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Old 14th March 2013, 01:50 AM   #1
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Default Peerless xls10 in sealed enclosure

Hi.

I'm new on this forum and this will be my first project.

I just bought a peerless 10' driver and it will be powered by 300W into 4Ohm plate amp - custom build.

Subwoofer will be based on Vikash Chauhan project

Construction of the Peerless XLS10 Subwoofer Enclosure.

The only problem is I cannot match passive radiator as its no longer available. I found something similar:

26W/0-00-00 - Scan Speak Discovery 10” passive - Europe Audio

Will be this radiator OK to calibrate after all ? I was also thinking about two eight inches dayton radiators insted. Any other sugestions??
Regarding building materials in this project I think it will be better to use thicker 1inch MDF.
How about damping materials? With 25-30 litres enclosure and all features it won't be much room for thicker insulation..

You can share your opinion and i'm open to any advices regarding this project :-)

THX in advance
Marcin

Last edited by 131183914; 14th March 2013 at 02:52 AM.
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Old 14th March 2013, 08:12 PM   #2
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I have moved this over here for a better response.
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Old 14th March 2013, 09:40 PM   #3
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I never made a project for a PR. This one you linked it's a 10" with 400g and has 28 mm excursion so I only can see it as being a good fit.
Let's check that we are in the same project concept, same driver.
Driver: Peerless XLS 10" Subwoofer (830452)
Peerless XLS10 10" Subwoofer (830452) and Passive Radiator (830481)
Passive used in the previous project:
http://www.tymphany.com/files/resour...ess/830481.pdf
http://www.d-s-t.com.au/data/Peerles..._Subwoofer.pdf

As an interesting topic for the Peerless XLS 830452 in a 25 L box tunned to 32 Hz gives a in room F3~30Hz (F3=35Hz freefield) and to me is not a very interesting proposition (read driver) because it's already max out from ideal volume (15/17 L) and consequent roll off. But hey maybe it works...
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Old 14th March 2013, 11:02 PM   #4
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Quote:
Originally Posted by Inductor View Post
I never made a project for a PR. This one you linked it's a 10" with 400g and has 28 mm excursion so I only can see it as being a good fit.
Let's check that we are in the same project concept, same driver.
Driver: Peerless XLS 10" Subwoofer (830452)
Peerless XLS10 10" Subwoofer (830452) and Passive Radiator (830481)
Passive used in the previous project:
http://www.tymphany.com/files/resour...ess/830481.pdf
http://www.d-s-t.com.au/data/Peerles..._Subwoofer.pdf

As an interesting topic for the Peerless XLS 830452 in a 25 L box tunned to 32 Hz gives a in room F3~30Hz (F3=35Hz freefield) and to me is not a very interesting proposition (read driver) because it's already max out from ideal volume (15/17 L) and consequent roll off. But hey maybe it works...
Como vai voce Inductor.
Obrigado for extensive explanation. What would recommend in this case? Different volume? Vented box?

As I wrote earlier, already have bought the xls10 driver so have to stick to that
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Old 15th March 2013, 05:28 AM   #5
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Quote:
already have bought the xls10 driver
In your case/application I probably would make horns. Best application/use for this driver is BR, as stated and horns.
Another application (sealed), do not confuse with this they are different drivers, just for show Peerless XXLS 10”
I think the passive radiator is a great build and response similar to the bass reflex without a port.
Read from page 6-7... (smaller box/more control)
Quote:
The response is similar to the vented system with approx -6 dB at 40 Hz which may be corrected
by a simple first order circuit in the filter.
The maximum SPL produced by the system with 400W can be seen below:
At 25 Hz the maximum is 106 dB, but we need to inspect the cone and slave excursion before
proceeding with the design:
From this simulation we see that the maximum excursion of the driver is well within the limits
down to 20 Hz where the linearity limit of 12.5 mm is reached.
For the slave the mechanical limit of the excursion is 22 mm which occurs at approx. 26 Hz. This
means that the system with a 400g moving mass on the slave is not able to produce 105 dB at 25
Hz because the slave will be overloading.
If we choose a lower tuning frequency the active driver will take more of the load utilising the full
potential of the active driver and reducing the needed excursion of the passive driver.
...
Conclusion for Passive radiator system:
Special considerations regarding overloading of the passive radiator is needed for passive
radiator systems. Careful selection of limiting circuits and tuning frequency is needed to avoid
unwanted noises from the system.
It has been shown that the tuning of the box is possible but that the user need to invest some
time in adjusting the filters and limiters to achieve the goal.
Passive radiator system data:
Total volume: 20 litre
XLS slave with 600g Mms
Tuning frequency: 21 Hz
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Old 15th March 2013, 05:39 AM   #6
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Quote:
Como vai você Inductor.
Bem obrigado. You are welcome Marcin.
Not easy for a first project but very exciting with the extra difficulty of the passive radiator. Horns are more difficult to build and (it's) good to have a project to follow or doing all the calculations (yourself or) for the first time.
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Old 16th March 2013, 12:31 AM   #7
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Hi Inductor.
I think horn would be the best bet as my amplifier doesn't have an equaliser, therefore not sure if I be able to tune the frequency. Take a look @ below link
SUB300 - IREK
Unfortunately all specs are in polish but u can click on pics, hope it gives u a clue what I'm dealing with.
I know that horn are more complex to built but I'm good at carpentry and may take that risk :-) They only thing that bothers me is enormus size of horn application. I would like to keep small small volume due to limited space.
Somebody already made some calculation for xls10 at horn enclosure and comes up with this idea:

PEERLESS XLS10

These cabinets 170.2cm and other 120cm high, are way too big.. enormous :-)
I'd like to keep it more squarish, even if construction would be more difficult and complicated to build.
I have to ask someone to make a simulation and calculate whole cabinet
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Old 16th March 2013, 07:01 PM   #8
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Marcin,
There's TL's (Transmission Line Speakers, Quarter Wavelengths, et al.) and there's horns they are different.
My simulation shows as good design projects for this driver (with a better use of his specs) the (1) horn (not a tapped horn) and (2) BR.
In case you want give a look at a broad simulation for a TL (or TQWT) look here
In detriment of other designs, I really liked the design/project made by seppi0815 in post #36 of your link (only that the plastic rollers should be rubber).

Last edited by Inductor; 16th March 2013 at 07:05 PM.
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Old 16th March 2013, 10:24 PM   #9
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Quote:
My simulation shows as good design projects for this driver (with a better use of his specs) the (1) horn (not a tapped horn) and (2) BR
I really would like to see these
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Old 17th March 2013, 01:34 AM   #10
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There's nothing to see really besides what was posted. The alignments and all for the passive radiator. For a horn is just calculating it's size, flares and all, throat/mouth and length. What do you want to see?
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