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   6     <title>Petter Reinholdtsen: Measuring the speaker frequency response using the AUDMES free software GUI - nice free software</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Measuring the speaker frequency response using the AUDMES free software GUI - nice free software</div>
  24       <div class="date">22nd October 2018</div>
  25       <div class="body"><p><img src="http://people.skolelinux.org/pere/blog/images/2018-10-22-audmes-measure-speakers.png" align="right" width="40%"/></p>
  26
  27 <p>My current home stereo is a patchwork of various pieces I got on
  28 flee markeds over the years.  It is amazing what kind of equipment
  29 show up there.  I've been wondering for a while if it was possible to
  30 measure how well this equipment is working together, and decided to
  31 see how far I could get using free software.  After trawling the web I
  32 came across an article from DIY Audio and Video on
  33 <a href="https://www.diyaudioandvideo.com/Tutorial/SpeakerResponseTesting/">Speaker
  34 Testing and Analysis</a> describing how to test speakers, and it listing
  35 several software options, among them
  36 <a href="https://sourceforge.net/projects/audmes/">AUDio MEasurement
  37 System (AUDMES)</a>.  It is the only free software system I could find
  38 focusing on measuring speakers and audio frequency response.  In the
  39 process I also found an interesting article from NOVO on
  40 <a href="http://novo.press/understanding-speaker-specifications-and-frequency-response/">Understanding
  41 Speaker Specifications and Frequency Response</a> and an article from
  42 ecoustics on
  43 <a href="https://www.ecoustics.com/articles/understanding-speaker-frequency-response/">Understanding
  44 Speaker Frequency Response</a>, with a lot of information on what to
  45 look for and how to interpret the graphs.  Armed with this knowledge,
  46 I set out to measure the state of my speakers.</p>
  47
  48 <p>The first hurdle was that AUDMES hadn't seen a commit for 10 years
  49 and did not build with current compilers and libraries.  I got in
  50 touch with its author, who no longer was spending time on the program
  51 but gave me write access to the subversion repository on Sourceforge.
  52 The end result is that now the code build on Linux and is capable of
  53 saving and loading the collected frequency response data in CSV
  54 format.  The application is quite nice and flexible, and I was able to
  55 select the input and output audio interfaces independently.  This made
  56 it possible to use a USB mixer as the input source, while sending
  57 output via my laptop headphone connection.  I lacked the hardware and
  58 cabling to figure out a different way to get independent cabling to
  59 speakers and microphone.</p>
  60
  61 <p>Using this setup I could see how a large range of high frequencies
  62 apparently were not making it out of my speakers.  The picture show
  63 the frequency response measurement of one of the speakers.  Note the
  64 frequency lines seem to be slightly misaligned, compared to the CSV
  65 output from the program.  I can not hear several of these are high
  66 frequencies, according to measurement from
  67 <a href="http://freehearingtestsoftware.com">Free Hearing Test
  68 Software</a>, an freeware system to measure your hearing (still
  69 looking for a free software alternative), so I do not know if they are
  70 coming out out the speakers.  I thus do not quite know how to figure
  71 out if the missing frequencies is a problem with the microphone, the
  72 amplifier or the speakers, but I managed to rule out the audio card in my
  73 PC by measuring my Bose noise canceling headset using its own
  74 microphone.  This setup was able to see the high frequency tones, so
  75 the problem with my stereo had to be in the amplifier or speakers.</p>
  76
  77 <p>Anyway, to try to role out one factor I ended up picking up a new
  78 set of speakers at a flee marked, and these work a lot better than the
  79 old speakers, so I guess the microphone and amplifier is OK.  If you
  80 need to measure your own speakers, check out AUDMES.  If more people
  81 get involved, perhaps the project could become good enough to
  82 <a href="https://bugs.debian.org/910876">include in Debian</a>?  And if
  83 you know of some other free software to measure speakers and amplifier
  84 performance, please let me know.  I am aware of the freeware option
  85 <a href="https://www.roomeqwizard.com/">REW</a>, but I want something
  86 that can be developed also when the vendor looses interest.</p>
  87
  88 <p>As usual, if you use Bitcoin and want to show your support of my
  89 activities, please send Bitcoin donations to my address
  90 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
  91 </div>
  92
  93       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software</a>.</div>
  94
  95
  96     </div>
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 105 <h2>Archive</h2>
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 315
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 317
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 319
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 321
 322 <li>2011
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 348
 349 </ul></li>
 350
 351 <li>2010
 352 <ul>
 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 355
 356 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 359
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 365
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 367
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 369
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 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 377
 378 </ul></li>
 379
 380 <li>2009
 381 <ul>
 382
 383 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 384
 385 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 386
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 388
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 390
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 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 394
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 396
 397 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 406
 407 </ul></li>
 408
 409 <li>2008
 410 <ul>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 413
 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 415
 416 </ul></li>
 417
 418 </ul>
 419
 420
 421
 422 <h2>Tags</h2>
 423 <ul>
 424
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 450
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 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (21)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (12)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (14)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (305)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (195)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (37)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (73)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (63)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (15)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 552
 553 </ul>
 554
 555
 556     </div>
 557     <p style="text-align: right">
 558  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 559 </p>
 560
 561   </body>
 562 </html>