[Vintage-Audio] Re IHF Rating System

[Duane Fischer, W8DBF]

Technically RMS did come first, but it was not mentioned very often. Mostly peak
power to impress potential buyers. Then IHF was supposed to be more 'accurate,
of course then a real focus on RMS on a continuous level. The manner in which
horsepower and output wattage were calculated were both changed in the late
sixties. Must have been the time for mor ehonesty - 	
  

----------
From: Robert    J.  McKee <mckee137 at mindspring.com>
To: Vintage home and professional audio equipment from 1975 back
<vintage-audio at mailman.qth.net>
Subject: Re: [Vintage-Audio] Re IHF Rating System
Date: Tuesday, June 15, 2004 1:19 AM

Smoke and mirrors, Duane, smoke and mirrors.

BTW, the RMS system was first.  THen the
IHF system came along to make the mid-fi
and consoles look good.  And of course the
legit dealers selling real hi-fi had to explain
to potential customers the effect of smoke
and mirrors raising the numbers to sucker
in some more business.

Bob McKee


----- Original Message ----- 
From: "Duane Fischer, W8DBF " <dfischer at usol.com>
To: <vintage-audio at mailman.qth.net>
Sent: Monday, June 14, 2004 4:30 PM
Subject: [Vintage-Audio] Re IHF Rating System


>
>
> Hi All,
>
> Once upon a time, there was a power rating system known as
the Institute of High
> Fidelity, or IHF. This was at a time when manufacturers
tried to suck in the
> public with 'peak' power ratings. "Handles 200 watts!" Yea,
but for 250
> milliseconds before the amplifier exploded! Shortly
thereafter the IHF rating
> appeard, I think? Then we went to the continuous RMS scale,
which was more
> accurate, or so they made us think anyhow.
>
> Does anyone recall what the IHF rating was actually based
upon?
>
> Thanks.
>
> Duane W8DBF
>
>
>
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