The soundstage consists of width and depth. That's why room treatments are being recommended. Using absorbtion and/or diffusion panels will help shape the soundstage and focus the image.
Regarding a preamp, the Schiit Freya may be worth an audition due to the use of the 6SN7 tube, plus a return policy.
Regarding a preamp, the Schiit Freya may be worth an audition due to the use of the 6SN7 tube, plus a return policy.