[LAU] The early beginning History of Digital Crossovers...

Software/Hardware Hybrid:
1998
Yamaha DSP Factory DS2416 + AX16-AT
4-band eq, 
Hi & Low bands can be switched to Hi-pass & Low-pass Filters *Unknown slope.
https://usa.yamaha.com/files/download/brochure/4/320264/ds2416.pdf
http://www.oldschooldaw.com/manuals/cubase/CubaseSX/SX/PC-2002/cubaseSX_v1.0Docs_Using_Cubase_SX_DSP_Factory.pdf
https://uk.yamaha.com/en/support/updates/index.html?c=proaudio&k=DS2416

Creamware Scope pci / Soniccore 
for macOS 9.2 / PowerPC G4 G5
but also worked on Windows, and OSX 10.4 

Ensoniq Paris ..

Software Only: 
2006 - 2019
thuneau allocator for WinXP
https://web.archive.org/web/20190716065853/http://www.thuneau.com/allocator.htm
https://web.archive.org/web/20140530212406im_/http://www.thuneau.com/images/alloc_lg.gif
had -24dB/Oct,  -42dB & -60dB/Oct

Hardware:
Yamaha D2040 "Digital" was interesting, F1040 "Analog"
JBL DSC 260 & 280 "Digital"
were rebranded BSS Omnidrive 260 & 280
JBL had Orange LCD display, 
BSS had Blue, 
maybe DACs were different JBL had 20-Bit,

dbx 260 "very popular" had different DSP algorithms, 
included a digital version of the dbx 120xp / 120a sub-harmonic generator.
dbx has many models of the 260, 360, and very large Pro models 480 / 4800...

there were "rare" brands,
like Dynacord, EV, etc...

Analog:
DOD 835
dbx 234xl
JBL M553 / M552 
Rane AC
Ashly XR / SC
Furman X-424 / X-324 / TX-3
Peavey 
Crown
Crestb cpc 1234
Behringer
Symetrix 524e
were the "go to"
UREI 525 was more rare,
BSS FDS-318 was the most desired analog crossover from BSS.
all other Analog crossovers from BSS had Fixed resistor network cards, 318 was variable.
Klark Teknik DN800 was also fixed network cards, DN 8000 was "Digital"
QSC had an Optional Add-On Crossover Card for PLX, DCA & PL2 amplifiers, similar was included by default in PL2A 
Peavey CS had "filter plug type crossovers" like vacuum tubes, but pre-made crossovers.
some speaker brands have its own crossover, like Yorkville, Apogee audio, Bose.

Crossovers could be done "Analog"
Horn loaded loudspeakers,
increasing the front chamber of the speaker before the Horn Throat.
creates a natural roll off in the highs.
Horns are "Band-Pass", and can be "Tuned".

Most Pro Audio Class-D amplifiers have DSP built-in, to replace external digital crossover units "lower cost".

Hardware outlast Software,
Software is Vaporware.

Hybrid depends,
sometimes 60/40 other times: 40/60.

for example:
RME hdsp9632 pci card
works flawless but...
Linux source code has small bugs since Ubuntu 13 probably Cosmic Ray Flip type,
bug accumulate, becoming almost unusable in 20.04 LTS with Alsa driver.

Most Analog crossovers & eqs emulate Coils / transformers using Op-amps + capacitors.
most have Servo-Balanced I/O's
to emulate Balanced I/O Transformers.

everything is an emulation of an emulation. LOL
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