The protagonist to introduce this time is AKG's K340. The once flagship of this K340 was not the current small plug. It was put into production in 1978 and was discontinued in 1993. Unfortunately, it has been overshadowed by the elder brother KK's light, and its popularity is far less than that of her brother.
In fact, K340 uses a lot of black technology, even if it is now, it is quite complicated. An excerpt from the Internet (original here):
1. Moving circle: Use a moving circle unit to restore the low frequency band, unit impedance 600Ω.
2. Electrostatic: An electret electrostatic unit is used to reduce high frequencies.
3. Slave: Five passive diaphragm units were used to optimize the sound field and the semi-open structure was completed.
4. Semi-open: AKG's "semi-open" does not mean openness is not high, but AKG's unique technology, low-frequency use of closed-class work, high-frequency use of open work.
5. Acoustic three-way frequency: Many people have to wonder, how to divide the frequency of 2 active units? It is true that the two active units can only be physically divided by 2 at most, but because the semi-open, the dynamic circle unit is divided by the open mode and acoustically divided, so the K340 is an Acoustic 3 crossover headphone.
In addition, the electret life is relatively short, only about a year, but AKG has carried out a special treatment of the electret (it seems to be coated), so that it can reach about 30 years. The electret cell has an extremely high impedance, and akg also installs an impedance converter.
A headset, made a moving circle + an electrostatic +5 driven unit, acoustic three-way, had to say that AKG was really too rampant, and KK, innovative awareness and technical strength unmatched. In the past, the price of this machine was not expensive. Now, the second-hand price is not too expensive, and it is more than 1k. However, it is hard to get a good state of affairs. I only listen to Lao Shao and listen to the antiques. As it is an ancient artifact, it does not put a link.
Do not talk nonsense, or return to the topic, to see this ancient artifact.
From a current point of view, the k340 may be slightly out of date, especially the winding of the phone line headphone cable, has a strong retro taste. ,
Positive headphone. The classic akg-type structure, double-headed beam, elastic adaptive headband.
LR logo on the adaptive headband link above the side unit bracket.
The side of the unit has the AKG logo and the K340 product name. The side of the headset looks closed, much like a closed-type headset, but in fact this is a semi-open headset.
There are two head beams, which are estimated to be akg's secret technique and wire tuning. The headband is very wide.
Wearing a sponge on the inside, it feels good to wear.
The K340 is now equipped with Audeze's sheepskin earmuffs. The original earmuffs are much lighter than this. The outer mesh of the unit is a fine plastic grid with the electret unit visible directly. The unit is golden and belongs to the high-frequency version according to friends. There is also a version of the enhanced low frequency that is introduced for the North American market, called the low frequency version, and I don't know the specific characteristics.
K340 replaced with audze earmuffs, the sound change is still relatively positive, because the earmuffs are a lot thicker than the original, the first direct change is that the plastic grid inside will not pressure the ear. Secondly, the earmuffs are thickened, the distance between the unit and the ear will be a little wider, the sound field will have more obvious enhancement, some will become bigger and more regular, and the low-frequency aspects will also be strengthened. However, there is a shortcoming that is Audeze's ear. The hole in the middle of the cover is elliptical, and it will block the electret unit and the rear driven shock film, which will affect the sound. The rotation angle is different and the sound is also different. You need to try and adjust it yourself. In addition, the earmuffs are too thick, and the lower half of the earmuffs of a friend with a large head can be easily attached without causing a sound leakage, and the low frequency can be greatly affected. Rotate the earmuffs properly to turn the thick end of the earmuff to the root of the ear, but it is not particularly ideal. Pressing the lower part of the earmuffs tightly by hand will improve the low frequency obviously.
Behind the sense of hearing, are based on Audeze earmuffs.
By using a picture on the Internet, this is the internal structure of the K340. The topmost one is like the shower, the electret unit, and the next few are from the shock film.
K340 itself is relatively high impedance, low sensitivity, but also a headset is not easy to push sound. The valhall2 has a high gain, and it also has to be turned to a relatively large volume to get the k340 to get normal sound pressure. At the same volume, 9500 has already ringed until it reaches the head. With the low-end machine to engage in the 340, basically can only say that it can push down enough loud, far from being good, the sound field is relatively dry, the low frequency is also very weak. However, high-frequency can slightly appreciate the delicate static flavor.
After hitting the DNA, K340's voice has stretched a lot. The K340's sound field is relatively wide and it feels natural. Most of the AKG's sound field is horizontally wide and vertical. This is not particularly good. Even if KK is just a knot, its depth and height are not particularly good. However, the sound field of the 340 is fairly regular, and the depth and height are also acceptable. Of course, this part of the reason is also the blessing of the Audeze earmuffs. The vertical and high directions of the sound field of the original earmuffs are generally the same.
After improving on some of the Taiwanese planes, the biggest improvement is in the low frequencies. The valhalla2's low frequencies are relatively crippled, and the amount of sense is less. The dive is also very weak. The intermediate frequency is also very weak, just like the musicians did not eat. After the DNA, there was a feeling of hungry people who had eaten for a few days. When they were all full of energy, the drums were vigorous and the singer's musicians became harder and better. However, the performance on the DNA always makes you think that this headset seems to have some oil and water not extruding out, and there is still potential for growth.
Using power amplifiers, the dynamic and low frequencies of the K340 are significantly improved, but the high frequencies are more aggressive, some are harsher, and the tooth sounds are thin, and the high frequencies and the low-middle frequencies are slightly out of touch, which should be pushed through.
After connecting RKV's adapter, the sound is normal, and the connection between high-frequency and low-middle-frequency is not abrupt. The high-frequency is no longer harsh, and it is very smooth and delicate. I have always had limited expressive ability, and I have to say that I can only think of smooth and delicate. Describe. IF is also very delicate, low-frequency dive is not bad, the sense of volume is not small, I think unlike many friends said before the low-frequency residual, of course, may be related to the use of Audeze earmuffs.
The quality of the K340 is actually not very prominent. The sound is very different from the ordinary moving circle. The sound is very clean, but it is not particularly natural. It sounds less real than it sounds, but it is very nice. The control is relatively general. The large-scale and large-scale concertos are not very popular. The piano is also relatively common, but listening to chamber music and young girls is a real hand. This is especially true for listening to Xiong Muxingli, hollyhock, and Alan. My word is poor, it's really nice.
Finally with the big brother KK together. This should be the last glory of AKG. . .
In fact, I was wondering why so many friends kept their headphone and did not play well. After touching KK and K340, I slowly discovered that the old machine had its own unique place. The more you play with hifi, the more things you touch and the more you fear, the more you start playing, the more arrogant I think that many things are metaphysical, but the more you play, the more you discover that it is not.
Before sunning INT204, there was a friend who was joking that the broken tin box could sell 1W, only for core players to recharge their faith. At that time I responded like this:
"This is the same as the Canon 85 1.8 selling 2k, 85 1.2 selling 1w2. You have to say it, you can take pictures, and it's equally good to receive the F4. It's fine, but do you think the photos they took were exactly the same? The 50/0.95 for Leica and the 50/0.95 for S1 are the same. Is it exactly the same?
Some people may say that photography, the head behind the camera is more important. But you give these two equipment to the same person and the things you shoot will still be bad.
Besides iPhone7 and millet 5s, can call, can use the Internet to play, the effect is the same? There is still bad.
What areas will play later will play more and higher, the cost is getting lower and lower, reaching the stage of 100 pieces of 3 goods or 1000 pieces of 4 goods. I think it is normal to look at it.
Areas that are not well-known to me, it would be better to really try to play it again. â€
This passage was also given to friends who were prejudiced against hifi.
Thank you all for watching this time.
Fiber patchcord and pigtails are essential passive components for FTTH ODN connectivity; Bwinners offers different types of fiber connectivity cables with fully customized connectors, main products including Fiber Patchcord, Fiber Pigtail, Fiber Bunchy Cable, Ribbon Fiber Cable, Fiber Breakout Cable, Fiber Drop Cable, Fiber MPO Patchcord, Optical Cable Pigtail, Fiber Optic Ribbon Pigtail, Fiber Optic Patch Cord, Optical Fiber Pigtail.etc.
Technical specifications:
|
Pigtail Connector |
PC (SM) |
UPC (SM) |
APC (SM) |
MM |
|
Return Loss (dB) |
≥45 |
≥50 |
≥60 |
≥35 |
|
Insertion Loss (dB) |
≤0.2 (max≤0.3) |
|||
|
Repeatability (dB) |
≤0.1 |
|||
|
Durability(1/Matings) |
≥500 |
|||
|
Operation Temperature (°C) |
-25~+70 |
|||
|
Tensile Strength (N) |
≥90 (Φ3.0), ≥70 (Φ2.0), Φ0.9 |
|||
|
Fiber |
9/125um, 50/125um,62.5/125um,ect |
|||
|
Diameter |
0.9mm 2.0mm, 3.0mm etc |
|||
|
Cable material |
PVC, LSZH |
|||
|
Cores |
Simplex, duplex, 4cores, 6cores, 8cores, 12cores etc |
|||
Features:
1. Good durability
2. Good exchangeability
3. High temperature stability
4. Low insertion loss and back reflection loss
5. Superior Quality Standard PC/UPC/APC Polishing
6. Standard: Telcordia GR-326-CORE, TIA/EIA and IEC
7. The patch cord can be customized according to customer`s specific requirements
Applications:
1. Optical fiber communication system
2. Telecommunication network
3. LANs and WANs
4. FTTX, LAN, PON & Optical CATV, Local ring net
5. Optical fiber test equipment
6. Optical fiber sensor
7. Industry and military application
Free samples are available for your testing.
Optical Cable Pigtail,Fiber Optic Ribbon Pigtail,Fiber Optic Patch Cord,Optical Fiber Pigtail
Ningbo Bwinners Optical Tech Co., Ltd , https://www.sijee-optical.com