Go Back   Home > Forums > >

Horn tuned for 22Hz from the 1980's
Horn tuned for 22Hz from the 1980's
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old 28th June 2020, 01:21 PM   #1
madam is offline madam  Hungary
diyAudio Member
 
Join Date: Apr 2008
Default Horn tuned for 22Hz from the 1980's

I just found a really old speaker plan.

It is a folded horn that is tuned for 22 Hz, and have an efficiency more than 20%

Any idea of it?

Can someone tell me some pros and cons of it?

Is it really tuned for 22Hz ?

THX
Attached Images
File Type: jpg szekreny.jpg (72.4 KB, 496 views)
  Reply With Quote
Old 28th June 2020, 03:06 PM   #2
Galu is offline Galu  Scotland
diyAudio Member
 
Join Date: Apr 2018
Quote:
Originally Posted by madam View Post
Can someone tell me some pros and cons of it?

Is it really tuned for 22Hz ?
I'll start the ball rolling by telling you what I've read. The horn experts are then bound to join in!

Mounting the driver so that it drives into a horn flare increases efficiency and directivity control.

The rear of the driver is enclosed in a small rear chamber to limit cone excursion.

Flare rate and and mouth size of the horn will typically limit the horn response to above 150Hz for all but the largest mouth sizes.

Axial sound pressure increases in the order of 6dB are typical in the lower midrange, at the expense of low and high frequency response reduction outside the active horn pass-band.
  Reply With Quote
Old 28th June 2020, 03:08 PM   #3
weltersys is offline weltersys  United States
diyAudio Member
 
weltersys's Avatar
 
Join Date: Jan 2008
Location: Florida
Fairly typical "W" bin design, there have been many over the past 90 years or so.

Path length of the horn is about 180 centimeters, which would put the 1/4 wave length tuning (Fc) about 48 Hz.

Pros:High efficiency.
Cons: Very large and heavy for a relatively high Fc.
  Reply With Quote
Old 29th June 2020, 02:12 PM   #4
jo bg is offline jo bg  Italy
diyAudio Member
 
Join Date: Dec 2015
Quote:
Originally Posted by weltersys View Post
Fairly typical "W" bin design, there have been many over the past 90 years or so.

Path length of the horn is about 180 centimeters, which would put the 1/4 wave length tuning (Fc) about 48 Hz.

Pros:High efficiency.
Cons: Very large and heavy for a relatively high Fc.
in other words no chance of serious output at 22 hz, nor at 30, horn should be double the lenght to load properly that low.
22 hz to 350 is too wide a bandwidth for a horn like this anyway,
if that is what you need you better look at front radiators, or splitting the range between different cabs.
  Reply With Quote
Old 18th July 2021, 05:29 PM   #5
madam is offline madam  Hungary
diyAudio Member
 
Join Date: Apr 2008
Pretty many people around built this horn.

If it could be fitted with a Martin Audio DLS 846 (B&C PZB100, best of my knowledge) it might rock the surrounding for sure.

the 48Hz is about the double of the mentioned 22 HZ, so .....

Could this be better in the low-end than a Martin Audio WSX for example?

Thanks in advance
  Reply With Quote
Old 18th July 2021, 09:08 PM   #6
weltersys is offline weltersys  United States
diyAudio Member
 
weltersys's Avatar
 
Join Date: Jan 2008
Location: Florida
Quote:
Originally Posted by madam View Post
Could this be better in the low-end than a Martin Audio WSX for example?
The Martin Audio WSX horn path length is 7ft (2.1 meter), around a 40Hz Fc. I'd expect the WSX to go around 1/3 octave lower in response than the design in the OP, with a slightly more abrupt drop near Fc.
  Reply With Quote
Old 19th July 2021, 11:58 PM   #7
norman bates is offline norman bates  United States
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
madam,

I am no expert, but have been very disappointed seeing what people call a bass horn's measurements tested in the middle of a parking lot...……………..
Even some (some) tapped horns using low qts drivers causing a drooping response, like -6db@30hz compared to 100hz, not flat to 40hz at all. I think 2 porteds taking up the same total box area would be better.

looking at that w-bin, wow

86" wide mouth x 38" tall mouth x 31" deep...……………….
Horn length looks to be at least 6'long , so 1/4 wavelength of 50hz...…………

I think it would do massive, massive, 60hz on the floor, ideally in a concrete wall/floor or better yet a corner.

I like that the horn will add up to +6db of gain (maybe more), but that you be almost impossible to move (400+ lbs ?).

I think nowadays, based on size, cheaper power, portability, no way.
40hz I think would be ideal, and you port a sub at 40hz then subsonic it, you can get very loud.

Doesn't mean I wouldn't like that giant thing...…………………..
I bet I'd love it.
For 60hz and up anyway...……………………...

Last edited by norman bates; 20th July 2021 at 12:03 AM.
  Reply With Quote
Old 22nd July 2021, 07:45 AM   #8
VECTORDJ is offline VECTORDJ
diyAudio Member
 
Join Date: Oct 2011
This design is a Theater horn from 40s/50s. Used by many big Rock Bands in the 70s.
  Reply With Quote
Old 22nd July 2021, 02:46 PM   #9
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Horn tuned for 22Hz from the 1980's
Right.

Why is OP so surprised that some liar says "22 Hz"?

As much as I like the sound (lived 45 yrs with a Klischhorn in my corner), once the horn-effect ends, not a lot below. The famous Klipsch goes down to about 35 HZ and that's truly excellent bass (even organ music) but not gut-rumbling by today's standards.

There are good reasons to crave the benefits of a true horn (TH is NOT a horn). But hopeless to expect modern sub-woofer bass unless gigantic in size.

On the other hand, you'd be surprised how many folks think rock music with no output below 50 Hz to be great bass even today.

B.
__________________
HiFi aspirations since 1957. "When the toilet paper of Experience is depleted, the backside of Reason goes unwiped"

Last edited by bentoronto; 22nd July 2021 at 02:51 PM.
  Reply With Quote
Old 22nd July 2021, 06:07 PM   #10
weltersys is offline weltersys  United States
diyAudio Member
 
weltersys's Avatar
 
Join Date: Jan 2008
Location: Florida
Quote:
Originally Posted by bentoronto View Post
Right.

Why is OP so surprised that some liar says "22 Hz"?

As much as I like the sound (lived 45 yrs with a Klischhorn in my corner), once the horn-effect ends, not a lot below.
Ben,

We don't know if someone told Madam the horn was "tuned for 22Hz", or that was simply derived from the "(22 Hz...300-350Hz)" response range printed on the plans in the OP.

Although it's horn path length is not long enough to support a 22 Hz Fc, the output below Fc will be similar to that of the drivers in a sealed enclosure with volume the same as the compression chamber, which would extend to 22Hz without the sensitivity provided by the exponential horn.

Art
  Reply With Quote

Reply


Horn tuned for 22Hz from the 1980'sHide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SX-1980 - Outputs santacruztv Solid State 1 15th December 2019 12:33 PM
1980's DIY Speakers TheRealMadScientist Multi-Way 1 7th February 2016 07:05 PM
Pioneer Sx-1980 Help jleaman Solid State 7 10th May 2010 12:04 PM
BIG exponential sub tuned to 22Hz madam Subwoofers 11 4th January 2009 04:29 PM
How to use SAE A501 Amp, 1980's 321uam Solid State 2 25th September 2004 08:32 AM


New To Site? Need Help?

All times are GMT. The time now is 12:19 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki