TIP: Click on subject to list as thread! ANSI
echo: audio
to: BONNIE GOODWIN
from: T OWEN
date: 1996-08-10 18:27:00
subject: Re: Impedances

-=> Quoting Bonnie Goodwin to Drew Hohmann <=-
 DH> It's widely known that running amplifiers below certain load
 DH> levels (usually 4 ohms), the amplifier has less and less control
 DH> over the speaker movement, causing distortion.  This is mostly
 DH> seen in groups of subs wired in parallel, down to an ohm or so.
 BG> I don't believe that is actually true, but often it results in
 BG> distortion, since the amp is working much harder at a lower impedance,
 BG> often exceeding the capabilities of the amp, which was why you made
 BG> the observation above. Actually, damping factor (control over the
 BG> speaker in essense) increases the lower the impedance. This is a
 BG> good thing for subs, as the amp is able to dump more power to the
 BG> speakers and have better control.
What? Damping factor *increases* with lower impedance? How is that?
I have never seen anyone claim that; in fact, quite the opposite.
I am aware that lower impedances will allow better power transfer,
but in my experience, the "damping factor" falls off, rather than
increasing with lower impedances. Most amp manufacturers state in
the spec sheets that "damping factor" is best at 8 Ohms, and gets
progressively worse with lower impedances. Most interesting!
Take care, and nice to see the "car audio" ousted!
... "Don't be so sentimental, mother. Things explode every day."
--- Blue Wave/DOS v2.30
---------------
* Origin: Computer Castle / 20 Lines / Newton, NH / 603-382-0338 (1:324/127)

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