Right side photo shows relatively large 4 way system with 4 power amplfifiers
and a electronic frequecy divider. The speaker system consists of a 46cm
(Dia.) woofer, a 25cm Mid-Bass Horn, a 5cm driver with a Mid Horn and a
2.5cm tweeter Horn in one side of the system.
In this system, different types of speaker drivers are included such as
the horn drivers and the direct radiator speaker driver. It is very difficult
to draw all the characteristics of each speaker even if each reproduces
high quality sound.
There may have mis-matching questions including phase, time, gain, location
and others among speakers.
One of the best solution is to use a electronic frequency divider. However,
how to tune the sytem is still hard work. The details of adjustment procedure
is discussed in detail.
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The photo is 2 way 38cm (dia.) direct radiator woofer and 5cm throat Horn
driver system with A-290 Horn. You can see the details of the enclosure
named as E-170. The Horn used above 4 way system is almost identical to
the one used here. Cutt-off frequescy of those Horns are about 300 Hz.
The combination of the direct radiator driver and the horn driver have
fundamental problem. Which induces time defference from two sound sources
to the listener.
In this system, traditional 12dB/oct passive filter is used. Unfortunately
above timing question can not be resolved in the system but other factors
are optimized. The cross over frequency is set as 600Hz in this system.
The details are discussed in the page.
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This system is relatively small one. The woofer driver is 17cm (dia.) size
and the tweeter is also direct radiator type. A 6dB/oct passive filter
is used in a system
The tweeter on the cabinet is flexible to relocate its position. Very fortunately
the gain of those speakers is almost identical, so, attenuator can be eliminated.
The cut-off frequency is set as 8000Hz. The tweeter driver is mounted in
the unique wooden block to optimize sound field disturbance mainly in its
front space.
How to adjust the system and related data are shown in the page. |
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| System Model |
Speakers |
Woofer
Size(D) |
Amplifiers |
Frequency Divider |
Link |
| 4-Channel-System |
x 4 |
46cm |
x 4 |
Electronic Filter |
4 Channel System |
| 2Way-Horn-System |
x 2 |
38cm |
x 1 |
Passive Filter |
2 Way Horn System |
| 2Way-Speakers-System |
x 2 |
17cm |
x 1 |
Passive Filter |
2 Way System |
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Yellowstone National Park, WY USA (Photo by Yuichi) |
