I have been designing a very small multi entry horn to replace a 10" reflex portable speaker I built a few years ago.
My main goals have been to get the same low end extension but in a smaller size and not necessarily as loud using drivers I mostly already own.
The box is currently 30.4cm x 26.7cm x 34.1cm but I might make it a bit bigger to get a bit lower
The drivers I am using are:
Faital Pro 6fe100
Faital Pro 3fe25
Faital Pro HF100
I used ATH for the initial horn flare
To power it I am going to use The Sure Electronics Jab5 amplifier which has 4 channels so 2 for the bass drivers, 1 for the mid drivers and 1 for the compression driver with a built in DSP
Still need to add bolt holes and something to attach it to the box but it will print in two pieces. Each piece is currently a 20 hour print at 0.2 layer height.
I am gonna look at getting it finished and printed this week if I decide I am happy with the sims haha
This is the speaker I am looking at replacing
My main goals have been to get the same low end extension but in a smaller size and not necessarily as loud using drivers I mostly already own.
The box is currently 30.4cm x 26.7cm x 34.1cm but I might make it a bit bigger to get a bit lower
The drivers I am using are:
Faital Pro 6fe100
Faital Pro 3fe25
Faital Pro HF100
I used ATH for the initial horn flare
To power it I am going to use The Sure Electronics Jab5 amplifier which has 4 channels so 2 for the bass drivers, 1 for the mid drivers and 1 for the compression driver with a built in DSP
Still need to add bolt holes and something to attach it to the box but it will print in two pieces. Each piece is currently a 20 hour print at 0.2 layer height.
I am gonna look at getting it finished and printed this week if I decide I am happy with the sims haha
This is the speaker I am looking at replacing
I would use a higher excursion 6" and make the box sealed to reduce the overall size. Or perhaps remove the 6" from the horn and seperatly slot load a single larger driver.
I decided on this 6" because I already owned it and I am bad with buying drivers and half doing projects, I have so many random drivers from projects I haven't completed haha. I still need to continue the large MEH I was building, just still not managed to measure it with the rain haha.
I was concidering upping the driver to 8" to try and get a bit more out of it.
I reckon I will print this out to see how it turns out.
I will have a go at simming a sealed one with a few different 6" drivers, with this one sealed it wouldn't go very low. I wanted to keep the low driver in the horn as it will be going up to 500hz ish but will give it a go
I was concidering upping the driver to 8" to try and get a bit more out of it.
I reckon I will print this out to see how it turns out.
I will have a go at simming a sealed one with a few different 6" drivers, with this one sealed it wouldn't go very low. I wanted to keep the low driver in the horn as it will be going up to 500hz ish but will give it a go
The print has unfortunately failed with about 4 hours left 🙁
I nipped out to get some wood cut for the box so was out when it happened.
Doing some printer debugging at the moment but I think it was a collision with an overhanging bit that was a bit much so lifted up. I'm also gonna redesign the model to get rid of the unsupported overhang.
I nipped out to get some wood cut for the box so was out when it happened.
Doing some printer debugging at the moment but I think it was a collision with an overhanging bit that was a bit much so lifted up. I'm also gonna redesign the model to get rid of the unsupported overhang.
I have finally printed one side, set the other side off now.
Also mostly got all the wood cut, drilled and countersunk for the box. I could maybe get it all put together tomorrow
Also mostly got all the wood cut, drilled and countersunk for the box. I could maybe get it all put together tomorrow
Made some more progress
Might have had to do some slight cutting of the first print for the comp
All these holes for fitment were definitely cut before putting this box together haha
I have one more rear chamber for the Faital Pro 3FE25 to print out but then I should be able to get it all working
Might have had to do some slight cutting of the first print for the comp
All these holes for fitment were definitely cut before putting this box together haha
I have one more rear chamber for the Faital Pro 3FE25 to print out but then I should be able to get it all working
Managed to get it finished, wired up and tested.
I really like the sound of it, it sounds so nice. There isn't quite enough bass, I think I need to build a seperate sub haha.
The mid drivers rear chamber is a bit large compared to my sim which i think is what has caused that massive dip. I could see from measuring the impedance that it is tuned a bit lower.
The bass sim is very similar to the measurement, I think the rear chamber is a bit too small so it's tuned slightly higher.
I'm gonna get it painted and setup with a Wondom Jab5 amplifier next.
Measurements: (Calibrated correctly for 1w per meter)
After delay, gain and EQ:
Some more pictures:
Made a neoprene gasket to seal the horns together
I really like the sound of it, it sounds so nice. There isn't quite enough bass, I think I need to build a seperate sub haha.
The mid drivers rear chamber is a bit large compared to my sim which i think is what has caused that massive dip. I could see from measuring the impedance that it is tuned a bit lower.
The bass sim is very similar to the measurement, I think the rear chamber is a bit too small so it's tuned slightly higher.
I'm gonna get it painted and setup with a Wondom Jab5 amplifier next.
Measurements: (Calibrated correctly for 1w per meter)
After delay, gain and EQ:
Some more pictures:
Made a neoprene gasket to seal the horns together
I have ordered some more mid drivers, I'm gonna make a smaller rear chamber. The ones I used was off another horn I built a while back so will return them to that project.
Some measurement comparisons to the sims:
LF
Mid
Some measurement comparisons to the sims:
LF
Mid
I think the rear chamber of the mid driver is too large by quite a bit. I am going to make a smaller one and see if that helps.
it is quite a dip though haha
it is quite a dip though haha
Are you sure that all drivers that’s not being tested are shorted or connected to an amplifier so they won’t act as an damper?
Have you tried to tape over the different ports and only measure the mids (3fe25).
It’s quite a dip that I don’t have on my version with the same driver and simply a cardboard tube over the back of the driver.
Have you tried to tape over the different ports and only measure the mids (3fe25).
It’s quite a dip that I don’t have on my version with the same driver and simply a cardboard tube over the back of the driver.
Attachments
Hoping it might help to add.. Have you noticed the rear enclosure of compression drivers is dome shaped? It's not because the shape is good, it's because it's the smallest distance from the back of the cone. Then calculate where the modes start kicking in.
Last edited:
when I used the 3FE25 I went even smaller and paper mache over the back of the driver to make a sealed chamber the size of the basket. This was laborious though and I have had to replace drivers due to corroded tinsel leads presumably caused by the glue.
I will have another go at measuring it when I have time. There is some other things I need to measure as well so will hopefully be able to do it early next week.
I am 99% sure I did have the other drivers wired up.
I will try tape over the other ports as well. Because the waveguide is so small the LF ports are pretty big on there.
I have ran more sims to figure out the rear chamber volume on the mids and it is way too big haha. I'm gonna 3d print some bits to glue to the back of it and make the rear chamber the size of the basket.
I am 99% sure I did have the other drivers wired up.
I will try tape over the other ports as well. Because the waveguide is so small the LF ports are pretty big on there.
I have ran more sims to figure out the rear chamber volume on the mids and it is way too big haha. I'm gonna 3d print some bits to glue to the back of it and make the rear chamber the size of the basket.