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Article #1296

Re: dynamic EQ feature in what A/V receivers?

#1296
From: Arny Krueger
Date: Tue, 09 Dec 2008 22:38
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"David Grant" <REMOVE_MEjmd_2003@msn.com> wrote in message
news:14adnb0k4K8JO6PUnZ2dnUVZ_orinZ2d@giganews.com

> They have another feature called MultEq which supposedly
> corrects for room acoustics. My studies* to date have led
> me to believe that there is no decent electronic solution
> to the problem of room acoustics that has been
> discovered, and that any product which claims to be that
> solution is bogus. I'd hesitate to put much faith in a
> feature designed by the same company that touts MultEq.

The problem of what speakers sound like in a room has several aspects, some 
of which can be addressed with electronic equalization, and some of which 
cannot. The big, big issue that can't be addressed very well by electronic 
means relates to slap echoes and standing waves. Those are best addressed by 
room design and/or room treatments.

> *Frequency response varies based on location in the room.

True, but there are also overall trends.

For example, if you put a bookshelf speaker in a corner, there will be a 
build up in the bass region due to the corner's effects on the speaker. The 
room will tend to be bass-heavy all over.

If a speaker is designed for a very large room, it will be bass-heavy in a 
small room.

If a speaker is designed for reverberant rooms, it might have a dip or a 
peak in a crossover region in a dead room, or vice-versa.

Some speakers can be a little light on the bass end, but take well to 
electronic equalization.

A speaker may be voiced for use in a very dead room, and then be overly 
bright everywhere in a live room.

> If you use EQ to flatten frequency response at one point
> in a room, you make it worse in most other points,

Please see former comments about overall trends.

> and you can also add phase distortion to the signal due to
> the EQ filters.

Pretty much a "fear of the dark" issue. Phase response in most of the room 
is soup. Its so bad it can hardly be hurt.
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From: "Arny Krueger" <arnyk@hotpop.com>
Newsgroups: rec.audio.pro,alt.home-theater.misc,aus.audio-visual.home-cinema
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Subject: Re: dynamic EQ feature in what A/V receivers?
Date: Tue, 9 Dec 2008 17:38:52 -0500
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