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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>
  97
  98
  99
 100
 101     <div id="sidebar">
 102
 103
 104
 105 <h2>Archive</h2>
 106 <ul>
 107
 108 <li>2021
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 119 <li>2020
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 166
 167 <li>2018
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 181
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 183
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 185
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 187
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 189
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 191
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 193
 194 <li>2017
 195 <ul>
 196
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 208
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 210
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 212
 213 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 214
 215 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 216
 217 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 218
 219 </ul></li>
 220
 221 <li>2016
 222 <ul>
 223
 224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
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 237
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 239
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 241
 242 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 243
 244 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 245
 246 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 247
 248 </ul></li>
 249
 250 <li>2015
 251 <ul>
 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
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 264
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 266
 267 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 268
 269 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 270
 271 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 272
 273 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 274
 275 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 276
 277 </ul></li>
 278
 279 <li>2014
 280 <ul>
 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 285
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 291
 292 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 293
 294 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 297
 298 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 299
 300 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 303
 304 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 305
 306 </ul></li>
 307
 308 <li>2013
 309 <ul>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 312
 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 316
 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 318
 319 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 320
 321 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 322
 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 326
 327 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 334
 335 </ul></li>
 336
 337 <li>2012
 338 <ul>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 347
 348 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 349
 350 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 351
 352 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 355
 356 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 363
 364 </ul></li>
 365
 366 <li>2011
 367 <ul>
 368
 369 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 370
 371 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 372
 373 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 374
 375 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 376
 377 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 378
 379 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 380
 381 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 382
 383 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 384
 385 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 392
 393 </ul></li>
 394
 395 <li>2010
 396 <ul>
 397
 398 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 399
 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 401
 402 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 403
 404 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 405
 406 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 407
 408 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 409
 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 413
 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 415
 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 417
 418 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 421
 422 </ul></li>
 423
 424 <li>2009
 425 <ul>
 426
 427 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 428
 429 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 430
 431 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 432
 433 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 434
 435 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 436
 437 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 438
 439 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 440
 441 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 442
 443 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 444
 445 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 446
 447 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 448
 449 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 450
 451 </ul></li>
 452
 453 <li>2008
 454 <ul>
 455
 456 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 457
 458 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 459
 460 </ul></li>
 461
 462 </ul>
 463
 464
 465
 466 <h2>Tags</h2>
 467 <ul>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 478
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 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
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 558
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 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
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 566
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 571  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 572
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 582
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 588
 589  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (19)</a></li>
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 592
 593  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 594
 595  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 596
 597 </ul>
 598
 599
 600     </div>
 601     <p style="text-align: right">
 602  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 603 </p>
 604
 605   </body>
 606 </html>