Old amp+new OEM head unit

I am adding and old Acousta amp to my 2003 Tacoma OEM stereo system.  If I tap into the rear speaker wires only (bass) will I need and inline low pass filter (cross over) or not?  I was told by an installer that I did not,  but need a 2nd opinion.  The amp is going to power an old Bazooka bass tube w/ two 8" subs, one on each end. (It cranks!)

I used this set up in a 1990 Toyota Extended cab, but it has been awhile since it has seen action.  (the amp+tube) And I do not recall exactly the color scheme of the wiring.  If it is at all the same or not.  Anyone?

Thanks in advance.

Shawn

Thank you "esmith69" .  I am pretty sure w/o looking, that the amp has no crossover feature.  One more question.   To run a Bazooka bass tube which of the inline crossovers should I use.  I am unsure of what freq I need for that particalar set up.

Thanks

That really depends on the specs of the subs themselves, but I'd probably recommend the 100 Hz low-pass model.  If you get them from Crutchfield, remember they  have free return shipping so you might wanna get the 100 Hz and the 200 Hz and just see which one sounds better to you.  Then just return the one you don't end up using.

The 100 Hz is what I assumed once I re-checked that site you gave me.   Thanks for your help!

Shawn