As one of the most famous units in the history of hifi, the 18W/8545-00 of the Shishibao has been in existence for nearly 30 years. In the third generation of the core technology of the gentleman treasure, the new 8545 as an upgraded version of the performance was finally born - the official model of the new unit is 18W/8545-01.
From the naming point of view, although only the suffix is ​​changed from 00 to 01, this shows that the official Shishibao official wants to retain the original features of the old 8545, and intends to make performance upgrades to keep up with the times. 
The biggest difference between the new 8545-01 and the old one is that the coating on the diaphragm looks more shiny. As we all know, the change of the diaphragm to the frequency response is huge, which is also confirmed in the official frequency response curve: 
Compared with the old model, the frequency response curve is smoother due to the influence of the surface coating. It is obvious that the influence of the splitting vibration is greatly reduced, which has a positive effect on the details and transparency of the sound. At the same time, the off-axis condition of the unit has also been improved, and a higher crossover point can be used, and the selection range of the tweeters that can be matched is widened.
Since the official use of the baffle test, and the actual test of the box slightly different, the new 8545-01 box test results are as follows: 
The actual frequency response is very smooth and the off-axis response is excellent. It is a very easy to use mid-woofer unit.
Another significant difference between the new 8545-01 and the old one is the elastic wave. The new elastic wave presents a yellow-black appearance, and the height of the supporting platform of the elastic wave is slightly higher than the old one. It is understood that the new elastic material has a better linear range, while the structural adjustment ensures better symmetry. These two points combine to make the new 8545-01 unit have lower distortion performance under large dynamics.
At the same time, it can be found that the new 8545-01 improves the ribs and thickness of the basin frame, providing strong support for the unit's excellent performance under large dynamics.
In addition to these obvious adjustments, the 8545-01 has made even more improvements:
First of all, the original slightly thick diaphragm, the new diaphragm reduces the weight while the rigidity remains unchanged. Secondly, the strength of the magnetic circuit is increased, and the lighter diaphragm is used to increase the sensitivity by 1 dB, which is more suitable for driving. In addition to the above-mentioned adjustment of the folding ring material is visible to the naked eye, the folding ring also adopts a new rubber material, and the new material is more supple, and combined with the improvement of the above two aspects, a better transient response is obtained.
The following table compares the technical parameters of the old and new models 8545-01 and 8545-00:
The improvement of these technical parameters is also reflected in the actual distortion test (test sound pressure level 94dB/1m): 
The original low-frequency distortion of the old model is slightly larger, and the subjective listening feeling seems to be awkward. It has not been seen in the 8545-01, and the average distortion is basically less than 0.5%. This is a very good test result. Even at low frequencies, 50Hz is only 1.3%. If you use a strictly designed cabinet during testing, you will actually have lower distortion results.
In view of the fact that the old 8545 is a classic product with a history of nearly 30 years, the older generation of fans will definitely notice the service life problem. Due to the domestic environment, the wetness in the southern part is serious. Some old 8545 units often work at high temperature and high humidity. In the high acid and alkali environment, there may be small faults such as lead wire breakage, which can be repaired, but it affects the user's mood. In this regard, the new 8545-01 has also been upgraded, using new leads, no longer mold failure, and the use of new glue in the elastic wave, folding ring and other bonding, high temperature, high humidity environment, Make sure you work better!
In addition to the above upgrade measures, some of the original features of the old model have also been retained, such as the patented SD-1 magnetic circuit, the diaphragm uses carbon fiber mixed air dried paper cone as raw materials and so on. In the end, the sound performance is that it retains the style of the old 8545 unit, which is easy, relaxed and atmospheric, and improves the transparency, detail and exquisiteness of the fans.
If you want to add a description to the new 8545-01 unit, I think it should be "natural", adding nature to the original features!
In summary, the new 8545-01 is a mid-woofer unit that is suitable for a limited budget and wants to experience high-quality sound. It is worth a try.
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