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What is JIS box?

  JIS box is a box that was able to be able to be provided according to JIS standard to measure the characteristic of the speaker unit. It is data that is put in this f special [hakono] JIS box and measured though f special [ga] has been described to the manual when a unit on the market is bought. (It is not data of a naked unit. )

  The one of data for this sealing up or more low regions can be earned in a lot of backing loading horn [basurefu] type speakers that man of the self-made sect uses. When the speaker is designed like this, the data measured in this this JIS box plays a constant role. However, it becomes impossible to disregard the influence of compliance in JIS box and there is a voice to throw the doubt on the measuring data, too, when becoming the unit of the large caliber too much.

  JIS box divides the one of the caliber 12 centimeters or more and for the small caliber unit less than it, and length * side * depth is provided 600*450*300(The content product is about 80L) by the one for 1200*900*600(The content product is about 600L) and the small caliber in the one for 12 centimeters as for the content product.

  The plywood of 21milli or more in thickness is used as for the material used for JIS box and the device to prevent [wohari], the reflected sound, and the standing wave with the acoustic material of 50milli or more in thickness is done as for the inside.