RE: OT Adjusting Home cinema - equalizer

["Nikola Kasic" <nikola@xxxxxxx>]

No, no. No more boxes...
You wan't take me down that route :-).
Actually, my amp doesn't have classic bass and trebble buttons (as far as
I
remember). This equalizer feature is what replaces them, but with
buttons
it's much quicker, you just need to turn them, with this, I need to go
through menus...
Nik 

-----Original Message-----
From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
Sent: 29 May 2002 13:10
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] OT Adjusting Home cinema - equalizer


Nikola,

I'd be tempted to start by leaving those bass and middle settings at
0db,
and use the treble to attentuate down by a couple of decibels at the
very
top...

Then, maybe, bring up the bass by 1db at the bottom...

That's all.

Actually, I'd bypass the equaliser full stop, and whack in a
second-hand
power amp, but that's what I always do :-)

M.

-----Original Message----- 
From: Nikola Kasic [mailto:nikola@xxxxxxx] 
Sent: Wed 29/05/2002 13:00 
To: Home automation (E-mail) 
Cc: 
Subject: [ukha_d] OT Adjusting Home cinema - equalizer


I played yesterday with Sound Pressure Level meter and Test DVD
(Ultimate
DVD Platinum) and it just confirmed what I knew that my system is not
reproducing signal in mid ranges so I need to increase it with built in
equalizer. Amp is Sony STR-DB1070
However, my equalizer works in a way that I have to choose frequency
and
gain (in dB). I can choose 1 frequency in each range. Ranges are:
BASS: 99Hz - 1kHz
MID: 190Hz - 10kHz
TREBLE: 1kHz - 10kHz
Gain is distributed in bell shape (I think it's called Gauss shape, my
university days are far behind me) around chosen frequency.

I took a measurments on 3 frequencies:
1 kHz -7dB
4 kHz -2dB
8 kHz +1.5dB

Now I need to flatten frequency response curve with these
"bells", but I
forgot how to calculate the gain (formula). How far from central
frequency
it falls on 75%, 50%, 25% of the value.
E.g. if I have two 2 "bells" and in the middle of them each of
them falls to
50% of the value, resulting curve between them will be 100%. value
because
they add.

I hope this all makes sense.
Probably Mark can help me with this.

I tried with hit and miss method, but went nowhere, because those
settings
affect each other. I need to put on paper what I expect and then I can
fine
tune by measuring.

Nik