Euphony Blues


Design and Construction by Lindsey L. Johns.

Design Goals:

  1. Accurate frequency response: at least +/- 3 dB, preferably +/- 1.5 dB, low distortion
  2. Accurate bass response down to at least 60 dB
  3. Smallest possible size for shelf or desk placement
  4. Sturdy and unique-looking cabinet
  5. Budget under $600


  1. +/- 1.5 dB between 55 Hz and 18 kHz, less than 1% harmonic distortion over 50 Hz
  2. f3 of 50 Hz
  3. Dimensions: 14″ wide, 19″ tall, 14″ deep
  4. Very sturdy cabinet with custom glossy indigo finish
  5. Cost roughly $500


Dayton Audio RS225-8 8” Aluminum Reference Woofer
Dayton Audio RS28F-4 1-1/8” Silk Dome Tweeter

Testing Results:






Design Statement and Tuning Report

Full Testing Results



(Note: Some documents labeled by the previous working title, “Baby Blues”)

  1. Ash
    March 8, 2014 at 9:27 am


    I was also looking at a DIY project using RS225-8 8” and RS28F-4 1-1/8” for small active sealed neafield monitors. Few questions :
    1) How much extension will one lose if the cabinet is sealed ?
    2) What the recommended listening distance in your design ? I need 2-4ft
    3) Do you see any need for using a waveguide ?
    4) Many DIY folks recommend a much lower crossover ~1.2 khz as RS28s are smooth till 1 khz ? Any reason for higher ?


  2. Jason P Jackson
    March 5, 2018 at 1:23 am

    I’m aware of the fact that this loudspeaker has been posted aeons ago. Nevertheless, the Euphony Blues are a prime example of excellent loudspeaker design

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