I know a professional speaker, HH.

HH(HH ELECTRONICS) Audio is a British local audio brand, which was founded by Mike Harrison in Cambridge in the late 1960s and is located in Midland Center in western England today.

HH Audio is a leading brand of power amplifier and audio system products, providing professional equipment for many musicians in Europe. All audio products are independently developed and designed by the company's R&D team, and they are excellent masters with profound experience in audio products. Since 1960s, HH is a typical British enterprise, which has created many excellent products and has been at the forefront of the audio product industry.