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Misc. driver distortion measurements

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  • Misc. driver distortion measurements

    Here are some (poorly done) REW/jbox distortion measurements that
    I did this morning to help me decide on some driver and crossover ideas.
    I'm still a newbie at this...

    hardware: jbox where supplied electret microphone was approx 1 meter away.
    snell k cabinet used though some drivers didn't quite fit...

    First up 8" woofers

    dayton dsa215-8 8" designer series aluminum cone
    Click image for larger version

Name:	dsa215-distortion.png
Views:	146
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ID:	929226


    dayton da215-8 8" aluminum cone
    Click image for larger version

Name:	da215-distorition.png
Views:	129
Size:	158.2 KB
ID:	929227


    dayton rss210hf-4 aluminum cone
    Click image for larger version

Name:	rs210hf-4-distortion.png
Views:	128
Size:	162.3 KB
ID:	929228



    10" dayton dsa270-8 designer series aluminum cone sticking out an inch or two from 8" woofer hole.
    Click image for larger version

Name:	dsa270-dist.png
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ID:	929229



    5" dayton dsa135-8 designer series aluminum cone, not quite fitting into a smaller type M cabinet on top of type k box
    Click image for larger version

Name:	dsa135-dist.png
Views:	129
Size:	150.5 KB
ID:	929230

    next up assorted tweeters for a 2-way

    seas 19tff1 3/4"
    Click image for larger version

Name:	19tffc-dist.png
Views:	132
Size:	151.8 KB
ID:	929231


    peerless d19td05 3/4" (purchased recently through parts-express.com)
    Click image for larger version

Name:	d19-new-dist.png
Views:	133
Size:	148.7 KB
ID:	929232

    sb acoustics sb19st-c000-4 3/4"
    Click image for larger version

Name:	sb19-dist.png
Views:	133
Size:	153.7 KB
ID:	929233

    sb acoustics sb26st-c000-5 1"
    Click image for larger version

Name:	sb26st-dist.png
Views:	134
Size:	155.9 KB
ID:	929234

    peerless bc25tg15-04 1"
    Click image for larger version

Name:	bc25-dist.png
Views:	128
Size:	148.8 KB
ID:	929235

    dayton dc28f fabric dome
    Click image for larger version

Name:	dc28f-dist.png
Views:	128
Size:	155.7 KB
ID:	929236

    dayton old rs28a aluminum dome
    Click image for larger version

Name:	rs28a-dist.png
Views:	134
Size:	159.5 KB
ID:	929237





  • #2
    Mods you can move this.
    I didn't realize there was a driver testing sub category

    Comment


    • #3
      Started project to rebuild a snell type m cabinet with current drivers, and crossover parts.
      An initial Type M redesign. Snell Type M cabinet is 7.5-in wide 11-in tall 5.5-in deep.
      driver rebates need rework to fit new new drivers.
      dayton designer series 5" aluminum cone woofer
      sb acoustics SB19ST tweeter

      Click image for larger version  Name:	type-m-redesign.png Views:	0 Size:	199.0 KB ID:	929617 2-way crossover in the style of Peter Snell's original type k, e, etc. speakers.
      12dB/octave electrical around 2500Hz. Low parts count. (no zobels, etc.)
      Woofer crossover has some baffle step compensation. (the slope between 200Hz and 1000Hz)
      Recommended parts: solen 16ga air core inductors, clarity cap pur caps, mundorf m-resist 20W resistor.
      Attached Files

      Comment


      • #4
        Snell K bookshelf speaker rebuild with the inexpensive Dayton DA215 aluminum cone woofer and seas 19tffc 3/4" tweeter.
        I prefer the seas 3/4" here to the current peerless D19. worth the upgrade cost here replacing aged and slightly defective tweeters.
        Using original inductors. Replace electrolytic cap stacks with Jantzen Z-standard 10uF.
        The relatively inexpensive Jantzen Z-standard caps works extremely well here.
        A preferred balance of sonic characteristics with these drivers, and convenient size, standard solid core leads, etc.
        Change out adjustable resistor in tweeter circuit to Mundorf MResist 20W fixed 8.2ohm wired after inductor.‚ÄčClick image for larger version

Name:	snell-k-da215-seas19tff.png
Views:	9
Size:	185.3 KB
ID:	930344

        Comment

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