Jump to content

Using REW to Find Parametric Equalizer (PEQ) settings


Chris A
 Share

Recommended Posts

10 minutes ago, Emile said:

Only unplugged mic and sound from PC

 

Jumping in here at the end so have not read all pages. Sorry if you answered this already. Is it possible you changed the volume on your PC? You are using the computer to make the sound for the sweeps, right? Any chance you upped the volume on the computer and you are making it louder that way not at the pre/amp end of things?

 

Like Chris I try to note the volume setting(s) and put them in the same position each time I sit down for a new session.

Link to comment
Share on other sites

26 minutes ago, rplace said:

Is it possible you changed the volume on your PC? You are using the computer to make the sound for the sweeps, right?

Thanks @rplace :) 

Interesting thought, but 99.9% sure I did NOT change the PC volume :)  (And ... happened twice.) Yes, sound comes from PC output to my preamp aux input.

Cheers, Emile

Link to comment
Share on other sites

18 minutes ago, Emile said:

Interesting thought, but 99.9% sure I did NOT change the PC volume

 

I've done it many times. Might depend on if you have a lap top or a tower. I use a laptop with mini-jack stuck in the computer's headphone out, that on the other end has RCA Left/Right to my preamp. Its not uncommon for me to do something with the laptop's volume and realize my next sweeps won't be where I left off.

 

Another things I've done about a zillion times and forgotten is that I've un-muted the other channel from the one I'm measuring. I'm assuming since you are using an Xillica and working with Chris (same for me on both fronts) is that you set the mic up in front of one speaker and use the Xillica to mute the other....both HF and LF. After a bit of REW/Xilica tweaking I'll unmute to give some music a listen keeping the microphone in place. If you go back to measure and forget to re-mute the non-mic channel you will get higher SPL measurements.

 

It's bee a while so this could be a faulty memory but I seem to remember every time I unplug the USB mic and headphone mini-jack for "sweep noises" REW needs to know the mic file. It also defaults the output for Left or Right or Both to what it wants not what you last had it set to. So if you have the output set to left and are measuring the left speaker and it goes back to Left + Right AND you don't have the right muted you might have a problem. Again that is from memory but I seem to recall that the output was always got-cha problem for me. Check the Left/Right/Both setting and see if it has changed.

  • Like 1
Link to comment
Share on other sites

Since I haven't seen how you are connecting to your setup via your computer (output and input), I have to ask...

 

Are you using an analog output from your computer (like a soundcard) or are you using USB or HDMI?

 

If digital, what output driver are you using from your computer (ASIO, Java, etc.)?

 

Are you using a UMIK-1?

  • Like 1
Link to comment
Share on other sites

7 minutes ago, Chris A said:

Since I haven't seen how you are connecting to your setup via your computer (output and input), I have to ask...

IBM Thinkpad, headphone out mini-jack with RCA splitter goes to preamp aux in. PC output is the standard Realtek High Definition Audio which I (think) is just analog.

 

Yes; using a UMIK-1. Haha, now set up as per your instructions :) 

 

Thanks, Emile

Link to comment
Share on other sites

Oh boy....analog out...🤢

 

Can you connect via a USB to a DAC?

 

Chris

  • Thanks 1
Link to comment
Share on other sites

34 minutes ago, rplace said:

I've done it many times. Might depend on if you have a lap top or a tower. I use a laptop with mini-jack stuck in the computer's headphone out, that on the other end has RCA Left/Right to my preamp.

Haha ... identical setup. :) 

Preamp goes to Yamaha M-45 amp (120wpc) which drives the JBL horns. Preamp also goes to Kenwood Basic M2A (220wpc) that drive CF-3's.

 

In REW I set the "make a measurement" to LEFT. Haha, have not gotten to RT yet :) 

 

Thanks, Emile

Link to comment
Share on other sites

1 hour ago, Chris A said:

Oh boy....analog out...🤢

Can you connect via a USB to a DAC?

OK; "old school." :)  Do not have an external DAC, but (think) I could connect to my Oppo BDP-83SE. Might need some help with that :( but not sure why we want to go analog to digital to analog.

Link to comment
Share on other sites

Do you have an HDMI out from your computer?  That is the preferred method if using an Oppo player.

Link to comment
Share on other sites

17 hours ago, Chris A said:

Do you have an HDMI out from your computer?  That is the preferred method if using an Oppo player.

Yes; do have (mini) HDMI out from laptop and should have a mini to standard connector (haha; "somewhere").. Unfortunately my Oppo (model BDP-83SE) does NOT have an HDMI "IN," only "OUT." :(  Add-on; checked my Oppo BVD-103 and that one DOES have HDMI "in," but really do not feel like switching the units (as they are in enclosed cabinets - taking hours to get in/out).

 Think my dumb problem is due to a "default to standard setup" when I unplug the mic/audio. Will just keep everything "on" and "plugged in" between my initial measurements and subsequent "after" check - and document all settings :( Then I'll unplug and run another test to see if there were any changes. Hope to try it later today.

Many thanks, Emile

 

Link to comment
Share on other sites

I had nothing but problems using analog output from a PC using REW more than a decade ago (version 4.11), i.e., analog output from a sound card.  It actually delayed my use of REW 5-6 years until I got an AVP that had HDMI input (my first AVP only had DVI video inputs and S/PDIF audio inputs).  Once I made the shift to HDMI input from a laptop via HDMI output, all those problems ceased--problems like you're having now.

 

I have to say that some sort of digital output to a DAC, player, or AVP/AVR is highly recommended, even if you have to buy a DAC. DACs with USB inputs can be had for not a lot of money (there are good ones  available at less than $150 USD), and will likely improve your sound quality a little bit if you buy a better quality one.  I'd recommend taking a look at Topping in their lower price ranges if the price is within your budget.  The figure below from Audio Science Review: any DAC not in the "red" group is probably good enough. I've found that it's just not worth the headaches to mess with a PC soundcard.

 

best-usb-dac-png.111627

 

Chris

  • Thanks 1
Link to comment
Share on other sites

2 hours ago, Chris A said:

I had nothing but problems using analog output from a PC using REW

How to switch PC analog audio to USB audio on a laptop?

 

@Chris A Haha, glad I am not the only one :) Yes, looks like some of those Topping ones might work. (And at about $100-150 who cares :) ). But they are all USB input types. Looked at switching my (older) laptop (Lenovo T450) from analog to USB audio out and have not found a way to do it yet. Worked with PC's for about a hundred years, but never with their audio sections. Maybe the PC is too old? (Have newer ones but of course "everything audio" is loaded on my old laptop.)

 

There are also some cheap Chinese HDMI to analog converters on fleaBay ... but guess they are junk.

 

Thanks, Emile

 

Add-on; Looks like most devices are plug and play, maybe needing an additional driver. Never had any USB audio on my laptop, so there never was a dropdown option for it :) 

Link to comment
Share on other sites

27 minutes ago, Emile said:

How to switch PC analog audio to USB audio on a laptop?

 

In the preferences menu, when you connect an external digital device that can handle audio, it shows up in the "Output Device" drop-down menu:

 

image.png.5962859a9ee57dff01993a9f6e1fb195.png

 

Chris

  • Thanks 1
Link to comment
Share on other sites

2 hours ago, Chris A said:

when you connect an external digital device that can handle audio

Haha; yes finally figured out one needs a "connected device." :) 

Oops ... I was talking PC, you were talking REW :) Thanks!

Link to comment
Share on other sites

On 9/8/2021 at 11:18 AM, Chris A said:

nothing but problems using analog output from a PC using REW

OK; reran measurements keeping PC plugged in (1st pic; psycho'd). Averaged them and ran REW to find filters. Input them into my Xilica (4 filters) and results are in pic 2. No clue why I am getting 130db's in the lower freqs, certainly does NOT sound that loud :( Haha; will try another measurement AFTER my laptop was disconnected.

 

Per your recommendations, purchased a DAC. Was going to get a Topping E30, but found a Lavaudio DS600 which has bluetooth ... should be here Saturday and I'll try again :) 

 

Cheers, Emile

0909-3 initial.jpg

0909-adjusted.jpg

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...