# 65W USB-PD Power Adapter for Esparagus and Pro
20V 3.25A 65W USB-C power adapter for TPA31XX and TAS58XX based devices
- **Seller:** [Sonocotta store](https://lectronz.com/stores/sonocotta), Warsaw, Mazowieckie, Poland
- **Price:** $20.00 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Power
- **Product page:** https://lectronz.com/products/-65w-pd-power-adapter-for-louder-and-amped
## Options
**Socket type**
- EU (0 left)
- UK (0 left)
- US (1 left)
## Images
## Description
# What is it
This is a USB-PD-emabled power adapter that is recommended to be used with the Louder and Amped series of ESP32 and Raspberry Pi-based devices. Originally, this power adapter comes from ASUS/HP/Lenovo laptops, 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
# Features
- Color: Black
- Compatible Boards: see below
- Input: 100-240V /50-60Hz
- Output: 20V 3.25A, 15V 3A, 12V 3A, 9V 2A, 5V 2A
- Adapter Power: 65W
- Plug Tip Size: USB-C
- Certified: FCC, CE, UKCA
# Compatibility list
## ESP32 Boards
- [Louder-ESP32-Pro](https://lectronz.com/products/louder-esp32-pro) and [Louder ESP32 Mini](https://lectronz.com/products/louder-esp32-mini) (PD-enabled model)
- [Louder Esparagus](https://lectronz.com/products/louder-esparagus) (USB-PD and DUAL models)
- [Amped Esparagus](https://lectronz.com/products/amped-esparagus) (USB-PD and DUAL models)
## Raspberry boards
- [Louder Raspberry Pi Media Center](https://lectronz.com/products/louder-raspberry-media-center) (USB-PD and DUAL models)
- [Amped Raspberry Pi Media Center](https://lectronz.com/products/amped-raspberry-media-center) (USB-PD and DUAL models)
## Adapter Capability
- **Input Power (adapter):** 65 W
- **Usable Audio Output Power (80% efficiency):**
`65 W × 0.8 ≈ 52 W total`
This **52 W** is the total continuous power available for all audio 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 (PBTL mode)
If only **one speaker** is connected, it can use the full ~52 W:
| Impedance | Power | VRMS | Current |
|----------|------|----------------|---------|
| **2 Ω** | 52 W | ~10.2 V | ~5.1 A |
| **4 Ω** | 52 W | ~14.4 V | ~3.6 A |
| **6 Ω** | 52 W | ~17.7 V | ~3.0 A |
| **8 Ω** | 52 W | ~20.4 V ⚠️ | ~2.6 A |
⚠️ *Note:* At **8 Ω**, required voltage exceeds the 19 V supply, so actual power will be limited below 52 W.
## Two Speakers (Stereo Configuration)
With **two speakers**, power splits across channels:
- **~26 W per channel**
| Impedance | Power (per ch) | VRMS | Current (per ch) |
|----------|----------------|----------------|------------------|
| **2 Ω** | 26 W | ~7.2 V | ~3.6 A |
| **4 Ω** | 26 W | ~10.2 V | ~2.6 A |
| **6 Ω** | 26 W | ~12.5 V | ~2.1 A |
| **8 Ω** | 26 W | ~14.4 V | ~1.8 A |
## Practical Observations
- The **20 V supply voltage** becomes the limiting factor at higher impedances (especially **8 Ω**).
- Lower impedance speakers (**2–4 Ω**) allow higher current draw and better utilization of available power.
- The adapter is **well-matched for 2×20–30 W systems**, depending on speaker impedance.
- Real-world output will vary depending on:
- amplifier design (BTL, Class-D behavior)
- thermal limits
- power supply sag under load
## Final Notes
- Avoid significantly exceeding the voltage requirements of your speakers. For smaller speakers, use DAC/AMP gain settings to reduce the voltage swing over the speakers.
- This **20 V / 65 W adapter is a strong match for mid-power stereo systems**, but not intended for high-power (>50 W per channel) setups.
- Always leave **headroom (~10–20%)** to prevent clipping and distortion.
## 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.