Subwoofer without hi pass filter


Hi all,
I’ve been looking to add a subwoofer to my two channel system. The one I am looking at is a Rythmik L12. It does not have a hi pass filter output (only low level input) . It will be used with Spendor 3/5’s that go down to 75 hz. Is a high pass filter necessary with a subwoofer? If so, why no high pass filter on this and some other subs I have looked at ?
Thanks much for some input on this !
Don
donvito101

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