Want to build small subwoofer

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c3ham

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Joined 2006
#1
hi

I would like to try and build a small sub to replace the one i got with this kit http://www.denon.co.uk/site/frames_...ppe_C=4&action=detail&Pid=258&main=prod&sub=1 but dont really have a clue where to start. I was wonder if you guys could point me in the right direction where to buy the parts and whether to build a sealed or ported box i have a budget of about £150 for the amp and driver.

Any help would be great guys
cheers
 
#5
Some of the paramaters like xmax were not given so I guessed. It looks like it was intended for a pretty small box but you have to tune below "optimally flat" to get much low output. Given the probable room gain I like this one which is a pretty small box good for anything down to 16' pedal stops at reasonable volume levels. 🙂

mike
 

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#7
a wee question how come this small sub using the xls10 doesnt have a passive radiator is it because the sub isnt very good or some other reason sorry for the stupid question but im a total newbie just trying to learn 🙂


cheers for all the help guys
 
#9
The passive radiator is required to get the best out of the drive unit. However, in a sealed box and with some electronic EQ it can still perform well. This way usually results in a bit smaller box.

BK must have chosen this design to suit their target price and market. It would complement your little speakers well, I dare say even show them up for how cheap they are, and be a considerable improvement on the effort you got with the set.
 
#13
Need more info!

I suggest WinISD pro, and that you consider all the filters you will have with your amp - rumble filter, crossover, etc, or it is not a complete design. I wrote some wiki articles on this (see below) which you might find helpful.

With compromises, such as making box bigger than you may have otherwise done, you should be able to pull off a vented XLS without a PR, or you could make it sealed. It won't be in the same league as the sub you are replacing, it will be infinitely better. This driver is used in some very high end systems.
 
#17
If you want to design the box it is not very difficult, even for a newbie. I have written a few wiki articles to help with this (follow links in my signature).

What you have shown so far isn't what I would call a design that is ready to build.

This is what I call a decent subwoofer design.

1. box volume, port length and diameter
2. amp and driver chosen
3. specs of all the filters available - eg. variable 2nd order lowpass, 3rd order highpass (rumble filter) @ 20 Hz, boost if present and any other eq that you might have
4. filters included in the charts you use to assess the design (use WinISD pro)
5. response meets target F3
6. response integrates correctly with main speakers
7. power to reach xmax considered and power available from amp, and thermal limits of driver considered
8. group delay is not too high (not so easy to determine)
9. vent velocity is not too high - should be considered along with aerodynamics of port

This isn't exhaustive, but I'd say at least address those issues before you build. It's not that hard, and help is available on each point. The trick is making good choices and balance compromises.
 
#18

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