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  1. Loop delay error

    REW Forum
    Hi, I have made a lot of measurement and have been struggling to properly measure the delay between Right and Left subs. Since I have a Behringer UMC22 soundcard Dayton mic I have the option to both run Acoustic reference and Loopback reference. I use a minidsp 2x4 balanced between a Marantz...
  2. Issue with timing reference loop back and XMC-1 sub time alignment

    REW Forum
    I've been trying to use a timing reference, but keep getting a frequency response plot that looks altered. I initially had lots more interference until I disconnected my amp from the XLR connection, but after figuring that part out, the freq plot looks decent, but is skewed only when using a...
  3. Ground loop isolator

    System Setup and Connection
    So I picked up one of these, and installed it. Can anyone figure out why it made my 60hz hum louder? Like 10db louder. Could the ends be installed on the wrong side? Sent from my iPhone using Tapatalk
  4. Ground loop??

    REW Forum
    Hi again! Prior to start my measurements I've seen this looking at RTA in silence. As you can see there's a peak around 50Hz and I'm in Spain so I guess it's a ground loop causing some kind of hum noise. Will this affect the measurements at all?? Should I try to solve it someway before going on...
  5. Tascam US-366 and Loop Back

    REW Forum
    Hey All, This is a new guy kind of question. The Dayton mic I am buying and all mic's I guess need phantom power? Correct? If I am doing a measurement that requires Loop Back Timing can I use the XLR connection? I think NO. Or I believe the correct way would 1/4" balanced or unbalanced from the...
  6. Dayton UMM-6, ground loop hum?

    REW Forum
    Hi I've just got the Dayton Audio UMM-6 microphone and got the REW installed on the laptop. My issue is that when I connect the laptop to the Receiver (Denon X4000) through Aux, there is an audible hum. Increase in volume makes it louder. Ive tried connecting my phone through the same cable...
  7. Loop gain measurement with REW?

    REW Forum
    I know what I am trying to do is out of the scope of the REW program, but maybe it can be done. What a im trying to do is to measure the stability(gain margin and phase margin) of a control loop like in the picture below. To do this I need a swept generator and two measurement channels. I...
  8. Mbox Calibration Loop?

    REW Forum
    I have an Mbox (black version, a couple years old) and am stuck in the first step of REW. I am trying the loop calibration so I have unplugged my TRS connections, aside from one going from the left monitor output into one of the two "line in" inserts (both on my Mbox). When I do the REW...
  9. Another Ground Loop Thread..Please Help

    System Setup and Connection
    Ok here's the situation. Getting hum through all my speakers. I troubleshooted and it's the hdmi cables coming from htpc, oppo and projector because they have a ground on the power plugs. The xbox and roku are fine, no ground. If I disconnect the plug from the oppo for example and leave...
  10. UMM-6 or UMIK-1 and lack of timing loop?

    SPL Meters | Mic's | Calibration | Sound Cards
    For REW/home theater measuring by a non-pro, are there any differences between these mics? Does the lack of timing loop compromise the usability of a USB mic over a USB preamp and balanced mic, or is there a workaround that moots it? Thanks, Jeff
  11. System Delay Using Loop Back Connection

    REW Forum
    Hi, I am trying to set the digital delay (FBQ100) to my near field sub which is about 0.8 meter away. This is to try and time align this sub with another sub located front left, about 3 meters away.These two subs are connected to the AM8033C (which is set to Bypass for the purpose of this...
  12. Cable TV ground loop noise

    System Setup and Connection
    Hi all, I decided to hook up my cable box to my AVR to watch the UFC PPV. But doing so added noise to the entire system. I know it's caused by my cable provider (RG6 wire). The two solutions I know about are to remove a ground tab from the cable box or the AVR units power cables or to use an...
  13. Feedback Loop Delay Compensation

    REW Forum
    Is there a limit to the amount of delay compensation that the software can or will apply through the feed back loop?
  14. M-Audio Fasttrack Ultra - Soundcard Calibrate (Loop) Problem

    REW Forum
    Hi everyone. There is a problem about the looping for Soundcard Calibration with Fasttrack Ultra. In the Preferences window, I tried every combination of selections but I couldn't make Fasttrack Ultra's right output to Fasttrack Ultra's Line in 1 for calibrating. I can not choose input device...
  15. Calibrate mixer in the loop?

    SPL Meters | Mic's | Calibration | Sound Cards
    Planning to buy: UCA202 Xenyx 502 EMM-6 I read that the mixer should be in the loop when calibrating the sound card. Question is, how do I do the loop? #1 or #2 I would think its #1... Also, what is a cheap mic stand for measuring?
  16. Closed Loop Video Calibration

    Video Calibration
    November 7, 2011 What is it? Closed loop calibration (aka Auto-Cal™ (AC)) is an autonomous method of display color calibration using measurement and test equipment to match a selected standard. The standard the display is adjusted to is a choice made by the user typically based on the source...
  17. Hearing Aid Loop causing problem with our PA.

    Pro Audio
    Hi, We put our reliable PA set-up (used many times in various venues without issue) into a town hall here in the UK and all we kept getting was feedback on pretty much everything we plugged in. Even when turning off the mixer and amps we got feedback from guitar amps even when just a solo...
  18. Cable ground loop HELP.

    General Service and Technical Information
    Ok, I had a very bad ground loop hum on my cable that I just had installed in my HT room. After doing some reading here at the Shack I discovered the cable guy left the ground wire off the new splitter. I reconnected it and 80% of the hum is gone. So the question is how do I get the last little...
  19. Fix for ground loop issues

    DIY Subwoofers - General Discussion
    I posted this in the diy subwoofer section, because I first began having trouble with ground loops after my pro amp/sub installation. For anyone out there who has ground loops associated with their cable or satellite, I have found an easy fix that I haven't seen posted elsewhere. The system...
  20. Connect FBQ2496 in tape loop?

    Electronic Processing/Equalization Devices
    I hope anyone can advise me. Sorry for clumsy use of language, but English is not my first language. My system consists of: Source Modwright Transporter streaming flac/wav/high res.files over ethernet gigabit network from music server. Amplifier integrated Musical Fidelity KW550. Speakers one...