F-10D is a rare catch these days...!
Since you want to drive your all subs side by side....So you need an minimum 1000 rms mono amp....Because your all pair of subs is under 1000 rms category..!
Go for Sound magus X1502 mono amp...!
New one available in pindi,around 15K....!
Can serve you the best whenever you hooked up any pair of subs with it...!