New August 2016 new tuning products! Each amp is made by the owner of Ding Ding on the basis of more than 2,000 already sold, using a new PCB version to further improve, and carefully craft and tune the electro-acoustic characteristics of your headphones!
Special statement:The goal of E3 is not to completely imitate Bayer A1, but to surpass Bayer A1! There is no way out for the so-called complete imitation! Through continuous revision and optimization, and tuning by the owner of Tintin, the frequency response and signal-to-noise ratio of the new version has been equal to the original Bayer A1, and the separation is even better than the original A1! This is the advantage of DIY, and the low price that accompanies it is the gospel of the majority of fans!
A senior in Liaoning posted a comparison test between the E3 produced by Ding Ding and the original A1 on his blog:http://blog.163.com/hass_503/blog/static/51000855201212911921778/(Please copy to the browser and open)There are many more like this. For example, a teacher in Zhejiang has been paying attention to encouraging Ding Ding for a long time. All these have inspired me to do better with my heart!
(New E3Imported brand new high-quality components, low-leakage transformers and imported silver-plated signal wires, super high-quality solderElaborate production, each machine will beThrough subjective listening and professional instruments such as oscilloscope and signal generatorCarefully tested to ensure the effect.)
Exclusive features: 1)Using high-quality transformer and perfect grounding, the whole machine has no bottom noise(Disconnect audio input);
& nbsp; 2)The left and right channels use 2 imported pure copper gold-plated high-quality RCA seats, and 2 independent imported high-grade silver-plated signal lines, with higher separation;
& nbsp; 3) Adopt gold-plated IC socket, which is convenient for you to change different operational amplifiers;
& nbsp; 4)Optimize potentiometers, and conduct multi-level accuracy tests on the finished machine to ensure the balance of the left and right channels;
& nbsp; 5)Imported special audio coupling capacitors are used, and finger selection is optimized according to hearing and instrument testing to ensure the best frequency response;
& nbsp; 6) Use upc1237 to provide comprehensive protection for your high-end headphones
& nbsp; 7) The large number of applications and precise matching of high-precision components make the positioning of the instrument more accurate and the sound field better;
& nbsp;8) According to the actual listening comparison with the original A1, the circuit is further improved, the low frequency control is better, the dive is deeper, and the mid-to-high frequency is more supple
& nbsp;9) Applicable worldwide, 110V or 220V can be selected(230V)Voltage, you can also buy the dual voltage version(Use a dedicated voltage switch).
Our products are guaranteed for 1 year(There are quality problems during the warranty period, and the round-trip postage will be fully borne by the store!)Send 1 power cord! The amp with accessories and packaging weighs about 5 kg, so that the baby can reach your hand faster and better.Always send the best SF Express!
During the actual debugging, two high-end headphones, HD650 and DT990, were used.
The new version of E3 imitated Beyerdynamic A1 headphone amplifier [with UPC1237 protection] headphone amplifier finished product machine, using the latest PCB board, which improves the separation of the finished product! The sound effect is more HI-FI! The effect is close to the original A1!
The following is a comparison between the new version of E3 and the original version of A1(The red one is the A1 indicator provided by the official website of Beyerdynamic, and the new version E3 is the professional test of digital multi-site nbx friends), It can be seen that the frequency response, signal-to-noise ratio, dynamic range, total harmonic distortion and other indicators are the same as the original A1, and the separation is slightly better!
The new E3 frequency response curve is very straight
& nbsp; Parameters measured in the new version of E3
& nbsp; A1 authoritative parameters provided by beyerdynamic official website
328 yuan default composition:
1. E3 Fan Beyerdynamic A1 headphone amplifier finished board, carefully welded, full solder joints (about 230 grams)
2. Divided into silver and black panels(The body is all black)2 versions: 【Brushed panel, solid aluminum knob, brushed body】 All aluminum small case(1Kg)
External dimensions width x height x depth mm 154x60x232
Internal dimensions width x height x depth mm 135x48x222
【For luxuryAll aluminum chassis (bright silver panel + gun black brushed body)Add 35 yuan】
Luxury chassis picture
3.Taiwan gold-plated copper RCA seat【Change to US CMC RCA to make up 16 yuan】
4. Change OPA275 op ampAdd 25 yuan
5. Domestic relays are upgraded to Omron relaysAdd 5 yuan
6.PH BC blue shell electrolysis with better musical tasteAdd 5 yuan
7.Ordinary potentiometer 【Change to JapanALPSType 16Make 13Yuan; Japanese blue shell ALPS 27 typeAdd 43 yuan】
8. E-type transformer ——30VA copper wire with shielding cover double 15V square cow(602g)
【changeR cattle plus 36 yuan】
The latest domestic famous transformer factory was launched in May 2013(Sichuan Hengda)The premium ring cow dedicated to all copper wire audio customized for Ding Ding professionally, the upgrade cost is an additional 45 yuan, and the dynamics and low frequency are further improved.
9. Each channel in the cameraIndependent silver-plated high-quality shielded copper wire, Fixed copper column, machine foot hole tapping, power cord heating shrink tube,,,,,
The line refers to the 10,000 yuan-level Beyerdynamic A1 line as a blueprint. The line has several special features. The input stage uses inverted buffer access. The first purpose is impedance matching, and the second purpose may be for The subsequent inverting amplifier output stage is pre-inverted so that the input and output are still in phase.
The second is that the current amplifier stage does not use voltage stabilization, and the op amp uses a separate voltage stabilization connection, so that the operating voltage of the op amp fluctuates very little during operation, which theoretically makes the dynamics better and the background quieter.
The third is the 2-level Darlington current amplification mode without a general headphone amplifier in the circuit. The BC546 and 556 in the circuit are just a constant current source, which provides a stable bias voltage to the BD139.140, so that the output balance is 30MA-40MA. Nearby, there is also a 100 ohm resistor added to the output, which is more suitable for medium and high impedance headphones from a design point of view.
The key components are all ST original products
The main capacitor uses Panasonic capacitor FC, the sound is more docile, and the three-dimensional sense of the KO-135 capacitor will be improved. The default kit is Panasonic, and the original machine is also Panasonic, which is CE series.
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V5 index of E3 headphone amplifier: