For sale is my beloved Acoustic Research MST Speakers. Information from the net. Information provided from Steve F. The MST was introduced in March 1975 along with the 11 and 10Pi as part of AR’s new ADD (Advanced Development Division). The cabinet was shaped like a smaller version of the LST, with three radiating cabinet panels–one forward facing, and two angled away to the left and right of the front panel. It used an 8″ woofer and three 1 1/4″ cone tweeters (similar to the tweeter in the AR-6 and -7), not the 3/4 dome. The speakers were mirror-imaged, with two of the tweeters side by side above the woofer on the front panel, and the third tweeter on the side panel. One side panel was blank. AR’s instructions were to orient the speakers with the tweeters on the inner panels for a more tighly-focused stereo image, and to place the speakers with the tweeters facing out for a more diffuse, spacious effect. The forward-facing tweeters crossed over from the woofer at 1600Hz; the outer tweeter handled frequencies above 5000Hz. I really love this classic Acoustic Research Air Suspension design speakers. Back then I would love to own a pair of AR-LST but this is rarely appeared in the secondhand market. I also learnt that it needs big and powerful amps to drive them so I look into this little brother. In fact I think it suits us more in our small space. This pair has both bass units refoamed so plenty of life left. One speaker is in EX++++ condition but the other one just has a drop from my AR92 and makes a crack on top. It can be repaired quite easily with sanding and filling. Pictures will be shown later due to not enough time to take the pictures. I would send if you must but will be expensive since t needs to be sent in two boxes. The following youtube videos links are the actual MST performing. The item “Acoustic Research MST Classic Speakers” is in sale since Sunday, December 16, 2018. This item is in the category “Sound & Vision\Home Audio & HiFi Separates\Speakers & Subwoofers”. The seller is “revoxa7gh4″ and is located in norwich. This item can be shipped worldwide.