Alpine PXE-X121-12EV
EV-Series 12-channel amplifier with digital signal processing — 25 watts RMS x 4 + 50 watts RMS x 6 + 100 watts RMS x 2
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Alpine PXE-X121-12EV 12-Channel Hi-Res DSP & Amplifier
Product overview:
The Alpine PXE-X121-12EV is a sophisticated, all-in-one audio solution designed for high-resolution sound processing and multi-channel amplification. Part of Alpine's EV-optimized lineup, this compact powerhouse combines a 12-channel Digital Sound Processor (DSP) with a built-in 12-channel amplifier. It is specifically engineered to integrate seamlessly into modern vehicles (especially EVs) where space is at a premium and power efficiency is critical.
Features
Seamless Integration
The PXE-X121-12EV features Matrix input summing, allowing it to merge complex factory signals into a clean, full-range output. With 12 channels of high-level inputs, optical/coaxial digital inputs, and HD Bluetooth streaming (via the included module), it fits into any system architecture. It essentially acts as the "brain" of your car audio, taking control of your factory head unit's signal and refining it for aftermarket speakers.
Professional-Grade Control
Tuning is handled via a user-friendly PC or Smartphone application. The interface allows you to manage a 31-band parametric or graphic EQ and precise crossovers (HPF, LPF, and Bandpass) for every single channel. This level of professional control ensures that each speaker in your car—from the dash tweeters to the rear fills—is playing exactly the frequencies it was designed for, with perfect phase alignment using all-pass filters.
Built-In 12-Channel Amp
This unit delivers a unique staggered power output to match the varying needs of a full system: 25W RMS x 4 + 50W RMS x 6 + 100W RMS x 2. This configuration is perfect for driving tweeters, mid-range speakers, and mid-bass drivers simultaneously. For those needing a bit more "thump," channels 11 and 12 can be run in parallel for a 2-Ohm load, providing extra flexibility for small subwoofers or high-power woofers.
Fine Tune Your Sound
The Hi-Res Audio playback (96kHz/24Bit) ensures that the "visual ambiance" of your music is crystal clear and lifelike. By utilizing the time correction features, you can "fine-tune" the arrival time of sound from each speaker to your ears, effectively moving the "soundstage" to the center of your dashboard. Its highly efficient design reduces heat and power draw, making it a "must-have" for electric vehicles where every watt counts.
Full Specs:
| Category | Specification |
| General | |
| Audio Quality | Hi-Res Audio Certified (96kHz/24Bit) |
| Configuration | 12-Channel Input / 12-Channel Output |
| Tuning | PC & Smartphone App (via Bluetooth or USB) |
| Inputs | 12 High Level, 2 RCA, Optical, Coaxial, USB DAC, HD BT |
| Outputs | 10 High Level, 2 RCA |
| Dimensions | Compact Chassis (EV-ready) |
| Amplifier Section | |
| Staggered Power | 25W x 4, 50W x 6, 100W x 2 (RMS) |
| Special Mode | Channels 11 & 12 parallelable for 2-Ohm load |
| Efficiency | High-efficiency Class D architecture |
| DSP Features | |
| Equalizer | 31-Band Parametric or Graphic |
| Filters | All-pass, HPF, LPF, Bandpass (per channel) |
| Warranty Information | |
| Parts/Labor Warranty | 1 Year Limited |
What Others Are Saying
Eddie was great - SDCS installed a new head unit in my 2019 4Runner. He was honest in his opinions regarding the options I was considering. Pricing was also good - he was able to reuse some of my existing installation kit so I saved a bit of $$.Installation was clean and fast and he took the time to walk through the features before I left. Highly recommend!!
I had a great time at this shop! The staff really knows their stuff and took the time to explain the different options without pressure. Installation was quick, clean and professional. Everything looks factory and sounds amazing. The prices were fair and customer service was above and beyond. I highly recommend this place if you're looking for quality car audio and excellent service.
Those guys are really professional! I had a new Alpine floating head unit installed in my 2008 Mercedes, and it feels like a brand-new car. The installation was super clean. At first, the sound wasn’t the same as the factory stereo, but Kevin tuned it to be just as good—if not better—without adding any new amps. They even used my factory GPS antenna so I don’t have extra wires hanging out. On top of that, they matched the online price. Big thanks to Kevin and Eddie—highly recommended!
Kevin was awesome, he took his time and explained everything to me. I went in initially for a dash cam install and then decided to get a sub and amp installed as well. Both turned out great and will be returning if I need more work done.
Came In not knowing what to expect when suddenly my stereo stopped working. Spoke with Kevin in the front and after a VERY fast diagnosing they discovered my wiring was incorrect. After only about 45 minutes total being in the store I was on my way to the beach with a working stereo again! Thank you so much SDCARSTEREO
Highly recommend Kevin and the team at San Diego Car Stereo for any issues with aftermarket stereos. I bought a car with an aftermarket stereo and AC unit that wasn’t working properly—specifically, the heat wasn’t functioning due to an improper setup. I had several people look at it with no luck, and even the dealership basically refused to help because it was an aftermarket install. I came to Kevin and his team over the holidays feeling pretty defeated, but he was confident he could get the heat working before I headed back to a Colorado winter. Sure enough, he got it done.
FAQ
Do products purchased from San Diego Car Stereo come with a warranty?
Yes, all products come with a 1-year manufacturer warranty unless otherwise stated. This covers any defects excluding physical damage.
Are these products brand new?
Yes, every product we sell is 100% brand new, unused, and comes in original manufacturer packaging unless clearly marked otherwise.
Do you offer installation services?
Yes, we offer professional installation services at both of our San Diego Car Stereo locations. Our expert technicians have over 50 years of combined experience to install all of your car, marine, or offroad audio needs. Stop by or give us a call to schedule an appointment to get a quote in person.