Each model costs less per watt on 12v than prior models.
As our overall business has shifted more towards sales via B&M shops an increasingly smaller percentage of customers need high voltage stability. In the previous generation even the SAZ-1200D was stable to 19v -- it's been cut down to 15.5v on all SCV models; also the SAX-150.4 is capped at 15.5v where the 125.4 model ran to 19v as well.
This, again, allows more wattage per dollar and per size than previous generation models.
The NS-1 is also on it's last production cycle along with the SAZ-5000D; we will introduce and SCV-6000D in place of those two models. Dyno results and clamps tests forthcoming on that one as well.
We may consider a large "NS" model amplifier again down the line but we have currently shifted all amplifier models to more dealer friendly 12v versions.