On September 2011, SMSL released a new model of SA-S1 & SA-S3, the different between the old model and the new model is that, the new model is come with Air-coils, the Air-coils is a red parts inside the amplifier, both SA-S1 & SA-S3 have four part of Air-coils.
In this new model of SA-S1 & SA-S3, they all come with three colors, silver, black & golden. Golden is a newly added color.
The following is the spec. of the SA-S3 (TA2021B):
Panel Color : Silver or Black or Golden
Fit Color : Black
Case Material : Aluminum
Size : 148mm (D) x 32mm (W) x 97mm (H)
Weight : 450 kg
T-Amp IC Tripath TA2021B
Output Power 2 x 25W @ 4ohm, 2 x 13.5W @ 8ohm
Dynamic Range 100dB
Power Efficiency 81% @ 25W, 4ohm, 88% @ 13.5W, 8ohm
Audio input: RCA x 1
Power socket (5.5mm/2.5mm) x 1
Circuit board : 1.6mm thick, full-fiber, deep golden
Speaker OUT (Left) x 1 pair (+ / -)
Speaker OUT (Right) x 1 pair (+ / -)
Power Indicator (Red LED) x 1, (Blue LED) around the volume control x 1
Power Supply input DC 12V~14V 4A
Since this amplifier like other SMSL T-Amp is BTL output, that is to negative side of speaker out is not public grounded (the two speakers cable must independent connect, no grounding together), we must strictly in accordance with the marking of plus or minus cable connection, this T amp is not recommend for car or bike use, if the DC volts input higher than 14V or we may damage IC.
SA-S1, SA-S3 have three panel color, one is silver, one is black and the other one is golden, please mention it when you purchase.
You can purchase SA-S3 (TA2021B) on the following link :
You can purchase SA-S1 (TA2020) on the following link :