# 18W USB-PD Power Adapter For Louder and Amped
12V 1.5A 18W USB-C power adapter for TPA31XX and TAS58XX based devices
- **Seller:** [Sonocotta store](https://lectronz.com/stores/sonocotta), Warsaw, Mazowieckie, Poland
- **Price:** $10.00 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Power
- **Product page:** https://lectronz.com/products/-18w-power-adapter-for-louder-and-amped
## Options
**Socket type**
- EU (0 left)
- UK (3 left)
- US (3 left)
## Images
## Description
# What is it
This is a power adapter that is recommended to be used with the Louder and Amped series of ESP32 and Raspberry Pi-based devices, that have USB-PD capability. Originally, this power adapter is a quick charge phone charger, but after testing and comparing different models, I stopped at this one as it produces no hearable noise or hissing, good power figures, and stable work with D-class amps. After using it for more than 2 years, I can recommend it as a solid choice for audio.
# Features
- Color: White
- Compatible Boards: see below
- Input: 100-240V /50-60Hz
- Output: 12V 1.5A
- Adapter Power: 18W
- Plug Type: USB-C
- Certified: FCC, CE, UKCA
- Cable included: Yes (1m USB-C to USB-C)
# Compatibility list
## ESP32 Boards
- [Louder Esparagus](https://lectronz.com/products/louder-esparagus) (DUAL model)
- [Amped Esparagus](https://lectronz.com/products/amped-esparagus) (Any model)
## Raspberry boards
- [Louder Raspberry Pi Media Center](https://lectronz.com/products/louder-raspberry-media-center) (USB-PD model)
- [Amped Raspberry Pi Media Center](https://lectronz.com/products/amped-raspberry-media-center) (USB-PD model)
## Adapter Capability
- **Input Power (adapter):**
`12 V × 1.5 A = 18 W`
- **Usable Audio Output Power (80% efficiency):**
`18 W × 0.8 ≈ 14.4 W total`
This **14.4 W** is the total continuous power available for all channels combined.
## Key Formulas
- RMS Voltage:
`V_RMS = sqrt(P × R)`
- Output Current:
`I = sqrt(P / R)`
Where:
- `P` = power per speaker (W)
- `R` = speaker impedance (Ω)
## Single Speaker (Full Power Available)
If only **one speaker** is connected, it can use the full ~14.4 W:
| Impedance | Power | VRMS | Current |
|----------|------|----------------|---------|
| **2 Ω** | 14.4 W | ~5.4 V | ~2.7 A |
| **4 Ω** | 14.4 W | ~7.6 V | ~1.9 A |
| **6 Ω** | 14.4 W | ~9.3 V | ~1.5 A |
| **8 Ω** | 14.4 W | ~10.7 V | ~1.3 A |
## Two Speakers (Stereo Configuration)
With **two speakers**, power splits across channels:
- **~7.2 W per channel**
| Impedance | Power (per ch) | VRMS | Current (per ch) |
|----------|----------------|----------------|------------------|
| **2 Ω** | 7.2 W | ~3.8 V | ~1.9 A |
| **4 Ω** | 7.2 W | ~5.4 V | ~1.3 A |
| **6 Ω** | 7.2 W | ~6.6 V | ~1.1 A |
| **8 Ω** | 7.2 W | ~7.6 V | ~0.95 A |
## Practical Observations
- This adapter is suitable for:
- compact desktop speakers
- low-power stereo systems
- background music applications
- The available power is modest, so:
- high-volume playback may clip earlier
- bass-heavy content can stress the supply
- low-impedance speakers increase current demand quickly
- The **12 V rail** naturally limits maximum output swing, especially with:
- 6 Ω speakers
- 8 Ω speakers
## Final Notes
- Always leave some headroom to avoid clipping and distortion.
- Power adapters running continuously at maximum load may become hot.
- A larger power supply can improve transient response and bass performance, provided the amplifier and speakers support it safely.
## Shipping policy
Most orders are shipped the next business day morning. All shipments are tracked. Delivery time in the EU is 3-7 days, outside 2-3 weeks, depending on the distance. After 30 days, the package is considered lost - reach out for a refund or replacement.