MicBox: Mic to Speaker & PA

MicBox turns your phone into a portable microphone for a Bluetooth speaker, a wired PA or the phone's own loudspeaker. Three steps:
1. Connect a speaker: Bluetooth, a cable or the phone's speaker.
2. Run Quick setup.
3. Talk.

Use it at market stalls, sports coaching, outdoor events, community meetings or temple and church halls.

BUILT FOR OUTDOORS
• Outdoor Mode: one big switch sets a 120 Hz high-pass, +3 dB around 3 kHz for clarity, a limiter at −1 dBFS, a light gate and Impact Guard
• Wind Guard hears wind rumble below 150 Hz, slides the high-pass up to 250 Hz within 1 s and shows a wind icon, then returns 3 s after the wind stops
• Sunlight screen: high-contrast black and white with mint, three big buttons (Mic, Mute, Horn), large text, screen kept on
• Event Loop repeats an announcement such as entrance, parking or start time between background music. One message is free
• Speaker Rescue: if the Bluetooth speaker drops, the mic mutes at once and never blasts from the phone. A big alert shows, and the mic returns 1 s after the same speaker reconnects

QUICK SETUP AND RING-OUT
• Stay quiet for 3 seconds, then read one sentence aloud. MicBox picks gain, howl guard and noise gate, never above the safe level saved for this speaker
• Safe gain check raises the volume step by step until it rings, then marks the loudest safe level on the gain slider
• The "Talk now" shortcut on the app icon starts the mic with your last setup
• Setup code packs your settings into a short code or QR code, with no personal data. Save one scene, or up to 6 with Premium

BLUETOOTH OR PHONE SPEAKER
• A connected Bluetooth speaker is used automatically, with its name shown
• Keep speaker awake stops it dozing off and cutting your first word
• Input: phone mic, headset mic or a plug-in USB mic
• Bluetooth adds a short delay, often 0.1–0.3 s. The live delay chip shows about how many ms the current output adds; tap it to measure again. A cable is fastest

STOPS THE HOWL
• Anti-howl guard: Gentle, Balanced or Aggressive. It cuts a squealing tone and lowers the gain
• Howl help: if squeals keep coming back, a banner offers one-tap fixes
• The feedback margin gauge shows roughly how many dB you have left
• Noise gate keeps fan hum and crowd noise out between words

SOUNDBOARD, MUSIC AND RECORDING
• Soundboard: Applause, Correct! and Wrong buzzer while you talk
• Music bed: a song under your voice, with a mic and music balance
• Record what the speaker plays as a WAV file, then share or save it
• Hold to talk, slide up to lock; in pocket mode the volume keys are the mic button

SAFE FOR SPEAKERS AND EARS
• Soften sudden loud sounds is on from the start: door slams and claps are turned down fast
• Distortion warning with a one-tap "Lower 3 dB"
• Battery alerts at 20 % and 10 %
• Tip: stand beside or behind the speaker and start low

QUESTIONS
No sound? The "Why no sound?" check lists likely causes with one-tap fixes.
Does it record me? Only when you tap Record. Voice is processed on the phone, with no account and no upload. It works offline.
Is it free? Yes, with ads. Free sessions last 10 minutes; start a new one any time. Premium is monthly, yearly with a trial, or a one-time purchase. An optional short video unlocks Premium for 30 minutes.
Screen off? It keeps going, with Stop in the notification. A guide for your phone brand keeps it running in the background.

PREMIUM
• Outdoor Mode fine-tuning, 3 Wind Guard sensitivity levels, Event Loop message list
• Ringing tones from Safe gain check stay blocked
• Voice effects: Megaphone, Walkie-talkie, Robot, Alien
• Echo and reverb: Echo, Karaoke, Hall, Stadium
• Sirens and chimes: Wail, Yelp, Hi-lo, Door chime, Alarm beep
• 3-band EQ, pitch, auto-stop timer, full soundboard, music playlists, 6 scenes
• Recording up to 30 minutes (60 seconds free)
• Unlimited sessions without ads

MicBox needs Android 7.0 or later. Crash reports and usage stats never contain audio and can be switched off in Settings.