Analysis of frequency response

Basal condition + China plywood + FE168SS

The following have been understood from the frequency response table after it measures it after D-37 is completed.

The sound pressure level of the total is 74db. It is ..1db.. lower than super-Swan.
The average sound pressure level of the convex region is assumed to be 55db and the �}10db63hz-20khz is an effect bandwidth.
The graph changes to the level-off in the characteristic of the [modara] fall in a low region near 20db in the convex region since 63hz.
The sound pressure decrease starts from 10khz in a high region and it decreases from the convex region in 10db in 20khz.

  About one. It was felt that it was lower on the audibility though only 1db of the total sound pressure level on the audibility was lower than that of super-Swan. D-37 has weight in low region or more though the sound pressure of super-Swan in the convex region is the main, and it listens and I think the lowest region in the part to be [dearu] from [koenikui] in man's ear.

  About two. The effect bandwidth of this speaker said in the catalog though it is a numerical value so not significant (Though it becomes my room [komino] characteristic).

  About three. Here is important. The keep does the sound pressure though it manages to be D-37 and to be [hadarasagari] though the band for 25hz, 31.5hz, 40hz, and each 50hz hardly goes out for ten-centimeter unit etc. (It goes out actually and it is not possible to perceive it by the ear between [rugamohotondo] [nin]). This is [nantokawakaru] level on the audibility.

  About four. Here is also important. Thereat, a low region actually feels that it is wide and the sound pressure of a high region is considerably low probably because of there as for a high region though getting depressed seems not to be too intense (Though it installs from the convex region average on 10db). I will confirm the addition of the tweeter to which the boost is done with the amplifier by the following experiment.

D-37