diff --git a/stacks/dia/.env.example b/stacks/dia/.env.example
index 102d2bf..291d690 100644
--- a/stacks/dia/.env.example
+++ b/stacks/dia/.env.example
@@ -1,56 +1,41 @@
-# Dia / Dia2 stack tunables. Copy to `.env` on irv-ml1 before deploying.
+# Dia2 stack tunables. Copy to `.env` on irv-ml1 before deploying.
+# Two fixed-model instances (dia2-2b, dia2-1b) from the dia2-capable image.
 
-# ── build pin ────────────────────────────────────────────────────────
-# SHA of devnen/Dia-TTS-Server. Use the FULL 40-char SHA — docker
-# buildx's git source resolver doesn't accept short hashes. `main`
-# works but is NOT reproducible; pin a SHA before you rely on this in
-# anger (same churn lesson as chatterbox, whose `main` once broke on an
-# upstream path restructure). Latest commits:
-#   https://github.com/devnen/Dia-TTS-Server/commits/main
-DIA_SHA=main
-
-# Local image tag — bump when you change build context to force a
-# fresh layer build.
-DIA_TAG=v1
+# ── image ────────────────────────────────────────────────────────────
+# Built in two stages (see README + dia2-image/Dockerfile):
+#   upstream devnen wrapper            -> local/dia:v1
+#   + dia2 package & its missing deps  -> local/dia:v2   (this tag)
+# Bump when you change the derived build context.
+DIA_TAG=v2
 
 # ── network ──────────────────────────────────────────────────────────
-# Host port. Container listens on 8003 internally.
-# Reserved on irv-ml1: 8188 ComfyUI, 8190 CosyVoice, 8191 Qwen3-TTS,
-# 8192 IndexTTS-2, 8193 Kokoro, 8194 VibeVoice, 8195 Fish-S2,
-# 8196 Chatterbox, 8197 Voxtral, 8198 Kyutai, 8199 Zonos, 8765 Parakeet.
-# 8200 picked here.
-DIA_PORT=8200
+# Each container listens on 8003 internally. Reserved on irv-ml1:
+# 8188 ComfyUI, 8190 CosyVoice, 8191 Qwen3-TTS, 8192 IndexTTS-2,
+# 8193 Kokoro, 8194 VibeVoice, 8195 Fish-S2, 8196 Chatterbox,
+# 8197 Voxtral, 8198 Kyutai, 8199 Zonos(gradio), 8200 Dia2-2B,
+# 8201 csm, 8202 Dia2-1B, 8203 zonos-api, 8765 Parakeet.
+DIA2_2B_PORT=8200
+DIA2_1B_PORT=8202
 
-# Bind address. 0.0.0.0 exposes on all interfaces (incl. WG tunnel
+# Bind address. 0.0.0.0 exposes on all interfaces (incl. the WG tunnel
 # interface 10.100.79.3); 127.0.0.1 restricts to local-only.
 DIA_BIND=0.0.0.0
 
 # ── runtime / GPU ────────────────────────────────────────────────────
-# Devices visible inside the container. "0" pins to the RTX 3090
-# (24 GB) — Dia at BF16 (~7 GB) fits comfortably. Use "1" for the
-# A6000 if you'd rather keep the 3090 free.
-DIA_GPU_DEVICES=0
+# Both Dia2 models are small enough to share the RTX 3090 (device 0).
+# Set either to "1" to move it to the A6000 if the 3090 gets crowded.
+DIA2_2B_GPU=0
+DIA2_1B_GPU=0
 
-# Model selection is config.yaml-driven in the wrapper (model.repo_id),
-# not a plain env var. Default in-image model is Dia 1.6B. To pin a
-# different default, mount a host config.yaml (see commented volume in
-# compose.yaml) setting one of:
-#   nari-labs/Dia-1.6B   — original, single/dual-speaker dialogue
-#   Dia2-1B              — streaming, lower latency
-#   Dia2-2B              — highest quality
-# Or just switch live from the Web UI at http://<host>:8200/ .
+# ── per-instance config (pins model.repo_id) ─────────────────────────
+# conf-convention path (lkraven-owned, no sudo). Each file is a full
+# config.yaml with model.repo_id set to that instance's Dia2 model.
+DIA2_2B_CONFIG=/opt/docker/conf/dia2-2b/config.yaml
+DIA2_1B_CONFIG=/opt/docker/conf/dia2-1b/config.yaml
 
-# ── persistent storage on the host ───────────────────────────────────
-# Reference audio dir for voice cloning / speaker prompts. Drop short
-# reference WAVs here; the wrapper picks them up by filename. Included
-# in restic (cloned voices need the original reference to recreate).
+# ── persistent storage on the host (shared by both instances) ────────
+# Reference audio for cloning / speaker prompts (included in restic).
 DIA_REFERENCE_DIR=/worktank/dia/reference_audio
-
-# HuggingFace cache — Dia/Dia2 checkpoints land here on first start.
-# Bind-mounted so they survive container recreate. Excluded from restic
-# (regenerable from HF).
+# HuggingFace cache — Dia2 checkpoints land here on first start. Shared
+# cache is fine (keyed per repo). Excluded from restic (regenerable).
 DIA_CACHE_DIR=/worktank/dia/cache
-
-# Optional: host config.yaml to pin a default model + generation
-# defaults. Leave commented in compose.yaml unless you want it.
-# DIA_CONFIG=/worktank/dia/config.yaml
diff --git a/stacks/dia/compose.yaml b/stacks/dia/compose.yaml
index f14a625..e08a9da 100644
--- a/stacks/dia/compose.yaml
+++ b/stacks/dia/compose.yaml
@@ -1,67 +1,81 @@
-# Dia / Dia2 (Nari Labs' dialogue-focused TTS) served via
-# devnen/Dia-TTS-Server — the same OpenAI-compat wrapper author as our
-# chatterbox stack, with multi-model support for the Dia 2 family
-# (Dia 1.6B / Dia2-1B / Dia2-2B), switchable from the Web UI.
+# Dia2 (Nari Labs' dialogue-focused TTS) served via devnen/Dia-TTS-Server.
 #
-# Why this stack exists alongside the other TTS:
-#   * DIALOGUE scenes with nonverbal cues — Dia generates multi-speaker
-#     turn-taking in a single pass with inline [S1]/[S2] speaker tags
-#     and nonverbals like (laughs), (coughs), (sighs). Purpose-built for
-#     the character-dialogue case skaldsong's storytelling hits, which
-#     the single-speaker engines (Fish/Index/Chatterbox) don't own.
-#   * Dia2 (released 2025-11-19) adds realtime streaming + a 2B
-#     high-quality checkpoint.
-#   * Apache-2.0 model weights; MIT wrapper; OpenAI-compat
-#     /v1/audio/speech so skaldsong can target it by base-URL.
-#   * ~7 GB VRAM at BF16 SafeTensors.
+# Dialogue scenes none of the other bench TTS own cleanly: multi-speaker
+# turn-taking in one pass with inline [S1]/[S2] tags + nonverbals
+# (laughs)/(coughs)/(sighs). OpenAI-compat POST /v1/audio/speech.
 #
-# Image is built locally from the upstream wrapper via docker buildx
-# git-context (no source vendored on the host) — same pattern as
-# chatterbox/fish-s2.
+# This stack runs TWO fixed-model instances from the dia2-capable image
+# (local/dia:v2 — built in two stages: the upstream devnen wrapper image
+# local/dia:v1, then dia2-image/Dockerfile layers in the dia2 package +
+# its missing runtime deps; see README). The wrapper serves whatever model
+# is loaded and IGNORES per-request model selection, so the only way to
+# offer multiple Dia2 models to asset-engine as real choices is one fixed
+# instance per model — which is exactly this:
+#   * dia2-2b — Dia2 2B, highest quality   (:8200, the primary dia port)
+#   * dia2-1b — Dia2 1B, streaming/faster   (:8202)
+# Each pins ONE model via its mounted config.yaml. Legacy Dia 1.6B retired
+# (operator decision 2026-05-31).
 #
 # All tunables live in .env — edit that, not this file.
 
 services:
-  dia:
+  dia2-2b:
     image: local/dia:${DIA_TAG}
-    build:
-      # Single Dockerfile at repo root; GPU via NVIDIA Container Toolkit.
-      context: https://github.com/devnen/Dia-TTS-Server.git#${DIA_SHA}
-      dockerfile: Dockerfile
-    container_name: dia
+    container_name: dia2-2b
     restart: unless-stopped
     runtime: nvidia
     ports:
-      - "${DIA_BIND:-0.0.0.0}:${DIA_PORT}:8003"
+      - "${DIA_BIND:-0.0.0.0}:${DIA2_2B_PORT}:8003"
     environment:
-      - NVIDIA_VISIBLE_DEVICES=${DIA_GPU_DEVICES:-0}
+      - NVIDIA_VISIBLE_DEVICES=${DIA2_2B_GPU:-0}
       - NVIDIA_DRIVER_CAPABILITIES=compute,utility
-      # Speeds the first-boot HF download of the checkpoint.
       - HF_HUB_ENABLE_HF_TRANSFER=1
       - HF_HOME=/app/hf_cache
     volumes:
       - ${DIA_REFERENCE_DIR}:/app/reference_audio
       - ${DIA_CACHE_DIR}:/app/hf_cache
-      # Model selection lives in the wrapper's config.yaml (model.repo_id):
-      # mount a host config to pin a default of Dia2-1B / Dia2-2B instead
-      # of the in-image default (Dia 1.6B). Otherwise switch live in the
-      # Web UI (selection may not survive a container recreate).
-      # - ${DIA_CONFIG}:/app/config.yaml
+      # Pins model.repo_id=nari-labs/Dia2-2B (highest quality).
+      - ${DIA2_2B_CONFIG}:/app/config.yaml
     healthcheck:
-      # devnen's Dia server exposes GET /health (liveness) plus
-      # /api/model-status (download/load progress) and /api/model-info.
-      # /health is the simple liveness probe; start_period covers the
-      # first-boot model pull. python urllib (image has no curl), bound
-      # to 127.0.0.1 (uvicorn is IPv4-only).
       test: ["CMD-SHELL", "python3 -c \"import urllib.request,sys; urllib.request.urlopen('http://127.0.0.1:8003/health', timeout=5); sys.exit(0)\""]
       interval: 30s
       timeout: 10s
       retries: 3
-      # First boot pulls the checkpoint (~6-10 GB) — generous deadline.
+      # First boot pulls the Dia2-2B checkpoint — generous deadline.
       start_period: 600s
     labels:
       - homepage.group=AI Systems
-      - homepage.name=Dia / Dia2
+      - homepage.name=Dia2 2B (HQ)
       - homepage.icon=mdi-account-voice
-      - homepage.description=Dialogue TTS — multi-speaker turn-taking + nonverbals (irv-ml1)
-      - homepage.href=http://10.100.79.3:${DIA_PORT}
+      - homepage.description=Dialogue TTS — Dia2 2B, highest quality (irv-ml1)
+      - homepage.href=http://10.100.79.3:${DIA2_2B_PORT}
+
+  dia2-1b:
+    image: local/dia:${DIA_TAG}
+    container_name: dia2-1b
+    restart: unless-stopped
+    runtime: nvidia
+    ports:
+      - "${DIA_BIND:-0.0.0.0}:${DIA2_1B_PORT}:8003"
+    environment:
+      - NVIDIA_VISIBLE_DEVICES=${DIA2_1B_GPU:-0}
+      - NVIDIA_DRIVER_CAPABILITIES=compute,utility
+      - HF_HUB_ENABLE_HF_TRANSFER=1
+      - HF_HOME=/app/hf_cache
+    volumes:
+      - ${DIA_REFERENCE_DIR}:/app/reference_audio
+      - ${DIA_CACHE_DIR}:/app/hf_cache
+      # Pins model.repo_id=nari-labs/Dia2-1B (streaming, lower latency).
+      - ${DIA2_1B_CONFIG}:/app/config.yaml
+    healthcheck:
+      test: ["CMD-SHELL", "python3 -c \"import urllib.request,sys; urllib.request.urlopen('http://127.0.0.1:8003/health', timeout=5); sys.exit(0)\""]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 600s
+    labels:
+      - homepage.group=AI Systems
+      - homepage.name=Dia2 1B (Streaming)
+      - homepage.icon=mdi-account-voice
+      - homepage.description=Dialogue TTS — Dia2 1B, streaming/faster (irv-ml1)
+      - homepage.href=http://10.100.79.3:${DIA2_1B_PORT}
diff --git a/stacks/dia/dia2-image/Dockerfile b/stacks/dia/dia2-image/Dockerfile
new file mode 100644
index 0000000..cbe24fd
--- /dev/null
+++ b/stacks/dia/dia2-image/Dockerfile
@@ -0,0 +1,31 @@
+# dia2-capable image, layered on the upstream devnen wrapper image
+# (local/dia:<base>, which ships the wrapper + the dia1 package only).
+#
+# Why this exists: the upstream image does NOT bundle the dia2 package or
+# its runtime deps. The wrapper tries to `git clone nari-labs/dia2 &&
+# pip install` it at RUNTIME on first Dia2 load — which fails (no `git`,
+# and would be lost on recreate). We provision Dia2 at build time instead.
+#
+# Two upstream packaging quirks, both handled below:
+#   1. dia2's pyproject build backend yields an empty "UNKNOWN" wheel under
+#      the base image's old setuptools (59.6 < the required 70) and rejects
+#      editable installs. dia2 is pure-python (packages=["dia2"]), so we
+#      copy the package straight into site-packages — the wrapper only needs
+#      `from dia2 import ...` to succeed, not pip-tracked metadata.
+#   2. A bare `pip install dia2_src` would also drag torch>=2.8 + pin
+#      safetensors==0.5.3. The base ALREADY satisfies dia2 (torch 2.12,
+#      numpy 2.2, safetensors 0.7) — so we install ONLY the genuinely
+#      missing runtime deps and leave the heavy/pinned stack untouched.
+#      (transformers/sphn/whisper-timestamped verified as the minimal set
+#      that makes the wrapper's `from dia2 import Dia2, ...` import succeed.)
+ARG DIA_BASE=local/dia:v1
+FROM ${DIA_BASE}
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends git \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN git clone --depth 1 https://github.com/nari-labs/dia2.git /opt/dia2_src \
+    && cp -r /opt/dia2_src/dia2 "$(python3 -c 'import site; print(site.getsitepackages()[0])')/" \
+    && rm -rf /opt/dia2_src \
+    && pip install --no-cache-dir "transformers>=4.55.3" "sphn>=0.2.0" "whisper-timestamped>=1.14.2"