dc 3.5 k, sundown scv 4000D, ct4000.1D, crescendo bc3500D ...many other amps which may be a little over the 4k u looking for..like incriminator audio, ddm4a, american bass vfl 450.1, soundqubed Q1-4500D.1
i had a dd 3510...was one of the best sub's i ever had...had it tuned to 35 hz...it died from giving it 2500 rms .....if it was me i wudd put 2 9500 j's on one of the new hcca 5000.1..padna get one ah dem amps and d birth sheet say 5982 @ 12.6