low input

**bobmills** · **05-16-07, 06:40 PM**

I'm using a soundblaster live! ,A Radio Shack 33-2055,FBQ2496. Iv'e changed leads,jacks,added new battery to my SPL,deleted REW settings and started over. sound card cal.no problem. read all of HTS ,reset all inputs and outputs on card and settings box. reset SPL meter and yes cal. When measuring ,the output level is always up around 10 db but the input is always around -72 db. When I go threw the measurment it always stops around 90% of the way and says your input is to low usally -72.2 dBFS The highest I've ever gotten was -67dBFS. Is this low input because of the SPL meter. HELP!!!

**brucek** · **05-16-07, 06:59 PM**

When you loop the line-out to the line-in with a cable for the soundcard calibration routine, are you able to set the levels properly (with the output and input levels matched at -12dB) ?

brucek

**bobmills** · **05-16-07, 07:18 PM**

Yes the card cal.s fine

**bobmills** · **05-16-07, 07:29 PM**

I said yes to question should have thought a little first . Ive set it at least 1o times ,it always sets low around -12db and close. If it's not right on can it do what it's doing.

**bobmills** · **05-16-07, 08:21 PM**

I made some tests for your question .With the setting set in default when I had the sweep level set at -12.0 I got an input at -10.5 .Measerment got -16.2 out ,-27.1 in.When I set the sweep to -13.0 I got -11.5 with a measurment of -18.4 out -32.7 in.When I set the device to soundblaster live /speaker soundblaster live/ mic I got with input volume set at 0.841 and sweep at -12.0 results were -12.0 out/-12.1 in then measered with -17.4 out and -35.2 in. Hope you understand all this.

**brucek** · **05-16-07, 09:24 PM**

Actually, I'm not following you...sorry

I first wanted to establish that when you remove the speakers and SPL meter from the setup and simply use a loopback cable, it establishes whether the Soundcard and computer works with REW.

If you're able to get the proper levels on a Soundcard calibrate setup, then you would check that you can measure a cable (after first setting up correct levels) and get a flat line response (using the previously created soundcard.cal file).

When setting up the Soundcard cal routine, the output and input REW VU meters should be in the Yellow at about -12dB. Are you able to accomplish these levels? Like below...

VU meters.jpg

Then while leaving the loopback cable in place (after you've finished the soundcard cal file routine), can you use the Check Levels routine and get the meters again to look like the VU picture above.
Below is my Check Levels settings to accomplish that. Can you show me yours?

Check Levels.jpg

brucek

**bobmills** · **05-16-07, 09:24 PM**

Took it out of the loop and got a -73.4 dBFS input

**bobmills** · **05-16-07, 09:48 PM**

Hi I have a screen shot do you want me to e-mail it to you or post it wich I don.t no how to do .It was in the yellow 9.1

**bobmills** · **05-16-07, 10:03 PM**

Back again YES they are -12.0 and -12.1 in the yellow.The 9.1 was the yellow readings on top of the meters

**Danny** · **05-16-07, 10:15 PM**

sounds kinda obvious but are you using the right input on your sound card

**brucek** · **05-16-07, 10:21 PM**

Quote:

Back again YES they are -12.0 and -12.1 in the yellow.The 9.1 was the yellow readings on top of the meters

Good. Is that the case for both the Soundcard calibrate routine and the Check Levels routine when you have a cable loopback hooked up?

Read this. It tells you how to post pictures and graphs etc..

brucek

**bobmills** · **05-16-07, 10:55 PM**

yes theres only two lines in -Linein and mic in and I'm using line in

**MakeFlat** · **05-16-07, 10:56 PM**

Check that you don't have any attenuating cable.

**bobmills** · **05-16-07, 11:02 PM**

Thanks for trying to help, my settings pitcure wouldn't upload ,if it's to big I have to find out how to down size it. Have work tomorrow, getting to bed BUT I'LL BE BACK. Thanks again.

**brucek** · **05-17-07, 07:07 AM**

Quote:

if it's to big I have to find out how to down size it

Load the picture into Windows Paint (under the Accessories heading of the Start/Programs button in Windows)..

If it's a bmp file, Save As a jpg picture first (because they're the best type to resize) and then pull down the Stretch/Skew command in Paint and shrink the picture by whatever percentage you want (i.e 75%) and Save.

brucek

**bobmills** · **05-18-07, 09:49 PM**

Hi brucek I'm back. I'm going to send ypu three pitcures on diffrent replies.The first the one I belive you requested, the second the graft from it and third the meaurment results I got after after hooking back up.untiscreen shot.JPG

**bobmills** · **05-18-07, 09:50 PM**

2 measurment.JPG

**bobmills** · **05-18-07, 09:52 PM**

measuerment.jpg

**bobmills** · **05-18-07, 09:54 PM**

The secound and third out of order(pitcures)

**brucek** · **05-18-07, 10:10 PM**

So I'm guessing that the picture below is the Check levels routine when you have a cable looped from line-out to line-in?

The levels are fine in that picture.

check.jpg

So, when do you get the low input level? Is it when you remove the loopback cable and plug in the meter (with a stereo adapter on the right channel) and then plug the line-out to your receiver and do a Check levels?

brucek

**bobmills** · **05-18-07, 10:24 PM**

Yes thats after I get out of the loop,hook it up like you said and run measurment

**bobmills** · **05-18-07, 10:31 PM**

I'm not runnig into a reciever I'm runnig right from my card to the FBQ2496

**bobmills** · **05-18-07, 10:34 PM**

When I say measurment I mean do the main testing of the sub sweep.

**bobmills** · **05-18-07, 10:48 PM**

When you said low level it's not with that piture you showing bars circled,thats the pitcure when I have the system loop

**bobmills** · **05-18-07, 11:03 PM**

I don't know if you got my last message so I'll say if again About hooking up right channel I'v hooked up mono, sterio different cables front back sideways if you get my point I'm seeing them in my sleep

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