I was obsessed with holography for years and found the following things helped: Bugle Boy 12au7s in the linestage of my preamp, a single-ended power amp, decent noise-cancelling cables in a kimber-style weave configuration and, most crucially, speaker placement. They need to be a couple of feet from the back wall, creating a sound reflection that arrives at your ears a millisecond late and which the brain interprets as depth. It's a bit of a parlour trick. The speakers moreover have to be the EXACT right distance apart, EXACT right distance from rear and side walls, with the EXACT right amount of toe-in, and you have to listen from the EXACT right near-field distance, including height. That part is inexpensive, time-consuming and fun. It's incredible the difference just 4mm can make. I'd also add that point source dual concentric or single driver speakers will help a great deal.
Having said all that, there's often a trade-off when you're chasing a single goal like holography. I no longer use the Bugle Boys because I much prefer the sound of RFTs, and went back to my old Mission 770 mkIVs from Kef dual concentrics for similar reasons. I'm on a budget though, so I'm sure it's possible to have both wonderful sound as well as extreme holography. The wealthier folks here with more high-end gear experience will be able to help you.
Having said all that, there's often a trade-off when you're chasing a single goal like holography. I no longer use the Bugle Boys because I much prefer the sound of RFTs, and went back to my old Mission 770 mkIVs from Kef dual concentrics for similar reasons. I'm on a budget though, so I'm sure it's possible to have both wonderful sound as well as extreme holography. The wealthier folks here with more high-end gear experience will be able to help you.