HELP ! how to make an air chamber of 25L - diyAudio
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Old 21st December 2008, 04:49 AM   #1
tcat is offline tcat  Australia
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Default HELP ! how to make an air chamber of 25L

I have brought some components to put together some floor standing loudspeakers. I have a 200w rms crossover wich i idealy need to change to a 500w rms powered crossover. so i also have a 50w rms alumium dome tweeter, 70w rms mid and a 150w rms 300w max woofer.
everything is and can be wired easily but i am unsure of how big a 25 Littre chamber is or could be, it would be greatly appreciated if someone could help me out here or give me some suggestions, thanks heaps.
here are the tech specs if you need them to
Specifications:
Nominal impedance: 8 ohms
Power handling: 150WRMS
Sensitivity: 86dB (1W at 1m)
Qms: 2.15
Qes: 0.57
Qts: 0.45
Vas: 30.6 litres
Fs: 35Hz
Tuning frequency: 35Hz
Recommended enclosure volume 25 litres, ported.
Dimensions: mm
- A= 243
- B= 219
- C= 202
- D= 96.5
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Old 21st December 2008, 02:50 PM   #2
AndrewT is offline AndrewT  Scotland
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with a Qts of 0.45, I consider this driver unsuitable for a vented enclosure.
I suggest you try a sealed box enclosure and use a Linkwitz transform to adjust the bass parameters to suit your room and hearing preferences. But do not try to use +20dB of boost. Aim for <=+10dB
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regards Andrew T.
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Old 21st December 2008, 10:41 PM   #3
tcat is offline tcat  Australia
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Quote:
Originally posted by AndrewT
with a Qts of 0.45, I consider this driver unsuitable for a vented enclosure.
I suggest you try a sealed box enclosure and use a Linkwitz transform to adjust the bass parameters to suit your room and hearing preferences. But do not try to use +20dB of boost. Aim for <=+10dB

thanx heaps, my knowledge of this stuf compared to you is a little impaired so wats a linkwitz and how do i use it ?
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Old 3rd January 2009, 05:45 AM   #4
00600 is offline 00600  United States
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Quote:
Originally posted by tcat



thanx heaps, my knowledge of this stuf compared to you is a little impaired so wats a linkwitz and how do i use it ?

http://sound.westhost.com/linkwitz-transform.htm

that should get you started....
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