diff --git a/app/pages/classroom-introduction.vue b/app/pages/classroom-introduction.vue
index 3d0f809..fe5f7fb 100644
--- a/app/pages/classroom-introduction.vue
+++ b/app/pages/classroom-introduction.vue
@@ -511,7 +511,7 @@ function handleClassroomEntry() {
 }
 
 const voiceMode = ref<VoiceMode>('text')
-const radioLevel = ref(4)
+const radioLevel = ref(5)
 const hasCompletedRadioCheck = ref(false)
 const tourStarted = ref(false)
 const stageIndex = ref(0)
diff --git a/app/pages/classroom.vue b/app/pages/classroom.vue
index 924b1b1..e18411c 100644
--- a/app/pages/classroom.vue
+++ b/app/pages/classroom.vue
@@ -4035,7 +4035,7 @@ async function playAudioSource(source: CachedAudio, targetRate: number, token: n
 
   audioElement.value = null
 
-  const readability = Math.max(1, Math.min(5, cfg.value.radioLevel || 3))
+  const readability = Math.max(1, Math.min(5, cfg.value.radioLevel || 5))
   const mime = source.mime || 'audio/wav'
   const dataUrl = `data:${mime};base64,${source.base64}`
 
diff --git a/app/pages/pm.vue b/app/pages/pm.vue
index 2243821..bf80f91 100644
--- a/app/pages/pm.vue
+++ b/app/pages/pm.vue
@@ -1333,7 +1333,7 @@ const radioMode = ref<'atc' | 'intercom'>('atc')
 const isRecording = ref(false)
 const micPermission = ref(false)
 const swapAnimation = ref(false)
-const signalStrength = ref(4)
+const signalStrength = ref(5)
 const speechSpeed = ref(0.95)
 const radioCheckLoading = ref(false)
 const radioEffectsEnabled = ref(true)
diff --git a/server/models/LearnProfile.ts b/server/models/LearnProfile.ts
index 0aa3312..91e5705 100644
--- a/server/models/LearnProfile.ts
+++ b/server/models/LearnProfile.ts
@@ -19,7 +19,7 @@ const learnProfileSchema = new mongoose.Schema<LearnProfileDocument>(
     unlockedModules: { type: [String], default: () => [] },
     config: {
       tts: { type: Boolean, default: false },
-      radioLevel: { type: Number, default: 4, min: 1, max: 5 },
+      radioLevel: { type: Number, default: 5, min: 1, max: 5 },
       voice: { type: String, default: '', trim: true },
       audioChallenge: { type: Boolean, default: false },
       audioSpeed: { type: Number, default: 1, min: 0.5, max: 2 },
diff --git a/shared/learn/config.ts b/shared/learn/config.ts
index 3f4f2fe..68096e0 100644
--- a/shared/learn/config.ts
+++ b/shared/learn/config.ts
@@ -22,7 +22,7 @@ export interface LearnState {
 
 export const LEARN_CONFIG_DEFAULTS: LearnConfig = {
   tts: false,
-  radioLevel: 4,
+  radioLevel: 5,
   voice: '',
   audioChallenge: true,
   audioSpeed: 1,
diff --git a/shared/utils/radioEffects.ts b/shared/utils/radioEffects.ts
index 83ad3e7..c78c4db 100644
--- a/shared/utils/radioEffects.ts
+++ b/shared/utils/radioEffects.ts
@@ -50,22 +50,22 @@ const readabilityProfiles: Record<number, ReadabilityProfile> = {
     noise: { amplitude: 0.055, bandFrequency: 1950, bandQ: 1.2 }
   },
   4: {
-    eq: { highpass: 280, highpassQ: 0.65, lowpass: 3600, lowpassQ: 0.8, bandpass: { frequency: 2200, q: 1.15 } },
-    presence: { frequency: 2500, q: 1.25, gain: 2.2 },
-    distortions: [90],
-    tremolos: [{ depth: 0.06, speed: 2.9, type: 'sine' }],
-    gain: 0.97,
-    compressor: { threshold: -26, ratio: 9.5, attack: 0.0025, release: 0.2 },
-    noise: { amplitude: 0.024, bandFrequency: 2100, bandQ: 1.05 }
+    eq: { highpass: 250, highpassQ: 0.6, lowpass: 4200, lowpassQ: 0.78, bandpass: { frequency: 2400, q: 1.05 } },
+    presence: { frequency: 2700, q: 1.18, gain: 2.6 },
+    distortions: [60],
+    tremolos: [{ depth: 0.05, speed: 2.6, type: 'sine' }],
+    gain: 0.99,
+    compressor: { threshold: -25, ratio: 9, attack: 0.0024, release: 0.19 },
+    noise: { amplitude: 0.018, bandFrequency: 2150, bandQ: 1 }
   },
   5: {
-    eq: { highpass: 240, highpassQ: 0.6, lowpass: 4100, lowpassQ: 0.76, bandpass: { frequency: 2350, q: 1 } },
-    presence: { frequency: 2750, q: 1.1, gain: 2 },
-    distortions: [45],
-    tremolos: [{ depth: 0.03, speed: 2.1, type: 'sine' }],
-    gain: 1.02,
-    compressor: { threshold: -24, ratio: 8.5, attack: 0.0023, release: 0.17 },
-    noise: { amplitude: 0.012, bandFrequency: 2200, bandQ: 0.95 }
+    eq: { highpass: 220, highpassQ: 0.5, lowpass: 4800, lowpassQ: 0.72, bandpass: { frequency: 2550, q: 0.95 } },
+    presence: { frequency: 3000, q: 1.05, gain: 2.4 },
+    distortions: [35],
+    tremolos: [{ depth: 0.025, speed: 1.9, type: 'sine' }],
+    gain: 1.04,
+    compressor: { threshold: -23, ratio: 8, attack: 0.0022, release: 0.16 },
+    noise: { amplitude: 0.009, bandFrequency: 2250, bandQ: 0.9 }
   }
 }