Re: Help narrow down frequency response software (to calibrate equalizer)?

On Mar 19, 7:54 am, "john" <nos...@xxxxxxxxxx> wrote:
Is there a program to plot frequency response of a receiver+speakers in real
time (or within a few seconds), to allow me to tweak the equalizer?

The tools I already have:

receiver, speakers
hardware function (wave) generator
laptop computer (with sound output and mic input)
oscilloscope
measurement microphone (behringer ecm8000)
mic pre-amp mixer with analog and USB port output

Add my voice to the din saying you can't correct for the response
of the system _in the room_. The physical properties of the room
can only be corrected by physical treatment, not by electronic means.
Understanding that, what you can do is compensate for the response
of the speaker(s). The speaker is, by far, the most difficult and
expensive to get to respond flat (assuming flat is what you're after).

The problem is that the typical (undisclosed) EQ's band adjustments
are so wide that they're not very useful for correcting a speaker's
fairly narrow peaks and dips. You'll also need to make your
measurements in as nearly ideal conditions as possible such as
outdoors where there's no room reflections and resonances.

I assume the soundcard in the laptop does not have a flat response curve
(both input and output), so the software should have some way to
calibrate/compensate for this.

The sound card will likely be the flatest responding link in the
chain,
assuming use of a true line input. (the ECM8000 is not truely flat
either)

When I google for sweep spectrum analyzer software, I found lots of hits.
Please help me narrow down the choices that make the best use of the tools I
have. Obviously, free software is preferred.

Most of the programs in use by those in this group will already have
some sort of built-in spectral tool (Sound Forge, CoolEdit/Audition,
etc)
or use a DX or VST plug-in to accomplish the task. Not really free.

I'm thinking you'd like something of a stand-alone app:

"VA Visual Analyser" is free and works as good as any
stand alone app I've tried.

http://www.hitsquad.com/smm/programs/VA/

There's also RightMark Audio Analyser.

rd
.

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