JL Audio 113 sub without external crossover

If you run your main speakers full range without a crossover, I don't how is sounds right unless you set the sub to kick in below your speakers lowest frequency range. If your ML Odysseys go down to 35hz and you set your sub to come in at 55hz, you're duplicating the 35-55hz range and I don't see how that could possibly be the optimal setup. If you can download the manual for the Descent, I think you will see that Martin Logan suggests setting the sub to come in BELOW the lowest frequency range of your mains when you run them full range.

Also, why do you believe that you need an external crossover with the F113, but not the Descent?

Thanks for the answers, I am glad to see that I could run the 113 without the crossover. Cruz - I have a Martin Logan depth sub now in the system coming in at 35hz.

The reason I wanted to get the 113 is thatI have read it is very clean from 80 hz down. If I got the descent, I would run it in at 35hz. The descent i has the crossover built right in already.I only planned on buying 1 sub , even though JL Audio recommends 2 subs, 1 beside each speaker with an external crossover bring the subs in at 80hz.As mentioned , the main speakers will run cleaner.

However, that's a lot of money, 2 subs, crossover and extra wiring.I read a post on the ML owners forum where an ML dealer did mention that they preferred to bring in the descent at 35hz, but when it came to the JL Audio subs, he said they preferred the 80hz setting. He is both an ML and JL Audio dealer.

Cruz - the first 2 respondents to the thread weould also be duplicating 35 hz to 35hz and didn't seem to have any problems.

I prefer running a pair of f112's using 12db slope with lowpass set at 35hz. Mains running full range ( -3 db@ 25hz) without crossover. This way subs fill in from below and also add some texture to kickdrum ( 60 - 90hz) while tapering off before male vocals ( 90hz) begin. - Jim

I am running a jl113 @ 37hz with my GMA's and they blend exceedingly well.Cruz23 is right in questioning the use of a external crossover due to the loss in information and increased phase distortion.Image transparency is how I judge the crossover points, a loss means that the sub is too high and too low affects the blend as well. Hope this helps Dennis