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Old 27th October 2007, 09:55 PM   #1
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Default My XXLS Subwoofer building thread...

Hi All,

After much thought I've decided to use the following for my first subwoofer:

Peerless 830844 12" XXLS (4ohm)
Peerless 830548 Passive Radiator
Dayton HPSA1000 Plate Amplifier (500/8ohm, 1000/4ohm)

Cost: $950 AUD plus wood and finishing.

The box volume is 1.5 cubic feet (43L),

External dimensions: 16x16x16" (40.5x40.5x40.5cm)
Internal dimensions: 14x1414" (35x35x35cm)

I'm using this design from Solen as a template:

Sample Solen Design

According to the Solen Design it will go down to 18hz and produce 122db at 25hz, this was based on a 240/8ohm, 370/4ohm amplifier, I'm hoping to get better results with triple the power in 4ohms.

I'm going to finish the box in Piano Black.



What you guys think?
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Old 27th October 2007, 11:37 PM   #2
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23 views and no comments?

Come on guys!

Also whats the best way to measure the subwoofers output? With a mic and what software?
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Old 28th October 2007, 12:04 AM   #3
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Hi,

Have you put the figures into a modelling program, like Unibox?

There you will get an idea of excursion limited SPL, and power requirements needed to reach that limit, and you can compare between different box alignments.

Where will you be getting the Dayton amp from?

An alternative is the O-Audio 500W, with some nice features such as parametric EQ.

best regards,
Thanh.
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Old 28th October 2007, 12:35 AM   #4
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Click the image to open in full size.


I'm not sure I have done it correctly though, I have attached the unibox file:

UniBox file
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Old 28th October 2007, 06:18 PM   #5
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the xls 12 inch with passif was used with a 360watt and it bottomed out. so using 1000W will just not be good.
`f you want real bass at that sound pressure with 1000watts
go with aura 15 inch.neo magnet very low bass.fast to.
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Old 28th October 2007, 07:34 PM   #6
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I have recently built a sub with Peerless 830844 with PR in a 45liter box.
At the moment I use two LM3886 gainclone monoblocks bridged to power the sub (around 150 watts). The sub is now a little underpowered, but I think that anything more than 350-400W would be an overkill because even with a small amount of power I'm using it can still make a lot of cone movement and decent clean output.


My Peerless-based sub:
Click the image to open in full size.
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Old 28th October 2007, 07:37 PM   #7
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Hi,

Cool, thanks for the information.

What do you use the subwoofer for? Music or HT?

Done any measurements on it?
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Old 28th October 2007, 08:00 PM   #8
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I use it for both !
I haven't done any measurements yet, but the sub is very musical, integrates easy because of very low distortion (now it is placed right by my legs, but I can't 'hear' him, the bass I hear is coming only from the mains), and can reach the lowest octave with no problem.

I have first made a sub as a low Q closed box with only 830844 on front baffle and with Linkwitz transformer in the preamp. My room is relatively small and I had problems with integration. I couldn't hear any sub bass on the place I sit regardless on where I placed the sub, but the upper bass was perfectly clean and tight. Then I turned the sub downwards to the floor and realised that my sub has become a beast that shakes the tiles in my bathroom when I watch The Fifth Element, but has lost some of the musicality and tightness when I listen to music. So I ordered myself a Passive Radiator and mounted it on the bottom side of the box. Now I have the best of both worlds, and the sensitivity has also increased.

If you want to increase maximum output from one driver, I would suggest using 2 passive radiators instead of one because PR runs out of excursion much before the active driver does.
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Old 28th October 2007, 08:05 PM   #9
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Same box size with 2 PR's?
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Old 28th October 2007, 08:21 PM   #10
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For 2 PR's and the same frequency response as with one PR in 42liter box WinIsd says that you would have to use 250grams of added mass to PR cones.

A pair of 10" PR's would be also a good choice. 2 of them don't need any added mass to cones, they are cheaper that a pair of 12", and give about 3dB of headroom compared to one 12"PR.
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