W3-1878 is a well performance and iconic 3” driver in TB Speaker products. The frequency response of this 3” full range driver is from 75 – 20K Hz with flat response curve.
The SUG1-01 enclosure design is back loaded horn design. The port of this design is built by internal wooden structure. Low frequency that generated by speaker driver can be extend and strengthen by this internal port design.
With this enclosure design, the FR can reach 60 – 20K Hz. In short words, it is very impressive, a small 3” enclosure can easily achieves this sound performance.