TOA Sound System in Bangladesh:
Improved product quality:
Phenol’s susceptibility to humidity makes it vulnerable to post-fabrication deformation of the dome shape, a flaw which can lead to friction between voice coil and magnet and eventual diaphragm damage. For this reason, we switched to polyimide that is more resistant to moisture than phenol.
Improved productivity:
While phenol-impregnated Conex requires about a month of curing time before the diaphragm becomes usable, this process is unnecessary with polyimide, and the finished product is ready for actual use just two minutes after formation. The adoption of polyimide therefore greatly improved productivity.
Improved low frequency characteristics:
Polyimide is made of softer materials than phenol-impregnated Conex. Generally, the more pliable the diaphragm material, the more suited it is to generating sounds in the lower frequency ranges. Therefore, our adoption of polyimide has allowed the production of sound offering a “thicker,” more “solid” impression than previously available in horn speakers.
Divided vibration and high frequency drop characteristics:
The poor high range characteristics of horn speaker driver units result from
the fact that the dome-type construction makes it more likely for divided
vibrations to occur. “Divided vibrations” refers to the various vibrations
occurring within the diaphragm when it does not vibrate in a uniform manner. When certain surfaces within the dome surface are vibrating in opposition to other surfaces on the diaphragm, the speaker will have difficulty sending out a clear sound.
This phenomenon occurs most conspicuously from a certain frequency up through the high ranges. The relative softness of polyimide materials renders them more vulnerable to such divided vibrations. Improving the high frequencies against this problem is a subject for efforts going forward.
Ring-type diaphragms are used in tweeters employed in large-scale sound reinforcement systems and in the pure audio field. TOA has been attempting to use these in full-range (wide reproduction frequency band) applications.
Improved high frequency characteristics:
Since ring-type diaphragms have a more symmetrical construction than
dome-type ones, divided vibrations are less likely to occur, and therefore they are a good candidate for extending reproducible frequency toward the high ranges.
The diagram shows the differences in vibration between dome and ring diaphragms, low frequency vibration on the left, high frequency vibration on
the right. Here we see reverse vibrations (red) occurring in the dome diaphragm at the higher frequency, whereas the ring diaphragm is relatively free of these and provides almost uniform vibration.
TOA Sound System in BD:
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Latest Update TOA Sound System in Bangladesh 2021:
Amplifier
Type
Model
Watts
Latest Price
Amplifier
A-2030
30 Watts
              12,000.00
Amplifier
A-2060
60 Watts
              15,000.00
Amplifier
A-2120
120 Watts
              22,000.00
Amplifier
A-2240
240 Watts
              42,000.00
Amplifier
A-1724
240 Watts
              45,000.00
Amplifier
A-1360SS
360 Watts
              84,000.00
Amplifier
A-1360MK2
360 Watts
              84,000.00
Speaker
<a class="wpil_keyword_link" href="https://www.pasystembd.com/product-category/ceiling-speaker-bangladesh/" title="<a class="wpil_keyword_link" href="https://www.pasystembd.com/product-category/ceiling-speaker-bangladesh/" title="Ceiling Speaker“>Ceiling Speaker“>Ceiling Speaker
PC-648
6 Watts
                1,500.00
Ceiling Speaker
PC-658
6 Watts
                1,600.00
Ceiling Speaker
PC-2852
10 Watts
                3,500.00
<a class="wpil_keyword_link" href="https://www.pasystembd.com/product-category/column-speaker/" title="<a class="wpil_keyword_link" href="https://www.pasystembd.com/product-category/column-speaker/" title="<a class="wpil_keyword_link" href="https://www.pasystembd.com/product-category/column-speaker/" title="<a class="wpil_keyword_link" href="https://www.pasystembd.com/product-category/column-speaker/" title="Column Speaker“>Column Speaker“>Column Speaker“>Column Speaker“>Column Speaker
TZ-105
10 Watts
                5,000.00
Column Speaker
TZ-205
20 Watts
                8,000.00
Column Speaker
TZ-106
10 Watts
                4,500.00
Column Speaker
TZ-206
20 Watts
                6,500.00
Column Speaker
TZ-406B
40 Watts
              11,500.00
Horn Speaker
SC-615
15 Watts
                4,500.00
Horn Speaker
SC-630
30 Watts
                7,000.00
Horn Speaker
TC-631M
30 Watts
                8,800.00
Horn Speaker
SC-651M
50 Watts
                9,800.00
Horn Speaker
TU-652
50 Watts
                3,500.00
Horn Speaker
TU-652M
50 Watts
                6,500.00