Morel Tweeter Replacement Guide.
Here is a table showing the old classic Morel tweeter models and their modern suggested replacements:
| MDT-29 | CAT 298 |
| MDT-30 | CAT 308 |
| MDT-32S | CAT 328-104 / CAT 328-110 |
| MDT-33S | ET 338-104 / ET 338-110 |
| MDT-37 | CAT 378 |
| MDT-39 | CAT 408 |
| MDT-44 | ET 448 |
The MDT-32S and MDT-33S have 2 possible replacements - the only difference is the faceplate diameter of its modern equivalent, either 104 or 110mm.
Further info on Morel proprietary drive unit technologies can be found here: Morel Technology
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