Sabrina X Anyone Add Subwoofer(s)

First, all of my listening has been done at the dealer with the same amplifier that I use in my listening room.  My Wilson's are about one month out.  Since this speaker is an entry level product for Wilson, I was interested to see what happened to the impact and clarity of this speaker with a subwoofer.  My dealer sells the JL Audio Fathom 12" v2 and for another $5000 and tax I can upgrade, but I'm wondering why I've not read about using a subwoofer with the Sabrina X.  

I was going to buy from and have installed by the folks that are setting up the Wilson's.  That is why I posted prior to speaker installation.

I want to feed the subs setting the lower crossover point, but I don't intend on having the Wilson's fed by the subs upper crossover.  I would think that this would cause a bit of a peak at the lower end served by the Wilsons and the subs.

Lots of great information.  I now believe that two subs are best.  I also agree that I should wait to see if I need to go that far.  I'm really not looking for more base as much as more authority and clarity.  I really don't want a high pass filter.  I bought an integrated amp to simplify things and I assume that Wilson put a lot of work into the speaker's internal crossover.  I don't want to interfere with all of that, so I'm guessing that a 35-40hz crossover and a steep slope.

Smaller subs .. Do you have specific speakers in mind?

For example REL suggest their S/812 as a mono sub, or S/510 as a dual.  The smaller T9x doesn't have the low end extension needed.  My dealer carries the 12" Fathom v2, but at $5k it would be a single sub in my system.

Two E-Sub E112s seem like a better approach than one Fathom.  In theory it moves more air.  I would lose balanced inputs and automatic calibration.

I wish that I could use my Anthem ARC to measure the room.  I'll have to look into this.

What integrated did you get?  

McIntosh MA12000

If you don’t want to add a highpass crossover (hard with some integrated amps) I would pass on the subs. It will be a phasy mess without one. 

What subs have great electronic crossovers?

Sabrina X still back ordered, but managed to add a Technics 1200G turntable, Sutherland 20/20 & LPS and a pair of REL s/812s.  Working on power outlets, cable and acoustic room treatment.  I didn't want the expense of adding a high pass filter and I don't want to change anything about the Sabrina X.  I'll crossover the RELs in the 30-40 hz range..but we will see how this all fits.  Right now I'm using early 1990's $950 small monitors..

How many here have suggested listening to your new speakers first?

Excellent advice, but after listening to the MA12000 driving the Sabrina X, I decided that I did not want to alter what seemed to me to be an extraordinary speaker. They also had all but the last octave of base, so I looked for a fast subwoofer that was known for their high level inputs. Available funds made the S/812 my compromise choice. Moving into the reference series increased cost and limited availability.  I'm now curious to listen to the difference with the subs on vs off.

 By the way I am letting my pair of SabrinasX go, less than 1 year old. If anyone is interested

That begs the question, what speakers will take their place?

Great choice..let us know how your new toys workout in your system...

I’ve been listening to the Sabrina Xs and two s/812s. I tried many combinations and discovered that I must keep the crossover at 20-25 and REL volume low, or the Sabrina Xs lose some of their clarity. That said, the RELs improve many recordings. With some recordings, such as the Analog Productions 45RPM reissue of the Door’s L.A. Woman , they transform the music.