Inlow Sound Folded bass horn Well, there I am looking tired, but pleased that this project has reached completion. I began this quest when my brother, who is the drummer in his Christian rock band, PureFusion, proposed that I design and fabricate a bass horn for his band's PA system. Quarter Wavelength Loudspeaker Design Gallery. Shown below are some pictures of quarter wavelength loudspeaker designs that people have built. Some of these projects are direct copies of my designs while others are original designs generated using my MathCad worksheets.
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The design of the cabinet was inspired by cabs like this one shown atwww.decware.com Mine had to fit in the limited space of the back of the car but I still wanted it to shake everything. I have heard folded horn speakers before and I knew that they could do that.Folded Horn speakers work like a trumpet in that the sound comes out of an expanding tube/box. To make it fit into small spaces the tube can be folded. As long as the fold continues to get wider then it has a chance of working.
There are formulas for this but I didn’t/can’t use them.There are loads of these ideas on the net. A good place to start is - http://www.lowther.com.hk/aboutlowther.htm.
The arrows in this pic show the path of the sound from behind the speaker in a folded horn design. An added benefit of using these designs is that you get sound form both the front and the back of the speaker. This means that less power is needed because the speaker is not compressing air in cabinet (to only produce heat) as a normal speaker does. All the energy is used to make sound, so you get about twice- ish the loudness you would get normally! Perfection.Another bonus is that because the speaker is moving freely it sounds clearer, more detailed. Sound seems to travel further, like it is all around you, especially the bass.
The only down side is that the speaker cone can travel beyond its limits if pushed too hard. But the vibe speakers I have are unlikely to do that with the limited amp I have.Only bass comes out of the horn part of the speaker. More than you would think possible.
Horn speakers are brilliant.No subwoofer will be necessary. The bass that I will get from these two speaker will out perform most of the closed box/ported subs I have heard, and with only 200 watts (these speakers will be very efficient in a folded horn design, a thousand watts are not needed).This built speaker from the net shows the inside and outside, you can see how the internal port gradually gets bigger. Speaker SimulatorsI didn’t use any of the simulators available on the net (for free) because I couldn’t be bothered to work out how to use them, and also with past experience folded horn speakers have all worked well so far.
I’ve made 2 sets for the house in different rooms and one large pair (6 foot tall) for the band I play in.This is it for the car.Next I had to make sure that it fitted in the boot so precise measurements were taken and clearances were added. It would need to be tilted into the boot space.
A cover will be added so that isn’t possible to see it was there. A true folded horn (which this is not) or transmission line acts like an acoustical filter and filters out much of the high frequencies. Fibre fill, and the like is not used to absorb high frequencies, but to reduce internal reflections.
Some theory suggests that fill in an enclosure design as suggested would actually ruin the way the acoustics work. Also there would be no 'loss of stereo separation' here, since low frequencies are omnidirectional, and quite long, which goes along with the acoustic filter that I mentioned already. The stereo separation effect that our minds recognize come from much higher frequencies than what would be passed through an enclosure design like this, from the back wave of the speaker.