Refined Engineering Behind the K4 Full-Range Speaker Driver
Though the K4’s 4-inch driver may resemble other brands in appearance, Lotton Electronics has implemented a series of internal enhancements specifically for this model. From the thickness and material selection of the diaphragm, to the unique suspension edge and the surrounding aluminum frame, every element is precisely crafted. Additional reinforcements include a metal cover surrounding the magnet and an increase in screw mounting points—now totaling eight. These upgrades serve not only aesthetic purposes but are carefully engineered to optimize the driver’s performance and stability.
At Lotton Electronics, we understand the high expectations of Taiwan’s audiophile community. Even after these enhancements, we questioned whether further improvements could be made. After extensive listening sessions, we discovered that further refinement in specific frequency ranges could deliver a purer sonic presentation. This led us to re-engineer the internal wiring from the speaker terminals to the driver unit.
We ultimately selected a premium Japanese-made OFC (Oxygen-Free Copper) wire. Unlike the fine, generic copper strands commonly used in consumer-grade products, this wire features fewer but thicker strands for better signal transmission. Moreover, the copper conductors are coated with both gold and silver—materials typically found only in high-end audiophile cables that, in some cases, cost more than the K4 itself. This upgrade places the internal wiring of the K4 on par with dedicated audiophile-grade components.
The result is a sound that is noticeably purer and more transparent. High frequencies are smooth and detailed without harshness. The quality cabling allows electric current to flow more freely, enhancing not only the highs and mids but also providing tighter, faster response in the mid-bass range.
We also paid close attention to the speaker terminals. After testing many of the same models used in top-tier hi-fi equipment, we selected the version that best complements the K4. It supports Y-terminals, banana plugs, and bare wires. This is the same terminal type found on many high-end amplifiers. Its stability and minimal signal coloration made it the clear choice over some higher-priced options that showed no real sonic advantage in testing.
All of this—the cabinet, driver, internal wiring, and terminals—works together like an elite team with no weak links. Only with such a synergy of thoughtful design and carefully selected materials can the true sound of the Lotton K4 be realized.
When paired with our own tube amplifiers, the K4 becomes a showcase in itself. Even when powered by ordinary source components at audio exhibitions, the combination of Lotton’s tube amp and K4 speakers frequently attracts a full room of listeners. Especially with female vocals and small ensemble recordings, the sound is warm, natural, and rich with detail. Every nuance—from instrumental textures and recording finesse to the subtleties of a singer’s vocal technique—is presented with clarity and authenticity.
We are not exaggerating when we say that many systems on display costing three times as much fail to match the performance of our setup.
Since 2018, we have used Norwegian singer Anette Askvik’s single “Liberty” as our reference demo track in exhibitions. Interestingly, Anette was chosen as the musical ambassador for the final Munich High-End Audio Show, where “Liberty” became the signature track. Coincidentally, we and fellow audiophile distributor Ai Le Audio began playing this track at shows, and it gradually became a beloved reference within the audio community—almost a national anthem of audio shows.
To put it simply: within a comparable budget range, few systems can rival the combination of Lotton’s tube amplifier and the K4. Outperforming Lotton? That's a tall order—even for Tom Cruise.
This is the result of Taiwanese dedication, craftsmanship, and relentless pursuit of excellence.
With the Lotton tube amplifier paired with the K4, listeners will rediscover the depth and intricacy embedded in every note of “Liberty.” From the tonal layering of instruments to the resolution of the vocals, it becomes clear why this track was selected for the final Munich High-End Audio Show.