Speaker Asylum

2.5 also allows for higher efficiency due to using less or no Baffle step

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Edp

In Reply to: RE: There is another option! posted by Ole Lund Christensen on April 09, 2022 at 14:05:05

Might get 2 to 4db that way depending on midbass used

Follow Ups:

Consider the PSB T600 tower: a 3.5.5 way! - Brian H P 12:09:26 04/11/22 (6)
Topmost woofer crosses to the midrange. Middle woofer fills in the baffle diffraction loss. Bottom one supplements the other two at the very lowest frequencies, increasing bass extension a bit.

A clever and complex approach, and apparently successful judging from the reviews. Only trouble is, all three woofers are in parallel at the lowest frequencies, resulting in a wicked-low impedance. Only high current muscle amplifiers need apply.
- Would all three woofers have to have the same impedance? - MWE 10:42:32 04/12/22 (5)
  Didn't know if at least one (say, the upper one) could have a little higher intrinsic impedance to help with the overall impedance when all are in parallel? Or would that cause problems?
  
  Mark in NC
  "The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon
  - Not necessarily, as long as they're the same sensitivity, but I think they're identical - Brian H P 12:50:07 04/12/22 (4)
    JA's measurements, linked below, show an impedance minimum of 3 Ohms around 120 Hz, and a broad band slightly above 4 Ohms from 300 to 700 Hz. This is consistent with three nominal 8 Ohm woofers rolled out at different frequencies.
    - https://www.stereophile.com/content/psb-synchrony-t600-louds (Open in New Window)
    - Sorry, didn't make myself clear, was talking more theoretically..., - MWE 13:49:54 04/12/22 (3)
      whether woofers with a bit higher individual impedances could be used in order to raise that 3 ohm combined minimum a bit. Not referring specifically to this speaker model, but a theoretical but similar design.
      Just speculating.
      
      Mark in NC
      "The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon
      - If you changed one driver to 16 ohm it would only change to 3.2 ohms - Edp 16:38:56 04/12/22 (2)
        
        In Reply to: RE: Sorry, didn't make myself clear, was talking more theoretically..., posted by MWE on April 12, 2022 at 13:49:54
        
        Your suggestion will work and has been used in speakers before
        
        But to do any serious change to minimum, all three drivers would need to be to 12 to 16 ohm to even have a chance of getting 4ohm minimum (including most xover designs)
        
        Alas, 16 Ohm drivers are rarer than hen's teeth anymore - Brian H P 12:46:22 04/13/22 (1)
        
        In Reply to: RE: If you changed one driver to 16 ohm it would only change to 3.2 ohms posted by Edp on April 12, 2022 at 16:38:56
        
        Madisound had some 16 Ohm, 6.5" Silver Flute woofers awhile back, but they sold out while I was still sketching out cabinet and crossover ideas for them.
        
        I honestly don't know of any others that are readily available.
        
        A speaker manufacturer could have them custom-made in commercial quantities, but an individual, not so much. nt. - MWE 07:12:36 04/14/22 (0)
        
        In Reply to: RE: Alas, 16 Ohm drivers are rarer than hen's teeth anymore posted by Brian H P on April 13, 2022 at 12:46:22
        
        Nt.
        
        Mark in NC
        "The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

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