Store Audio: Speaker and Amplifier Calculation

How Store Audio Differs from Cafe

Store music goals:

• Mask silence — no awkward quietness
• Hold customers — right tempo extends shopping
• Announcements — "30% off..."
• Privacy at register — masks conversations

Customer walks; sound must be even across whole floor, no loud spots.

Calculation Formula

Step 1. Area S (m²) Step 2. Ceiling height h (m) Step 3. Speaker coverage radius Step 4. Count: N ≈ S / (1.5 × R²) Step 5. Amp power: P = N × W × 1.3

Example: 80 m² store, 3m ceiling, 6.5" → R=3m → N=6 speakers → 6×6×1.3=47W → use 60W amp.

Ready Solutions

• 30 m² (minimarket): 4× 4"/6W + DomAudio M130T 30W = ~1.6M UZS
• 60-80 m² (clothes/grocery): 6× 6.5"/6W + Amplifier 60 + BT receiver = ~3.5M
• 150-200 m² (small supermarket): 12× 6.5"/10W + Amplifier 240 + mic = ~7M
• 300-500 m²: 24 speakers + Amplifier 480 + zone mixer M7830T = ~14-18M

Zoning (Critical for 200+ m²)

Large store ≠ same music everywhere:

• Register — quiet
• Sales floor — standard
• Fitting rooms — background
• Warehouse — none

Solved with zone mixer-amp (M730T, M7830T).

Microphone

Desktop mic with PTT button → mic input on amp. Music auto-ducks when speaking.

Source

Bad to good:

1. Phone via Bluetooth ❌
2. BT receiver
3. Mini-PC with playlist ✓ — recommended
4. Pro scheduler player

Buy a Beelink/Chuwi mini-PC (~2-3M), install AIMP, 2-3 TB of music. No ads, no lag.

Tempo by Time

• Morning 80-90 BPM (calm)
• Afternoon 100-110 BPM (active)
• Evening louder, faster

+5-15% dwell time, +3-8% basket size (Milliman, 1982).

Don'ts

1. Corner-aimed speakers
2. One big speaker in center
3. Speaker directly over register (cashier hates it)
4. Hi-Fi on cheap amp (transformers blow)
5. No volume control in back office

Bottom Line

• Small store: DomAudio M130T + 4-6 S430T, 1.5-3.5M UZS
• Medium: Amplifier 60-240 + 6-12 S640T, 3.5-7M
• Large: Amplifier 240-480 + zone mixer + 12-24 speakers, 7-18M

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