Ok, I found the XXLS line. It says the DVC version of the 12" has an F3 of 43hz in a 1.75 cf box. I am using the BASH 300 w amp from PE. ( http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=300-750) What can I do to EQ a lower F3 out of that driver in that box? I've never gotten much into that.
If you need a small sealed box but not home theater LFE output levels you can just use a Linkwitz Transform plus the driver of your choice (because of distortion, displacement, or already owning one).
Example using the Peerless XLS12:
Linkwitz Thor
1.7 cubic feet, Fp 20Hz, Qp .5., 1.7 cubic feet, F3 30Hz, 108dB into quarter space at 20Hz (Excursion limited).
Example using the Peerless XLS12:
Linkwitz Thor
1.7 cubic feet, Fp 20Hz, Qp .5., 1.7 cubic feet, F3 30Hz, 108dB into quarter space at 20Hz (Excursion limited).
It is possible to design a vented box for the XLS, although it is a lot more difficult than a lot of other drivers, as the vent will tend to be long. Rabbitz on this forum has put a 10" XLS in a small vented box with a B&W port 65mm diam IIRC and it works fine. You at least need a large flare radius. An external vent is possible, but IMO negates the advantage of having a small box. One compromise would be a pair of small vented 10" XLS subs. You could make them slim profile to get reasonable volume and use a smallish vent (65-75mm) with large flare radius (ie >36mm), and perhaps even experiment with golf style dimples. You could power them with an economical cheapish PA amp (say 250-350w with no fan), and make up a subwoofer processor with rumble filter included.
Another way to go is just use a 12" with higher excursion and a linkwitz transform. Then you can easily get small. For this you want a driver with some more excursion. The AE speakers AV12 is a good candidate with twice the displacement of the XLS, hence in a sealed box it will have about the same output as an XLS with a vent or a passive radiator. And it will be cheaper.
Another way to go is just use a 12" with higher excursion and a linkwitz transform. Then you can easily get small. For this you want a driver with some more excursion. The AE speakers AV12 is a good candidate with twice the displacement of the XLS, hence in a sealed box it will have about the same output as an XLS with a vent or a passive radiator. And it will be cheaper.
Yep, it does sound silly! (sorry)
There is nothing cheap looking about the AV12. It has a nice brushed aluminium cone, I consider it a lot more classy than other drivers with the typical paper based materials. The basket also looks pretty serious, being cast aluminium. All very robust and solid, with a look of quality. If some cheap crummy company manages to mimic the look (probably with paint rather than actual aluminium), then more power to em!
Still, this is all very subjective. If you don't like the way they look, don't buy them, there are cheaper materials if you don't like aluminium.
There is nothing cheap looking about the AV12. It has a nice brushed aluminium cone, I consider it a lot more classy than other drivers with the typical paper based materials. The basket also looks pretty serious, being cast aluminium. All very robust and solid, with a look of quality. If some cheap crummy company manages to mimic the look (probably with paint rather than actual aluminium), then more power to em!
Still, this is all very subjective. If you don't like the way they look, don't buy them, there are cheaper materials if you don't like aluminium.
hey everyone, i'm gonna join in on the thread as i have a pair of 12' XLS drivers without boxes, and dunno what to do with'em to tell you the truth..
I'v been playing with winisd a lot and reading up on other people's projects and peerless's material on the drivers, but i just cant make up my mind, cant decide wich is the better choise..
using passive radiators wont be a option for me, since they cost more than what i paid for the drivers.
throw out as much good info and oppinions as possible!
thanks
Marius
I'v been playing with winisd a lot and reading up on other people's projects and peerless's material on the drivers, but i just cant make up my mind, cant decide wich is the better choise..
using passive radiators wont be a option for me, since they cost more than what i paid for the drivers.
throw out as much good info and oppinions as possible!
thanks
Marius
Marius,
Do a google search for "critical Q subwoofer" and also for "Linkwitz Thor subwoofer" and you will find good information on doing a sealed sub.
For a vented version, put these numbers into WinISD pro:
90L vented box
tuned at 22 Hz
120mm diam vent x 675mm long with 50mm flare radius on each end
140w input signal
filters:
lowpass - 4th order Linkwitz Riley @ 80 Hz
highpass - 3rd order @ 20 Hz
static gain - 4db
Now look at the response, -3db points are at 21 and 85 Hz.
Now SPL - 109db @ 25 Hz
Now look at cone excursion - xmax will not be exceeded with any signal, and excursion does not increase below tuning ie. it is less below tuning than it is at 30 Hz.
Now look at the rear port air velocity - it does not exceed 23m/s which is acceptable for a vent which has a 50mm flare radius, according to experiments from another member of the forum.
A sealed box with eq will be much smaller, however, you will only get 97db @ 22 Hz or 99db @ 25 Hz. This means you need at least two of them to get some decent output and extension for HT.
The vented version has lower distortion but is bigger. Done right it should not be inferior to the sealed version in any way except size.
Do a google search for "critical Q subwoofer" and also for "Linkwitz Thor subwoofer" and you will find good information on doing a sealed sub.
For a vented version, put these numbers into WinISD pro:
90L vented box
tuned at 22 Hz
120mm diam vent x 675mm long with 50mm flare radius on each end
140w input signal
filters:
lowpass - 4th order Linkwitz Riley @ 80 Hz
highpass - 3rd order @ 20 Hz
static gain - 4db
Now look at the response, -3db points are at 21 and 85 Hz.
Now SPL - 109db @ 25 Hz
Now look at cone excursion - xmax will not be exceeded with any signal, and excursion does not increase below tuning ie. it is less below tuning than it is at 30 Hz.
Now look at the rear port air velocity - it does not exceed 23m/s which is acceptable for a vent which has a 50mm flare radius, according to experiments from another member of the forum.
A sealed box with eq will be much smaller, however, you will only get 97db @ 22 Hz or 99db @ 25 Hz. This means you need at least two of them to get some decent output and extension for HT.
The vented version has lower distortion but is bigger. Done right it should not be inferior to the sealed version in any way except size.
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