Link to parts of this video:
- Characteristics and objectives of the 4:19 project
- Models from the QC-x0x range that use the same 7:14 technology
- How Quasar's PULSAR SYSTEMS works 10:23
- How a speaker works 11:06
- How an acoustic suspension box works (sealed box) 15:39
- Constructive details of our prototype 18:29
- How our prototype was built 21:03
- Frequency response test (white noise) 24:59
- Listening test with music 26:28
- Final thoughts 32:09
- The boxes at your workplace (with music) 35:44

Link to previous speaker cloning video::
   • Será que dá certo clonar caixa acústi...  

Quasar QC-404 boxes were popular in the 1970s and 1980s. They are still in demand and used today, thus showing their value.

In this video we analyze this innovative model (for the time), and then we provide a complete project to recreate this box that could have several applications.
We show how the prototype was built and then we tested it in the lab and with music playback to see how it turned out.
In addition, we show how a loudspeaker works and some operating principles of a sound box, all this to understand how the PULSAR SYSTEM by Quasar works (probably), which was used in several boxes by the company, which are also shown in the video.