Hi Kevin,

I had a similar problem with my laptop and SB USB MP3+. It seemed the computer's AC signal was somehow leaking into the audio out on the SB.

Disconnecting the AC and running solely on the battery while doing measurements solved the problem.

Hope this helps. :)

--Wayne

Thanks Wayne, I read that before but I forgot about that :D

That would explain why I was still hearing the heartbeat sound after closing the REW, closing all programs on my laptop then disconnecting and reconnecting the MP3+ from and to the laptop

Hi John,

Since I have not heard back from Behringer, I contacted Sound On Sound magazine in the UK yesterday, with a request to help get you a real live DEQ2496 to assist you in adding that capability to REW.

They did respond to let me know the message was received (a real person, not an auto-response), so let's see what happens ...

BTW, I am somewhat flabbergasted that out of the 10 frequenters of this forum who asked you to include capability for the Behringer Ultracurve Pro, not one has chimed in with an offer or suggestion as to how to get a unit to you.

Like the yin without the yang, "take" doesn't work without the "give". That's why it's called "give and take". Go figure! :rolleyes:

Cheers all, :)

--Wayne

Ok, I finally got the REW up and running last night, nice program once it is all set up. After running my sweeps I only have one peak that needs to be adjusted at 31.5Hz, this is going between 30Hz (where my current sub drops off at) and 80Hz.

I will be getting a new sub in about a month but I am curious, how do I actually setup a house curve? I thought that there were some settings that were pre-loaded in the program, but I see that I have to do it manually.

John -
Looks like an excellent program but I would hate to pull out the old PC. Cut that cord and went all Mac. Equipment of choice would be a G4 iBook with Powerwave from Griffin, also have an iMac G5 available. Any progress on working out the Mac bugs? Currently everything loads and even outputs, can't seem to find a trick to make it recognize inputs.
Thanks for all your efforts,
Joel

Work on the Mac issues is in progress, but it will be a while before there is a more mac-friendly version, probably April.

Hi John,

Since I have not heard back from Behringer, I contacted Sound On Sound magazine in the UK yesterday, with a request to help get you a real live DEQ2496 to assist you in adding that capability to REW.

They did respond to let me know the message was received (a real person, not an auto-response), so let's see what happens ...Seems like that was a good route Wayne, I've had an email from Behringer about getting a unit, watch this space... :)

Looks good on you, John. Thanks for all your diligent and brilliant work!

Will stay tuned ... :D

-- Wayne

What is needed besides your software? Is a microphone needed? Speakers for the PC? What else is needed?

Visit the link in the first post on this thread, and read the user's manual.

hi there

Have a beginner question; was going to get some mics and measure the phase of my speakers (last time visitors said they hear wrong phase and large spl differences between left and right), following this webpage :

http://www.ymec.com/hp/signal2/check02.htm

Can RoomEQ do phase measuremt from speakers ? I'll am wonder about ETA ... reason I backtrack is I already have a Radio Shack SPL meter

thanks
jeff

I am learning how to use this great tool. I run a toslink cable from my PC to the AV reciever and run my RS SPL meter from the soundcard to the living room via a 20' RCA cable. I am able to get some great measurements, but it is rather painstaking for me to adjust all speakers individually.

What I would like to do is just run my Avia sweeps and get measurements that way. Is there any way to do this? This would allow me to adjust each channel independently without physically disconnecting each speaker (except the one I am measuring) as I do with the current setup. My soundcard will not output 5.1, 6.1 or 7.1.

I apologize if this has been answered already. I did not read the entire thread.

Thank you very much.
Keith

I did find some info on posts 560 and 561. Thank you.

Whats a good calibrated microphone to use with this software? I'm currently messing around with other software, but will switch to this and give it a try. But in the end I still need a calibrated microphone to get accurate results.

You've developed a terrific product!

I've got the capability to feed my multichannel receiver directly from my PC via a Toslink/coax cable .... I go USB to an Empirical Audio USB to coax converter, which uses the MAudio Transit USB software/drivers.

Is there any way to "direct" the output of REQ to my three front and two surround speakers "independently"? Currently I have to swap out RCA cables on the back of the receiver (eg, switch the "left" output from REQ to the center channel input to measure that way.) It sure would be more convenient if there was some way to "route" the REQ output to a specific channel of a 5.1 (or even better 7.1) setup.

Figure there must be some "sound card" type functionality or plug in that would do this?

Hi Bruce,

No way to do that at the moment. Would need to generate a DD or DTS stream with the test signal in the relevant channel, but that would need a DD/DTS encoder and the encoder compression would also have a big impact on the measurement.

Whats a good calibrated microphone to use with this software? I'm currently messing around with other software, but will switch to this and give it a try. But in the end I still need a calibrated microphone to get accurate results.Buy a Behringer ECM-8000 and use the correction files included in REQW

Could someone direct me to the post or provide the info on how I use the RS SPL meter correction files? Is there one post that explains the process? I just don't understand I guess how to turn a .txt file into a .cal file.......then do I import it into REW or what?

Guys, I have a quick question:

When I load up the mic calibration file for my RS SPL meter I get a line that appears below my target line for the low frequencies and then it rises until it eventually meets up with the target line. Should my bass be following the Mic Cal line or should I be ignoring it?

Guys, I have a quick question:

When I load up the mic calibration file for my RS SPL meter I get a line that appears below my target line for the low frequencies and then it rises until it eventually meets up with the target line. Should my bass be following the Mic Cal line or should I be ignoring it?

Nice theater there. Continuing my original question, how did you "load up" the cal file?

Nice theater there. Continuing my original question, how did you "load up" the cal file?

On the same page that you download REW, you download the CAL file for your SPL meter. You then click on Meter in the Room EQ Wizard and click on load calibration file.

Thank you. The file loaded, and I see the "curve" for the meter. It's too late for me to take a measurement tonight, but am I to assume with this file loaded, all subsequent measurements will now be "corrected" somehow with this file? In other words, is there anything else I need to do other than load the file?

Thank you. The file loaded, and I see the "curve" for the meter. It's too late for me to take a measurement tonight, but am I to assume with this file loaded, all subsequent measurements will now be "corrected" somehow with this file? In other words, is there anything else I need to do other than load the file?

You see, that's what my question is. You'll notice that the 'target' line eventually evens out and the 'mic cal' line also evens out. I THINK you're supposed to take the mic cal line and slide it up until each of the two lines is level with each other. I THINK you're supposed to then use the mic cal line INSTEAD of the target line and set your filters so that your reading matches your mic cal line... I THINK :rolleyes:

Please please please.... someone... anyone... correct me if I'm wrong here because I'm not entirely sure.

The mic cal file is used by REW to apply corrections to measurements you make. You only need to load the file, you don't need it to be shown on the graphs and you don't need to make any other use of it. For detailed help on using REW read the help files :) and use the support forum at www.hometheatershack.com/forums/bfd-rew-forum

Thanks John.

The mic cal file is used by REW to apply corrections to measurements you make. You only need to load the file, you don't need it to be shown on the graphs and you don't need to make any other use of it. For detailed help on using REW read the help files :) and use the support forum at www.hometheatershack.com/forums/bfd-rew-forum

Aaaaaahhhhhhhhhhh!!!

Thanks :D

I hope someone can help me with this. Last night I was attempting to use REW to setup my subs, following the help file I calibrated my external soundcard without problem. The problems began when I attempted to set my levels, no matter what I did I couldn't get my levels to play any louder than about 64db on my spl meter. I have a Denon 987 receiver and I had it turned up to max with still no luck.

Unless I can get the levels up to 75db on my meter, the plot of my subs comes out way below the level line.

Thanks in advance

I can't access Home Theater Shack from work so I am hoping someone here can help me. I setup my bfd using REW but I am not sure if my input level is too low or high? Last night I was watching part of Flight of the Phoenix and parts of it had the red lights on my bfd maxed out. I was watching a at -8 from reference so I don't believe I had reached the limits of either my sub or amp. My subs level is currently set for -7.5, should I turn the input level from the receiver down and the sub output up to help prevent clipping?

Kevin, I think when the BFD filters are on (not in Bypass mode), the red light indicates clipping of the BFD output. Do you have filters with many dBs of boost. If so, that explains why. Generally I keep my boosts to less than 5 dB.

A little confused on the wiring-- the more common setup seems to be as posted in the attached jpeg. However, I have found a few references on the web where the
left channel of the pc output is connected to the left channel of the pc line in. I do not understand why one would want this feedback loop in place. Should it be left disconnected at all times? Tnx.

Kevin, I think when the BFD filters are on (not in Bypass mode), the red light indicates clipping of the BFD output. Do you have filters with many dBs of boost. If so, that explains why. Generally I keep my boosts to less than 5 dB.

None of my filters are set to boost any frequencies, only cut them. Since posting my question I decreased the input level about 2 db and adjusted the volume on my subs and so far I haven't had any clipping issues.

Hi everyone, I've just had a little play with REW and am impressed by its features, but it stumps me in a couple of places.

I purely want to use it to get a -3/-6db frequency response of my system at the moment with and without the subwoofer.

How do I interpret the results to show me this?

Is it the amount of db below the target level which relates to these numbers or am I way off?

Hi everyone, I've just had a little play with REW and am impressed by its features, but it stumps me in a couple of places.

I purely want to use it to get a -3/-6db frequency response of my system at the moment with and without the subwoofer.

How do I interpret the results to show me this?

Is it the amount of db below the target level which relates to these numbers or am I way off?

I recommend that you consider peaks and dips above and below the target level. Well, you would know where to get comprehensive help - where you found REW. In case you had the old version, you should consider getting the latest version.

Brucemck2,
I've been looking for the exact same feature as you do, and i guess there must be the way
to achieve that tweaking the os, but i'll be damned if i know how :(

I played a bit with graphedit, but without success, i also tried to ask on the HTPC
section, again without success :mad:

The sad part is that i strongly doubt that John will be able to insert such a feature
in future versions of REW, since DD and DTS encoding are subject to royalties, afaik.
Maybe it could obtain the same purpose (at least for me) if it could use test signals
recorded on a DVD (white noise/pink noise/MLS/Whatever).

JohnPM,
Cheers, this is Zaphod from studiotips, just thought this was a bit too HT related
for the acoustics guys there :D

My set up includes a Velodyne DD15 that came with a mike that appears to be a Behringer 8000. The mike has the XLR connector. I wish to use it as a calibrated mike with REW.

Is this a good plan?

Is there a simple adapter I can use that will match the impedance and supply the 48vdc phantom power needed to juice the mike?

John

Is there a simple adapter I can use that will match the impedance and supply the 48vdc phantom power needed to juice the mike?You'll need a mic preamp that supplies phantom power, a few people on HTS use Behringer's UB802 (http://www.hometheatershack.com/forums/bfd-rew-forum/1117-ecm8000-how-do-i-set-up.html) though I think it has been replaced by the Xenyx 802.

My set up includes a Velodyne DD15 that came with a mike that appears to be a Behringer 8000. The mike has the XLR connector. I wish to use it as a calibrated mike with REW. Well, you would have to have it calibrated. Otherwise, the exact frequency response is undefined.

Is there a simple adapter I can use that will match the impedance and supply the 48vdc phantom power needed to juice the mike? I've had good results with the M-Audio MobilePre.

So I ran Room EQ Wizard for the first time, and this is what I got on my JL F113, not very impressive to me. What are your thoughts?

So I ran Room EQ Wizard for the first time, and this is what I got on my JL F113, not very impressive to me. What are your thoughts?

In general, that's not too far off from a sub plot. Never mind the peaks- they can be EQ'd out. The crossover could be better. Try running the test signal through the pre/pro or receiver whichever you use, so that you can use the bass management of the prepro or receiver.

JL F113- Bass Traps in all 4 corners - Jl Set to Ref and Crossover at a tick past 75

What do you think, these were taking a 9 differn't spots around the room.

http://i151.photobucket.com/albums/s152/1984911Porsche/52607.jpg

The valleys at 35-42Hz are very consistent, and are not easily fixed. You might try opening some windows/doors to see if that helps to fix the destructive interference (aka cancellation).

Other valleys are dependent on speaker placement. You could fill them by the use of multiple subs. A second lesser sub that's good to 25Hz will help fill the valleys in the 26-32Hz range.


In the 55-120 Hz range, you could use another sub that can rumble to 35Hz, to fill the valleys.

Did you play with the phase at all?

OK, here's the deal.

I've used REQW before (on a computer that I no longer have) so I'm somewhat familiar with the setup/calibration/measurement process. That computer was equipped with an older version of REQW and had a SB Live Value sound card. The mic was a Rat Shack SPL meter.

Yesterday afternoon and a good chunk of the evening, I spent trying to make the newest version of REQW work on the computer I have now. This new computer has a Gigabyte P965-S3 mobo with on-board sound that uses Realtek ACL883 chipset, and I'm trying to use the same RS SPL meter I used with my old setup. REQW is the latest version 4, freshly downloaded from HTS one day ago.

The first problem is that no matter what I have done so far, I cannot get a sound card calibration to work properly. If I select the input as line-in, the system sees an incoming signal even without a loopback jumper connected.

I have looked high and low and the only thing I can find that may be some type of monitor function is a setting called "stereo mix". I've tried selecting and de-selecting this option and it seems to make no difference.

The second problem is that if I skip the soundcard cal part and go straight to the SPL meter cal and measurements, the SPL meter part seems to cal properly, but when I attempt to make a measurement, it seems like it's doing that, for lack of better terms, internal loopback thing again. The response curves generated look exactly the same each time and I believe represent the mirror image of the RS meter cal file.

I'm stumped... any thoughts on what I'm doing wrong or where I can find the magic button I'm missing?

I've spent hours scouring the settings of REQW and the Windows (XP) and Realtec properties to the point of becoming extremely frustrated; I know it's gotta be something simple. :confused: :mad:

Help, Mr. Wizard...

Dunno what fixed it for sure, but I uninstalled the Realtek drivers, loaded in the newest version (mine were two revs old), cleared all the settings from REQW, and started fresh.

Worked first time through with no hitches....

This tool seems to only correct frequency response. But sophisticated systems like TACT also do phase correction. Is that possible on a PC? Am I missing something?

I'm considering a portable solution to use REQW.

The first conclusion is the M-Audio Mobilepre and the Behringer mic.

Are their any other contenders that I should look at that offer better performance for around the same cost?

whoaru

Here is another option that you should consider. Its fairly small too.

http://www.guitarcenter.com/shop/product/buy_maudio_audio_buddy?full_sku=100387450

Also, figure into your total cost, the cost of having your mic calibrated.

I am getting clipping error when i match the input and output level at -12 dB. The soundcard is a x-fi extrememusic. And I have to increase the output volume to 0.75 for that. Wave and input volumes are at 1.00.

What does that mean?

Thank you.

Sorry all,I figured it out, quite obvious from the response curve that I had boost on. I found them under advanced settings and brought them back to normal.

Ironic with a nickname like this, I missed out on the treble and bass boost :-)

if i am using the radioshack spl meter should i have it in max mode or the normal mode?

Normal mode, c weighting, slow

I have a problem configuring REW 4.00 for my input source. Configuration:

Windows Vista Business, 32-bit
TurtleBeach Audio Advantage SRM, USB audio device
Radio Shack digital meter
Dell D830 Laptop

I successfully configured REW to play audio through my receiver. However, configuring the input is not working for me.

In the TurtleBeach control panel, I selected the Line In and when I turn the RS meter on, the bar graph in Turtle Beach dances around in sync with external stimulus. In addition, through the main speakers I can hear the line-in input and I get feedback if the volume is up too high on my receiver. So I know the sound card is getting input from the RS meter.

In REW I've selected every "input device and input' option available. However, the Input meter inside REW never shows any activity, even though the input levels in the Turtle control panel applet show activity.

How can I make REW get the line-in input signal? I'm a very technical user, so I don't think it's just something dumb I'm doing. Since Turtle sees the audio levels, I'm confident I have the wiring setup correctly.

Can anyone offer some input? Without this working I'm obviously dead in the water.

Thanks!

Hello:

While I love AVS, HomeTheatherShack seems to have the REW-philes more so then here.

Check out their REW forum. You may find someone there with the same setup.

http://www.hometheatershack.com/forums/rew-forum/

Splotto

I have a problem configuring REW 4.00 for my input source. Configuration:

Windows Vista Business, 32-bit
TurtleBeach Audio Advantage SRM, USB audio device
Radio Shack digital meter
Dell D830 Laptop

I successfully configured REW to play audio through my receiver. However, configuring the input is not working for me.

In the TurtleBeach control panel, I selected the Line In and when I turn the RS meter on, the bar graph in Turtle Beach dances around in sync with external stimulus. In addition, through the main speakers I can hear the line-in input and I get feedback if the volume is up too high on my receiver. So I know the sound card is getting input from the RS meter.

In REW I've selected every "input device and input' option available. However, the Input meter inside REW never shows any activity, even though the input levels in the Turtle control panel applet show activity.

How can I make REW get the line-in input signal? I'm a very technical user, so I don't think it's just something dumb I'm doing. Since Turtle sees the audio levels, I'm confident I have the wiring setup correctly.

Can anyone offer some input? Without this working I'm obviously dead in the water.

Thanks!

The biggest issue that users have been having is due to Vista. Apparently Vista handles sound differently than Xp. Make sure you have the latest Vista compatible drivers for your sound card. Be sure to post on hometheatershack as there have been a number of users who have had problems with Vista. Me being one of them.

I do have the Target volume set slightly higher, however, I dont think that would matter. Currently I have some "wonky" issues between 15-40hz. My question is, would the location have a lot to do with this? Currently my Apartment isn't in the best of shape, old wood floors, plaster walls, and a fire escape support are factors that, I think, are contributing to this.

But, I thought I would get some opinions on what they thought about my current graph and possible solutions to correcting it.

REW Sweep (http://www.hometheatershack.com/forums/attachment.php?attachmentid=6332&stc=1&d=1203625585)

I was wondering if someone can help me with a question I asked in a different thread?

See the attachment (http://www.avsforum.com/avs-vb/showpost.php?p=14284149&postcount=1319) for my question.

Thanks

You set REW to the reference level that you use. This could also be done by using an external test tone such as your reciever to tell REW what your reference level is set at more accuratly. It is under calibrate SPL - use external source. If you know that your subwoofer is setup correctly already and just want to measure, use the identical SPL level.

Thanks Steve, that is what I did.

How do I determine if the integrated sound card in my laptop is sufficient for taking basic speaker/sub measurements? Laptop is equipped with line in and headphone/line out ports. Plan to use with Radio Shack analog SPL and Proc combo. No EQ.. just need to take basic measurements.

Vista, at the OS level, has a substantially-improved volume control that uses sophisticated techniques to ensure good fidelity. My understanding is that Windows 7 uses something similar, if not better.

I can't get this thing to work and I think it is my sound card. What sound card should I use that is very inexpensive? The one I have as far as I can tell (I am about useless when it comes to computer stuff) is a Soundmax digital audio.

Thanks
Moto

I can't get this thing to work and I think it is my sound card. What sound card should I use that is very inexpensive? The one I have as far as I can tell (I am about useless when it comes to computer stuff) is a Soundmax digital audio.

Thanks
Moto

is that "n board" audio? does it have line in/out? i use soundblastrer live external