It was created as a super tweeter to add to existing speaker units. This speaker assembly is a homemade product. Compared to commercially available products, there may be some unevenness in the finish and scratches in the details, but each item is carefully crafted. All items have been listened to and confirmed to be working properly. [Speaker unit] Piezo horn type super tweeter Frequency: 5-20KHz Sensitivity: 91dB Maximum power: 150W The tweeter is made of ABS resin, but the transmitter and horn are reinforced with lead plates to prevent deterioration of sound quality due to resonance, etc. After installation, a Mitchacron primer and black paint are applied to prevent direct contact with lead. ●This has resulted in a significant improvement in the sound quality of high frequencies, and the high sound pressure level, which is a characteristic of the piezo system, has also been improved by cutting the low frequencies with a film capacitor, and I feel that the performance is sufficient at this level during listening tests. (This is my personal opinion, and there is no guarantee that the same results will be achieved with your system.) [Assembly body] 2 units in 1 set (no left/right specification) The speaker unit is assembled using acacia laminated wood. Place it on top of your existing speakers. A connection cable is included so you can use it immediately with your system. Please refer to the photo for connection instructions. Acacia wood finish: Briwax Natural Brown finish. Pre-installed film capacitor: 400V, capacitance: 1.0μF I listened to it on my full-range speakers and was very pleased with the results. I felt the treble had more luster and extension, and strangely enough, the bass also seemed to expand. However, we cannot guarantee that the same effect will be achieved depending on the system you are using. My PC desktop audio listening environment is as follows. ・SP unit: Fostex FF105WK (10cm full-range) Enclosure: Fostex BK105WB2 ・External dimensions per unit (approximate) Length 15cm x Width 8.5cm x Height 11cm 【others】 Accessories: Connection cable: Total length approx. 80cm