Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Bicor Horns
Bicor Horns
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
Thread Tools Search this Thread
Old 25th January 2017, 11:36 AM   #1
Zero D is offline Zero D  United Kingdom
diyAudio Member
Join Date: Aug 2009
Arrow Bicor Horns

Not new, but it is to me ! & appears interesting in several ways.

The "Academy" Lowther enclosures which this test is about are a little unusual: there are two drivers, both full-range. One of them is located in the top panel and points back and up at 25 degrees from horizontal.


The front driver is loaded by a quarter-wave horn whose mouth is placed at the bottom of the rear panel. It is folded many times within the enclosure, for a total length of about 1.7 metres. This horn is partially shared with the top driver. The top driver's compression chamber in fact has two openings, the first being connected to the one for the front driver, the second opening into a tuned chamber with a laminar vent. This vent is 36 cm. (about 14 in.) long and is placed on the rear panel just above the horn mouth. No absorbent material whatever is used because the design, dubbed a "Bicor system", prevents the formation of the standing waves that are typical of labyrinth enclosures.

Lowther SonImage
There are various different models, but all share the Bicor concept.

1 - Has anyone heard such a design, doesn't have to be a Lowther, if so ?

2 - Concentrating on only the bass aspect, any Real benefits ?

3 - Can this be modelled ?
Rice Kellog still going strong Not sent from a SpyPhone with CrapApps etc
  Reply With Quote
Old 25th January 2017, 07:03 PM   #2
tb46 is offline tb46  United States
diyAudio Member
Join Date: Jan 2006
Location: Texas
Hi Zero D,

I think Lowther is the only company that used this combination of design features.

- It could well be that there are some benefits to be had with this design, but, it looks like too much effort/complexity if you're just looking @ the bass range.

- It would be hard to come up w/ an AkAbak simulation that reflects all aspects of the design. The internals would not be too bad individually, but, this loudspeaker interacts so strongly with the environment, that any simulation would have to include environmental features like walls, location of drivers and direction of radiation.

Also, it is a full range loudspeaker, so maybe you'd have more luck in the Full Range Forum?

  Reply With Quote
Old 25th January 2017, 07:13 PM   #3
just a guy is offline just a guy  Canada
diyAudio Member
Join Date: May 2006
You talkin about this thing?

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

There's a better picture of it here - http://www.lowtherloudspeakers.com/drawings/academy.pdf

You can sim it with Akabak and if built as a subwoofer you don't have to worry about the drivers being in different positions and pointed in different directions, the sim will be fine because it will be mostly omni at sub frequencies.

So you've got two drivers, each entering the line at different positions. You've got three chambers and two vents.

Theoretically if you wanted to spend a few hours (or days or possibly even weeks or months) trying to perfect a sim you might see some advantage over a regular BLH.

BUT in this case, these designs are probably decades old and designed without any strategy or simulation aids so they are probably just a mess in terms of measurable metrics.
  Reply With Quote
Old 26th January 2017, 12:01 PM   #4
Zero D is offline Zero D  United Kingdom
diyAudio Member
Join Date: Aug 2009
@ tb46

I found other companies still offering these designs & builds for sale.

One of the main benefits they "claim" to provide that interested me was, prevents the formation of the standing waves that are typical of labyrinth enclosures

@ just a guy

Yeah, that's one of several options i saw. Yes i expect they were originally trial & error designs = a Lot of sawdust etc ! If someone could sim it, one day, that would be Very revealing
Rice Kellog still going strong Not sent from a SpyPhone with CrapApps etc
  Reply With Quote


Bicor HornsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Yamaha horns for JA-4201 and TOA horns -- NH USA -- Jimmy154 Swap Meet 0 15th May 2016 05:18 PM
smith horns and using compression horns for a Karlson party speaker project bikehorn Multi-Way 14 30th January 2013 06:20 PM
[ Group horns buy from hORNS - join for free shipping and 10% off ] gregdee Group Buys 0 28th October 2012 02:21 PM
Horns inside of horns open foe discussion oilcanracer Multi-Way 3 15th February 2010 04:42 AM
Horns: Vibrations and resonances in metal horns Rocky Multi-Way 10 28th July 2004 02:38 AM

New To Site? Need Help?

All times are GMT. The time now is 12:41 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio