Want to build small subwoofer

[paulspencer]

If the amp blows up, then it's probably a mistake, otherwise it's probably a better choice. Chances are, it will be ok. That sub will have an easy task keeping up with the speakers you have, and with that in mind, you should not have problems. I just mention the impedance issue as one to be aware of that MIGHT cause you problems. It's a problem the XLS has and I'm not aware of other 4 ohm drivers with this problem, although I'm sure they exist as well.

 

[c3ham]

Hi

I emailed the manufacturer of the amp and they said its good down to 3 ohms and the zmin of the driver is 3.9 ohms so everything should be ok right?

 

[richie00boy]

Yes. Fire it up!

 

[paulspencer]

I had a look and the XXLS drivers are better behaved in their impedance. You should not have a problem. I had wondered if there was any real improvement over the XLS series, but I would say apart from the flexibility of a higher Qts version, there is the nice advantage of having a 4 ohm driver which has an impedance that drops not much below that of the XLS 8 ohm driver.

 

[c3ham]

testing my sub out before i paint it

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[c3ham]

what u guys think?

 

[paulspencer]

Is that the 10" or 12"? It looks like 10" based on the size of the dustcap! I do like the look of the 10" XLS but the 12" versions I have seen have been ugly

How did you get that response curve?

 

[c3ham]

hi paul

Its the 10" version and i got the curve by setting the sub up like so +6db @30hz and crossover @120hz and i used roomeq and a radio shack spl meter to get the readings

cheers

 

[paulspencer]

That response looks pretty good. You could use a bit of eq, probably two bands of parametric eq to tame it a bit.

 

[richie00boy]

Looks a neat job. Have you used a flush trimming router bit?

 

[c3ham]

hi

no i didnt use a flush trim bit just sanded it with an orbital sander the joints where nearly perfect anyway Is it a feedback destroyer i would need to use to tame the curve paul?

 

[paulspencer]

You could use that, yes. It's a cheap simple option. Another is Ultracurve (more expensive but also will eq mains).

 

[c3ham]

would there be any point in stuffing my box with accoustic wadding?

thanks guys

 

[richie00boy]

Depending on what you use and how tight you pack it, you might notice a small difference.

 

[c3ham]

thanks for the reply richie i bought this gear http://cpc.farnell.com/jsp/endecaSearch/partDetail.jsp?sku=LS00385 do i just add it to each of the inside faces or do i stuff the whole box with it ? and what exactly does it improve

 

[paulspencer]

Stuffing lowers box Q by increasing the apparent box volume. Stuffing should fill the entire box, otherwise what you have is lining which will have a different effect - merely to absorb lower midrange frequencies, say above 100 Hz.

 

[richie00boy]

That stuff is BAF wadding, I use it myself. If you fill the box but don't allow it to compress much it should increase apparant box volume by a small percentage, and if you had any midrange honks they will probably go away unless they are cone modes.