RE: OT Adjusting Home cinema - equalizer

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

Join us Nikola...

 

... whoever dies with the most boxes, wins.

-----Original Message-----
From: Nikola Kasic [mailto:nikola@xxxxxxx]
Sent: Wed 29/05/2002 13:46
To: ukha_d@xxxxxxx
Cc:
Subject: RE: [ukha_d] OT Adjusting Home cinema - equalizer

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@xxxxxxxSubject: 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

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