--- product_id: 1148054 title: "S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer" price: "668 kr" currency: DKK in_stock: true reviews_count: 13 url: https://www.desertcart.dk/products/1148054-s4eq-4-band-pre-amp-car-audio-stereo-equalizer store_origin: DK region: Denmark --- # Compact 4.25" x 6.8" x 1.1" design Gold-plated RCA outputs for pristine signal 4-band EQ ±18dB boost/cut S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer **Price:** 668 kr **Availability:** ✅ In Stock ## Summary > 🎵 Elevate your car audio game—because your playlist deserves the spotlight! ## Quick Answers - **What is this?** S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer - **How much does it cost?** 668 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/1148054-s4eq-4-band-pre-amp-car-audio-stereo-equalizer) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Dash-Friendly:** Sleek, space-saving design fits seamlessly into any car setup without dash modifications. - • **Premium Signal Integrity:** Gold-plated RCA outputs ensure crystal-clear audio transmission with minimal interference. - • **Amplify Your Ride’s Audio:** Pre-amp voltage boost cranks your amplifier’s output, delivering punchy bass and crisp highs that make every drive a concert. - • **Precision 4-Band Equalization:** Fine-tune bass, mids, and treble with ±18dB control for a truly personalized soundstage. - • **Dynamic Subwoofer Frequency Control:** Adjust crossover frequency on the fly from your dash—no amp resets needed, perfect for evolving playlists. ## Overview The Sound Storm Laboratories S4EQ is a compact 4-band pre-amp car audio equalizer featuring gold-plated RCA outputs and adjustable crossover frequency. It offers ±18dB boost/cut on four EQ bands (40Hz, 150Hz, 1kHz, 20kHz) and a variable subwoofer frequency control, enabling on-the-fly sound customization. Designed for easy dash integration, it enhances amplifier output for a richer, clearer audio experience favored by audiophiles upgrading classic or modern car sound systems. ## Description Sound Storm Laboratories S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer - Gold-Plated Front/Rear and Subwoofer Outputs Review: Problem installing rca's - Works fine BUT- I had same problem as others. One of the RCA plugs broke loose inside when I installed my cables, messing up the master volume. I've got the cables zip-tied at the rear which keeps the circuit board from shorting out. The RCA cables I used fit very tightly and were difficult to install. From now on when I install cables (to any unit) I will install them onto another device first, like an old CD player to make sure they are not too tight. You shouldn't have to use so much force that it breaks the unit you are installing them on. I don't think it was the fault of the EQ here. Everything about the unit seems to be of very good quality and the EQs performance is great. Clean and clear sound, and the preamp voltage rise really cranks up my amplifier's output. I really like this EQs variable sub frequency control. It allows you to change the crossover frequency right from the dash instead of resetting the amp. Works awesome-I can optimize hz values for different music on the fly. It makes a huge difference in dialing in the perfect sound, song to song. The rest of of this EQs performance is very good too. Master volume, sub volume and f/r fader-all good. The four band EQ boost/cut +/-18db provides a definitely noticeable difference when you dial the controls. Overall a very good unit. Would purchase again. The variable sub frequency control really gets it done-5 stars. Update Review 2-25-15 Purchased another S4EQ for another vehicle. Pre-installed my cables onto the old head unit before using them on the new EQ. No problems. Using the EQ on a sub only signal from my head unit then to an amp. EQ door speakers with a seven band Clarion. Works great. Love controlling volumes AND sub frequency (S4EQ) using three easy to reach dials. No having to read displays while I'm driving. SSL S4EQ-Spot on. Perfect for a great price. Would definitely use again. Review: Phone + BlueTooth Receiver + THIS Equalizer + Amplifer = killer sound system for older cars! - This little inexpensive EQ greatly improved the sound quality coming out of my phone/bluetooth receiver combination in my classic musclecar ride. For some 60's and 70's muscle cars, there aren't very many great options for head units that does not require cutting the dash. That's not a route I wanted to take, so I set out piecing together a sound system for my '74 Plymouth Duster after trying out and returning a RetroSound Redondo stereo. What I pieced together was this EQ along with an NVX bluetooth receiver (reviews aren't great on desertcart, but it's crystal clear) and an NVX 5 channel amplifier. Before I purchased this EQ, I was only using the NVX bluetooth reciever and amplifer along with my phone. The sound was very flat. The bass wasn't punchy and the highs not very crisp. So, I did some research and was convinced that I needed an EQ. If you're building setup like mine, then here's why you need and EQ like this one. What it does it separates the the lows and the mids/highs and boosts the signal to the amplifier. It also allows you to adjust the balance between the front and rear. Obviously, it also allows you to boost the signal for low, mid-bass, mids, and highs. After I added this EQ to my cobbled together sound system it made my music come ALIVE! The highs were nice and crips, the bass both punchy and boomy too. Mids are crystal clear. I listen to a variety of music from classic rock, metal, rap, 80's, ska, salsa, mambo, and more. This little thing definitely made it all come alive. So you might be wondering what speakers I'm running. In the front kick-panels, I'm running Pioneer 4"x6" speakers, in the rear package tray I'm running Kicker 6"x9"s and in the trunk I'm running a Kicker 10" subwoofer in a truck box since it fits the best. Best bang for your buck right here!! ## Features - EQ Band Center Frequencies: 40 Hz, 150 Hz, 1 kHz, 20 kHz - Dimensions: 4-1 / 4" (L) x 6-13 / 16" (W) x 1-1 / 8" (H) ## Technical Specifications | Specification | Value | |---------------|-------| | Best Sellers Rank | #40,268 in Electronics ( See Top 100 in Electronics ) #45 in Car Amplifier Equalizers | | Customer Reviews | 4.4 out of 5 stars 1,192 Reviews | ## Images ![S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer - Image 1](https://m.media-amazon.com/images/I/61GYhq-1SJL.jpg) ## Questions & Answers **Q: What can this do for my audio quality? Can it improve bass? I'm using the Sennheiser 598's. Thanks for your time!** A: Assuming that you are asking about the use of headphones in a car audio application, the SSL4EQ can raise the pre-amp line-out voltage from the FM/CD/HeadUnit to 7 volts. A typical head-unit alone outputs from 2 to 4 volts. The voltage rise achieved can help audio quality because a stronger signal will better reproduce weak audio frequencies and background music which may be difficult to isolate and amplify down the line.Signal voltage rise would also produce rises in volume overall, and a good clean volume rise in bass frequencies.This all depends on clean, quality audio signals from the start. Your device must also be able to handle audio line voltage rise as applied.Whether you are Aux Bluetooth or direct plugin I don't know, but if you can modify your line output using an EQ, at least you'll gain some useful rise in signal voltage until you reach distortion levels and you will have one more way to tune sound frequencies with the EQ.Hope that helps-you might also contact Sound Storm Laboratories tech, or for non-car audio (portable Windows media, USB devices and Android apps) try contacting the folks at Fiio for headphones amplification. Good luck.Pnuts. **Q: So the knob lights that it shows in the picture are not actually there right?** A: All these answers are right the light aluminates from the circle around the knob not on the knob itself. but I wil say that this is a great EQ I use it instead of a head unit with my phone... **Q: can I use a monoblock amp of 500 watts and one os this for the mids cus I got another mono amp for the subs** A: Yes I have two amps hooked to it. **Q: do the controls push in?** A: Only the button to change the color ....and the button to change to "aux" or "RCA" but the rest of them don't push in ## Customer Reviews ### ⭐⭐⭐⭐⭐ Problem installing rca's *by G***I on January 18, 2015* Works fine BUT- I had same problem as others. One of the RCA plugs broke loose inside when I installed my cables, messing up the master volume. I've got the cables zip-tied at the rear which keeps the circuit board from shorting out. The RCA cables I used fit very tightly and were difficult to install. From now on when I install cables (to any unit) I will install them onto another device first, like an old CD player to make sure they are not too tight. You shouldn't have to use so much force that it breaks the unit you are installing them on. I don't think it was the fault of the EQ here. Everything about the unit seems to be of very good quality and the EQs performance is great. Clean and clear sound, and the preamp voltage rise really cranks up my amplifier's output. I really like this EQs variable sub frequency control. It allows you to change the crossover frequency right from the dash instead of resetting the amp. Works awesome-I can optimize hz values for different music on the fly. It makes a huge difference in dialing in the perfect sound, song to song. The rest of of this EQs performance is very good too. Master volume, sub volume and f/r fader-all good. The four band EQ boost/cut +/-18db provides a definitely noticeable difference when you dial the controls. Overall a very good unit. Would purchase again. The variable sub frequency control really gets it done-5 stars. Update Review 2-25-15 Purchased another S4EQ for another vehicle. Pre-installed my cables onto the old head unit before using them on the new EQ. No problems. Using the EQ on a sub only signal from my head unit then to an amp. EQ door speakers with a seven band Clarion. Works great. Love controlling volumes AND sub frequency (S4EQ) using three easy to reach dials. No having to read displays while I'm driving. SSL S4EQ-Spot on. Perfect for a great price. Would definitely use again. ### ⭐⭐⭐⭐⭐ Phone + BlueTooth Receiver + THIS Equalizer + Amplifer = killer sound system for older cars! *by J***A on July 15, 2019* This little inexpensive EQ greatly improved the sound quality coming out of my phone/bluetooth receiver combination in my classic musclecar ride. For some 60's and 70's muscle cars, there aren't very many great options for head units that does not require cutting the dash. That's not a route I wanted to take, so I set out piecing together a sound system for my '74 Plymouth Duster after trying out and returning a RetroSound Redondo stereo. What I pieced together was this EQ along with an NVX bluetooth receiver (reviews aren't great on Amazon, but it's crystal clear) and an NVX 5 channel amplifier. Before I purchased this EQ, I was only using the NVX bluetooth reciever and amplifer along with my phone. The sound was very flat. The bass wasn't punchy and the highs not very crisp. So, I did some research and was convinced that I needed an EQ. If you're building setup like mine, then here's why you need and EQ like this one. What it does it separates the the lows and the mids/highs and boosts the signal to the amplifier. It also allows you to adjust the balance between the front and rear. Obviously, it also allows you to boost the signal for low, mid-bass, mids, and highs. After I added this EQ to my cobbled together sound system it made my music come ALIVE! The highs were nice and crips, the bass both punchy and boomy too. Mids are crystal clear. I listen to a variety of music from classic rock, metal, rap, 80's, ska, salsa, mambo, and more. This little thing definitely made it all come alive. So you might be wondering what speakers I'm running. In the front kick-panels, I'm running Pioneer 4"x6" speakers, in the rear package tray I'm running Kicker 6"x9"s and in the trunk I'm running a Kicker 10" subwoofer in a truck box since it fits the best. Best bang for your buck right here!! ### ⭐⭐⭐⭐ Ok EQ, once adjusted properly. *by E***. on January 10, 2024* The instructions are extremely vague as to how to make adjustments to clean up distortion and noise. Mine was turned wide open on the input adjustment settings. Once I turned that down it cleaned up quite a bit. I don't know if it will have ground loop and or alternator noise, but I have filters for those issues. For EQ they're designed to shape audio sounds for personal taste and room/cabin acoustic 's. If you use cheap speakers, your quality of sound will be far less than it could be. If your putting together a vehicle sound systems and need a EQ, do yourself a favor and buy good quality speakers. For the price point and quality of sound, Kenwood makes some of the best speakers available at any price. Hopefully I have been of some help with any questions about this product. 73 Earnest K5EWM. ## Frequently Bought Together - Sound Storm Laboratories S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer - Gold-Plated Front/Rear and Subwoofer Outputs - RECOIL RCI412 100% Oxygen Free Copper 12ft 4-Channel RCA Audio Cable, Twisted Pair with Noise Reduction - RCA Y-Adapter Splitter cable 2Pack,1 RCA Male to 2 RCA Female Stereo Audio Video Subwoofer Car Audio Cable Y Splitter Adapter Extension Cord for Home Theater, Hi-Fi System, Amplifier, Speaker-0.6 Feet --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/1148054-s4eq-4-band-pre-amp-car-audio-stereo-equalizer](https://www.desertcart.dk/products/1148054-s4eq-4-band-pre-amp-car-audio-stereo-equalizer) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-09-06*