The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
References: <3DBC76E9.F9DA95C2@managesoft.com> <3DBC7B38.C7EB8A43@webaccess.net>
Subject: Re: Speaker phase and current vs voltage drive
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Mon, 28 Oct 2002 02:30:23 GMT
NNTP-Posting-Date: Sun, 27 Oct 2002 18:30:23 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> Voice coils are usually spring suspended. Below the spring mass
> resonance, the voice coil displacement is nearly proportional to current
> (voltage also because the principle electronic resonance is much
> higher). Above the spring mass resonance, acceleration is proportional
> to current. This is really the nearly linear regime because sound
> pressure is proportional to acceleration rather than amplitude or
> velocity. Cross over is needed because the speaker may have to vibrate
> in a higher mode than the fundamental.
> ... The times have been,
> That, when the brains were out,
> the man would die. ... Macbeth
> Chuck Simmons firstname.lastname@example.org
What is the reason that speakers aren't current controlled?
I seem to remember some experiments done (a while ago) using
current-controlled amplifiers (i.e., transconductance). As I recall, the
problem was that the speaker enclosure resonances would have a bigger effect
on the response -- as compared to the same speaker driven from the low
output impedance of a voltage amp.
Any insight into this?
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup