Front speakers:

Very well reviewed pair of Klipsch Synergy SP-1 tower speakers and center speaker SC1. Very good condition.

SP-1 tower speakers:

Three way system, with the following components: one 5.5" K107 -SV magnetically shielded mid-bass woofer featuring a polymer housing and IMG cone; and one 1" (2.54cm) K-101-S neodymium magnet, aluminum dome compression driver with a 90° x 60° Tractrix Horn. System response is 30 to 20khz frequency response. Speakers are 37" tall, 9" wide, 14" deep, and weigh 47 lbs each. Excellent reviews online, including Audioreview. One review saying a great $600.00 set of used speakers.

http://www.audioreview.com/product/speakers/floorstanding-speakers/klipsch/sp-1.html

Disclaimer: although they are powered with built-in subwoofer, please do not use power for these tower speakers. Because built-in subwoofers are either loosely connected or give humming noise sometimes. The speaker are perfect when used as regular non-powered tower ones.

https://hometheaterhifi.com/volume_7_3/klipsch-synergy-sf-1-speakers-7-2000.html

Klipsch SC 1 Center Speaker:
Two-way system using one 1" (2.54cm) K-101-S magnetically shielded neodymium magnet, aluminum dome compression driver with a 90°x 60° Tractrix Horn and two 5.25" (13.3cm) K-1079-SV magnetically shielded woofers.

http://www.audioreview.com/product/speakers/center-channels/klipsch/sc-1.html

Surround speakers:
Bose 141
https://www.cnet.com/products/bose-141-speakers-wired-series/
https://www.amazon.com/Bose-141-Fullrange-Bookshelf-Speakers/dp/B00091U9YW/ref=cm_cr_arp_d_product_top?ie=UTF8

Subwoofer:
Canton AS 15 SC
https://www.cnet.com/products/canton-as-15-sc-subwoofer-wired-series/

Freebies with the purchase of 5.1 system:

pair Pioneer bookshelf speakers + Onkyo MRX multiple room remote system AV receiver.

Pick up in Menlo Park. $250 for everything obo.