siefert research

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eBay

Siefert Research Maxim III Bookshelf Speakers $325 Mar 11, 2025

eBay

SIEFERT RESEARCH MAGNUM III GRILL SPEAKERS ORIGINAL $35 Dec 19, 2021

eBay

Siefert Research Maxim 111 Speaker Made in USA Brown Tested Working #1 $149 Sep 4, 2025

eBay

Siefert Research Maxim 111 Speaker Made in USA Brown Tested Working #2 $149 Sep 4, 2025