Subwoofer on Magnat speaker. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Subwoofer on Magnat speaker. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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The history of this speaker began a long time ago. Magnat Power Bull Reflex 301 came to me from the hands of a friend for whom it stopped working. Having given it to me, he said that if I fixed it, I could keep it, which is exactly what happened. This is where my intense passion for car audio began. First, I made a bass-reflex housing of approximately 44 liters with a 95mm x 100mm bass reflex housing for it and made it so that it would fit in the trunk of a VAZ 21053, taking into account the protrusion under the rear parcel shelf.

Of course, the body had many sharp protrusions inside, which affected the sound. He mumbled madly, but then I didn’t listen to anything powerful except Soviet AC-90s and I calmly enjoyed decent bass in the car. Then the VAZik was gone, and I switched to a Peugeot 605, so the body had to be redone. That’s when I started crawling on the Internet in search of information on making cases. I came across various programs for calculating hulls, but I settled on only one - WinISD beta 0.44.

Subwoofer on Magnat speaker

However, this was not the case. I knew almost nothing about speakers. Again, persistent searches on the Internet for the necessary information led me to an article about independent measurement and calculation of loudspeaker parameters. Stubbornly following the “instructions” for measuring parameters, I encountered another problem: my tester does not measure alternating voltage less than 1V, and there a sensitivity of 100mV is needed. Already pretty tortured, I again continued searching for parameters on the Internet. After browsing through several online stores, hoping to find what I needed, I suddenly realized that I had wasted a lot of time! After all, there should be an official website of the manufacturer! A short search led me to the right site. There I found the necessary information, but not all that I wanted. The manufacturer posted only the following parameters on the website: Fs=33hz Vas=82l Qts=0,52 R=4Ohm SPL=92dB PE=300W.

Subwoofer on Magnat speaker

However, even with these parameters, the program offered me a 189,5 liter case in a bass reflex housing, which did not suit me very much!!! However, I decided to experiment and assemble a closed housing of 96,6 liters, proposed by the same program. Having assembled the case, I barely put it into the trunk and hoped to pleasantly surprise myself with the sound... but that was not the case! The sound, of course, was pleasant and melodic, but it was as if the amplifier had been replaced with a less powerful one.

Without hesitation, I decided to return to the program and calculate the bass reflex for this case. What happened was the following: the bass reflex tuning frequency was 21hz, and I decided to make the bass reflex rectangular, 16 cm x 3 cm and 26,2 cm long, which suited me. It turned out that this body began to play much better and more pleasantly. But since I’m young and we often gather outside to relax and listen to music, I needed good bass outside with the trunk open, and that’s where I was inspired to make another experimental bass-reflex enclosure with a volume of 30 liters and a tuning frequency of 25Hz . It didn't play very nicely and didn't have as much volume when I placed it against the back of the seat. I decided to experiment with the position of the subwoofer in the trunk and found out that the difference in sound and pressure is very big. The best place turned out to be in the corner near the rear lights and with the bass reflex pointing up. I liked the sound, but I felt that it was not what I needed.

Subwoofer on Magnat speaker

Here I assembled the next case with a volume of 54 liters and tuned it to a frequency of 48Hz. The material used was 16mm chipboard, purchased at the nearest market. Based on the dimensions of the trunk, the body had the following dimensions: length 77,8 cm, width 25 cm, height 36,5 cm. A phase inverter with a diameter of 9,5 cm and a length of 10 cm was purchased at the Mytishchi radio market. I covered the inside walls with 2mm insulation (I couldn’t find anything else in the garage, but it was too much to buy, since there was a lot of insulation and I didn’t mind) and reinforced it with three spacers.

I didn’t bother with tightening it up and smoothing out any unevenness, because I was doing it for myself, and just painted it with black wood paint. Having placed it in the trunk, I was glad that everything turned out as it should, almost, then I finally peeled off the insulation and everything fell into place. The bass was elastic and did not put pressure on the ears, and almost all musical genres were played pleasantly, mainly Rap, and it was pleasant to listen to it on the street. This is where I stopped (But I intuitively guess that after purchasing a sensitive voltmeter, I will still change the design).

Subwoofer on Magnat speaker

Author: Sani; Publication: cxem.net

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