Peerless XLS10 and passive radiator design

[greg_mcquaid]

Hi,

Looking at building a subwoofer with a peerless xls10 and either 1 or 2 10" peerless Passive radiators.

Now i have been playing around with unixbox and i have come up with the following design based on the xls10 and 1 passive radiator.

The first design i came up with was a 32l enclosure with the xls10 and 1 passive radiator. Now this should give response down to 27hz before the the passive radiator hits max excursion. I have attached a graph of this design.

Now i assumed that if i could use 2 passive radiators then i should be able to come up with a design that gets me down to around 20hz, but playing with unibox i cant seem to come up with a design that will get me to that goal.

Can anyone suggest a way of getting down to 20hz using the 2 passive's and the XLS10?

Thanks,
Greg

 

[audiobomber]

Maybe this will help. http://www.bamberglab.com/xls.shtml

 

[MJL21193]

Hi,
I ran the sub you want with two passive radiators on unibox and came up with a design that will give good response down to 20Hz, but the box would be be large (70 litres). What weight PR did you input? 400 grams is what I tried. Adding weight to the PR will lower FB, but you give up some efficiency.

 

[greg_mcquaid]

I am using 265g passive radiators. I didn't really want to go over say 50l for box size. Maybe i am being to optimistic about the response down to 20hz, maybe i should aim a little higher (although 20hz would be nice!).

 

[rabbitz]

Have you thought of using the 12" PR instead?

I've found that the excursion shown in the software doesn't directly relate to the real world in most cases. I have FR drivers that should hit the stops at less than 1W but are still powering at 30W.... program material is different. There was a thread in the FR section recently about this.

 

[MJL21193]

Smaller box means adding mass to passives. This will also reduce excursion. Your 265 gram PR is more suited to a smaller driver, its too light for what you want. Its easy- add weight to the passives in unibox untill you get the response where you want it with the box size you want.

 

[GlennME]

Here's a project using the 10" XLS and passive radiator.

http://www.hardwareanalysis.com/action/printarticle/1789/

And another using a 12" XLS and 2 passive radiators.

http://www.geocities.com/adrian_mack/

 

[MJL21193]

In Sander's project on http://www.hardwareanalysis.com/act...ntarticle/1789/
he actually adds 200 grams to the 400 gram passive radiator to get the response down to below 20Hz. Well worth reading.

 

[pegodk]

I have a problem with something of the same build. Got 1 Peerless XLS 10 sub and one xls 10 passive radiator (265 g mms) built into a 30 L box with an amp giving about 160 watts.

My problem is simulation of the excursion of the slave.
I have seen many building guides saying you need to add weight to avoid hitting xmax on the slave.

(for example: Build your own 10" subwoofer, a detailed how-to - Conclusion
and http://www.d-s-t.com.au/data/Peerless/Peerless_XLS_Subwoofer.pdf

In this design, it doesn't seem like he adds any weight tho..
Peerless XLS10 10" Subwoofer (830452) and Passive Radiator (830481))

When I plot it in bassbox with 160 watts, I get about 18 mm of excursion at around 24-25 hertz.

Am I right that I don't need to add weight to the slave or have I miscalculated somewhere? I hope someone can help me

Regards
Peter