Automatic Soundcard Compensation with spd/if

**xboy** · **04-01-08, 02:02 PM**

So if I want to use the automatic soundcard compensation but my output from my soundcard is spd/if (hooked up to receiver), how do I do a loop back connection?

Should I connect the left preout from my receiver to the left line in? This would take into account the delay through the system, no?

**brucek** · **04-01-08, 02:25 PM**

Quote:

So if I want to use the automatic soundcard compensation

What is the reasoning for this? REW was designed to be used with the analog line-out and line-in connections, so that you can measure and setup filters in an equalizer.

brucek

**xboy** · **04-01-08, 02:26 PM**

So the test tone is as clean as possible?

**JohnM** · **04-01-08, 02:27 PM**

You could try it, problem is you end up compensating for whatever the response of the receiver preout is which may not match the response of the other outputs - it could have a different LF roll-off. Try looping the sub output back to the right line input and make a measurement to see how flat the sub output comes out at LF, that will show you whether or not the compensation is correct.

**xboy** · **04-01-08, 02:35 PM**

What about this connection method?

I have an Audigy2, and it has both PCM digital output and analog output.

So if I loopback the analog output directly into the line-in and hook up the digital out to my AMP, my measurements should be valid?

Or is it dependent that it must use analog version from the sound card?

**brucek** · **04-01-08, 03:18 PM**

Quote:

So the test tone is as clean as possible?

I admit to not having a clue as to what you are attempting to do here?

Is your goal to use REW and a PC to measure your subwoofers response and suggest filters for an equalizer?

brucek

**xboy** · **04-01-08, 05:21 PM**

Quote:

brucek wrote:

I admit to not having a clue as to what you are attempting to do here?

Is your goal to use REW and a PC to measure your subwoofers response and suggest filters for an equalizer?

brucek

Yes, just that my PC sound card has digital output and my receiver can use that..

**brucek** · **04-01-08, 05:28 PM**

Quote:

my PC sound card has digital output and my receiver can use that

Does your soundcard not have an analog line-out and line-in?

bruce

**xboy** · **04-01-08, 05:55 PM**

Quote:

brucek wrote:

Does your soundcard not have an analog line-out and line-in?

bruce

Yeah it does, I'll guess I'll just use that and send the analog out to the amp.

Advertisement