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Old 26th August 2007, 09:15 PM   #11
Speakerholic
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Hi,

PA drivers are not for really low frequencies. Many 15"ers have Fs' around 35 Hz and an Xmax of around 6 mm. They are intended for music only and are very efficient. Everything's a trade off. Personally, I don't need anything below 30Hz to keep me happy. Even for movies.
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Old 26th August 2007, 09:18 PM   #12
Daveis is offline Daveis  United States
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Looking at this

http://www.htguide.com/forum/showthread.php4?t=18218

I see lots of people used Adire Audio drivers. But as far as I know Adire Audio is out of business now.
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Old 26th August 2007, 09:19 PM   #13
Mikey p is offline Mikey p  Canada
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Here's a 18 with good specs and a excellent price.
http://www.mach5audio.com/product_in...2e5a12aa8034b9
Prices quoted include shipping. It needs a box around 12 cubic feet.
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Old 26th August 2007, 09:21 PM   #14
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Try some searching on EBS designs. The output drops slowly down to the tuning frequency, then plummets below that. The idea is to tie in with any room gain available and give in room response flat down to the low teens.

If you put a 'flat to 20Hz' sub in a typical room it would sound 'boomy' due to room gain boosting the sub 30 / 40Hz freqs.

Have a search and read on room gain too.


I'm not clued up on specific drivers right now, but can tell you to stay away from pro gear and look more at home gear or even car subs.

the avalanche 18 driver used to be popular but I don't know if it's still available.

Cheers,
Rob.
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Old 26th August 2007, 09:26 PM   #15
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Oh Cal,

Re: your sig.

I always thought 'sub' meant 'below', and a 'sub woofer' was a speaker used 'below the woofer'. If you called a subwoofer an infra woofer then it would imply that it produced frequencies we couldn't hear. Most 'subs' cross at 50 - 120Hz, and thats easily in the audible range.

Rob.
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Old 26th August 2007, 10:02 PM   #16
forr is offline forr  France
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To avoid to build speakers un-necessarily going too low, this is an average room response published in the JAES paper,
"Subwoofer performance for accurate reproduction of music"
by Fielder and Benjamin
Attached Images
File Type: jpg fielderbenjamin_roomresponse.jpg (12.1 KB, 2547 views)
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Old 26th August 2007, 10:17 PM   #17
Daveis is offline Daveis  United States
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forr, what you're saying matches Rob.

Apparently, most rooms have gain from 30-60 hz. I should go for a oversized/tuned low/EBS vented such as referenced on

http://www.danmarx.org/audioinnovation/theories.html
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Old 26th August 2007, 10:19 PM   #18
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Quote:
Originally posted by forr
To avoid to build speakers un-necessarily going too low, this is an average room response published in the JAES paper,
"Subwoofer performance for accurate reproduction of music"
by Fielder and Benjamin

That pretty much equals my room, but the gain stopped at 12Hz so I guess room construction plays a part.
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Old 26th August 2007, 10:40 PM   #19
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Hi Rob,

I used to think 'sub' was short for subsonic but subsonic means below the speed of sound. Not related to frequency.

Infrasonic is the area below 20Hz (apparent threshold of human hearing). Daveis was asking about about 10Hz.

You need a 'sub' to go 'infra'

I'll never figure it all out. Better just change my sig line
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Old 27th August 2007, 01:20 AM   #20
Daveis is offline Daveis  United States
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Some more research.

http://www.hometheatershack.com/foru...t-summary.html

It looks like 1% THD at 20hz is doing good.
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