pro logic speakers

$39.99 VINTAGE ZENITH A/V PRO LOGIC SURROUND SOUND AMPLIFIER - Z711B 5 SPEAKERS - 80W	$55.00 SONY STR-DE325 AV RECEIVER DOLBY PRO LOGIC SURROUND W/ 3 Speakers
$399.00 Onkyo TX-DS696 DTS 5.1 Channel Pro Logic II Home Theater w/ 5 Infinity Speakers	$299.00 Apple MacBook Pro 15" A1286 2.8 GHz Logic Board/Heatsink/Fans/Speakers/AS-IS!!
$10.00 Sherwood RV-4050 Audio/Video Pro Logic Receiver with Speakers, Dolby	$107.99 Fisher Pro Logic Surround Sound SPEAKER SYSTEM WS-424[NIB]