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- Newsgroups: rec.audio
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!munnari.oz.au!titan!titan!tpearson
- From: tpearson@titan.trl.OZ.AU (Trevor Pearson)
- Subject: Re: The Bose flame war: Equalizer Bunk
- Message-ID: <1993Jan27.012250.9338@trl.oz.au>
- Sender: root@trl.oz.au (System PRIVILEGED Account)
- Organization: Telecom Research Labs, Melbourne, Australia
- References: <C1A7B3.469@world.std.com>
- Date: Wed, 27 Jan 1993 01:22:50 GMT
- Lines: 34
-
- DPierce@world.std.com (Richard D Pierce) writes:
- > In article <93022.112357MHUGHES@MIAMIU.BITNET> <MHUGHES@MIAMIU.BITNET> writes:
- > >
- > >The mere fact that 901s are sold with an equilizer is testament to their
- > >poor design.
- >
- > This is so much nonsense. Using active equalization is a perfectly valid
- > engineering methodology to achieve a particular response. For example, one
- > very nice design is to design a sealed box system with a Qtc of 0.5
- > (seriously overdamped) then use a two-pole active high pass filter with a
- > cutoff the same as the system resonance with a relatively high Q. The
- > result is a 4th order system with high efficiency, relatively small
- > cabinet and flat frequency response.
- >
- > Having defended the technique of active equalization, PLEASE don't think I
- > am condoning Bose's obvious abuse of the technique. You can't get
- > reasonable linear bass out of a system well below resonance. The technique
- > I outlined above results in about a 6 dB maximum boost in the EQ at
- > resonance, then a rolloff below that. The Bose EQ has a boost (as I can
- > recall) of almost 24 dB well below resonance. The inevitable, physically
- > unavoidable result is nothing more than LOTS of distortion. Period.
- >
- > On the same token, don't take Bose's abuse as evidence to heap wholesale
- > condemnation on an otherwise valuable technique.
- > --
-
- Gee Dick, you are totally correct BUT, a sealed system is described as
- high efficiency? As I'm sure you'd agree, equalization does not increase
- the efficiency of a system. I usually retain the term high efficiency
- for Horn loaded speakers, when describing speaker systems. I will
- admit the term is relative and used very loosely these
- days.
-
-
-