Hi. Can anyone help me identify this speaker and its manufacturer? These belonged to my late father-in-law, but have no sticker on the back. I’m assuming they’re from the 70’s, but may be older. They have a logo on the front that I’m unfamiliar with, plus a unique grill pattern. Also, there are two other sound ports on the side in addition to the one on the front. Any help would be greatly appreciated. Thank you.