Are there any woofers that roll off smoothly?

Here's more-

Aurum Cantus AC130F1
composite polymer cone, square frame
https://www.parts-express.com/pedocs/specs/296-400-aurum-cantus-ac-130f1-specifications-45624.pdf

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some Commercial speakers
from Tetra:
"With our patented single-cap Artet wiring, our innovative air-scoop baffle and our tried and true plane alignment, we have left no sonic stone unturned in the Tetra 222 design.

Crossover frequency 3 kHz
Woofer 5" Peerless Glass Fiber Cone, Rubber Surround
Tweeter 1" Morel, Textile Dome Diaphragm

Looks like: 1 cap, Morel ET448 , Peerless GFC 830991 , angled cabinet (extend the baffle bottom or put spikes on the front bottom on a regular box)

High End Speakers-High End Studio Monitor Speakers-High End Reference Monitor Speakers-Surround Audio-Surround Sound Audio-Best Sounding

They put this on top of a bass module for the Tetra 333
High End Speakers-High End Studio Monitor Speakers-High End Reference Monitor Speakers-Surround Audio-Surround Sound Audio-Best Sounding

Tetra 222- looks like an earlier version used the Morel MDT12

reader 14

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Tetra 120U
from Tetra,
" utilizing only a single proprietary capacitor on the tweeter ensures that every musical nuance and explosive detail gets through and provides you, the listener, with a 'Tetra moment.' " (sales pitch-ooohh ahh)

Woofer 5" Peerless Polypropylene Cone, Rubber Surround
Tweeter 1" Morel, Textile Dome Diaphragm
Power handling 200 watts per channel
Weight 8.5 lbs (4 kg)
Dimensions 10.5" H x 9" W x 7.5" D (27 cm x 23 cm x 19 cm)

Looks like: 1 cap, Peerless 830860 poly cone , Morel MDT12

High End Speakers-High End Studio Monitor Speakers-High End Reference Monitor Speakers-Surround Audio-Surround Sound Audio-Best Sounding
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Watkins Generation Four
Dimensions: 8.5″ x 14″ x 13.5″ = .61 cu ft or 17 litres (3/4" material)
https://www.watkinsaudio.com/

https://www.theabsolutesound.com/articles/watkins-stereo-generation-four-loudspeaker/

"Drivers: One carbon-poly 6.5" woofer-midrange, and one 1" magnesium alloy dome tweeter"

"The front baffle is angled backwards to time-align the drivers by placing the acoustic center of the tweeter behind that of the woofer. This also helps to match the sensitivity of the woofer (88dB) with that of the tweeter (91dB) without the use of a resistive pad. The tweeter is crossed over at 3kHz using a single capacitor, and that’s it; there are no other passive components in the signal path."

"the woofer, a modified Peerless by Tymphany 6.5″ unit," <= (830874 ?)
A different dust cap? It looks like a ring of something on the dust cap.

"The tweeter is a SEAS H-1212 1″ aluminum/magnesium alloy dome modified to Watkins’ specs."

Polypropylene Black (PPB) cone material Peerless 830874 sensitivity 88db
https://www.parts-express.com/pedocs/specs/264-1090--tymphany-hds-p830874-spec-sheet.pdf

16 litres vented
https://www.falconacoustics.co.uk/downloads/Peerless/Appnote_830874.pdf

Modified Tweeter
SEAS Prestige 27TBFCG (H1212)
https://josephcrowe.com/blogs/news/2100

Watkins Generation Four
060c13_b461778b258149f2b139b541e02b05dc~mv2_d_7208_2897_s_4_2.jpg
 
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This is spurred by post #48 at
https://www.audiosciencereview.com/forum/index.php?threads/human-speakers-81-dk-review.50915/page-3
"The woofer is supposed to naturally roll off ...in order to gentle cross with the tweeter that uses a single capacitor as the whole filter crossover" to which I replied "Once upon a time, I made something like that. And recall some drivers like that. Nowadays, I've been looking at a lot of different types and sizes of woofers and NADA. Nothing seems to roll off smoothly any more."
?!?
Am I blind? Missing something? Everything seems to have resonances on the top end and gyrations in frequency response...
Funny, the Bose 201/301's follow the same formula.
 
1 cap- fullrange Peerless TC9FD18-08
Nola Brio Clone
https://www.diyaudio.com/community/threads/impressed-with-the-peerless-tc9fd18-08.314641/page-4

Trio Brio Clone Plans Post #178

perceval

I just revisited the TC9 in the Nola clone, and I finally got it right.

Just by playing with C-C distance and phase, I was able to get the flattest response I've ever had or seen for a setup without active EQ, passive notches nor even BSC, and only one capacitor in the whole signal.

Clean, clear and detailed...

Measurements and pictures here:

Need help building open baffle/bass reflex hybrid

"For fun, I tried to wire the drivers out of phase, no cap.
And finally again out of phase, with the cap."

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