Subwoofer ?

[SlugButter]

The Dayton reference HE is an excellent sounding sub. I haven’t tried the 15, but I’m using the 10 inch version and it’s very impressive.

 

[hispls]

I have the Rockford Fosgate Punch P1000x1bd amp. It does 1000x1 at 1ohm if that helps.​

You should consider buying a woofer with 3" voice coil to reliably hang with that much power. For around the same price of that Memphis you could own Adire Brahma which is well regarded for getting loud and good sounding.

Adire Audio Brahma Mk 2.5 Rev A 15″ | 1000w XBL2 Car Audio Subwoofer

The Adire Audio Brahma has always been known as a legendary driver in the audio industry utilizing Patented XBL^2 motor technology since 2002.

adireaudio.com

 

[Kickstand]

If I'm going to buy a flat sub it better be an old-school PPI
There are probably a dozen subs I could recommend but now that DD has sold out I'll start with them.

DD Audio Digital Designs 715d-D2 15" Dual 2-Ohm 3600W Subwoofer

DD Audio Digital Designs 715d-D2 15" Dual 2-Ohm 3600W Subwoofer

www.woofersetc.com