Subwoofer Advice

Now you have no crossover. So, you would take an output off your preamp and run it to the KEFs using the low pass filter in the KEFs.

Once you have the MiniDSP, you would set up the crossover in the MiniDSP and take a digital output to the Benchmark then balanced outputs from the benchmark to the KEFs.

Yes, the MiniDSP will improve the performance of the KEFs alone. You can always add subs later. Two 10" woofers is not going to project anything below 50 Hz with and degree of authority. With the KEFs you will have 4 purpose designed 9" drivers.

@mijostyn Thank you!
Due to space limitations what’s your thoughts on placing both the subwoofers on the same side wall, ninety degrees to the main speakers? Subs are none directional, correct? So, do you think this would be OK?

Not a good idea. The KEFs are quite small. The next best place would be in corners.

@big_greg You are right, this is a diversion, but @navyachts problem has been successfully addressed and his interest has been diverted to the subwoofer question. I am nowhere near the most intelligent person on this website, but I have been using subs with ESLs since 1978 and building subs since 1987. Experience being the teacher that it is I feel qualified to deal with his situation. ESLs are like the most beautiful girl you wish you never met. It is easy to make them sound terrible putting additional requirements on associated equipment, particularly amplifiers and subwoofer systems. 

Experience is a great teacher.  I recommend letting someone start out slow and easy and if they want to go down rabbit holes from there, good on them.

Let's get back to the original question:

"I don’t have a lot of room, maybe 16" or so square and I was wondering about a pair of SVS Micros. Do you think they would complement the 13As or do I need something bigger?"

The answer is "you won't know until you try".  Get a pair of the SVS Micros, try them out, and if they don't "complement" the speakers, send them back and try something bigger. 

What "additional strain" are they going to put on the amplifiers or subwoofer systems?  They have their own amplifiers and there is no existing subwoofer system.  Everything you're saying makes more $$$$$$$ than ¢¢¢¢¢¢¢.

@big_greg thanks for chiming in. Same question, how would I wire up the SVS Micros?

My power amp is on the same wall as my speakers, all the other components are on the side wall.

My preamp has these outlets:

1. Signal output is through two balanced XLR connectors and four unbalanced RCA connectors. The XLR pinout is identical to the input receptacles.

2. The Processor loop connectors permit the connection of an external audio device such as a surround sound processor or equalizer. Connect the output jacks to the input of the processor, and the output of the processor to the processor input jacks of the preamplifier.