Hi everyone,
I'm quite new to speaker building; I did some projects based on existing plans. Now I'd like to modify one of the designs, to replace a standard rounded (plastic tube) bass-reflex with L-Shaped rectangular one. So, I've done some calculations in WinISD, got the required bass-reflex length.
Thanks for any help or links where to find more about L-Shaped bass-reflexes.
I'm quite new to speaker building; I did some projects based on existing plans. Now I'd like to modify one of the designs, to replace a standard rounded (plastic tube) bass-reflex with L-Shaped rectangular one. So, I've done some calculations in WinISD, got the required bass-reflex length.
- Shall the space used for the bass-reflex counted towards total box volume or not?
- What is the proper way to measure L-Shaped bass-reflex length (outer, inner edge or its average)?
- Shall the corner(s) be rounded?
- Shall be the bass reflex sound-insulated? Normal bass-reflexes has minimum contact with the chassis, but the L-shape bass-reflex is part of the chassis walls.
Thanks for any help or links where to find more about L-Shaped bass-reflexes.
1. No
2. Average of inner + outer length + some end correction. See Enclosure Ports – JL Audio Help Center - Search Articles
3. A big yes, round both inner and outer corner of the bend, otherwise it will chuff. Round the exits too.
4. What do you mean?
Another point: do not make the width / height ratio more than 9:1 as a high ratio will increase losses. Closer to 1:1 is better.
2. Average of inner + outer length + some end correction. See Enclosure Ports – JL Audio Help Center - Search Articles
3. A big yes, round both inner and outer corner of the bend, otherwise it will chuff. Round the exits too.
4. What do you mean?
Another point: do not make the width / height ratio more than 9:1 as a high ratio will increase losses. Closer to 1:1 is better.
Whether or not there are various effects depends on the size of the part in question. When the port is small compared to a wavelength at some frequency, the bend does nothing to the port, apart from affecting its overall resistance. On the other hand, high frequencies may bounce off the bend in more specific ways.
Similarly, the effect on where you place the inner end of the port depends on box modes and the wavelength in question.
To be honest, just try it and measure the effect and adjust if necessary.
Similarly, the effect on where you place the inner end of the port depends on box modes and the wavelength in question.
To be honest, just try it and measure the effect and adjust if necessary.
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