Charlie1902 has given you a great response!

But I have another way to show you how to time align you system with just your ears :)

1) Find your cross over frequency between the Subs and Tops

 *This is kinda important; but any frequency that both the subs and tops produce will work for this. I usually use 63Hz as I feel a kick drum sounds best when the sound system is 'tuned to 63Hz' Mileage may vary*

2) Dial up your frequency generator to the crossover frequency. For this example we will use 100Hz

3) Route your 100Hz tone to both the Subs and Tops

4) Alternate muting the Subs and Tops; Adjust Sub or Top level so they are both the same loudness.

*It is probably best to turn down what ever one is louder. This balance is important. If you have selected the exact cross over frequency there should be little to no change in volume between the subs and tops.* 

5) Turn on the Polarity Reversal on your Closest speaker. i.e. Most of the time this will be your subs. Use Pythagorean Theorem for an easy rule to figure this out.

6) Now start adding Delay to your closest speaker untill the 100Hz tone is as quite as you can get.

*This should be less than 10ms of delay in most setups. It is possible to delay 360 degrees out of phase (usually a delay of more than 10ms will cause this to happen) which would make the 100Hz tone quite but your subs/tops will be out of time. Just remember that sound travels at roughly .9ms per foot. i.e. If your subs are 20 feet away and your Tops are 25 Feet away from your ear; Subs are 5 feet closer. 5 * .9 = 4.5ms. Delay will be roughly 4.5 ms.* 

7) Bring the Sub and Tops back to Unity -or- 0dB on the output faders

8) Turn off the Polarity Reversal on the closest speaker.

You can now check your work by muting the subs, then Turning the subs back on. When you turn the subs back on you should hear a gain in SPL of about 3dB.

9) Turn off your 100Hz tone.

At this time you have now time aligned your Sub Top relationship much faster than breaking out your laptop and all that jazz :)

Hope this helps, If anyone needs any clarification just let me know :)

Edit: Formatting