diff --git a/Carrier-PCB-and-BOM.md b/Carrier-PCB-and-BOM.md
index e3211c9..201c068 100644
--- a/Carrier-PCB-and-BOM.md
+++ b/Carrier-PCB-and-BOM.md
@@ -1,4 +1,4 @@
-# BikeAudio — Carrier PCB Design & BOM
+# Resound — Carrier PCB Design & BOM
 
 **Rev A (design-for-layout).** Target fab JLCPCB, 4-layer 1.6 mm. Module: ESP32-WROOM-32E (SMD castellated). Schematic-level netlist + layout plan + BOM — not Gerbers.
 
diff --git a/Hardware-Design-v0.1.md b/Hardware-Design-v0.1.md
index 2de4094..115b957 100644
--- a/Hardware-Design-v0.1.md
+++ b/Hardware-Design-v0.1.md
@@ -1,4 +1,4 @@
-# BikeAudio — Hardware Design v0.1 (stackable, battery-powered)
+# Resound — Hardware Design v0.1 (stackable, battery-powered)
 
 Consolidated design package from four research workstreams (power/battery, stack
 connector & addressing, carrier PCB & BOM, LED). This is a **design-for-layout
diff --git a/LED-and-Music-Sync.md b/LED-and-Music-Sync.md
index 13d62e9..83daa40 100644
--- a/LED-and-Music-Sync.md
+++ b/LED-and-Music-Sync.md
@@ -1,4 +1,4 @@
-# BikeAudio — Music-Reactive LED Subsystem (future) & Feasibility
+# Resound — Music-Reactive LED Subsystem (future) & Feasibility
 
 **Status: future/proposed.** TL;DR: feasible, but **use APA102/SK9822 (clock+data SPI), not WS2812**, **drive from the SINK** (or a dedicated ESP32-C3), **cap brightness ~25%** on a **switchable rail**. Done that way it costs little CPU and tolerable battery; the naive way (WS2812 on a broadcaster) will glitch the audio.
 
diff --git a/Power-and-Battery.md b/Power-and-Battery.md
index bce41c0..d306773 100644
--- a/Power-and-Battery.md
+++ b/Power-and-Battery.md
@@ -1,4 +1,4 @@
-# BikeAudio — Power & Battery Subsystem Design
+# Resound — Power & Battery Subsystem Design
 
 *Research/design doc. Current figures at the stated rail; assumptions called out. Sources at end.*
 
diff --git a/Small-Build.md b/Small-Build.md
index 1bf9fb6..797a906 100644
--- a/Small-Build.md
+++ b/Small-Build.md
@@ -1,4 +1,4 @@
-# BikeAudio — Small Build (the buildable v1 target)
+# Resound — Small Build (the buildable v1 target)
 
 The focused, buildable unit. Beast (6/12 broadcasters) is deferred — this drops
 all the hard scaling parts. See [Hardware Design v0.1] for the full picture and
diff --git a/Stack-Connector-and-Addressing.md b/Stack-Connector-and-Addressing.md
index 8158a54..ea41c7f 100644
--- a/Stack-Connector-and-Addressing.md
+++ b/Stack-Connector-and-Addressing.md
@@ -1,4 +1,4 @@
-# BikeAudio — Stack Connector, Bus & I2C Addressing
+# Resound — Stack Connector, Bus & I2C Addressing
 
 Physical/electrical interconnect for the stackable unit (1 SINK + N BROADCASTERS of identical ESP32-WROOM, + ESP32-S3 HUD). Audio 44.1k/16/stereo -> BCK = 1.4112 MHz.