One thing in advance: The CBT-37 is definitely worth its money. However, you also have to buy an appropriate quantity. In order to support the feedback a bit, I would like to return here the results of my spatial measurements before and after in figures and hope not to confuse too much. In any case, the CBT-37 worked like a miracle diet on my waterfall diagram or the reverberation times of the room.
My room measures about 12 square meters and is equipped with two A7X and a freshly acquired Sub8. In the heights and centers I have prepared the room decently, which is why the reverberation times down to 1kHz the 140ms mark does not exceed. In the bass range, however, it looked quite different. At 500Hz the reverberation has already doubled to 280ms, under 200Hz the values ??are even up to 350ms. That is why I wanted to do something for the acoustics.
At first somewhat skeptical, whether I am with the CBT-37 probably s.der wrong end, I have nevertheless nevertheless to the things to try. The price was just too tempting. So I ordered 6 packs and the 12 absorbers in my four rooms.
The investment has definitely paid off. Where the reverberation times previously were 140ms (at 1kHz) to 350ms (at 200Hz), the reverberation now runs almost linearly at 140ms. Only under 200Hz, the reverberation times rise again to 250 (from 140Hz downwards), which is however still a very good value, it was before the 350Hz. Only when it should go down, the foam reaches its limits.
The only real leftover, which is still hard is a room mode at around 50Hz, which is however not to be combusted with such absorbers and according to other means required.
Conclusion: I am satisfied with the product. Especially at this price. The only drawback is the fact that absorbers from different packagings do not entirely match the material brightness. But with a bit change and try out one gets then nevertheless so that it fits also for the eye. In view of the performance but Peanuts.
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The delivery was as usual prompt. I have a set in my Kellerheimstudio (consisting of 2 offset square rooms with parallel walls about 45 square meters) reingeklebt. And a clearly audible difference with it. I have not yet measured it since it fits audibly now. Since the room has 7 internal corners, I have 2 more Basstraps re-ordered. In addition, I have 3 DIY bass absorbers (ca 200x100x20cm) to 80Hz. The room modes through the basses are now gone, you can turn louder without it becoming unpleasant and the highs sound much finer. The natural (room) hall is now switched off. The monoboxes sound a class better and also the instruments. I even go as far as to call the set as "space instrument". I have achieved a good result with relatively little effort. Above all, the stuff can be removed without residue by means of a spatula (eg for rented rooms).
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