Yamamoto Sound Craft Large wood horn FA280A JBL/TAD type 2 inch 1

The FA280A has an external dimension of 806W × 330H × 513D and is a large horn as a wooden cutting horn. Conventional horns have narrow opening dimensions for cutoff frequencies, and most of them have decreased frequency responses at 1KHz or less. However, the cutoff frequency has been set higher than the opening area to improve that part.

In conventional horns, regular numbers of exponential horns were often used for the spread of horns, but in this method, the frequency characteristics near cutoff tended to fall. Therefore, using a hyperbolic horn curve, we succeeded in obtaining almost flat and wide frequency characteristics near the 280Hz of the cutoff frequency. In , by reviewing the horn spread normal number, it can be used from , which is 1.5 times the cutoff frequency.

F280A+TAD4001

F280A+JBL2445J

FA280AThe upper and lower plates are made by shaving out of the extremely large Asada cherry blossom block. One plate weighs about 40 kg. In addition, the side plate is also shaved from 62mm thick composite material, and nearly 100kg per unit is required for total. Since the raw wood is made into a plate-like material and it is made by laminating it, the material of the original raw wood needs nearly 250 kg per horn. This is the maximum as a wooden shaving horn, and because of the shaving out, there is almost no horn buzzing, and a clear playback sound released from the horn that was attached to a large horn is obtained.

In the F280A, the board material of the composite material is used vertically toward the front and rear direction with excellent sound transmission speed. Therefore, the sound spreads, and the sound release is good, and the sound is full of speed. In addition, the separator fins inside are in the sound path where they become thin and strong and weak. This machine uses very hard and durable African ebony material, and is assembled by cutting the mizo on the top and bottom plate and sandwiching the separator fin.

In order to follow the shape of a side-curved dayfraction horn with an internal separator fin, and to improve the orientation of the upper and lower directions, we designed the position where the upper and lower direction starts to open closer to the throat and gradually opens up from close to the throat. As a result, the vertical orientation can be controlled to a lower frequency, and as a result, the frequency characteristics can be improved in a mid-low range to achieve a more flat and smooth frequency characteristics.

The horn is to gradually increase the sound waves emanating from the driver unit inside the sound path and increase the volume in the process to determine the direction of the sound. Therefore, if there are obstacles inside the sound path or areas that are narrowed down, there will be a reflection of the sound and the sound will be disturbed. Since this machine does not perform dimensional comparison at any position inside the horn, there is no disturbance of the characteristics due to reflection, and it has obtained smooth characteristics as far as possible. The orientation of this machine has a moderate width orientation of 90 degrees horizontal × 40 degrees vertical. If the orientation of the horn is too wide, it is more susceptible to the reflection of the room. If it is too narrow, the direct sound from the horn tends to be strong and tight. The orientation of this machine has moderate orientation characteristics that are easy to hear in the general listening room.

The FA280A adopts a throat adapter made of artillery. The inner structure is only converted from a 49mm round with a length of 60mm to a 50mm × 60mm square. In the throat adapter, the sound wave spreads naturally to the horn and supports the connection between the driver and the horn. Gunnery is very strong in tin and copper alloys, and because it is heavy, it is less ringing and its sound is beautiful. It weighs about 4 kg with only the throat part. In this machine, we put a brace on the gun metal throat adapter and put a setting base on both sides of the horn so that it can support 3 points to stabilize when setting. Horns can also vary greatly depending on their setting. With the support of 3 points, the sound effects from vibration from the woolen unit are reduced and sound quality is improved.

* Designs, specifications and standards are subject to change without prior notice.