Fathom 113 no highpass filter

The f113s have a LP crossover but it can be bypassed.

Kal

Kal,Okay,yes it can be bypassed but should a person use a ext x-over with the subs even though I have passive x-overs in my 50a's.
I can see using an active X-over with speakers that don't have crossovers in them.

I would yes (to an external crosser) just for this reason. Why send that low bass power to your speakers? That would keep a little extra power for the mid bass on up in the mains. The purpose of internal speaker crossovers is to separate the needed frequencies for the different drivers.

That being said I personally do not use an external crossover yet for my sub. Someday when the funds permit I would love to get one for the reason I stated.

Just my opinion

IMO, the main reason to low pass the mains is that they are (usually) out in the room away from the walls. This means that cancellation caused by reflected energy will cause seriously ragged response in the long wavelengths (low frequencies). If the mains are low passed and the subs are against the wall, all bass is generated close to a wall, low frequency cancellations are greatly reduced, and bass response will probably be MUCH smoother.

OTOH, if your mains are also against the wall and/or they produce little to no low frequency info and/or you are able to effectively EQ the low frequency issues, then the decision to low pass becomes less compelling. You still might choose to do so, depending on the specifics of your set-up, but it's not as straightforward a calculation.

Just MHO.

Marty