Horn Loudspeaker

21st December 2003

Basic Study - Part 3 - Frequency Response

The compression driver's alone frequency response. Since there are a pair, one of left and the other for right. Therefore the 2nd one will also be studied under close scrutiny.

Both are very different.........this is very sad.......

The compression driver are from Altec Lansing. They are old, bought around 1996 2nd hand with the voice coil replaced new.

The difference will cause the cross-over point to be different, their sensitivity is slightly different, the tonal quality is completely different. 

Little can be said about their actual sound quality, the interpretation of results of such graphs are still limited to humans, especially in the horn case. To be elaborated later.

Below shows 8 speakers approximately 15 years old, 7" all repaired by re-glue the surround and dust cap. Still highly consistent, most of them. They are Polk Audio's LS90 from the 1990s.

The two compression driver above, is extremely far off in the audio perfectionist world.


  1. Horn Loudspeaker
  2. Compression Driver
  3. Frequency Response
  4. Reverse Rubber Process
  5. Reverse Rubber Results
  6. Double Rubber
  7. Tape Mouth
  8. EQ
  9. Horn On
  10. Consistency
  11. Actual Output Locations
  12. Actual Output Results
  13. Different Horn Shape
  14. Different Horn Shape Results
  15. Phase Plug



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