Hi Jack,
Please find attached the general brochure for SA series including 150.4FD.
For your information, the popular selling models are SA-150.4FD and SA-1300.1FD.
SA-1300.1FD, although it is a mono amplifier, it is capable of full range functions
and so, it can be used with mid-range speakers to play music.
By the way, we have many other different products (Class D monoblocks, Class AB,
Class D full range digital etc) and so, if you have interest in reviewing other products,
then I can send you a comprehensive brochure for your review.
As for warranty, it is 12 months from date of purchase and valid only for factory
defects and not defects attributable to user misuse. In case of damages caused by
user misuse, we can provide the necessary spare parts for doing repair at site.
Regards,
K.H.Choi