High Efficiency Speaker Asylum

Re: BLH "At a more advanced level"

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In Reply to: Re: BLH "At a more advanced level" posted by freddyi on February 18, 2005 at 08:19:37:

Assuming the K-slot Vs stock Fostex is the FR you're referring to, it would need to be attenuated somewhat in a small room, with the amount based on how far out into the room they can be placed and what LF room gain curve is. WRT too-tall or not, that's room layout/personal preference thing. I personally prefer to have them a bit higher than ear level since we're normally positioned below a stage act, etc..
GM

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Re: BLH "At a more advanced level" - freddyi 09:42:44 02/18/05 (8)
yep GM -
anyone besides Moray building original K-type?
Freddy
- Re: BLH "At a more advanced level" - GM 10:04:39 02/18/05 (7)
  ?? Seems like you'd know most/all of them. You know I don't keep up with the Karlsonites since I prefer true midbass horns. I do like the slot for BR/TL/ML-TL vents though. Just wish I had the math smarts to figure out how to calc/sim the results.
  GM
  - Re: BLH "At a more advanced level" - freddyi 10:29:13 02/18/05 (6)
    given enough room size I might prefer true midbass horn - but coupler (if don't get funky) are interesting - like 'em best with coaxial
    got any Zen feel for how to build a Karlson type past original?
    heres a commercial bin by Yorkville ~11.2cu.ft. at 1W outdoors
    unity 1W
    perhaps due to ingorance - I tend to like low moving mass in almost anything - is this just stubbornness?
    Freddy
    - Re: BLH "At a more advanced level" - GM 10:48:21 02/18/05 (5)
      Well, the little 40-1197 BP one I mentioned to you was a reverse tapered TL folded back on itself to load the driver, but it will be larger than an equivalent BW multiple reflex one due to the need for the pathlength to either be longer or have a much higher aspect ratio, which may make the final front section's shape too far off to get the desired slot shape/area. If/until I ever get around to experimenting, I'm clueless as to how much taper can be tolerated.
      - Re: BLH "At a more advanced level" - freddyi 11:33:49 02/18/05 (4)
        
        In Reply to: Re: BLH "At a more advanced level" posted by GM on February 18, 2005 at 10:48:21:
        
        with traditional K, Carl extends height aspect, leaving ~same slot height - theres a 1/4 ellipse reflector within that enclosed portion- dunno if he gets a bit more LF-smoother mids or both - may be very subjective to builder/listener.
        tough to do A-B switching of two Karlson as one not hooked up may emit energy from midbass into lower midrange.
        Beta 12CX plays 'ok" in X15 (~2.1cu.ft. rar chamber)- could use lower Q although SP15A has enough mids to mask 'some' LF peaking- same story for Sigma 18 in a K-type with about 4cu.ft. rear chamber - also lower Le could help on the 18.
        heres a near-slot by Lapaire - is this hinging just pressure distribution effects? - bottom green trace is towards floor.
        graph slot
        
        Re: BLH "At a more advanced level" - GM 11:57:40 02/18/05 (3)
        
        In Reply to: Re: BLH "At a more advanced level" posted by freddyi on February 18, 2005 at 11:33:49:
        
        I assume so. Is this an in-room plot?
        GM
        
        Re: BLH "At a more advanced level" - freddyi 12:03:22 02/18/05 (2)
        
        In Reply to: Re: BLH "At a more advanced level" posted by GM on February 18, 2005 at 11:57:40:
        
        in-room -assume John had mic pretty close to aperture
        
        Re: BLH "At a more advanced level" - GM 20:12:24 02/18/05 (1)
        
        In Reply to: Re: BLH "At a more advanced level" posted by freddyi on February 18, 2005 at 12:03:22:
        
        OK, this explains the 'hinge' effect, basically he's measuring the standing waves off the floor and the losses as it folds under/around the cab, whereas higher up he's measuring the increased gain of the slit.
        The Karlsons are like 1/2 space LF/midbass horns in that they really need to be measured at least 6m ground plane to see what the real FR is.
        GM
        
        Re: BLH "At a more advanced level" - freddyi 04:57:50 02/19/05 (0)
        
        In Reply to: Re: BLH "At a more advanced level" posted by GM on February 18, 2005 at 20:12:24:
        
        will see if can get back 6m sometime and compare to 2m
        Best,
        Freddy

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