What are your thoughts on the "Edsels" of the audio history?

Soundcraftsmen equalizers. Did more harm than good.

Electrovoice speakers.....when I heard them they sounded good (12trx in homebuilt cabinet)

Ah..yes, the spring reverbs in cars....very entertaining with each bump. 

@ericsch wow did your post mentioning soundcraftman EQ bring back memories. I used to sell them and also sold these 2-300 watt per channel soundcraftman amps and Sold them with Cerwin Vegas with 15 inch woofers.  Led Zepplin, Molly Hatchet,  AC-DC, never sounded better. HA!

Anyone remember this bomb?

ELCASET was an analog cassette tape based audio format developed by SONY in cooperation with Matsushita (Panasonic) and TEAC in 1976. It was intended to offer a reel-to-reel system sound quality in a convenient cartridge format. The name comes from the expression "large cassette" or "L-cassette". Although the ELCASET used a 6 mm (0.25 in) wide tape running at 9.5 cm/s (3.75 ips), twice the width and twice the speed of a PHILIPS Compact Cassette it became a complete failure in the marketplace and by 1978 it completely faded-out from the market. This happened mainly because Compact Cassette had a more compact format and the dramatical improvement with the introduction of new tape formulations such as chromium dioxide and lower noise with the introduction of the Dolby B noise reduction circuit.