diff --git a/mnemo_cards_admin/src/api/voices.ts b/mnemo_cards_admin/src/api/voices.ts
index c8a52d8..e78e8a5 100644
--- a/mnemo_cards_admin/src/api/voices.ts
+++ b/mnemo_cards_admin/src/api/voices.ts
@@ -23,7 +23,7 @@ export const voicesApi = {
   addCardVoice: async (
     cardId: string,
     voiceUrl: string,
-    language: string = 'es'
+    language: string = 'en'
   ): Promise<{ success: boolean; voice: VoiceDto }> => {
     const response = await adminApiClient.post(`/api/v2/admin/cards/${cardId}/voices`, {
       voiceUrl,
diff --git a/mnemo_cards_admin/src/components/ui/audio-upload.tsx b/mnemo_cards_admin/src/components/ui/audio-upload.tsx
index b16f36d..fa020c6 100644
--- a/mnemo_cards_admin/src/components/ui/audio-upload.tsx
+++ b/mnemo_cards_admin/src/components/ui/audio-upload.tsx
@@ -20,7 +20,7 @@ export function AudioUpload({
   label,
   value,
   onChange,
-  language = 'es',
+  language = 'en',
   onLanguageChange,
   accept = 'audio/*',
   maxSizeMB = 20, // Updated to match backend limit
@@ -173,18 +173,9 @@ export function AudioUpload({
           audioRef.current = null
         }
         
-        audio.onerror = (e: Event | string) => {
+        audio.onerror = (e) => {
           console.error('Audio playback error:', e)
-          let errorMessage = 'Failed to play audio. The file may be corrupted, in an unsupported format, or the URL may have expired.'
-          
-          if (e instanceof Event) {
-            const audioElement = e.target as HTMLAudioElement | null
-            if (audioElement?.error) {
-              errorMessage = `Failed to load audio: ${audioElement.error.message || 'Unknown error'}`
-            }
-          }
-          
-          alert(errorMessage)
+          alert('Failed to play audio. The file may be corrupted or in an unsupported format.')
           setIsPlaying(false)
           audioRef.current = null
         }
@@ -195,10 +186,7 @@ export function AudioUpload({
         
         audio.play().catch((error) => {
           console.error('Audio play error:', error)
-          const errorMessage = error instanceof Error 
-            ? error.message 
-            : 'Failed to play audio'
-          alert(`Failed to play audio: ${errorMessage}. Please check your browser audio settings.`)
+          alert('Failed to play audio. Please check your browser audio settings.')
           setIsPlaying(false)
           audioRef.current = null
         })
diff --git a/mnemo_cards_admin/src/pages/CardsPage.tsx b/mnemo_cards_admin/src/pages/CardsPage.tsx
index f5ecd11..2e516db 100644
--- a/mnemo_cards_admin/src/pages/CardsPage.tsx
+++ b/mnemo_cards_admin/src/pages/CardsPage.tsx
@@ -76,7 +76,7 @@ export default function CardsPage() {
     image: undefined as string | undefined,
     imageBack: undefined as string | undefined,
     voice: undefined as string | undefined,
-    voiceLanguage: 'es',
+    voiceLanguage: 'en',
   })
 
   const limit = 20
@@ -173,7 +173,7 @@ export default function CardsPage() {
       image: undefined,
       imageBack: undefined,
       voice: undefined,
-      voiceLanguage: 'es',
+      voiceLanguage: 'en',
     })
     setIsDialogOpen(true)
   }
@@ -191,7 +191,7 @@ export default function CardsPage() {
       image: card.image,
       imageBack: card.imageBack,
       voice: undefined,
-      voiceLanguage: 'es',
+      voiceLanguage: 'en',
     })
     setIsDialogOpen(true)
   }
@@ -230,7 +230,7 @@ export default function CardsPage() {
 
     const voice =
       formData.voice && formData.voice.trim()
-        ? { voiceUrl: formData.voice, language: formData.voiceLanguage || 'es' }
+        ? { voiceUrl: formData.voice, language: formData.voiceLanguage || 'en' }
         : undefined
 
     if (isUpdate) {