Looking for active bass equalisation - Any equivalents to "Golden Flutes" ? - Page 2 - diyAudio
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Multi-Way Conventional loudspeakers with crossovers

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Old 5th October 2012, 12:38 PM   #11
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clubsport911's Avatar
Join Date: Apr 2005
Location: Cheltenham, Glos.
You could rig up a Linkwitz transform circuit.
Look here for the theory and the project and a spreadsheet for calculations
I like this ! Seemingly simple, but my only issues is somehow discovering the data on the drivers and cabinet.

The deisgners of the 105/3's are not exactly on display !

Good call though - thanks
The older I get, the fitter I was !
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Old 5th October 2012, 12:44 PM   #12
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Join Date: Jan 2006
Location: Athens, GA
You could pick up an equalizer for some of the older Thiel speakers such as the CS3.5. These go for around $100. Some people ditched the equalizer and used the "Golden Flutes." It is possible that the GF were made for specific speakers, but I can't recall. This Thiel equalizer has a switch to boost 20 Hz or 40 Hz, see attached graph for measured response, pilfered from the stereophile site:

Thiel CS3.5 loudspeaker Measurements | Stereophile.com
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File Type: jpg thiel.jpg (33.5 KB, 58 views)

Last edited by DreadPirate; 5th October 2012 at 12:50 PM.
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Old 5th October 2012, 04:47 PM   #13
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Join Date: Jan 2008
Originally Posted by clubsport911 View Post
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.

The 105/3's frequency response being -2.5 at 49 Hz would indicate that even moderate boosting below that point would probably just result in over excursion, bandpass designs often roll off at 24 dB per octave.

Adding a sub for frequencies below 50 Hz would take care of the lack of LF without adding distortion.
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Old 5th October 2012, 10:42 PM   #14
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Join Date: Aug 2012
Yes an L-T transformed sub woofer is probably your best option.
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