Advice from Matthew Ratcliff in ANTIC VOL. 7, NO. 1 / MAY 1988 / PAGE 26, as reproduced at AtariMagazines.com . 2400-BAUD SPEEDSTERS If you truly have "the need for speed" online, shop for a good 2400 baud modem. Prices are coming down to the $200 range. It was the only result for a Google search on "use a modem speaker," which was among several attempts to find out if it makes sense to scavenge the speaker from a 56k US Robotics modem.