It is a first sound.

Basal condition + China plywood + FE103E

  This speaker was completed on total of the first of BS-8 and 2 both. When the speaker actually designed is seen, the number of sealing up like book shelf type (BS-) and floor type (F-), etc. and [basurefu] types is more abundant though Nagaoka [tetsuotokoshi] is strong the image of backing loading (D-) overwhelmingly. Small [basurefu] and sealing up will be able to be made abnormally easily for the person who is always making the one that the structure is as complex as the backing loading. Popularity is considerably high why in Nagaoka master's [basurefu] type speaker, and this BS-10 and BS-8 are seen acceptable also on the net.
  The unit was made to come to the height of the ear when about four concrete blocks (About one 5k) were first put, and it sat on the floor [betani] though it was a method of setting up the speaker. Height is about roughly 70 centimeters.
  For soundIn the comparison with BS-8, weight considerably shifts to a low region (It is a bass region of 100-200 rather than a low region), and any source is digested orthodox. It is understood that the sound is designed hardly obstructing obedient ringing [ppuri] of FE-103E. However, because the equivalent box ringing did to raise the sound pressure level, I thought whether I may put it of reinforcement a little more in the cabinet. It doesn't become a nature too much if it hears it by a small volume. By the way, BS-8 receives the impression that the limitation considerably attaches to the way of hearing and the source so that the sound pressure decrease happens from 200hz or less considerably intensely, and an inside bass that becomes the framework of the music reproduction is sacrificed considerably. On the other hand, the limitation in not the nose dive it but the smilingbroadly, the inside low region level high compared with BS-8, and listening to the source of the fall gradually decreases though a low region begins to fall into BS-10 for 400hz.

BS-10