Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

---

[ Follow Ups ] Thread: [ Display  All  Email ] [ Propeller Head Plaza ]

---

[ Alert Moderator ]

---

Re: Using transformers to up the Q of extended range drivers .....

Posted by tomservo (M) on October 16, 2006 at 13:07:24

In Reply to: Re: Using transformers to up the Q of extended range drivers ..... posted by Soundmind on October 16, 2006 at 10:48:35:

Hi

The real usefulness in the method I suggested is that it lifts up the bass without needing any additional voltage swing. Keep in mind that a +6 dB boost anywhere means your amp will run out of gas at that frequency 6 dB sooner than everywhere else.
In the case of a sealed box that is over damped, or, in an open baffle using a vented box driver (also an over damped alignment), one has an over damped response at the low cutoff.
How this can be partly compensated can be seen if you examine the electrical impedance.
You see a large peak at resonance (the low corner).
The Filter can resent at temporarily higher impedance AND at the same time, generate a drive voltage greater than the input voltage.
When you lift the low corner of an overdamped system this way, you see the extra “power” needed to fill in the low end comes from the impedance peak being greatly reduced (like a vented box does).
What it doesn’t get around is and Xmax issues.
A technical discussion, how refreshing.

Tom Danley

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---