Improving the sound of 25AC-109. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Speakers
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The weakest link in the 25AC-109 (25AC-309) speaker system is the high-frequency head ZGD-31 (new name 5GDV-1-8), which does not allow you to get a clear sound from the entire speaker. You can significantly improve the sound quality by replacing this head with a more modern and powerful 6GDV-4-8, the flanges of both heads are the same, so the replacement does not require any additional alterations to the speaker cabinet and allows you to keep its appearance unchanged.
A new head is installed on the inside of the speaker front panel. To improve the sound of the 25AC-109, it is necessary to make some changes to the high-pass and mid-range filters. In the first of them, the resistance of the resistor R3 should be reduced from 5,1 to 3 ohms and the capacitances of the capacitors should be increased: C3 - from 2 to 3 microfarads and C4 - from 1 to 2 microfarads. In the second filter, it is recommended to remove the coil and reduce the resistance of the resistor R2 from 5,1 to 3 ohms, and connect the C20R4 circuit in parallel with the 8GDS5-4 mid-frequency head. In some batches of 25AC-109, there is no coil in the midrange filter. However, the alteration of such speakers is carried out according to the same methodology.
In order to equalize the frequency response of the mid-frequency head 20GDS-4-8 and reduce non-linear distortions, it is recommended to carry out acoustic damping of this head. To do this, the window of its diffuser holder should be sealed with synthetic felt, and the sealing box should be completely filled with sound-absorbing material.
After the described alteration, the sound of the 25AC-109 becomes cleaner and only slightly inferior to such well-known acoustic systems as the 35AC-012 (S-90).
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