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RE: Tri-amping T IV-A's with tubes?

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InfinityApogee

In Reply to: RE: Tri-amping T IV-A's with tubes? posted by UncleMeat on January 13, 2025 at 08:48:25

How can they be different when its a 3 way system?

Follow Ups:

RE: Tri-amping T IV-A's with tubes? - UncleMeat 21:48:01 01/14/25 (3)
Technically T-IV's are 4-way speakers, reduced by a 3-way crossover. The high-pass goes to a second 2-way crossover for the ribbon/tweeter, while the low-pass goes to two bass drivers on separate panels. Those two bass drivers are 'tuned' to respond to the various frequencies in the low-pass signal, one does everything below 100Hz (or so) and the second one has 3 tuned sections that cover above 100Hz to ~5kHz.
Those bass drivers could be driven separately on single amps, doing a freq sweep would tell at what frequencies to set the crossover points/slopes at.

Edits: 01/14/25
- RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 10:10:28 01/15/25 (2)
  Here a comparsion of the two bass drivers. The one the left normally sits in the center of the speaker, it is lower tuned. The one on the right is higher tuned. Still, these are bass drivers not very high performing at higher frequencies even if their response is wide band. The basses of the older T-IIIA is flat up to about 4 kHz but does not sound like that.
  
  Edits: 01/15/25
  - RE: Tri-amping T IV-A's with tubes? - UncleMeat 12:26:03 01/15/25 (1)
    Yes, understood Roger. My T-IV's don't have a tuning button on the 'low' panel. The mid-bass panel looks similar to what you've posted but the center button is higher, closer to the top support bar than the second one down.
    - RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 02:08:43 01/16/25 (0)
      T-IV is different, thinner magnets too. The low bass driver tuned to 43 Hz and the mid bass to 57-75-88 Hz (from bottom to top).
      
      Edits: 01/16/25

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