Hey there,
its been a while since I build any speaker. About 10 years ago I built a coupe of fullrage speakers and some subwoofers, most of them are still in use and I like them all.
Now I have a new project because friends dared me to do this and to be honest, I have no idea how to start. I want to built a tapped horn for a portable boom box. The amp would be a dual TPA3116 2.1 powerd by a lipo pack. From what I hear, the bridged chip amp shoud get best effiency with a low impedance subwoofer, I got this still around from a never-made car project:
https://www.gladen.de/GladenWooferPDFs/RS08Extreme.pdf
To be honest, I have no Idea if this chassis is even suitable for a horn. But I have it, so I'd like to try it, before I buy another speaker.
Next step was to try out hornresp, but that is where I failed. I started putting in the data, but didnt find a value for Le. And that was that. And even after simulating it with hornresp, I will need to fold it somehow... I tried some of these Excel calculators,
The Subwoofer DIY Page - Horn Folding
but when I put in some mesurements, there are panel floating beside the box, so this doesnt really work for me either. (or I'm just to stupid)
Maybe you guys can help me a little on the way...?
its been a while since I build any speaker. About 10 years ago I built a coupe of fullrage speakers and some subwoofers, most of them are still in use and I like them all.
Now I have a new project because friends dared me to do this and to be honest, I have no idea how to start. I want to built a tapped horn for a portable boom box. The amp would be a dual TPA3116 2.1 powerd by a lipo pack. From what I hear, the bridged chip amp shoud get best effiency with a low impedance subwoofer, I got this still around from a never-made car project:
https://www.gladen.de/GladenWooferPDFs/RS08Extreme.pdf
To be honest, I have no Idea if this chassis is even suitable for a horn. But I have it, so I'd like to try it, before I buy another speaker.
Next step was to try out hornresp, but that is where I failed. I started putting in the data, but didnt find a value for Le. And that was that. And even after simulating it with hornresp, I will need to fold it somehow... I tried some of these Excel calculators,
The Subwoofer DIY Page - Horn Folding
but when I put in some mesurements, there are panel floating beside the box, so this doesnt really work for me either. (or I'm just to stupid)
Maybe you guys can help me a little on the way...?
In Hornresp double click the "Sd" input field to open a popup for driver parameters. Then you can save the driver by selecting "File" > "Copy driver to database" for future use. You can "Paste driver from database" to new projects.
I have used hornresp for maybe 10 hours and its still a bit confusing 😀 But here is a quick start for you:
1. Click Add from bottom to start a new project
2. From Help menu, click through Input wizard to get started with tapped horn
3. Input driver parameters doubleclicking the Sd field or paste driver from database
4. start loudspeaker wizard from Tools menu and start fiddling with the values 😀
I don't know anything about designing tapped horns. Maybe you could start with WinISD default design for the driver and write the enclosure volume down. Then in hornresp, initially set values so that enclosure volume is in the ballpark. Then try to get good curve (in the power window) by trial and error 🙂
I have used hornresp for maybe 10 hours and its still a bit confusing 😀 But here is a quick start for you:
1. Click Add from bottom to start a new project
2. From Help menu, click through Input wizard to get started with tapped horn
3. Input driver parameters doubleclicking the Sd field or paste driver from database
4. start loudspeaker wizard from Tools menu and start fiddling with the values 😀
I don't know anything about designing tapped horns. Maybe you could start with WinISD default design for the driver and write the enclosure volume down. Then in hornresp, initially set values so that enclosure volume is in the ballpark. Then try to get good curve (in the power window) by trial and error 🙂
Attachments
Googled some reading with hornresp references for you🙂
The Smallest Tapped Horn
Cheap and small Tapped Horn - AVS Forum | Home Theater Discussions And Reviews
The Smallest Tapped Horn
Cheap and small Tapped Horn - AVS Forum | Home Theater Discussions And Reviews
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thanks for your replies tmuikku. Well I have read some hornresp tutorials before, but as I said I always failed either about missis parameters or missing knowlege on my part. The links yo posted are quite intressting but in the end didn't melp me. One of these woofers is not available anymore and none of them is 2 ohm. In fact all the stuff I found so far uses PA grade woofers, with 4 or 8 ohmm which are not really suitable for a battery powered solution that aims at maximum efficiency rather than lowest frequency.
Oops! Ran the numbers, but didn't notice the app! 🙁 Still, not horrendous for a boombox as the basic 36 Hz TH = ~40 L net and the preferred 25 Hz is ~54.9 L net, so ~25% larger once built?
A 36 Hz 2:1 CR TP = ~31.4 L net, though so small in cross section that the motor will stick out through the terminus. 🙁
GM
A 36 Hz 2:1 CR TP = ~31.4 L net, though so small in cross section that the motor will stick out through the terminus. 🙁
GM
I forgot to mention, it will be mounted on a handcart, so I could live with about 50 liters.
Please, would you mind sharing your calculations? Maybe there is a sweetspot at about 30hz, where the case ist just big enough to accommodate the driver?
Please, would you mind sharing your calculations? Maybe there is a sweetspot at about 30hz, where the case ist just big enough to accommodate the driver?
Tapped horn and portabiliy, well.. tapped horns just tend to be large if good efficiency and low extension is needed.
Have you checked out this anyway?
Martinsson's Blog - A smaller sub proposal
I think passive radiator systems are the best if small size vs big spl is the thing. As you may have noticed, most portable boom boxes are using this topology.
Have you checked out this anyway?
Martinsson's Blog - A smaller sub proposal
I think passive radiator systems are the best if small size vs big spl is the thing. As you may have noticed, most portable boom boxes are using this topology.
As a general rule, true TH is best when tuned to <Fs. Note that with no inductance [Le] or excursion [Xmax] specsI just arbitrarily used 1 mH, 8 mm since it has a large surround, so performance may not be as good as predicted.
Anyway, load it into HR to view.
GM
Anyway, load it into HR to view.
GM
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