Subwoofer for 75GDN1-4, calculated in JBL SpeakerShop. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Speakers

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It all started with the 30GD-2 speaker offered to me, manufactured in 1988 for a small price. Before this proposal, I did not think about building a subwoofer. After checking and buying a speaker, I began to think about the device. To begin with, I learned to use the JBL SpeakerShop program, with which I calculated the subwoofer parameters.

I settled on the version with a phase inverter in a box with a volume of approximately 60-65 liters. Having made all the calculations, I would have to start sawing chipboard, but studying in grade 11 with attending courses did not give this opportunity. The project was shelved. After 3 months, I dug out a 2 cm thick laminated tree in my closet, which was the best fit for the subwoofer. The panels were sawn in a record time of 1 hour! And this is by hand with an ordinary hacksaw for wood

Thank you so much for helping my friend Archi. Then, within a few days, the first trial version of the subwoofer was assembled. It turned out that he was sorely lacking in rigidity, tk. the panels rattled, and that it had huge gaps, which was expressed in a terrible sniff.

At the time of the exams at the university, work was again curtailed. To strengthen the subwoofer, additional stiffening bars were sawn, and a sealant was placed on them so that the front and rear walls of the column would hermetically fall into place. The slots were plugged with plasticine, and then treated with mounting foam. The legs were screwed on. The phase inverter was made from a plumbing plastic pipe. After that, the sub played fine.

Author: Mikhail Lukichev, Ulyanovsk; Publication: cxem.net

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