sub build suggestions please

OP do look into those Crown amps. Gets the job well done at real budget cost.

Even if one didn't keep it long term there a great stepping stone.

I searched high and low, they are one of the best bargains out there.

I'm having the chance to better put it through its paces. RCA volts are a litttle on the low side, but for a PA amp I think its acceptable.

I can't wait to add subs, I'm only getting the use of 1 + one channel.

I would at least have a look, since you asked for advices. Thats mine.

BTW it suffices as is, with sealed box. However I do intend to improve upon EQ of some sort. The savings for an amp will go into an even better outboard crossover that originally intended.

It reaches low for all types of music, just what its wanted for. Placing the single near a corner fortunately worked good. It reinforces the little 8 well until I get to add more 😀 Nulls are non existent al around my sitting spot. The tiny combo works.
 
Guys, i have been lost on some replyes. I already own 4pcs Eminence PS18-6008. They are 18” drivers not 8”
No point on selling them, since i wont get a another new driver for that money.
Its been a long time i have built sealed enclosures, tryed to simulate one and found that, 50l sealed is max size for one. Any bigger wont give me any benefit vs smaller enclosure.