Balance Control

If your goal is to simply correct the channel imbalance due to your hearing, and you don't want to either move your speakers or purchase a new preamp that has a balance control, you could try Rothwell Attenuators (link).  The cost for a pair of attenuators is around $106 USD (plus shipping), but maybe you could purchase just one. You simply place one of the attenuators in-line with the channel you want attenuated.  The default value is -10dB, but they come standard in several higher attenuation values.  If you want/need an attenuation value less than -10dB, then that would be a special order.  It seems a simple and inexpensive thing to try before buying a new preamp or adding DSP.  They also come up for sale in the used market occasionally.  You could post a wanted ad as I am sure there are some folks on this site or at USAM who have a forgotten pair stashed in a box somewhere (as I do).

@mitch2 

OP needs to balance 3 sources prior to entering the Hegel preamp with the built-in headphone jack. He would need 3 pairs of those.

OP just bought a Chase RLC-1 remote line controller (new, $45.) with 4 remote selectable inputs, vol, bal, mute, tone, and auto/progressive bass boost for very low volume listening.

I expect it will not only solve his needs, but he will also confirm that it does it’s job undetectably. I cannot count how many times I have yanked it out, and put it back, no one can tell it’s in line, or when alternately use via a tape loop.

@lanx0003  - i like this....pricier than what i ordered (the Chase) but very nice...might try this as well...if just to play with....very pretty, lol....and i like the design and options.

@elliottbnewcombjr  - might be a bit before i get to it as i never have the time and still a week before it gets here give or take - but yes, i will definitely report back here once up and running.

These will be the two options i will explore for now.  If i decide to change integrated amp for another or separates, I can still do so moving forward and owul dmake sure i have balance option.

@lanx0003 

That is a beauty, sadly it only has 1 in and two out; I wish it had two in, 1 out.

Currently OP uses a Lokius Equalizer with 2 in, one out, and a Phono Stage to Line, so, 2 IN works, but only 2 of 3 go thru the equalizer.

With the Chase, he gets 4 in, 2 out, then the equalizer for all, then all done prior to the internal headphone amp/jack.

@elliottbnewcombjr - I am not familiar with the Chase product and, while I hope it works out great for the OP, it does seem to add quite a bit of electronics for what is needed, sort of like adding a second preamp. The Rothwell attenuators can be placed between the preamp and power amp so the OP would only need one for whichever channel is to be attenuated.  One benefit with the Chase RLC-1 is that it will affect both channels the same.  However, when I used them years ago, I do not remember the Rothwells having much of an effect on the sonics of my system at that time so, hopefully, using them on one channel would not be noticeable.  If it were my system and I didn't want to add a new preamp, for the relatively low cost, I would try both and use whichever achieves my goals and affects the sound of my system the least. Carry on.