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-   -   can you buy preassembled servo feedback systems for subwoofers? (

pkgum 9th December 2001 05:44 AM

Is there a company in existance that assembles servo feedback systems that is customed designed according to the buyers needs ?

ThomasW 9th December 2001 05:56 AM

No. It must be custom designed and purpose built for the specific driver, cabinet, and amp

You might be better served fixating on something else. There's a reason why only a few companies use this technology........

The distortion isn't all that high in current high-end subwoofers. If it were a major issue, don't you think everyone would be jumping on the Servo bandwagon?

pkgum 9th December 2001 07:41 AM

"There's a reason why only a few companies use this technology........"

some famous subwoofer companies use this technology

I have rarely seen simple high end subwoofers that are only composed of a box, a driver, a amp, and a filter.

"You might be better served fixating on something else."

What else can i fixate on?

Won 9th December 2001 08:58 AM

The linkwitz transform circuit is pretty simple as circuits go, both to construct or to understand. Try looking at Rod Elliot's website: He has plans for both Linkwitz transform and ELF circuits.


pkgum 9th December 2001 09:57 AM

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

so do you just figure out the values of the components in this circuit by using the spreadsheet supplied in the esp website and then i can just get someone to construct the circuit...right?

im all this the right circuit? I am bridging the amp so more power is extracted, this power will run the sub.

[Edited by pkgum on 12-09-2001 at 05:01 AM]

pkgum 9th December 2001 10:47 AM

Using simulation software i figured out that all the circuit does in my sealed BP 1503 subwoofer is to flatten the response
Without the linkwitz circuit the response in the upper bass frequencies are louder but the SPL in the low 20Hz - 40Hz frequency response is the same

So in conclusion theres no piont using a linkwitz transform circuit when trying to create more SPL in the lower frequencies in sealed enclosures.

anyone disagree?

AudioFreak 9th December 2001 11:45 AM

pkgum nothing will get you higher spl in the lower frequencies except adding more drivers or using bigger ones and using a box that is the right size for the drivers..... the servo wont buy you more spl at lower frequencies because the driver simply cant move enough air without exceeding Xmax. If you want lower bass without adding more drivers or passive radiators and still want a flat response in a sealed box then all the circuits work the same as each other ....... and you lose efficiency in the higher frequencies.

[Edited by AudioFreak on 12-09-2001 at 07:13 AM]

pkgum 9th December 2001 12:36 PM


You can get more bass SPL's. If you were true then how did the sunfire subwoofer produce its bass out of a small sealed box? By equalization and alot of amp power

AudioFreak 9th December 2001 12:41 PM

the linkwitz transform circuit is there to give you a flat response down to a lower -3dB frequency but at the expense of spl. Nothing and i mean NOTHING can get you higher spl at low frequency except by displacing more air which means increasing cone area or increasing excursion and excursion is already at its limit at the lower spl figure. If you would like to know more read

[Edited by AudioFreak on 12-09-2001 at 07:49 AM]

pkgum 9th December 2001 01:10 PM

why would anyone want a flatter response as a trade off for SPL?

explain to me how did the sunfire subwoofer(as well as many other high spl tiny box subs) produce its 16Hz bass out of a small box ?

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