Polk Audio 5 piece surround speakers

Polk Audio Black Stone TL250 compact surround sound speaker set. Includes four compact satellite speakers and a center channel speaker. From the manufacturer:

• Time Lens technology aligns the drivers for better soundstaging and imaging.
• frequency response: 125-20,000 Hz (-3 dB) handles up to 125 watts.
• sensitivity: 89 dB (satellites); 91 dB (center channel) impedance: 8 ohms.
• satellites each contain a 3/4" silk dome tweeter and a 3-1/4" Dynamic BalanceTM mid/woofer.
• center channel contains a 3/4" silk dome tweeter and dual 3- 1/4" Dynamic BalanceTM mid/woofers.
• PowerPort® technology for better bass response.
• steel-plate reinforced cabinets fight internal resonances.
• curved enclosures with high-gloss finish.
• threaded insert for use with optional speaker stands or brackets.

satellites include keyhole slots for easy wall-mounting satellite speakers: 4-1/8"W x 7-1/16"H x 5"D (each) center channel speaker: 16-5/8"W x 4-1/4"H x 3-13/16"D.