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The Dahlquist DQ-1W Passive Subwoofer

Manufactured early 1970's to early 1980's
Dimensions (HxWxD in cm): 67 x 47 x 35
Weight: >27kg (about 59 lbs)

The woofer element is a 13" SEAS 33 F-WK DQ
with injection moulded Aluminum Alloy Chassis,
edge coated paper cone with rubber surround
and inversely mounted paper dust cap.

Specs (SEAS 33 F WKA - ca. 1985):
Frequency range: 25 - 1000 Hz
Nominal Impedance: 8 Ohm
Nominal Power: 70 W (DIN 45573)
Music Power: 120 W (DIN 45500)
Sensitivity: 93 dB SPL
Operating Power: 2.0 W
Free Air Resonans: 22 H