Smartphone Passive Speaker Acoustic Horn Amplifier NMP-011C

The NMP-011 "Amplifier" is a passive smartphone speaker that works simply by inserting your smartphone into the top slot. Since it requires no power source and amplifies sound using the resonance of its 3-layer horn structure, it is perfect not only for outdoors and garages but also for enjoying music while cleaning or cooking where power outlets are out of reach. Audio from your smartphone's music or radio apps travels through the internal tube, reflex, and horn mechanisms. This resonance amplifies the sound, giving it a rich, nostalgic quality. Designed as a reflex-type horn speaker—a type often used for public address systems due to its excellent sound pressure—the horn section is crafted from a round aluminum plate spun into a conical shape. The design adopts the structure of general commercial horn speakers found in factories and public broadcasting sites. To complement the inorganic presence and texture unique to industrial-grade equipment, we adopted a restrained, neutral coloring. We hope you enjoy the unique form, texture, weight, and atmosphere of this amplifier, and that it becomes a long-lasting partner in your daily life. Measurements were conducted in an anechoic chamber for acoustic testing to ensure no influence from ambient noise or reflections. To ensure consistent amplification, the arithmetic mean was calculated from four frequencies using a single-frequency sine wave, achieving an amplification performance of over +10 decibels. **2022 Osaka Made Brand Certified Product** *What is the Osaka Made Brand?* A system where the Governor of Osaka Prefecture certifies products that are full of creativity and backed by the superior technology of small and medium-sized manufacturing enterprises within the prefecture. ■ Specifications Material: Horn - Aluminum / Case - Cast Aluminum / Bracket - Steel Plate Finish: Munsell N9.5 semi-gloss approximate color (White) Dimensions: Aperture: φ160mm ±2mm Depth: 178mm ±2mm Height: 165mm ±2mm Weight: 460g ±10% Accessories: Instruction Manual Stand Space (Compatible Smartphone Size): Width 78mm or less, Thickness 15mm or less. *If using a phone case, please ensure the total size including the cover fits within the 78 x 15mm stand space.