient.
Open this mini DAC amp, you can find that the internal circuit is divided into upper and lower layers, the lower layer of the larger circuit board is the digital analog conversion circuit, and the upper layer of the smaller circuit board is the analog expansion circuit. Although the upper and lower layers of the board have been stuck and cannot be disassembled, it can be seen from the gap that the machine is equipped with SaviAudio's Bravo SA9027 decoder chip, which allows the unit to support asynchronous USB transmission. The digital audio sampling rate can be up to PCM file with 24 bits/96 kHz and 2.8 MHz DSD file.
Although the current DAC specification has been supported to 32 bits / 384kHz PCM file, but after all, the Hi-Res format audio file acquisition pipeline is still limited, if you just want to listen to the digital file you transferred from the CD or Spotify Music on the streaming platform such as Apple Music and KKBox, the specifications of μDAC3 are more than enough.
The headphone output hole of μDAC3 is 3.5mm. Although it is only powered by USB, according to the specifications provided by the original manufacturer, the output power of each channel can reach 80mW under 16 ohm resistance. It is believed that the general low impedance ear canal earphone is not a problem. . In addition, the μDAC3 features a digital coaxial terminal and a pair of analog RCA output terminals. It can be used as a DDC and a two-channel DAC. It is versatile and more flexible with other equipment.
NE750M: Titanium plated diaphragm plus diffused sound chamberAs for this pair of headphones, the NE750M is improved by Nuforce's previously introduced classic ear canal earphone NE700M. It is the backbone of the NE series ear canal earphones. The NE750M's earphone casing is cylindrical, made of metal CNC, and the surface is treated with black matte finish. The color is warm and the texture is good.
The biggest difference between the NE750M and the NE700M is that the front cover of the former is designed by Nuforce's specially developed "aperiodic load sound chamber". It has 7 small holes around the outer casing. This design allows the gas behind the unit. There is a venting outlet to prevent the pressure change in the cavity during operation of the unit to cause sound to the sound. On the other hand, the sound waves generated behind the unit can also be transmitted from these small holes, which can prevent excessive sound waves from being reflected by the back cover. The sound waves transmitted in the direction of the ear can maintain the clarity of the sound.
As for the NE750M unit, the Nuforce "Brilliance UWB" titanium-plated diaphragm moving coil drive unit is used. This unit has a diameter of 8.6mm. As we all know, titanium has a good treble extension. Therefore, Nuforce has a wide frequency response with a large-diameter design and a titanium-coated diaphragm.
According to the specifications provided by the original manufacturer, the frequency response of the NE750M is 20Hz - 20kHz. Although I don't know the attenuation of the frequency response curve in the high frequency band and the low frequency band, I believe that the unit designed in this way should have good at both the high and low frequency ends. Extended feature. As for the driving structure of the unit, the coil made of aluminum-plated copper wire is lighter than the pure copper voice coil, which can improve the efficiency of the earphone, and is matched with a powerful neodymium magnet, which is more conducive to reproduce the impact of the sound.
At the time of the audition, I played the digital audio file through the Audirvana Plus 1.5.10 installed on the Macbook Pro, and the USB cable used the Type A-Micro B USB cable attached to the Astell & Kern AK 120.
First play the Bach BWV1035 E major flute sonata, the second movement of the rhythm. With this mini-headphone system, you can listen to it. Although the positioning between the three instruments, harpsichord, flute and oboe is not as clear and variable as listening through the two-channel system, you can still feel the same between each other. Appropriate and comfortable distance, plenty of space, the sound will not be crowded together and make people feel fluent.
More importantly, although the NE750M is only a small ear canal earphone, it has a very similar sense of open-ended earphones. The sound field is wide and wide, and there is no pressure in the brain. In addition, through this system, the harpsichord sounds bright and colorful, the flute sound is as white and comfortable as cotton, and the oboe sound is deep and thick. The three instruments are distinctly distinct, but they all have comfortable and soft sounds. The shape is moderate and the proportion of flesh is just right. I can't feel the cold sensation at all, showing a relaxed and lively musical mood.
After listening to the relaxed and comfortable classic interiors, how do you perform sexy jazz music through this mini system? I played the sound of Saxophone in "Sine Qua Non" (COUP PERDU 01, CD to AIFF), with a full body, with a warm temperature, faintly felt by the airflow from the mouth of the player. The pitch is trembled, which is in line with the imagination of the average person about the saxophone sound.
In the depths of the space, you can clearly hear the sound of brushing, like the surface of the matte-treated brass, shining with a warm copper luster, with a fine grainy texture like a beach, and a subtle bass The cello playing, although its shape is not as prominent as that of a large earmuff earphone or a horn, it can also exhibit a firm, full-bodied flesh. The subsequent piano performance, full of sound, and fascinating pearl luster, and the violin sound of 1:40 seconds, the sound line is smooth and smooth, with silky noble luster.
The sound of each instrument not only has a comfortable and warm texture, but more importantly, the ME750 conveys a sense of hearing similar to that of an open-type earphone. The imaging position is slightly away from the ear, giving people a sense of spaciousness. This tone and sense of space is perfect for the slow, lazy mood of this piece.
Next, play "Bauer Studios: Experiences the Sound" (Bauer Studios SRM018CD, CD to AIFF file) jazz female song "Everything Allowed", listen to the female voice performance of this mini headset system. The opening of the saxophone, jazz drum, piano, bass cello, as in the previous song, through this set of headphones system to convey a comfortable, pleasant mood, but the album's recording has a prominent shape, clear details The characteristics of the piano, therefore, the sound of each key touched by the piano is more grainy, and the drum is hit by the moment, the details of the drum skin vibrating quickly, more like a slender feather, swaying every hair in the ear and each An auditory nerve, the image is quite vivid.
After the female voice singing in the recording, I can immediately feel the pure and light tone of the song, and between the words, I can clearly hear the airflow from the lips and tongues, but not too loud and harsh. , maintaining a proper ratio with the song. The relaxed atmosphere of the jazz tavern and the intimate feeling of being close to the stage, the NE750M + μDAC3 were successfully presented.
Finally, play the song "Gotta leave" from the British blues rock group "Back Door Slam" on "Roll Away" (Blixstreet G2-10087, CD to AIFF file). The opening sound is loud, the sound is loud, and the drum rhythm is solid. Powerful, the sound is shot directly, the place where the sound is broken is fast, the rhythm is strong, and it doesn't make people feel rigid and hard.
As for the electric guitar playing in charge of the main melody, the sound position is slightly in front of the drum sound, and the sound has a very strong vacuum tube smell, which can be heard to play with the left hand finger on the string, resulting in soft and flexible pitch change. It is impossible for people to extricate themselves. After the male voice sings, the texture is loose, but without losing strength, you can hear the emotional emotions in the singing. Although the dynamic fluctuation of this system is not particularly broad, it still clearly feels the emotional ups and downs of the song while listening.
In order to test the DSD playback performance of μDAC3, I finally played (Nabulando) <MA Recordings, M052A, 2.8MHz DSD> in Sera Una Noche. The result can be played smoothly, even if the song is placed in PCM audio file. In the list, whether it is the previous song after the broadcast to the song, or the song is skipped to the next song, it can play without hindrance, there will be no stuck or crashed, no annoying The murmur appeared.
Compared with the 24 bits/96 kHz WAV file of the first song, the DSD file has a lower volume and a slightly lower frequency. However, the texture has a transparent, loose air feel, and the texture is light and the shape is slightly larger. Different sense of hearing. The μDAC3 can play DSD files, giving users the opportunity to experience the special sounds of the DSD.
Sound, price are beautifulBased on the above-mentioned sense of hearing, I found that this system achieves a perfect balance between musicality and soundness. Not only can the details be clear, but it will not be too sharp, and it will not be tired for a long time, and the warm and comfortable sound can bring out more. Touching emotions in music. In addition, the NE750M has an unimaginable sense of space, and it is even more memorable that it is just a small ear canal earphone.
Nuforce NE750M + μDAC3 is fascinating in price and sound performance is not disappointing. Are you still looking for a value-for-money headset system?
Equipment specificationsNuforce NE750M
Type: ear canal earphone connector format: TRRS 3.5mm mini-jack
Line length: 1.37m
Unit type: dynamic coil unit unit diameter: 8.6mm
Impedance: 16 Ohm
Headphone sensitivity: 113 dB (+/-3dB)
Maximum input sound pressure: 121dB SPL
Microphone sensitivity: -38dB (+/-3dB)
Frequency response: 20Hz - 20kHz
Weight (kg): 14g
μDAC3
Digital input: Micro B USB
Output output: RCA coaxial output impedance: RCA 100 ohm, Headphone 5.6 ohm output voltage: 2.0Vrms (RCA 0dB, 1kHz)
Headphone output: 80mW x 2 @ 16 Ohm
Support sampling rate: 24 bits, 12bits/32, 44.1, 48, 88.2, 96 kHz.
Frequency response: 20-25kHz (+/- 0.25dB)
Signal to noise ratio: 98 dB
Total harmonic distortion: 0.05%
Input power: USB powered 80mA/5V
Weight: 0.25 kg
Dimensions (mm): 68 (width) x 38 (deep) x 21 (height)
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