Appearance and function match the final product, but is made with different manufacturing methods.

Looks like the final product, but is not functional.

Demonstrates the functionality of the final product, but looks different.

A prototype is a preliminary model of something. Projects that offer physical products need to show backers documentation of a working prototype. This gallery features photos, videos, and other visual documentation that will give backers a sense of what’s been accomplished so far and what’s left to do. Though the development process can vary for each project, these are the stages we typically see:



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Why do you want to upgrade your subwoofer?

Most soundbars and 2.1 sound systems come with small size, low-powered subwoofers.

But there is no simple upgrade ...

It is not easy to just simply replace the integrated subwoofer with a new one in a 2.1 or a soundbar system. It may be because the subwoofer is built in the multi-channel amplifier, it is using proprietary wireless connection, etc. Even having a physical wired connection to the subwoofer, there still have problems arising from the active or passive type connection, problems in matching (the cross-over and the phase differences) among stereo loudspeakers, etc. Then how can you make your decision when upgrading your sound system? Well, you need to study many cases and that can be complicated for choosing your new subwoofer. That is why many users decide to buy a new expensive set instead of using the upgrade approach.

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What are the advantages of using the Subwoofer Gadget?

Make your subwoofer much louder

Alleviate the narrow frequency response (thump or mono-tone) of your subwoofer to delivery detail, deeper, dynamic bass tone

Make the low frequency effect (LFE) sound audibly from the stereo loudspeakers rather than the subwoofer (subwoofer-move-in effect)

Overcome the subwoofer delay caused by wireless connection or a distance placement



How to make the subwoofer sound louder?

We use our patented method to reproduce the sound with multi-tone. For example, suppose the subwoofer is going to sound a pitch C1, the Gadget will generate additional pitches C2, C3, .etc.

Pitch C in Piano Keyboard Sounds Music Note "Do"

These additional pitches have similar tone as C1 and have the same auditory perception on music note "Do". In such condition, our brain will interpret the multi-tone as the pitch C1. Eventually, the perceptive energy of the multi-tone makes the subwoofer sound louder than its actual and physical capability can deliver.

The Loudness Image of the Perceptive Pitch C2 and C3



How to make lower bass tone?

The additional pitches are making the subwoofer sound louder. This approach also makes its lower bass tone down from 80Hz become perceptive louder and audible. If you want to preview this technology, you can download the early developed app at this link to experience the lower bass in a pair of small earpieces.



How to make the subwoofer sound move in and conceal its lag/delay?

The Subwoofer Gadget supports the precedence effect (aka Haas effect). The precedence effect describes the human's ability to identify the sound localization under the condition of the multi-path reflection, e.g. in a room. Human will capture the first arrived sound as the source location and neglect the late reflective sounds from the same source.

Sound Location in Room Reflection

Somehow, modern sound system design always emphasizes the bass response of the subwoofer because human cannot find the direction at low bass frequency sound and expects the subwoofer will reinforce the bass response of the stereo loudspeakers. In fact, the sound around the cross-over cut-off frequency between 250 and 150Hz is moderately audible and enables human to find that the sound is coming from the subwoofer instead of the stereo loudspeakers.

Without Subwoofer Gadget

To overcome this problem, the Subwoofer Gadget will also enhance the bass response of the stereo loudspeakers. In general situation, if user sitting close to the stereo loudspeakers will firstly hear the low bass frequency coming from the stereo loudspeakers instead of the subwoofer so that the precedence effect is working to move the subwoofer sound in to enforce the stereo loudspeakers. In other words, we are regarding the subwoofer sound as the late (or delay) reflective sounds.

With Subwoofer Gadget

Hardware and Software Integration

The following diagram shows a two main chips solution located at the back side of the PCB. The A/D-D/A conversion chip converts the analog signals into the digital signals and then the processor takes these signals and implements the signal processing, after that the processed digital signals will convert from digital to analog signals by the conversion chip as the output of the Subwoofer Gadget.

Hardware and softeare integration

How to install the Subwoofer Gadget?

The following video shows you how easy to install the Gadget in your audio system.

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Please follow the following three steps to setup the volumes:

1. Turn up the volume of the amplifier to a moderate and comfortable listening level (e.g. 30% of the maximum level).

2. Play some musics and turn up the TV/PC volume close to its maximum level until the sound starts to distort, if any.

3. If subwoofer's volume is adjustable, adjust the volume to a desirable level. Remind that the volume of the subwoofer should always be turned lower when used with Subwoofer Gadget.



Using these samples to preview the effects on your sound system which has the subwoofer installed

The sound track of the videos are recorded at the output of the Subwoofer Gadget. Simply play back the video with your PC or mobile phone and connect its headphone's output to your amplifier so that you can experience the sound effects like that your system is installed with the Gadget.

To obtain optimal bass enhancement, please make sure you have used the above 3 steps to adjust the volumes and the link here is the original clip just for your reference.

https://vimeo.com/219362992

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https://vimeo.com/219370708

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Questions:

1. Can I use Subwoofer Gadget in my stereo system without a subwoofer installed?

Answer: Yes, you can hear the system sound louder and perceive the deeper in the bass.

2. Can I use a headphone with Subwoofer Gadget for my PC game?

Answer: Yes, you can. We also recommend to use a headphone as an audio signal tracing tool if there is a problem in the audio cable connections.

3. What is the requirement for hearing the subwoofer-move-in effect?

Answer: The diameter of the diaphragms of the stereo loudspeakers should be larger than 1.5 inches. Please check it whether you can hear the effect with your sound systems by using the provided video samples.

4. Is stereo or mono of the subwoofer-move-in effect?

Answer: It is stereo provided that the input signal is stereo.

5. What is the test switch used for?

Answer: The effect of the Subwoofer Gadget is always enabled when powered on. The test switch is used to turn on and off the effect so that you can make a comparison easily.

6. Why and when I need to turn down the volume of the subwoofer?

Answer: The Gadget always makes the subwoofer sound louder and this may mask the sound from the stereo loudspeakers. In case of any sound level imbalance between the subwoofer and the stereo loudspeakers, you can simply turn down the volume of the subwoofer to recover the balance again. By the way, the level balance/matching is important to produce the subwoofer-move-in effect because the first wave-front (the first arriving sound) of the audible bass sound from the stereo loudspeakers is the necessary condition for the effect.

7. If I turn down the subwoofer's volume to keep the balance mentioned in 6, will the same loudness be delivered as if the gadget has not been installed?

Answer: Since the Gadget also enhances the bass of the stereo loudspeakers, the audio system with the Gadget installed is surely enabled to delivery louder, richer and deeper bass after the level matching between the subwoofer and the stereo loudspeakers.



Mentioned Documents

The invention patent

FCC Certification

Thanks your supports

We need your support to meet the minimum order quantity requirement so that the production cost of the Subwoofer Gadget will be in a reasonable level.