Hhhhhhhhhh, this title was written because it was the first intuitive experience when you saw this thing, and it was good for getting the square to go with the aunt pk artifact, Jun Wu Dreamwave's TREMOR outdoor Bluetooth stereo.
This box was used to go out with friends, and they brought it along. Because it was very curious, I would simply take a photo and then leave it at that.
Maybe the picture doesn't feel much, but the physical box is quite big. The specific size is equivalent to a traditional standard-sized cassette recorder. It's a standard double-speaker type. For 90s friends, it might not mean much, but for those from earlier times, there's definitely a concept. Of course, I was also curious to ask why my friend would buy such a large box. It turned out to be pretty simple: this box is used for outdoor activities like playing games or team-building events. It's not portable, so aside from really buying a big horn for a plaza, few options are available (other high-power Bluetooth boxes from big brands are more suited for indoor use). That’s why they chose this TREMOR from Jun Wu Dreamwave.
Originally, I thought the product was just big, but after checking online, I found that there are more specifications in the family. Some smaller versions are more portable for daily use, and the design is basically in an American outdoor style. However, the overall look is mature, though it's actually a fancy model with just two small dots.
Since I've been using the box for a while, I'll introduce its appearance and accessories (some may be missing). The standard package includes an external power supply, a 3.5mm audio cable, and instructions. But since it's been used for some time, the accessories given by my friend are probably what they usually use.
Design
This speaker left me with the deepest impression, not only because of its huge size and weight, but also due to its appearance. After years of development in the Bluetooth speaker market, various design styles have been explored to the extreme, making it hard to find breakthroughs. However, the American outdoor military-style design of Jun Wu Dreamwave's TREMOR stands out, even if it looks a bit rough.
The design is positioned for outdoor use, so the materials, panels, buttons, and even the fabric are all set up in an outdoor style, without any extra decorations, focusing on simplicity and function.
The top has "simple and brutal" button settings, reminiscent of devices from the cassette machine era—clear and straightforward. Even the power button is simple: just click to turn on, and another click to shut down. No need for long-press or other complicated operations.
A transparent mesh allows you to see the audio units. Without disassembling, the official specs mention about 6 audio units: two full-range, two high-frequency, and two passive low-frequency drivers. The power reaches 50W, which is quite strong for a mobile speaker, and the built-in battery is large.
Side vent holes 
Used to move the design of the canvas 
The rear IO port has a power port, a USB port, and a 3.5mm audio port. The USB port can charge mobile devices, and this speaker has a 20800mAh battery, making it also a power bank. It outputs 5V 1A. The interface on top is wrapped in rubber to achieve IPX5 waterproof rating.
There's NFC on top, but despite years of hype, it's still underused. The large one-piece button on top is covered by plastic for waterproofing.
Compared to other Bluetooth speakers that tend to be smooth and delicate, this one is obviously more rugged, with lots of textures and bold lines. My friend accidentally dropped it in the car trunk (personal advice: it's heavy), so it's not uncommon to have some bumps. However, I personally feel that this box is too big. If I don't drive myself, I'm too lazy to carry it.
Experience
After covering the design, let's talk about the actual use of this box. I've tried many Bluetooth speakers, but I haven't touched the TREMOR before. After all, I didn't need to go to the square...
Square-level sound volume: Because of its large size, the TREMOR has a 50W power output. Although it's not as powerful as the square dance speakers that can reach hundreds of watts (which are often virtual standards), the open-air volume is still impressive for a portable speaker. On weekends, we went near the stadium (nobody was there) and measured the effective coverage. The volume reached about 10 meters, almost the size of a basketball court or tennis court. The "effective coverage" here refers to whether the sound is clear and has pressure in that area—not just being able to hear it, but feeling it. If it's just about hearing, the range could be wider.
Almost unavoidable sound directionality: In the current situation where there's no black technology, this single-source box can't avoid the problem of sound directionality, especially in outdoor settings. So in actual use, TREMOR still has this issue, and the bigger the sound, the more obvious it becomes. Many manufacturers claim to improve this with structures like circular upward designs, but the results are minimal. If you're not picky, you could consider buying two TREMOR 2.0 systems and placing them within a certain range to solve the sound directionality problem.
Similar to the appearance of the style of voice tuning: seeing the appearance of this speaker, I believe you'll think it's focused on low-frequency performance and a flexible style. The fact is mostly the same, but there are certainly differences.
Above 40% volume, the sound field and sound pressure performance of the TREMOR box will be at a more appropriate level. Too low and the sound isn't felt; too high and it won't break, but it feels low frequency. The power isn't enough. In the ideal volume range, TREMOR's three-band resolution is acceptable, but what surprises people is the mid-range performance, which is better than expected. The low frequencies are sufficient, creating a sense of surrounding, and the box doesn't feel like it's boiling. The first listening experience is like a speaker that emphasizes ambient effects.
The sound details are decent, but not overly transparent. High frequencies aren't the main focus, after all, this box isn't meant for instrumental music. Overall, the recognition is high, and it's resistant to fatigue. The low frequencies are due to the passive unit, so they’re not too intense. Overall, the sound quality of this box meets expectations. The final sound style is unexpected, but compared to square dance or social shaking boxes, the sound quality is significantly better. In short, it's clear, detailed, and not scattered in sound pressure.
Also, this box actually comes with a wireless microphone accessory, allowing you to blow up the street at any time. Friends were already ready to place orders.
As for battery life, well, I guess it's unpredictable. My friend said he charged it 1.2 months ago, and although it wasn’t used much, with a 20800mAh battery, the battery life is definitely good.
There's also a simple use of this box, and because it's simple, there's no app adaptation. Although I hate using boxes without apps, in this case, EQ and other settings have to rely on the player settings.
Final summary: Let me explain the pros and cons of this box.
Disadvantages:
1. The price is higher, over two thousand yuan.
2. It's a US brand, only introduced to the country a year or two ago, so brand awareness is low.
3. It's large and heavy.
4. Sound directionality is obvious, and high frequencies could be improved.
5. No suitable app, can't adjust EQ.
Advantages:
Outdoor speakers aren't rare, but this one is special. The design, craftsmanship, and sound performance are more reliable and clearly better than fortress boxes.
The last correct use of this box 
Ring Common Mode Inductor,UU Common Mode Inductor,Vertical Plug-in Common Mode Inductor,Power Line Common Mode Choke
Xuzhou Jiuli Electronics Co., Ltd , https://www.xzjiulielectronic.com