In view of the fact that the 8545 is one of the earliest imported units of the author, and also contacted the new version of 8545-01, I have a little experience to introduce to you:
In fact, the official introduction still does not mention the application of the cabinet when the actual replacement. Because the cabinet is the biggest problem, it cannot be easily changed and redesigned.
Before the comparison, the TS parameters of the new and old 8545 units were tested. Since the forum uses the LSPCAD design box, for the sake of convenience, I will publish the parameters according to the LSPCAD format: 
There are still some discrepancies with the official parameters. It is still a mystery about consulting the official engineer in Denmark the previous year. However, from the actual test results, the parameters of the test are more in line with the objective test results.
The common volume of 8545 is from 14L to 20L. For the sake of compromise, the net volume of 17L is used for comparison. The other parameters such as phase inversion hole and filling ratio are the same. The simulation frequency response is as follows: 
From the perspective of frequency response, there is no problem with direct replacement of the two, and a relatively flat response can be obtained.
The impedance aspect is also basically suitable: 
The biggest difference is in the group delay: 
Group delays represent transients to some extent, and it is generally believed that group delays are lower and transients are better. The low-frequency transient of the old 8545-00 is quite common. From the comparison, the same box is just replaced with the new 8545-01 unit, and the group delay performance is better. This proves on the other side that the transient state of the new 8545-01 will be improved to some extent. (Don't expect too much improvement, it will be another unit, I think players who like the 8545 sound should not be satisfied.)
Afterwards, I compared the 14L, 18L, and 20L cabinets. The result is that the two can be replaced directly without having to adjust the cabinet. If there is really a need for adjustment, then these weak differences can also be achieved by adjusting the fill ratio of the sound absorbing material.
Finally, there are some views on this event:
The biggest benefit of this event should be that the old 8545 unit does not have to be sent back and can still be kept in hand. Since the activity is package express, if the old unit of the hand is sold for 500, 600, deducting the courier fee, the replacement price difference of 650 is almost negligible, basically free upgrade.
As for the label verification, there are many 8545 users in China. If the friends don't want to upgrade, they want to get the new 8545-01. It should be convenient to take a photo. This is a small loophole.
On the other hand, the old model 8545, no matter how good or bad, due to the choice of materials at that time, in the domestic environment, always face various types of aging failures such as lead and mold. The new material with new materials will not have such problems, and it can solve a big hidden danger.
Finally, from the sound point of view: the new 8545-01 did not lose the original sound color advantages due to the upgrade, the technical parameters also keep up with the times, is one of the good choices for this price speaker unit.
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