Subwoofer xLr connection

Yes.  That's what they are for. 

I have read reviews of equipment that include xLr connectors and their circuit is single ended. I own a Graaf gm20 with balanced differential circuit topology. I am next going to purchase a preamplifier with balanced outputs. Audio GD is an option but of the two xLr outputs only one is in a balanced differential circuit the other is NOT. I have verified this with their representative. They can make one with both xlr’s set in the balanced differential circuit. This makes a difference to me because I can get the same preamplifier used, quicker, and at a discount possibly. The subs ar a pair of Martin Logan 1100x. I have read some articles stating that the real noise cancellation from xLr is only realized in balanced differential circuits. I have asked ML and their answer is that they are compatible. When I asked a second time rephrasing the question as in are the amps inside the subs balanced differential amplifiers the answer was that the question was already answered in the previous email, which… answer is not conclusive to me.

Single ended XLR inputs are "convenience" connectors to make it easier to pick and choose, but the wont have the same common mode noise rejection of a truly differential input.

It will perform just like an RCA connection in terms of noise rejection

The point is I doubt very much that the ML 1100x would have a balanced differential amplifier but, if anybody knows for sure and wanted to confirm either or, that would be nice.

I assume that the 1100XL is a discontinued model since a search on their website ends with no results? Regardless you can connect a balanced XLR output to an unbalanced XLR input. They will work, you just will not get the common mode noise rejection.

Is "balanced XLR input" printed above or below the connectors? 

Good question. They’re in the boxes but the manual says balanced xLr. It is not discontinued Dynamo 1100x the additional x is my mistake.

Now, the manual says that input does not work with the crossover its management being by the pre processor or receiver. So I would need extra bass management because I do not know of a preamplifier with bass management. Any suggestions?

It has to be a balanced xover with equalized to preserve the balanced circuit. I do not have the preamp yet but thinking of an Audio GD with both xLr balanced outputs. The other one going to a Graaf GM20 fully balanced power amp.

Wouldn’t it be nice if a preamp with bass management fully balanced unit existed, in stereo plus 2 subwoofer outputs.

The speakers are Cain and Cain single horn Ben with 8 inches drivers by Fostex, 8 inch constant or minimum impedance

Ohms sorry

The bottom processor link below may have preamp capabilities. You would have to contact them directly to verify.

Links one and two are to balanced analogue crossovers and links three and four are to crossovers with DSP processing.

https://www.jlaudio.com/products/cr-1-home-audio-subwoofer-crossovers-96020

https://dbxpro.com/en-US/product_families/crossovers

https://dbxpro.com/en-US/products/driverack-pa2

https://www.xta.co.uk/products/4-series/

@alanpiga If you are using a powered sub it has all the bass management you need, which is why preamps don't have it.

@atmasphere ​​@alanpiga - According to the manual, the 1000X assumes that line level and XLR inputs are going to come from the LFE output of a home theater processor and the internal crossover is bypassed. So some form of external bass management IS required if using this input. 

The speaker level inputs, on the other hand, do use the built in crossover, so you might just want to connect it this way. 

If you really want to use the line level input (either RCA or XLR), then you will need a preamp (or processor) that includes a subwoofer crossover. The ones that @audiorusty mentioned are a good place to start. I have a Danville Signal dspNexus that I've been playing with. This will handle what you are looking for, but is primarily designed for full active crossovers (i.e., replacing the passive crossovers in your speakers and using separate amps for each frequency band). It is quite powerful though. 

According to the manual, the 1000X assumes that line level and XLR inputs are going to come from the LFE output of a home theater processor and the internal crossover is bypassed. So some form of external bass management IS required if using this input. 

@jaytor Hm. Seems a real shame to have all that control thru a bluetooth app and then throw it away just because a hardwired input is used. Doesn't make sense. 

@jaytor Hm. Seems a real shame to have all that control thru a bluetooth app and then throw it away just because a hardwired input is used. Doesn't make sense. 

@atmasphere - Agreed. Poor design choice if you ask me.

I’d rather have choices. In this case because of noise that balanced circuits work better at eliminating. And, there is also the probability that all those apps are not that good. I don’t want to find myself with the constant need of trading equipment.