Hi guys, I've been meaning to build a sub woofer for ages but never got around to it. I think I may have posted one or two threads on here before but chickened out at the last minute :grin:
At our work we have an abundance of these tubes:
They are pretty sturdy (they usually have about 40KGs worth of thin film solar panel wrapped around them) and are approximately 300mm x 1200mm.
I modelled a sub woofer design based around this tube and I came up with this:
Which would be all well and good, but I haven't a clue if this is good or bad!
A few notes:
The driver is an XLS10
The port is 100mm x 493mm
It's tuned to 23hz (don't ask why, it just sounded like a nice figure :god🙂
I'd quite like to keep to a cylinder shape if I can, I like the look of them and they take up a relatively small amount of floor space.
Any input?
At our work we have an abundance of these tubes:
They are pretty sturdy (they usually have about 40KGs worth of thin film solar panel wrapped around them) and are approximately 300mm x 1200mm.
I modelled a sub woofer design based around this tube and I came up with this:
Which would be all well and good, but I haven't a clue if this is good or bad!
A few notes:
The driver is an XLS10
The port is 100mm x 493mm
It's tuned to 23hz (don't ask why, it just sounded like a nice figure :god🙂
I'd quite like to keep to a cylinder shape if I can, I like the look of them and they take up a relatively small amount of floor space.
Any input?
Looks pretty good, wide and relatively flat response.
What are the group delay, excursion, phase and vent velocity plots like? What is it's intended use-audio or HT?
EDIT: Oh, and have you got any spare tubes? 🙂
What are the group delay, excursion, phase and vent velocity plots like? What is it's intended use-audio or HT?
EDIT: Oh, and have you got any spare tubes? 🙂
An externally hosted image should be here but it was not working when we last tested it.
I couldn't find the graph for excursion, I'm still ambling my way around this software :|
This is the point where you tell me to scrap it and start over again right?
I will be using it for a mix of music and HT, and will probably get this amp. eBay - The UK's Online Marketplace
It would probably cost more than it's worth to ship one of these tubes 😛
Go for it! I had a pair of XLS 10"s in 80 litre boxes, with a 22-24Hz tune, and they were great.
I used a 4" port, you will need a HPF, mine used to bottom out with 220 watts input when watching movies.
I used a 4" port, you will need a HPF, mine used to bottom out with 220 watts input when watching movies.
There are some problems. I'm assuming that you want to build this with the driver down firing. The XLS 10" does not like to be mounted that way as the cone will have excessive sag. I would not go over 50L or the upper "punch" region of the output will sound dull. The port length is also too long to fit in the tube. I would recommend using a Passive Radiator.
If you don't have the program 'Sonosub' it will help a lot. Sonosub - Free Speaker Design Software
If you don't have the program 'Sonosub' it will help a lot. Sonosub - Free Speaker Design Software
Phase shift and Group delay are a little on the high side for my liking, Revboden makes good points regarding the mounting.
Excursion is the "CD" tab (cone displacement)
The amp should be fine power wise, but you will need a separate HPF to filter the unwanted subsonics below the tuning freq of the box. You can buy these separately, but better to buy an amp with one built in.
FMOD (Filter Module) High Pass RCA Level Crossover
Excursion is the "CD" tab (cone displacement)
The amp should be fine power wise, but you will need a separate HPF to filter the unwanted subsonics below the tuning freq of the box. You can buy these separately, but better to buy an amp with one built in.
FMOD (Filter Module) High Pass RCA Level Crossover
For HT it looks fine to me, for music I would try to lower the group delay and vent air speed. But the vent air speed also depends on how loud you normally listen.
If you apply the lowpass-filter (at say 80 Hz, 4order) you will see that the tuning frequency is a bit high. Not that it is not low, but you could extend the lowfrequency range. Just look at the picture after aplying a 80Hz 4th order lowpass.
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