1st attempt at REW

**cburbs** · **04-30-07, 11:11 PM**

So I have a chaintech av710 - and this is some of my first info -

1st pic is Souncard settings, then Soundcard Calibration , and then check that the calibration has been successful.

Sample rate: 48000Hz
-3dB points: 7.3Hz, 20.612kHz
Input device: Envy24 Family Audio (WDM)
Input: LINE_IN (Line In)
Channel: Right
Input volume: 0.133
Input RMS target: -12.0dB
Actual RMS at 1kHz: -11.9dB
Output device: Envy24 Family Audio (WDM)
Output: SPEAKER
Sweep level: -12.0dB
20Hz .. 20kHz flatness: +0.1, -0.7dB
1kHz 2nd harmonic: 0.001%
1kHz 3rd harmonic: <0.001%

**brucek** · **05-01-07, 03:21 AM**

Is there a question?

**cburbs** · **05-01-07, 07:07 AM**

These graphs are correct for the 1st part right?

**Otto** · **05-01-07, 09:09 AM**

Yep, looks good for a soundcard cal.

**cburbs** · **05-06-07, 10:26 PM**

1st graph is amp filter at 20low
2nd graph is amp filter at 20med
3rd grapsh is amp filter at 20high

**cburbs** · **05-06-07, 10:32 PM**

Now going thru some more stuff I think I goofed...Do I have the correct settings in the following two files. For the soundcard do I need teh test.cal in there from when I calibrated it?
Do I need to use the radioshack cal file for the mic/meter?
I am hooked up to my preamp with speakers off as of now?

**brucek** · **05-07-07, 08:34 AM**

Quote:

For the soundcard do I need teh test.cal in there from when I calibrated it?

Yes.

Quote:

Do I need to use the radioshack cal file for the mic/meter?

Yes.

You don't need to re-measure to load the cal files and apply them to the measurement. If you saved the mdat file of the measure, it contains the impulse response that is used to derive the frequency response.

Simply load the mdat file and the cal files, then click the IR Windows icon and press Apply Windows and the new frequency response will be calculated for the measurement that is selected.

We normally post our graphs with a vertical scale of 45dB to 105dB and a horizontal scale in your case of 10Hz to 200Hz.

Turn off the C-Weight switch since you'll be using the cal file instead..

brucek

**cburbs** · **05-13-07, 09:09 PM**

Ok so what is the best thing to change if you keep get input clipping detected?

The volume on the receiver or the Level DB fs?

I have an amp that has multiple dampening settings so I want graphs for all settings.

Example for graph below: Receiver volume at 39, crossover 80, sub -5. Amp has crossover maxed - no off option, phase at 0 and volume 1 oclock and setting at 14, Low dampening.Though I had to keep decreasing the sweep level which brings the spl down.

Here is the graph -

**brucek** · **05-13-07, 10:03 PM**

Change the graph to Logarithmic from Linear. (Freq Axis) icon in upper right corner of REW.

Set the Receiver so the level using the RS Meter is 75dB and then set the input level so it doesn't clip..

brucek

**cburbs** · **05-13-07, 10:32 PM**

Will make some more attempts tomorrow night...thanks.

**cburbs** · **05-17-07, 08:14 PM**

Here is one graph that finally worked out - any thoughts....

**brucek** · **05-17-07, 10:06 PM**

You need some equalization, but overall it's not too bad................

brucek

**cburbs** · **05-20-07, 09:24 PM**

Attatching Graphs - All grapsh are receiver with a 80xo.
Without adding a BFD which graph seems to be the best overall?
Should I run any sweeps at 60xo, 70xo, or 90xo?

1st one is with amp 14 - Low dampening, 14- Med, and then 14- H.

**cburbs** · **05-20-07, 09:58 PM**

2nd set is 20-L, 20-M, and 20-H

**cburbs** · **05-20-07, 09:59 PM**

3rd set is 28-L, 28-M, and 28-H.

**brucek** · **05-20-07, 11:00 PM**

When comparing graphs, use the ALL MEASURED tab in REW. It overlays all your measurements onto a single graph. It makes comparisons much easier.

"amp 14 - Low dampening, 14- Med, and then 14- H.
2nd set is 20-L, 20-M, and 20-H
3rd set is 28-L, 28-M, and 28-H."

Gotta be honest, I don't have a clue what this means?

brucek

**cburbs** · **05-21-07, 07:01 AM**

I have the A350-Basic Rythmik amp that has different damping control settings - per the site.

A defeatable extension filter with separate frequency and damping control. The extension filter can be bypass with 14 Hz and high damping setting. Frequency is adjustable between 14, 20 and 28 Hz. Damping factor is adjustable between high damping (Q=0.6, or bessel filter), medium damping (Q=1.07, or 1.5 dB boost Chebyshev), low damping (Q=1.33, or 3 dB boost Chebyshev). There are a total of 9 settings available. You can use this filter to boost the bottom end or do minor correction for room response.

**05-21-07, 10:08 AM**

14Low looks a better starting point, more level and dips aren't as deep. But then I've only just blown the dust of my DEQ and started playing with this stuff again a week ago.

**cburbs** · **05-21-07, 10:34 AM**

Yes 14-L is what I was thinking is the best so far.

**cburbs** · **05-21-07, 09:55 PM**

all 3 14 damp settings

**cburbs** · **05-21-07, 10:01 PM**

3 20hz amp settings....

**cburbs** · **05-21-07, 10:04 PM**

3 - 28hz amp settings.

**cburbs** · **07-07-07, 01:34 PM**

OK I have been playing with RDES and my subs. I have onlyplayed around with it a little. I can't seem to get rid of that 22hz peak.

Can't really move my subs so I don't know what to do with that. Red is no EQ and purple is EQ it a couple rounds and coming up with that.

Since RDES has 5 filters now will they add one since REQW only has 4 for it right now?

**cburbs** · **07-07-07, 01:39 PM**

Graphs alone....

**brucek** · **07-07-07, 02:40 PM**

Quote:

Since RDES has 5 filters now will they add one since REQW only has 4 for it right now?

Again I'm a bit lost.

What is RDES?

What does it mean that REW only has 4 for it?

brucek

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