---
product_id: 70667571
title: "Zapco ST-4B 4-Channel 65 Watts x 4 RMS Full Range Class AB Amplifier"
brand: "zapco"
price: "$432.06"
currency: USD
in_stock: true
category: "Zapco"
url: https://www.desertcart.us/products/70667571-zapco-st-4b-4-channel-65-watts-x-4-rms
store_origin: US
region: United States of America
---

# Class-AB high current output 65W x 4 RMS power Stable 2Ω stereo & 4Ω bridged load Zapco ST-4B 4-Channel 65 Watts x 4 RMS Full Range Class AB Amplifier

**Brand:** zapco
**Price:** $432.06
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your drive — sound that commands attention, power that never quits.

## Quick Answers

- **What is this?** Zapco ST-4B 4-Channel 65 Watts x 4 RMS Full Range Class AB Amplifier by zapco
- **How much does it cost?** $432.06 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/70667571-zapco-st-4b-4-channel-65-watts-x-4-rms)

## Best For

- zapco enthusiasts

## Why This Product

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

## Key Features

- • **Compact Yet Mighty:** Sleek extruded aluminum chassis fits modern cars without sacrificing power or durability.
- • **Seamless Integration:** MOSFET power supply with RCA and OEM speaker-level inputs plus variable gain control for perfect tuning.
- • **Pro-Grade Signal Clarity:** Ultra-low distortion (<0.03% THD+N) and high SNR (>82dB) ensure crystal-clear audio fidelity.
- • **Engineered for Versatility:** Bridgeable design supports 2 to 6 channel setups, adapting to your custom audio needs.
- • **Power Your Ride with Precision:** Delivers a crisp 65 watts RMS across 4 channels for immersive, full-range sound.

## Overview

The Zapco ST-4B is a compact, 4-channel Class-AB amplifier delivering 65 watts RMS per channel with exceptional clarity and low distortion. Designed for versatile car audio setups, it supports stable operation at 2 ohms stereo or 4 ohms bridged loads, featuring MOSFET power supply, built-in crossovers, bass boost, and multiple input options. Its rugged aluminum chassis fits modern vehicles, making it a reliable, high-performance upgrade for audiophiles seeking professional-grade sound on the go.

## Description

The zapco ST-4B 4-channel bridgeable 2 to 6 channels, amp brings the sound quality and reliability that built the zapco legend; and an amplifier that everyone can afford. The extruded aluminum chassis is compact to fit today's smaller cars. The feature set provides versatility including built in crossovers, bass boost and preamp outputs. The ST-4B amplifier is misfit powered, uses class nab designed hi current bi-polar outputs, pass through preamp outs, and high voltage speaker level inputs. Th.D. + noise: 82Db, stereo separation: >45Db.

## Features

- 4-Channel, Class-AB Full Range Amplifier
- Stable into 4 ohms bridged or 2 ohms stereo load
- MOSFET power supply
- RCA and OEM speaker level input
- Variable Inputs Gain Control

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MQ6A92Y |
| Best Sellers Rank | #423,094 in Electronics ( See Top 100 in Electronics ) #966 in Car Multichannel Amplifiers |
| Brand Name | Zapco |
| Customer Reviews | 5.0 5.0 out of 5 stars (2) |
| Included Components | Mounting ScrewsOwner's Manual, Mounting Screws, Owner's Manual, ST-4B 4 Channels Class AB Amplifier |
| Item Dimensions | 12.2 x 2.05 x 7.17 inches |
| Item Type Name | ST-4B |
| Manufacturer | Zapco |
| Maximum Output Power | 260 watts |
| Model | ST-4B |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Output Power | 65 watts |
| Part Number | ST-4B |
| Specification Met | Unspecified Technical Specifications |
| Unit Count | 1 Count |
| Warranty Description | 1 Year Warranty |

## Product Details

- **Brand:** Zapco
- **Item dimensions L x W x H:** 12.2 x 2.05 x 7.17 inches
- **Manufacturer:** Zapco
- **Mounting Type:** Surface Mount
- **Number of Channels:** 4

## Images

![Zapco ST-4B 4-Channel 65 Watts x 4 RMS Full Range Class AB Amplifier - Image 1](https://m.media-amazon.com/images/I/51qGYjJpDeL.jpg)

---

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---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-10-11*