What about using a 18" until 500Hz? - diyAudio
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Old 5th August 2006, 07:25 PM   #1
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Default What about using a 18" until 500Hz?

Hello,

In my quest of best bass from around 40Hz to 200Hz, I've found an interesting 18" that rich 47Hz in a closed box of 120l with Qtc=0,707.
My question is to know if a 18" can rich 200Hz with good sound for hifi...

One of my friend is interested too in this driver but have horns from 500Hz to 20000Hz. Do you think it's possible for him to use this driver to 500Hz????

Thanks

T&S of this 18"

96dB
Fs : 25,5
Qts : 0,38
Vas : 288l
Xmax : 8mm
Mms : 279g
BL : 24,5Tm
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Old 6th August 2006, 03:33 AM   #2
owdi is offline owdi  United States
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T&S parameters are useful for estimating bass response, and tell you very little about how the driver will perform a few octaves above fs.

Dan
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Old 6th August 2006, 12:58 PM   #3
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So the only thing to do is to buy one and mesure it???
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Old 6th August 2006, 02:09 PM   #4
Bogie is offline Bogie  United States
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Well, it'll probably help us if you tell us who made the darn thing...

I know one band with fairly decent sound who are using four 15s as "mids" up to about 1800-2000hz... Their low end is four Peavey 18" lowriders...
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Old 6th August 2006, 02:15 PM   #5
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Fs of 25 is low, but not super low

Im no expert, but I believe that low inductance (Le) is an indictor of the ability to play higher without distortion.

I would guess that an 18, youd be lucky to get much above say 300 Hz cleanly, unless Le < say 0.5.

Cheers
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Old 6th August 2006, 02:52 PM   #6
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That's the driver :


http://www.bmspro.info/photos/bmspro_info/18S430.pdf
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Old 6th August 2006, 03:45 PM   #7
Bogie is offline Bogie  United States
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I think the spec that definitely tops out the freq response at 200 hz might be a hint that you won't be happy higher... The cute little chart they've got looks nice, but I'll bet that it is fiction... Look at how inductance starts to play after about 200 or so...

Won't reach 500, and I'd probably cross it at 160ish max... Let it do the heavy lifting, and a nice mid could deal with the detail...
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Old 6th August 2006, 05:08 PM   #8
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200 Hz should be no problem, but keep in mind if you are using them in stereo configuration or just a single sub. I'd think above 80 Hz or so you would want stereo. Unfortunately they don't show frequency response.

I'd expect that 500 Hz should also be possible in theory, although you should hesitate without a frequency response at least to see what is happening. The reason they specified 200 Hz is not clear but I would not take is as the last and final word on the matter for all purposes.
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Old 6th August 2006, 06:21 PM   #9
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2 issues are breakup and beaming.

Breakup is when the speaker cone deforms and is no longer a rigid piston.
This causes distortion.
Beaming is when the sound goes in one direction more than other directions. Then you have to sit in just the right spot to hear all the sound. (sweet spot).
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Old 6th August 2006, 06:29 PM   #10
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Also check Eighteensound's drivers.
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