Historic Acoustic Research AR-3 Speakers. I have forceably removed covers to take photos what is behind covers. Im not a Stereo expert, but I have connected to a stereo and speakers do perform and make clean sound in my opinion. Covers and frames were glued in, so know the frame were broken and re-glued to get back to previous condition. Previous owner probably replaced original covers and replaced with these by using fabric glue. No guarantees on the perfection of sound.