Both drivers tested from 40 Hz to 20kHz - sound GREAT. DC resistance is 7.2 Ohms on the box I opened and 6.9 Ohms on the box I've left closed.

These AMAZING and weird drivers have been mounted in homemade boxes since the 1970s. They were designed to hang on the wall like pictures. The boxes are about 21" wide by 20" high, and 3" thick. The drivers weigh almost nothing, but I will leave it to you to remove them from these cases to prevent damage. Wooden boxes are each about 5 lbs.

Drivers are 300 x 355 x 35 mm / 11.8 x 14 x 1.4 inch. "poly-planar" loudspeaker. Impedance 8 ohms. Frequency range 40 Hz - 20 kHz. The membrane is made of styrofoam, mounted in a rigid plastic frame.

There was a discussion about these a few years ago for your reference:

This item is sold As-Described

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.Learn More.

Promoted similar listings













Listed2 years ago
ConditionGood (Used)
Good condition items function properly but may exhibit some wear and tear.Learn more
Brand
Model
  • Rare Poly-Planar P-20 Super Thin Wafer/Panel Speakers 4-way 25 Watt 8 Ohm Titanium Driver Magna
Finish
  • 1960s speaker cloth and frame
Categories
Year
  • 1970
Made In
  • United States

Product safety information may be available here.

Sound by Doc

Saint Louis, MO, United States
Joined Reverb:2020

Reverb Protection

Simple Returns, Secure Transactions, Human Support

Learn more

Secure Checkout

Reverb Gives

Your purchases help youth music programs get the gear they need to make music.

Oops, looks like you forgot something. Please check the fields highlighted in red.