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impedance

  1. Impedance Measurement Help Needed

    REW Forum
    I'm trying to measure a pair of new Goldwood drivers I received for Christmas that I plan to use for outdoor speakers. I'm following the instructions provided online. The calibration worked just fine. I'm using a USB Soundblaster XFi soundcard switched to headphone out. I have a 100 ohm...
  2. Offset on impedance measurements

    REW Forum
    Hi, I recently made some impedance measurements on a 18" bass-reflex enclosure, with 4 successive mechanical arrangements. The following measurements were performed in exactly the same conditions. You observe that the floors of the curves are different, and by far. What could be the explanation...
  3. Cone impedance questio

    DIY Speakers
    This is a repair question. I own pair of Epos 2.5 way, 4 ohm floorstanders and recently destroyed the 2 woofers on one of them. The story would be too long so I'll spare you. Since no replacement parts are available (per the US Distributor) I had the bright idea of acquiring a used pair of the...
  4. Audio interface for impedance measurment

    REW Forum
    Hi all, A while ago I purchased a Behringer UCA202 that turned out to be fake ( eBay). I tried to use it with my DIY jig (using two 5 ohm non-inductive resistors in series) and I could not get the thing to work without noise. Eventually, I went to a friend to use his Dayton DATs to get out the...
  5. Help With Impedance Measurement Set Up Please

    REW Forum
    Hi all Hopefully you can suggest some help for me please. I'm new to REW and wish to use it for impedance measurements. I have a set up problem that I can't find any advice on how to solve this. I have a Soundblaster SBX ProStudio and Windows 10. I have set up the Soundblaster in the...
  6. Impedance Measurement

    REW Forum
    I have a 5 meter rca pair connection from a desktop to a pair of rca inputs of av receiver,the rcense is at default settings 100.0 is it o.k.?
  7. Impedance measurment: need to measure source Z

    REW Forum
    I love the ability in REW to measure the impedance of a load, but my task today is to measure the impedance of a source, the output impedance of a line-level device like a CD player or preamp. It's likely to be fairly low, but not capable of actually driving a load equivalent to it's source Z...
  8. Estimation of vented-box parameters from impedance

    REW Forum
    Hi, To accurately simulate the frequency response of a vented-box loudspeaker system, we need to know some "hard to find parameters" which are the Q losses (port, leakage and absorption losses) and the apparent volume of the enclosure (the one used to compute the box compliance). REW allows to...
  9. REW V5 impedance measurement showing large offset

    SPL Meters | Mic's | Calibration | Sound Cards
    Im completely new to measuring speakers. I wanted to measure the impedance of a speaker such that I could determine the TS parameters but the obtained results so far are not correct. To measure the impedance I have build the very simple jig with just a single 100ohm resistor. To make sure that...
  10. Impedance measurement and "Compensate for leakage losses" and "Compensate for Air Load"

    REW Forum
    Hello Everyone! First time here. When calculating the T/S parameters, REW has options to "Compensate for leakage losses" and "Compensate for Air Load”. I have read the REW help document on Thiele Small Parameters which briefly mentions the two options. However, it’s unclear as to when to use...
  11. Higher Speaker Impedance ;- Flatter power amp FR?

    Home Theater Receivers | Processors | Amps
    Hello all, I have an rmx1850hd amp and was surprised when using it to replace an old low wattage trio integrated amp that my subs did not appear to dig that low anymore but now seemed to have a stronger midbass emphasis. Although it occurred to me that this would be because I had the bass...
  12. System Impedance Matching

    System Setup and Connection
    My question is related to the compatibility of my tube preamp and my multiple amplifiers with respect to impedance matching. I have a sonic frontiers line 2 tube preamp that is fed through balanced inputs from my DAC. The pre has a balanced output impedance of 270 ohms and a single ended output...
  13. High Impedance measurement limits?

    REW Forum
    I would like to run an impedance curve on a device with nominal 4K (yes, 4000 ohm)impedance, with a 10K peak. The system was calibrated, and a measurement made, but the graph limit is maxed at 1000 ohms, so the actual curve is off the top of the graph. The measurement data appears to be valid...
  14. Impedance Measurement with REW

    REW Forum
    Hi all, What is the other pole of the speaker connected to in the diagram? http://www.roomeqwizard.com/help/help_en-GB/html/impedancemeasurement.html Can someone give a basic explanation of how this works for an idiot like me?
  15. Can I test speaker impedance with REW

    REW Forum
    Hi, I came across software called "Arta" which tests speaker impedance. I also saw something about this in the REW manual. Can REW test speaker impedance? f so, how does one go about it? Thanks, Ryan
  16. Speaker Impedance Diagram - Complex

    DIY Speakers
    I have seen several wire diagrams on the internet but I can't seem to find one to fit my specific needs. The goal is to design and build my own speaker cabinets (DIY) from sites such as: http://www.zalytron.com/ http://www.parts-express.com/ https://www.madisoundspeakerstore.com/welcome.php...
  17. Impedance measurement not working

    REW Forum
    Hi, I've been using Rew for a couple of years, so I do know the basics. I have an old laptop running XP that I use to take room and frequency measurements. I've never been able to make it take an impedance measurement though, so I've always used my desktop for this. I use a homemade jig and it's...
  18. DIY speaker project - Impedance and FR measurements, advice on hardware and process?

    REW Forum
    Hi all I would like to design and build a 2 way system based on some speakers I have obtained with no available data. I have only commenced reading on the topic however I understand I will need to obtain impedance measurements of Thiele and Small parameters to design an enclosure, then measure...
  19. Impedance Measurements - What Do I Need?

    REW Forum
    I would like to attempt some impedance measurements of my speakers, but need some guidance on what equipment specifically is required to do so. My speakers are car audio speakers, all rated at 4 ohms. My audio interface is a Behringer FCA610. I have read that a resistor is necessary, but...
  20. SVS Ultra impedance

    SVSound
    S&V rated them to be 5 ohms nominal and minimum of 3ohms. SVS rates them 8ohms. What is it? http://www.soundandvision.com/content/test-report-svs-ultra-tower-surround-speaker-system-page-3#9Dit8Ka7kTFjjYZQ.97
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