NetNews Usenet Archive 1992 #31/NN_1992_31.iso/spool/rec/audio/car/5470

Text File | 1992-12-23 | 1.9 KB | 38 lines

Newsgroups: rec.audio.car
Path: sparky!uunet!wupost!darwin.sura.net!gatech!emory!sol.ctr.columbia.edu!eff!news.oc.com!wizard!jdavis
From: [e-mail] (Jason Davis)
Subject: Re: Why so much power?
Message-ID: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail] (Jason Davis)
Organization: East Texas State University, Commerce, TX
References: <[e-mail]>
Date: Wed, 23 Dec 1992 06:41:23 GMT
Lines: 25

...something else to consider for automotive power requirements is the
variable noise floor present in automobiles.  The need for ample headroom
is made even more crucial by the high noise floors in some vehicles.  It
is well established that a system will run more efficiently when there is
more power available than the speakers normally require to operate at a
comfortable listening level.  This is known as headroom which allows the
amps to run cooler and safely below the voltage rails of the amplifier.
When you do things in a car such as rev the engine, drive with the windows
down, etc. you increase the amount of ambient noise (noise floor) perceived
in the interior.  It is therefore necessary to have amplifiers with enough
headroom to allow you to increase the volume enough to compensate for the
increase in noise so it can be heard.  I know that driving at 80mph with
my windows down with the twin firestick antennae and dual-band HAM antenna
on my truck it takes most of the 695W I'm running in my truck to overcome
the wind noise.

   Hope this helps clarify neighbor :-)  (Dallas to Klondike = 65 mi. N.E.)

-Jason Lee Davis

)
   /|  Jason Lee Davis                        <[e-mail]>  |\
||/_|  Shiloh Productions sound co. ____      <[e-mail]>  |_\||
||\ |  Rt. 1  Box 175              (_ |_)     <[e-mail]>  | /||
   \|  Klondike, Texas 75448 ________)| _____ [phone]            |/