Need help figuring/ understanding

[out4u]

So I had 2 sundown e12v2 sealed on an alpine mrv 1505 and 2 kicker comp sealed on a memphis pr 1.500 we'll the alpine amp stopped working recently but the low bass was strong with that setup . Now that it died I hooked all 4 subs to memphis and it's super clean and loud on high bass but low bass is gone, subsonic is all the way down . I know the power is less but the high bass almost seems louder

[rockFord_Expedition]

It's probably just perception. How low is your SSF set? How low was the other one set? Where was the lpf set at on each one?

[out4u]

Ssf goes to 20 the alpine didn't have one LPFwas set on about 80 for both but it's a clear difference