AI-generated product photo — not official manufacturer imagery.
Estimated price (community-sourced)
About the Citadel 1.5
Theta Digital Citadel 1.5 is a high-end **mono power amplifier** pair from Theta Digital’s Citadel line. It is a fully balanced, differential, zero-feedback solid-state design built for reference-level playback, with single-ended and balanced inputs, massive output terminals, and an upgradable architecture. Retail pricing is listed at $25,000 for the pair in Audiogon’s Bluebook, while contemporary reviews also cited $15,800 per pair for the Citadel monoblocks; the Citadel 1.5 designation is associated with the same Citadel monoblock family and was introduced in 2008.
Specifications
Key Specifications
Full structured specifications are available to members.
Sign up to see full specificationsSee the full picture as a member
Create a free account to see where to buy, full structured specifications, similar components, and the systems that pair this with other gear.
Sign up free