Audio Systems: JL13W7, 1000 watt amp, fine amplifier

Question
I have a JL13W7 1.5 ohm subwoofer that im installing in my car,the question is thers two ways i can wire it to the amp one way will give me a 3.0 ohm load the other gives me a 0.75 ohm load.Im not so positive which will give me better performance,I have the JL 1/1000 watt amp.One more question i have is what HZ load i should set on my head unit for this speaker,i just want ultimate performance with all music types at high Decibals with low bass.  If u could give me any helpful info i would so much appreciate it,Thankyou

Answer
The JL amp you refer  to is a mighty fine amplifier  but it does not support a load of .75 ohms.  To do so may endanger its reliability.  Therefore, you are wise to use the 3.0 ohm connection.  That will run the amp much cooler and will lengthen its life.  Loss of power transfer to the speakers is minimal.  Optimum loading for this amp - to get the 1kw out - is 1.5 ohms according to their published specifications.

The crossover point is for your choice - which setting gives the best sound it the one to use.  A proper setting is a function of the midrange drivers and how far they are going down in frequency response.  The crossover point is therefore a system design question.  But, in the final analysis it is the sound quality that is important.

To do a listen test, use music program material that has good strong, deep bass along with male voice.  Listen for proper sound of the vocal while bass is full and complete. If the vocal is shallow or if the bass is weak, then make the adjustments by increasing the crossover point. If the sound is muddy and boomy then lower the crossover frequency.

Hope this helps.

C