--- product_id: 217278564 title: "Reference-3004A Reference Series 4-Channel, 75w X 4 Amplifier" brand: "infinity" price: "€ 557.77" currency: EUR in_stock: true reviews_count: 9 category: "Infinity" url: https://www.desertcart.es/products/217278564-reference-3004a-reference-series-4-channel-75w-x-4-amplifier store_origin: ES region: Spain --- # Compact footprint fits tight spaces 75W RMS x4 channels Variable electronic crossovers Reference-3004A Reference Series 4-Channel, 75w X 4 Amplifier **Brand:** infinity **Price:** € 557.77 **Availability:** βœ… In Stock ## Summary > 🎢 Elevate your ride’s sound game β€” don’t just listen, experience it! ## Quick Answers - **What is this?** Reference-3004A Reference Series 4-Channel, 75w X 4 Amplifier by infinity - **How much does it cost?** € 557.77 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/217278564-reference-3004a-reference-series-4-channel-75w-x-4-amplifier) ## Best For - infinity enthusiasts ## Why This Product - Trusted infinity brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Space-Savvy Design:** Engineered with a compact footprint to fit seamlessly in even the tightest vehicle spaces. - β€’ **Precision Audio Tuning:** Variable electronic crossovers let you customize high- and low-pass filters for perfect speaker or subwoofer performance. - β€’ **Powerful 4-Channel Output:** Delivers a clean 75 watts RMS to each speaker for immersive sound clarity. - β€’ **Seamless System Integration:** Supports both speaker-level and low-level inputs for flawless compatibility with factory or aftermarket stereos. - β€’ **Robust Protection & Reliability:** Built-in safeguards against shorts, temperature spikes, and voltage issues keep your system safe and sound. ## Overview The Infinity Reference-3004A is a compact yet powerful 4-channel car amplifier delivering 75 watts RMS per channel. Designed for easy integration with both factory and aftermarket systems, it features variable electronic crossovers for precise tuning and balanced differential inputs to minimize noise and distortion. Built-in protection circuits ensure durability, making it a reliable upgrade for audiophiles seeking clear, dynamic sound without sacrificing space. ## Description Infinity's Reference 3004A amplifier will add plenty of muscle to your music without breaking a sweat, and it'll look good doing it. This 4-channel powerhouse delivers 75 watts RMS to each of the front and rear speakers in your car. Into planning ahead? You could use this amp in 2-channel mode now to drive a couple subwoofers with 200 watts RMS each, then reassign it to your front and rear speakers when you get a bigger sub amp. Speaker-level inputs allow this amplifier to work in almost any system, even if you're keeping your car's factory radio. You can use the separate high- and low-pass filters on the front and rear channels to maximize the performance of your speakers or subs. Review: Sounds awesome. Pay attention to Gains and mounting - So I bought this to add to an aftermarket head unit that just wouldn't produce the sound I wanted. Glad I did. Fit and finish is awesome, and connections are straightforward. Instructions are written for those who already have an understanding of amps, but I don't hold it against because anyone can research necessary info, as I have done. You will need an amp wiring kit (8 ga. okay, I used 4 ga. for batt and ground) with 4X RCA cable connection, and you should use Speed Wire cable for simplicity. Edit 9/8/25: Amp still sounds fantastic through my little Polk 75W speakers. This is a great amp for those who want great sound and don't want to break the windows out of your car/truck. For those interested, use RUSH 2112 as a starting point. You will hear things you have never heard before. I'm thinking of putting the Infinity sticker next to Sabian and Pearl on my vehicle, I am that impressed. (I'll use this word again) "Fantastic" sound. Clear, not kidding. If you are on the fence, buy this unit. It takes a bit of work, but it will be worth it in the end; you will not be disappointed. Hope this helps some. First time listening through this amp out of the box was fantastic, with clear treble and bass. So I dialed up a notch and decided to follow Crutchfield and others' advice to adjust gain according to the input from head unit. What I found using multi-meter was that the more I adjusted gain, the larger the voltage disparity between outputs, even from left to right front, and L to R rear. My Polk DB572 Speakers are 75W RMS, matching the amp, so SQ. RT of 75x4 = 17.32v per channel (speaker). The recommendation is to adjust gain at 3/4 output (for me, 30). This did not work well for me; voltage readings were all over the place, it sounded terrible, and I was getting feedback through speakers while accelerating, though I used a solid 4 ga. ground to a great connection. I tried everything to make this sound better with gain adjustments, then I decided to just turn the gains back down to 0. Sounds awesome again, and I have been hearing things like bass licks in music I had NEVER heard before, at even less than 3/4 output from head unit (<30 volume). To be fair, it probably has something to do with my cheap head unit, so your results may be better. Bottom line, this amp is fantastic out of the box, great looking and even better sounding. Very happy so far. Be wary of the gain/crossover adjusts. I set Crossovers to 3/4 and everything sounds great. Gains I left at zero. I used a paint marker to mark switch adjustments so that I knew where they were (no indicators); I recommend anyone adjusting to do the same. Another suggestion to those trying this amp: not sure of the cooling of this since heat sink is barely discernible from the rest of the case. I positioned mine so there is plenty of airflow under and behind. Harman recommends you position the heat sink (side opposite connections) upward for heat dissipation for vertical installation; mine is installed horizontally with much space around. So far I'm very impressed with the look and sound quality of this amp paired with a cheap head unit; sounds fantastic. Hope this helps some. Review: Great amp - I put this amp on four infinity kappa 6.5 speakers and my truck sounds so good. It makes a lot of power and very high quality for the money ## Features - Infinity Reference amplifiers have been engineered with a compact footprint to fit in more vehicles even if available space is limited. - Speaker-level and low-level inputs allow the Reference 3004A to integrate with both aftermarket and factory car stereo systems. - Unlike many amplifiers available at similar prices, the Infinity Reference 3004A features variable electronic crossovers circuits allowing for precise system tuning and performance. - The Reference 3004A has been engineered using Balanced Differential Inputs to ensure low noise and distortion even at high output levels. This also makes it far less susceptible to line induced radiated engine noise. - On-board circuitry protects the Reference 3004A from shorts, high-temperature, overvoltage and undervoltage. An LED indicator is provided to let you know when one of these conditions exists. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08D5LXHJ2 | | Best Sellers Rank | #64,359 in Electronics ( See Top 100 in Electronics ) #130 in Car Multichannel Amplifiers | | Brand Name | Infinity | | Customer Reviews | 4.3 4.3 out of 5 stars (27) | | Global Trade Identification Number | 00050667375485 | | Included Components | One Reference 3004A four channel amplifier,4 Bare wire-to-RCA adapters, Four 30A ATO fuses (2 installed, 2 spare), Owner's Manual, 4 Mounting screws (M4 x 53mm), 2 Infinity decals, 1 logo badge | | Item Dimensions | 8.94 x 14.96 x 4.45 inches | | Item Type Name | Car Amplifier | | Item Weight | 6 Pounds | | Manufacturer | Infinity | | Model | Reference-3004A | | Mounting Type | Freestanding | | Number of Channels | 4 | | Output Power | 75 Watts | | Package Type Name | box | | Specification Met | Cea-2006 | | Supply Current | 13.8 Amps | | UPC | 050667375492 050667375485 | | Unit Count | 1.0 Count | | Voltage | 16 Volts (DC) | | Warranty Description | 1-Year Manufacturer Warranty | ## Product Details - **Brand:** Infinity - **Item dimensions L x W x H:** 8.94 x 14.96 x 4.45 inches - **Manufacturer:** Infinity - **Mounting Type:** Freestanding - **Voltage:** 16 Volts (DC) ## Images ![Reference-3004A Reference Series 4-Channel, 75w X 4 Amplifier - Image 1](https://m.media-amazon.com/images/I/61CgY74iiHL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Sounds awesome. Pay attention to Gains and mounting *by A***K on May 22, 2025* So I bought this to add to an aftermarket head unit that just wouldn't produce the sound I wanted. Glad I did. Fit and finish is awesome, and connections are straightforward. Instructions are written for those who already have an understanding of amps, but I don't hold it against because anyone can research necessary info, as I have done. You will need an amp wiring kit (8 ga. okay, I used 4 ga. for batt and ground) with 4X RCA cable connection, and you should use Speed Wire cable for simplicity. Edit 9/8/25: Amp still sounds fantastic through my little Polk 75W speakers. This is a great amp for those who want great sound and don't want to break the windows out of your car/truck. For those interested, use RUSH 2112 as a starting point. You will hear things you have never heard before. I'm thinking of putting the Infinity sticker next to Sabian and Pearl on my vehicle, I am that impressed. (I'll use this word again) "Fantastic" sound. Clear, not kidding. If you are on the fence, buy this unit. It takes a bit of work, but it will be worth it in the end; you will not be disappointed. Hope this helps some. First time listening through this amp out of the box was fantastic, with clear treble and bass. So I dialed up a notch and decided to follow Crutchfield and others' advice to adjust gain according to the input from head unit. What I found using multi-meter was that the more I adjusted gain, the larger the voltage disparity between outputs, even from left to right front, and L to R rear. My Polk DB572 Speakers are 75W RMS, matching the amp, so SQ. RT of 75x4 = 17.32v per channel (speaker). The recommendation is to adjust gain at 3/4 output (for me, 30). This did not work well for me; voltage readings were all over the place, it sounded terrible, and I was getting feedback through speakers while accelerating, though I used a solid 4 ga. ground to a great connection. I tried everything to make this sound better with gain adjustments, then I decided to just turn the gains back down to 0. Sounds awesome again, and I have been hearing things like bass licks in music I had NEVER heard before, at even less than 3/4 output from head unit (<30 volume). To be fair, it probably has something to do with my cheap head unit, so your results may be better. Bottom line, this amp is fantastic out of the box, great looking and even better sounding. Very happy so far. Be wary of the gain/crossover adjusts. I set Crossovers to 3/4 and everything sounds great. Gains I left at zero. I used a paint marker to mark switch adjustments so that I knew where they were (no indicators); I recommend anyone adjusting to do the same. Another suggestion to those trying this amp: not sure of the cooling of this since heat sink is barely discernible from the rest of the case. I positioned mine so there is plenty of airflow under and behind. Harman recommends you position the heat sink (side opposite connections) upward for heat dissipation for vertical installation; mine is installed horizontally with much space around. So far I'm very impressed with the look and sound quality of this amp paired with a cheap head unit; sounds fantastic. Hope this helps some. ### ⭐⭐⭐⭐⭐ Great amp *by C***N on October 28, 2024* I put this amp on four infinity kappa 6.5 speakers and my truck sounds so good. It makes a lot of power and very high quality for the money ### ⭐⭐⭐⭐⭐ Sounds great ! It gave my Stereo what it needed to sound amazing. *by M***W on March 25, 2023* I really like this amplifier. It give my speakers the kick it needed. I bought new speakers that are suitable for the wattage. It really sounds crisp and clear. I also installed a new head unit. Alpine iLx-507. Worlds apart from my factory radio and speakers. Btw, I just ordered another Infinity 3004a 4-channel amplifier, for my other car. I am impressed by not only the volume but more so the sound quality this amp makes. ## Frequently Bought Together - Infinity Reference-3004A Reference Series 4-Channel, 75w X 4 Amplifier - Infinity REF307F Reference Series 3.5" Extreme-Performance Automotive coaxial Speakers - Infinity Reference REF-9633IX 6x9 3-Way Coaxial Speakers (300 WATTS 100 RMS) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.es/products/217278564-reference-3004a-reference-series-4-channel-75w-x-4-amplifier](https://www.desertcart.es/products/217278564-reference-3004a-reference-series-4-channel-75w-x-4-amplifier) --- *Product available on Desertcart Spain* *Store origin: ES* *Last updated: 2026-05-27*