SP168HT-SP320HT - MONACOR's most ultimate solution for Bass Drivers from the 80s

I am looking for the manufacturer of the no longer available and obsolete speaker models from follow MONARCH models:
1) SP-168HT
2) SP-210HT
3) SP-260HT
4) SP-320HT

Very special by all models was the surround rubber material
with extremely low friction losses (high Qms values) and
extremely low temperature dependence at the same time.
Therefore one get very clean and tight bass reproduction by this models

Successors in this kind are very hard to find. For this reason the next step is to find out the manufacturer.
Who knows this?
In the attachment you will find various pics.
 

Attachments

  • Monarch SP-168HT- order code 10.1790 front.jpg
    Monarch SP-168HT- order code 10.1790 front.jpg
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  • Monarch SP-260HT- order code 10.1770 rear.pdf
    Monarch SP-260HT- order code 10.1770 rear.pdf
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  • Monarch SP-260HT- order code 10.1770 front.pdf
    Monarch SP-260HT- order code 10.1770 front.pdf
    39.5 KB · Views: 173
  • Monarch SP-210HT- order code 10.1780 terminal.jpg
    Monarch SP-210HT- order code 10.1780 terminal.jpg
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  • Monarch SP-210HT- order code 10.1780 rear.jpg
    Monarch SP-210HT- order code 10.1780 rear.jpg
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  • Monarch SP-168HT- order code 10.1790 rear.jpg
    Monarch SP-168HT- order code 10.1790 rear.jpg
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  • Monarch SP-168HT- order code 10.1790 impedanz.jpg
    Monarch SP-168HT- order code 10.1790 impedanz.jpg
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  • Monarch SP-168HT- order code 10.1790 front-II.jpg
    Monarch SP-168HT- order code 10.1790 front-II.jpg
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  • Monarch SP-320HT- order code 10.1760.jpg
    Monarch SP-320HT- order code 10.1760.jpg
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  • Monarch SP-210HT- order code 10.1780 front-II.jpg
    Monarch SP-210HT- order code 10.1780 front-II.jpg
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It's not Monacor is it ? It's just that the name sounds similar and the model numbers are similar too (SPH-xxx)
Monacor was only the supplier.
Monacor: Frontpage

There are available OEM loudspeaker drivers from a wide range of manufacturers like
Eminence Speaker | The most trusted name in audio since 1966. Great upgrades for JBL, Celestion, Jensen, and Fane.
Tangband Speakers
LPG Lautsprecher-Produktions-Gesellschaft
Dayton Audio Manufactures Speakers / Drivers, A/V products, and Speaker Building Components
P.Audio System Co., LTD
Fane International, a comprehensive range of matchless chassis loudspeakers
and much more.

My question is, from which manufacturers are the models mentioned by post #1.
This manufacturer, that I want to know, built these speaker models exclusively for Monacor.
 
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