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Old 2nd January 2009, 06:10 AM   #1
madam is offline madam  Hungary
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Default BIG exponential sub tuned to 22Hz

Hi Everyone...... and a Happy New Year!!!!

I've just finished a crazy sub.... It's tuned to 22Hz.

I use a Peerless XLS-12 (830500 if I'm right) and it rocks the house 4 only 2 watts!!!!!


The drawing contains MILIMETERS!!!!!!
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Old 2nd January 2009, 11:46 AM   #2
carolus is offline carolus  Belgium
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Default sub exp 22Hz

....my best wishes for this "new" year ....
You are a lucky man with your construction (home made?).....congratulations.
What is your configuration (2/3/4 way or more) and filter (passif/actif)?
Al horns (drivers)?
Allez, salukes
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Old 2nd January 2009, 12:22 PM   #3
Dr_EM is offline Dr_EM  United Kingdom
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Sounds awesome, got any photos of your construction? Drawing suggests it would just barely be able to stand tall in the average room, full floor to ceiling.
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Old 2nd January 2009, 01:14 PM   #4
MaVo is offline MaVo  Germany
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I am interested in doing something similar. Can you post your simulations please? On a sidenote, the path looks rather short for a 22hz tuned horn.
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Old 2nd January 2009, 07:39 PM   #5
madam is offline madam  Hungary
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Default Re: sub exp 22Hz

Quote:
Originally posted by carolus

You are a lucky man with your construction (home made?).....congratulations.
What is your configuration (2/3/4 way or more) and filter (passif/actif)?
Al horns (drivers)?
Allez, salukes
Defenetly not home-made. I chose a Corp. with CNC machines and other stuffs!! It must be made perfect... otherwise.... unwanted vibrations

Quote:
Originally posted by Dr.EM
Sounds awesome, got any photos of your construction? Drawing suggests it would just barely be able to stand tall in the average room, full floor to ceiling.
I made it as cut it in half (longways) Use only 1 speaker. ..... but U can lay it on it's side...... (even use it as a bed

Quote:
Originally posted by MaVo
I am interested in doing something similar. Can you post your simulations please? On a sidenote, the path looks rather short for a 22hz tuned horn.
This is from the late 70's early 80's...... It's made with compromises...... you would need at least double size horn for 22 Hz..... (you couldn't moooooove it.... even the 1 speaker construct weights with 30mm MDF/plywood something about 120-130 Kgramms)
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Old 3rd January 2009, 09:04 PM   #6
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Quote:
This is from the late 70's early 80's...... It's made with compromises...... you would need at least double size horn for 22 Hz.....
Still the horn path seems more like a 1/4 wave length of 45 -50 Hz (rough quess). Where does the quoted 22 Hz originate from and how much dB is it down?

Best regards Johan
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Old 3rd January 2009, 09:17 PM   #7
AndrewT is offline AndrewT  Scotland
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one can truncate a 22Hz exponential horn, but this is simply a pair of W type upper bass horns.
It will not reproduce well down to 22Hz, no matter what drivers are put in there.

It's certainly not a sub-bass horn.
Quote:
This is from the late 70's early 80's......
It's more likely to be a copy of a small cinema speaker from the pre-war era.
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Old 3rd January 2009, 11:19 PM   #8
Horexx is offline Horexx  Germany
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This project reminds me of the
D.B. Keele: K151 or 2240H "W" Horn
http://www.geocities.com/loudspeaker...eele_W_Box.doc

A simulation of an 18 Hz Sub you can find here:
http://www.audioheritage.org/vbullet...ad.php?t=14848
Some comments are added.

Peter
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Old 4th January 2009, 04:42 PM   #9
djk is offline djk
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The design shown is an adaptation of the Olson (RCA) bass horn, adopted for the Shearer (MGM) system.

The original performance with a stacked pair in 4Pi with wings was 55hz.

In 2Pi they are good to 40hz (from personal experience).

Click the image to open in full size.
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Old 4th January 2009, 05:13 PM   #10
Eva is offline Eva  Spain
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Considering the dimensions shown in the drawing from the first post, it looks like a 45Hz horn. This is unless something important is missing.
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