Carver Amazing Platinum MK IV speakers 1980's - Black lacquer

These are high-end ribbon speakers designed by Bob Carver with the following key features that align with your description:

    1.    Frequency Response: They had a wide frequency response that extended down to 18 Hz with the help of a subwoofer system, and their ribbon tweeter handled frequencies up to 40,000 Hz.

    2.    Impedance: They featured a resistive impedance of 4 ohms, which is consistent with your specifications.

    3.    Sensitivity: These speakers had relatively low sensitivity, close to 85 dB, at 3 meters with a high power handling capacity.

    4.    Crossover & Subwoofer System: The ribbon operated from 25 Hz to 40,000 Hz, and the subwoofer system supported the ribbon by augmenting the bass below 100 Hz.

    5.    Power Handling: The Carver Amazing series was known for requiring substantial power, with the Platinum MK IV requiring up to 1200 watts, which matches your listed power specifications.

    6.    Dimensions: They were also large speakers, standing at about 66 inches high, which aligns with your size description.

    7.    Finish: The finish you described, ebony lacquer with gold and anthracite highlights, was a premium design option in high-end models like the Amazing series.

66 inches tall

Very few tiny dings but otherwise excellent conditoon

These speakers were considered revolutionary for their time, combining large, flat-panel ribbons with subwoofer augmentation to produce a wide and immersive soundstage, with very high power handling and deep bass response  .