THRESHOLD S300


I would love to know what the difference is between the S300, the S300 (series 2) the S300E, etc. Also, can anyone suggest the best pre-amp to use with the S300? Any information would be greatly appreciated. Thanks much.
rbwinterlink
any THRESHOLD is a present!
 Enjoy.

 Years back, my friend worked for roadrunner records, 
 went in studio, threshold maps and B&t monitors.

 Threshold is superior to most”
Hello, everyone! Im pretty late to the party but I just purchased my first Theshold amp. Iv been wanting one for 30 plus years after first hearing one on a pair of B&W 801s! I bought a S300 bit it does say optical bias on the tag! Anyway Im going playing fore while and then see about doing a recap on it! Its black which i herd is harder to find? Im located in SC i was wandering if anyone could give me a heads up were to take to or send to for a recap?? Im so glad I found this thread.

Thank you!