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

Multi-Way Conventional loudspeakers with crossovers

Looking for active bass equalisation - Any equivalents to "Golden Flutes" ?
Looking for active bass equalisation - Any equivalents to "Golden Flutes" ?
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 Search this Thread
Old 3rd October 2012, 07:51 AM   #1
clubsport911 is offline clubsport911  United Kingdom
diyAudio Member
 
clubsport911's Avatar
 
Join Date: Apr 2005
Location: Cheltenham, Glos.
Question Looking for active bass equalisation - Any equivalents to "Golden Flutes" ?

I am considering active bass equalisation - the kind of device like the (now obsolete ?) Golden Flute. These are fitted between pre and power amplifiers with the specific aim of providing low frequency extension / boost.

I'm aware that these (Golden Flutes) are now out of production, but has anyone got any recommendations for similar devices I can obtain to achieve the same effect ?

Happy to DIY [to a certain extent] No effect above 100hz required (or even 60 to be honest !)

Thanks
__________________
The older I get, the fitter I was !

Last edited by clubsport911; 3rd October 2012 at 10:08 AM. Reason: Spelling mistakes corrected
  Reply With Quote
Old 4th October 2012, 06:55 AM   #2
rcw666 is offline rcw666
diyAudio Member
 
Join Date: Aug 2012
I have had a bit of a look on the net and can't find reference to the golden flute, exactly what did it purport to do?
rcw
  Reply With Quote
Old 4th October 2012, 07:38 AM   #3
clubsport911 is offline clubsport911  United Kingdom
diyAudio Member
 
clubsport911's Avatar
 
Join Date: Apr 2005
Location: Cheltenham, Glos.
The GF sits between pre and power amp and added a carefully engineered amount of low frequency equalisation. It did this with ( In theory) no effect to upper bass, midband or hf.

It was possible to adjust extension, curve and point of operation.

Interestingly, I only heard about these a few weeks back and found information pretty quickly !

In summary, it's a very high quality LF only tone control.
__________________
The older I get, the fitter I was !
  Reply With Quote
Old 4th October 2012, 08:11 AM   #4
Draki is offline Draki  Macedonia
diyAudio Member
 
Join Date: Sep 2010
Location: Macedonia
Maybe this: subwoofer equalizer, bass correction equalizer, bass boost
  Reply With Quote
Old 4th October 2012, 08:40 AM   #5
ashok is offline ashok
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
Looking for active bass equalisation - Any equivalents to "Golden Flutes" ?
Allison seems to have had a similar device. It was called the Alison Electronic Subwoofer. I've heard one with an Allison speaker. Went quite low but didn't have 'slam' !
You could rig up a Linkwitz transform circuit.
Look here for the theory and the project and a spreadsheet for calculations.

ESP - The Linkwitz Transform Circuit
Linkwitz Transform Subwoofer Equaliser
__________________
AM
  Reply With Quote
Old 4th October 2012, 09:24 AM   #6
ashok is offline ashok
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
Looking for active bass equalisation - Any equivalents to "Golden Flutes" ?
Check this link for the Allison Equaliser . Scroll down .

http://www.roger-russell.com/equalizers/equalizers.htm
__________________
AM
  Reply With Quote
Old 4th October 2012, 09:24 AM   #7
phase_accurate is offline phase_accurate
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
The "Bassis" thing is actually something like the Linkwitz transform with adjustability via pots.
The main use of the LFT is closed boxes. There are of course other schemes as well like shelving filters, parametric EQ, Highpass filters with a hump etc.

The highpass for instance can be of advantage when protection from overexcursion is higher on your list than group-delay distortion. I once derived a circuit that did dynamically alter the height of the hump and the cutoff frequency.

Regards

Charles
  Reply With Quote
Old 4th October 2012, 09:42 PM   #8
weltersys is offline weltersys  United States
diyAudio Member
 
weltersys's Avatar
 
Join Date: Jan 2008
Location: Florida
Quote:
Originally Posted by clubsport911 View Post
The GF sits between pre and power amp and added a carefully engineered amount of low frequency equalisation. It did this with ( In theory) no effect to upper bass, midband or hf.

It was possible to adjust extension, curve and point of operation.

Interestingly, I only heard about these a few weeks back and found information pretty quickly !

In summary, it's a very high quality LF only tone control.
What you describe and far more can be done with the MiniDSP, or most any DSP (digital signal processing) unit.

By inserting the DSP in a tape loop available on most receivers, separate power amps for the bass are not needed to effect the change.
  Reply With Quote
Old 5th October 2012, 12:21 AM   #9
rcw666 is offline rcw666
diyAudio Member
 
Join Date: Aug 2012
Perhaps you can indicate what sort of a set up you have.

The difficulty with and equalization of this sort is that you can very quickly run out of cone excursion and amplifier power.

Just taking any old thing and boosting the bass to fix it doesn't work very well at all. rcw
  Reply With Quote
Old 5th October 2012, 01:11 PM   #10
clubsport911 is offline clubsport911  United Kingdom
diyAudio Member
 
clubsport911's Avatar
 
Join Date: Apr 2005
Location: Cheltenham, Glos.
Quote:
Perhaps you can indicate what sort of a set up you have.
Sure... I have a 400W MF amps (40A current output continuous), MF Pre-amp and KEF 105/3's. The 105/3's are bandpass Coupled Cavity Designs and also were configured to work with and without the KEF KUBE 200 active equalisation.

I could search forever to find a KUBE 200 or perhaps take advantage of higher capability (lower cost ?) more modern electronics that have even less insertion loss. I definately do not want to touch the midband. On my system, it's great.

Thanks
__________________
The older I get, the fitter I was !
  Reply With Quote

Reply


Looking for active bass equalisation - Any equivalents to "Golden Flutes" ?Hide 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
4-way Active (3+1 way) TL 15" 8" 3" 1" cka3o4nuk Multi-Way 44 25th April 2011 03:26 PM
Please recommend a 4 or 5" FR for Open baffle w/ active bass augmentaion JandG Full Range 19 9th July 2010 06:54 AM
question regarding "golden ratio" Jeb-D. Full Range 3 28th May 2006 11:39 AM
10" basS/mid for "party-speaker" TroelsM Multi-Way 0 17th September 2005 12:14 AM
Active Room Equalisation annex666 Everything Else 15 13th January 2003 01:24 PM


New To Site? Need Help?

All times are GMT. The time now is 03:23 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki