Roland from Japan is a world-renowned musical instrument manufacturer with an absolute leading position in the electronic drum industry. In the field of electroacoustic instruments, the JC-120 guitar amp launched by Roland is also a classic product that will go down in history. In recent years, Roland has focused more on the digitalization and high compatibility of loudspeaker products, and has put a product line dedicated to electric guitars into its sub-brand Boss. By the way, Boss also has a leading position in the effects industry, especially in the comprehensive effects industry.

The JC-120 takes its name from "Jazz Chorus" and is inspired by the Fender Twin Reverb. This loudspeaker, which has been produced since 1975, has two 60W 12-inch speakers, and is loved by the public for its pure Clean Tone and unique stereo effect. The most powerful 120-watt version (Combo) sells for less than 7,000 yuan. With an affordable price and low maintenance costs, the JC-120 has become almost the standard for large-scale performance venues. However, due to design limitations, the JC series has excellent performance in clean tone and stereo sound, but it does not perform well in distortion tone, so it is not suitable for playing heavy genres such as rock and metal. At the same time, the JC series is also quite unfriendly to the effects, and often does not achieve the sound performance that the effects should have. Choosing the right hardware equipment according to the musical style and scene conditions is the knowledge that a qualified electric guitarist should have.

The JC series corresponds to the high-end/professional market, while for the mid-range market, Roland focuses on the transistor series Blue Cube. However, the series does not have much highlight at the price of 4000 yuan, and the number of preset functions and interfaces is not as good as the solid-state circuit speakers launched in recent years, so it is not recommended to choose. This is not to say that Roland has cut corners, as the company's R&D and marketing focus in recent years has been on the Boss Katana series.

Katana is the Japanese pronunciation of "knife", in fact, Boss put the "knife" word logo on the front of the speaker, so this series can also be called the knife series. The Knife Series is a shock bomb thrown by Boss in the entry-level Combo speaker market, which provides almost all the functions of digital circuit speakers at a low price, so it has become one of the most popular loudspeaker products in 2018 when it was launched. The digital knife series can be connected to a computer to adjust various values of the timbre on the software; Four sets of voices can be stored in the cabinet, and there are nearly 60 preset effects, from crisp Clean Tone to sharp distortion, and even emulating the sound of other instruments such as acoustic guitar and electric bass. Versions above 50W have a Power Control function, which ensures a full, highly dynamic feedback tone at lower powers. The 7W, battery-powered Katana Mini costs less than 700 yuan, while the largest and most versatile Katana 100/212 (dual 12-inch speakers) is also priced under 4,000 yuan. It can be expected that in the next two to three years, the Boss Katana series will be the most competitive digital analogue loudspeaker on the market.