need help choosing subs 18s

I have a sax 1200 amp and I'm looking to spend about 400 bucks on new subs.

I can pick up locally a older mmats 18 juggernaut with a brx 1600 for 375 package deal.

Or I am looking at a sundown x 18 or 2 obsidian 18s.

I haven't personally looked at the juggernaut yet but seems to be in good condition.

I don't have the best electrical. I have done the big three but voltage drops to 12.5 I'm just looking to get a little louder I currently have 2 infinity 1252w in a sealed box. Also would the hifonics amp put out more than the sax 1200? And I'm open to other suggestions I want spl/sql

 
I have a sax 1200 amp and I'm looking to spend about 400 bucks on new subs. I can pick up locally a older mmats 18 juggernaut with a brx 1600 for 375 package deal.

Or I am looking at a sundown x 18 or 2 obsidian 18s.

I haven't personally looked at the juggernaut yet but seems to be in good condition.

I don't have the best electrical. I have done the big three but voltage drops to 12.5 I'm just looking to get a little louder I currently have 2 infinity 1252w in a sealed box. Also would the hifonics amp put out more than the sax 1200? And I'm open to other suggestions I want spl/sql
2 OA 18's > 1 X-18

id do the 2 18" obsidian's myself over the X-18. The X-18 would have a stronger motor then 1 obsidian but 2 OA's you will have more motor power and more cone area and will be able to get loud on less power. The obsidian's will be fine on your sax 1200 seeing they are only rated 600rms each. of course they will take more but you dont have to have more

 

---------- Post added at 04:09 PM ---------- Previous post was at 04:08 PM ----------

 

I have a sax 1200 amp and I'm looking to spend about 400 bucks on new subs. I can pick up locally a older mmats 18 juggernaut with a brx 1600 for 375 package deal.

Or I am looking at a sundown x 18 or 2 obsidian 18s.

I haven't personally looked at the juggernaut yet but seems to be in good condition.

I don't have the best electrical. I have done the big three but voltage drops to 12.5 I'm just looking to get a little louder I currently have 2 infinity 1252w in a sealed box. Also would the hifonics amp put out more than the sax 1200? And I'm open to other suggestions I want spl/sql
also build a custom ported box for the 18's

 
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