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Old 12th January 2011, 03:22 PM   #71
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AceBass is, simply, a synthesis of loudspeaker parameters, by changing how the amplifier's output impedance looks to the speaker. You can (without physically altering the driver) give it a lower resonance, higher Qts, and many other things.
Someone once set up a computer program to set them in real-time.
Using such a system, an example was given of a pair of 6.5" midbass drivers hitting silly SPLs (something like 120dB@1m) down to 40Hz.

It's very neat, if you can do it right. You need a dedicated amplifier and a "suitable" speaker for it.
Hopefully, someone'll have a link to the original article.

My work:
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Old 12th January 2011, 05:12 PM   #72
bjorno is offline bjorno  Sweden
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Thumbs up ACE Bass

Originally Posted by chris661 View Post
AceBass is, simply, a synthesis of loudspeaker parameters, by changing how the amplifier's output impedance looks to the speaker....Hopefully, someone'll have a link to the original article...Chris
Start here:

ACE-bass amplifier design

This tread ends with presenting Baldin's very promising(AC-stable) ACE Bass clone design that is the best I've seen so far using up to date components.

PS: My old design is an internally DC-stable design but trickier to adjust for good long term stability( <=10 Years: typically needs 8 years re-trimming intervals if used heavily at a daily rate ) that depends both on aging driver parameters and of the component aging/drift of the ACE-Bass amp itself.

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Old 12th January 2011, 06:45 PM   #73
Baldin is offline Baldin  Denmark
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Thanks bjorno for the kind words
Best source is the AES paper by Karl Erik Stahl, but you'll have to pay 20$ .... 95% the same is the patent: Loudspeaker lower bass response using negative resistance and impedance loading

Also take a look at by blog for further information on calculations sheet and a step by step guide etc: AceBass up and running | Baldin's Blog

Best regards Baldin
Visit or read latest news on Baldin's Blog
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Old 22nd January 2011, 08:02 AM   #74
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Thanks Everybody for briefing me on ACE-BASS. I had googled for it seems to be a bit deep subject. I ll do it later. ofcourse wont be able to understand it without your help. but durrently we r discussing LT,Peaking filter, and ACE-Bass. all three at a time is getting bit heavy for my small brain. So decided to keep ACE-BASS for later.

Instead use a peaking 2nd order high pass filter for a 6th order response.

This should be an overdamped alignment say 6th order Bessel, Butterworth
would sound pretty dreadful. the lowest pole will be the 2nd order hp filter,
and making the Q of this adjustable makes for a relatively flexible system.

e.g. for a typical driver compared to Butterworth vented:
Somewhat increase box volume and detune the port for maximum F-12dB.
The hp filter is tuned lower than the port with maximum gain near Fport.
Use the filter to get back some gain but not all, count on room gain.

This will work better than an LT, with far better control of excursion.

rgds, sreten.[/QUOTE]

Sreten, I am trying to work on your advice. I have some old trial enclosure. I would adjust its volume to get the desired one.

BTW, what role does a group delay play? I have noticed that group delay goes very bad when filters are used. can some one throw light on this?
There is always a first time....
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