Hi Vitaly,
Thanks for the interest in our amplifiers. During the lifespan of a product, running changes are made to improve performance and/or reliability, the original slash series amplifiers had a long life span, there had been a number of running changes made, it was time to integrate those changes into the circuit board. So, the circuit board needed to be redesigned, we decided to address anything else that we could at the same time. The Thermal efficiency was increased so that now, it takes 50% longer for the amps to go into thermal protection than it had before (this wasn’t a problem before but, we had the chance to improve it so, we did). The amps are very slightly slimmer in profile than the original slash series, and, the appearance was cleaned up further.
Ward Benjamin
JL Audio, Technical Support
10369 N. Commerce Parkway
Miramar, FL. 33025-3962
www.jlaudio.com