ONKYO Center Speaker D-077C

The model number sticker is missing.
The product number has been determined based on its shape and other features.

Confirmed that sound is produced when connected to an amplifier.

Below is an excerpt from the online instruction manual:

[Main Specifications]
Type: 2-way sealed
Rated impedance: 6Ω
Maximum input: 40W
Rated sensitivity level: 77.5dB/W/m
Rated frequency range: 150Hz - 35kHz
Cabinet internal volume: 0.23 liters
External dimensions (W x H x D): 357 x 63 x 70.5 mm (including grille and terminal protrusions)
Weight: 0.5kg
Speaker units: Woofer: 15cm x 4cm planar speaker
Tweeter: 2cm soft dome type
Terminals: Gold-plated brass machined speaker terminals, not compatible with banana plugs.

May be shipped from Osaka Prefecture.