---
product_id: 6664725
title: "PAC SNI-15 Speaker Level to Preamp Adapter"
brand: "pac"
price: "HK$185"
currency: HKD
in_stock: true
reviews_count: 10
category: "Pac"
url: https://www.desertcart.hk/products/6664725-pac-sni-15-speaker-level-to-preamp-adapter
store_origin: HK
region: Hong Kong
---

# 10:1 fixed conversion ratio Passive zero-noise isolation 20-30W adjustable output PAC SNI-15 Speaker Level to Preamp Adapter

**Brand:** pac
**Price:** HK$185
**Availability:** ✅ In Stock

## Summary

> 🔊 Elevate your stock sound—because your ride deserves pro-level audio.

## Quick Answers

- **What is this?** PAC SNI-15 Speaker Level to Preamp Adapter by pac
- **How much does it cost?** HK$185 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/6664725-pac-sni-15-speaker-level-to-preamp-adapter)

## Best For

- pac enthusiasts

## Why This Product

- Trusted pac brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Yet Robust:** Beefy build fits discreetly behind your dash, ready for serious bass.
- • **Universal Compatibility:** Works effortlessly with most factory-installed radios for instant upgrade.
- • **Seamless Amp Integration:** Add powerful amplification to your factory radio without rewiring headaches.
- • **Noise-Free Passive Design:** Isolation transformer eliminates hum and distortion—no power needed.
- • **Crystal-Clear Frequency Response:** Flat 20Hz-20kHz range ensures pristine sound fidelity for every track.

## Overview

The PAC SNI-15 Speaker Level to Preamp Adapter converts speaker outputs to RCA preamp signals with a fixed 10:1 ratio, delivering adjustable 2-30 watt output per channel. Featuring transformer isolation for zero added noise and a flat frequency response from 20Hz to 20kHz, it seamlessly integrates with most factory radios to enable amplifier upgrades without complex rewiring.

## Description

PAC Speaker Level To RCA Level Adapter, 10-20 Watts

Review: Works Perfectly - Installed in a 2008 Mazda3 with the stock radio to add a sub and it works flawlessly. Before hooking it up I ran a simple frequency response sweep and this thing is perfectly flat from 20-20,000 Hz just like it says. The input impedance is just about 20 ohms per channel, so you can connect it in parallel with the stock speakers and it will not put excessive extra load on your head unit. I wired it in parallel to the rear speakers and it worked out great. Uses an isolation transformer and is completely passive for zero added noise. No need to connect power to it like other units. There is no reason this type of device should need power. There is no hum or distortion being added by this device that I can tell. And the 10:1 ratio is fixed, which is probably perfect for most stock radios. My amp gain is set to about 2 o'clock and there's plenty of bass. Device is beefy and not super small, but still fit behind the radio without any issues. There are two brown ground wires that you do not need to connect. The instructions say to connect them to ground if you get no sound from your amp. I ohmed them out and they are connected to the ground on the RCA connectors. I'm not sure in what scenario you would have to hook those up, but leaving them unconnected worked fine for my setup. No noise, no hum, and now I've got some bass with my factory head unit. This device made it possible. Can easily recommend. 5 stars.
Review: Speaker level input for amp - This thing is rock solid and works as expected.

## Features

- To Add an Amplifier to a Factory Radio
- Linear for 20 - 20,000Hz
- Transformer Isolation Between Inputs and Outputs Keep Signal in Phase
- Adjustable from 2 Watts to 30 Watts per Channel with Fixed 10:1 Conversion
- Works with Most Factory Installed Radios

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000K50HJY |
| Best Sellers Rank | #192,068 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #782 in Power Converters |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (477) |
| Date First Available | October 28, 2006 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 3.84 ounces |
| Item model number | SNI-15 |
| Manufacturer | PAC |
| Other display features | Car Audio or Theater |
| Product Dimensions | 6 x 6 x 1 inches |

## Product Details

- **Brand:** PAC
- **Color:** Black
- **Input Voltage:** 12 Volts (DC)
- **Item dimensions L x W x H:** 6 x 6 x 1 inches
- **Output Voltage:** 12 Volts (DC)

## Images

![PAC SNI-15 Speaker Level to Preamp Adapter - Image 1](https://m.media-amazon.com/images/I/41ViyH4bIEL.jpg)
![PAC SNI-15 Speaker Level to Preamp Adapter - Image 2](https://m.media-amazon.com/images/I/71UQXrYWczL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works Perfectly
*by D***. on March 9, 2025*

Installed in a 2008 Mazda3 with the stock radio to add a sub and it works flawlessly. Before hooking it up I ran a simple frequency response sweep and this thing is perfectly flat from 20-20,000 Hz just like it says. The input impedance is just about 20 ohms per channel, so you can connect it in parallel with the stock speakers and it will not put excessive extra load on your head unit. I wired it in parallel to the rear speakers and it worked out great. Uses an isolation transformer and is completely passive for zero added noise. No need to connect power to it like other units. There is no reason this type of device should need power. There is no hum or distortion being added by this device that I can tell. And the 10:1 ratio is fixed, which is probably perfect for most stock radios. My amp gain is set to about 2 o'clock and there's plenty of bass. Device is beefy and not super small, but still fit behind the radio without any issues. There are two brown ground wires that you do not need to connect. The instructions say to connect them to ground if you get no sound from your amp. I ohmed them out and they are connected to the ground on the RCA connectors. I'm not sure in what scenario you would have to hook those up, but leaving them unconnected worked fine for my setup. No noise, no hum, and now I've got some bass with my factory head unit. This device made it possible. Can easily recommend. 5 stars.

### ⭐⭐⭐⭐⭐ Speaker level input for amp
*by V***. on June 3, 2025*

This thing is rock solid and works as expected.

### ⭐⭐⭐⭐⭐ The simple and easy one!
*by M***W on October 24, 2025*

I bought this to use on my home stereo since im using an amp but my stereo doesn't have a pre out for an amp I previously had a different one that required 12v power where this one does not however, it still needs to be grounded which there are two brown wires for which I didn't know that at first and when I first hooked it up there was a hum/buzzing coming out of the speakers read the instructions and then found out that it needed ground connection so I just decided to hook one of the brown wires to only one of the open speaker terminals on the receiver thinking it would pick up ground from the unit which it sure did! Sound went away completely soon as I did that and I've got no complaints it sounds great doesn't alter the sound quality at all.

## Frequently Bought Together

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-09*