Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site watmath.UUCP
Path: utzoo!watmath!hachong
From: hachong@watmath.UUCP (Herb Chong)
Newsgroups: net.audio
Subject: Re: source of data on transient response in receivers
Message-ID: <16563@watmath.UUCP>
Date: Mon, 23-Sep-85 17:01:05 EDT
Article-I.D.: watmath.16563
Posted: Mon Sep 23 17:01:05 1985
Date-Received: Tue, 24-Sep-85 03:23:59 EDT
References: <126@ur-tut.UUCP>
Reply-To: hachong@watmath.UUCP (Herb Chong)
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 32
Summary: 

In article <126@ur-tut.UUCP> tuba@ur-tut.UUCP (Jon Krueger) writes:
>I'm looking to buy (upgrade) a receiver in the 150-300 range.  I
>don't need more than 35 watts for my tastes and speakers.  But I've
>heard that buying more power than that may also buy me more headroom
>for sudden but brief peaks in music.  These "transients" may zip up
>to 100 watts, although not often or for long.  I can't seem to find
>any vendor specs on their product's performance in this area.  Can
>anyone give any pointers to technical writeups or lab test data?

the IHF dynamic headroom specification is exactly what you are looking
for, but it's a secondary specification, which means that a
manufacturer is not required to give it.  it is given in dB above the
rated RMS power for a pulsed signal of a given duty cycle.  i seriously
question whether in your price range you will find an amplifier that
will give the kind of headroom you are looking for, especially in a
reciever.  that's just over 4.5 dB of dynamic range.  in separate amps,
the figure is high, but not unheard of.  some manufacturers in that
price point would have at best about 1 dB of IHF dynamic headroom, but
the majority woulf have less than that.  it costs too much to build a
power supply with the necessary higher voltage components.  you also
have to be careful what rated load is used for the IHF dynamic headroom
specification.  most amplifiers have larger headroom into a lower impedance
load.

Herb Chong...

I'm user-friendly -- I don't byte, I nybble....

(will disappear September 30)
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