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In Reply to: RE: there are differences, but you are correct posted by Inmate51 on September 16, 2024 at 16:26:13
Uncertain what specific data you would like.Basics are with an iron ,steel, pressed metal powder, one gets less ( often far less) DC resistance, smaller size and less cost ( much less for big millHenery values ).
DCR in a bass application's will alter the actual driver parameters to enclosure tuning , especially for bass reflex and transmission line , to the point youcan almost turn a bass reflex driver into a sealed driver. Is this the area you are looking for data. Impacts to bass performance by inductor choice?
I'm operating on the premise that Jon made this trade off of overall lowered DCR to lessen the impact to bass so as not to have to increase baffle step
Usage outside of the bass range will still have DCR impact but to a far far less degree.Air coils will have far less distortion but can saturate much faster at lower power. Low power is not 300b amp range , more like arc welder amp.
I'm certain there are more articles more recent than a 1996 Speaker Builder magazine -Inductors For Crossover Networks, but was comprehensive enough for me to not need revisiting newer sources. Measurements for IM and THD for most types, various core materials , air wire, air foil, even toroidal units.
Basic guidelines from that is bass is DCR dominated , above bass size and cost offsets are the main (only?) reason to choose over the lower signal distortion of a non cord inductor.
So in the design in question, one of the lowest distortion, extremely linear , and from most accounts from actual designer/users of drivers listening experiences , I believes deserves the lowest distortion components at the cost of either some bass extension or efficiency. I doubt size was a factor in this case.
Edits: 09/17/24Follow Ups:
Curt Campbell (link) as far as I know has about 24 commercialized (kit) designs to his credit, and he also was the principal crossover designer for Salk Sound--I was sad to see them go!
I was particularly happy to have Curt do the heavy lifting, because of his experience at Salk with... Purifi drivers.
I have designed more than 12 completed monitor or satellite speaker designs and four subwoofer designs. This speaker was the most ambitious project, but the client wanted
(i) speakers that would "glorify" well-record vocals, and
(ii) be small, but sound large.
If I had to do it all over again, I would use two each of the Purifi PTT5.25s per side, to restore the lacking 6dB or so the BSC chewed up.
Riv and rurn.
john
Looks like much thought and analysis went into their R&D for their drivers.
Eschewing phase plugs and dust caps as also in the Thin Ply Carbon drivers from Borrensen to many others. I wonder if the "bullets" and caps in the center of drivers may be a thing of the past even though they served their purpose in aiding off-axis dispersion and literally keeping dust out?
Edits: 09/18/24
Size of a cereal box that fully produces the 1812 orchestra that registers on the Rickter Scale.
Trade offs and compromises in every dang one. Maybe some day I'll get one without any, yah right.
Bit pricy for an extra driver to do point 5 work ( 2.5 way ) though
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