Expert Speaker Upgrades and repairs for Home Speakers, Professional and Audiophile Fall in Love with your Music all over again Rediscover the soul of every song as our masterful refinements transform your favorite tracks into immersive, crystal-clear moments of pure joy in your own living room. Start Your Audio Discovery OUR CORE SERVICES Before After Smart crossover changes can make your speakers sound like you just bought a much more expensive pair, without the huge expense. Plus, we’ll do the detailed work other upgrade companies won’t touch. UPGRADES REPAIR Expert repair at some of the BEST RATES IN THE COUNTRY. Need new surrounds, have crossover issues, or a blown tweeter? We’re here for you. RE-DESIGN Crossovers make the magic happen. We can improve speaker phasing, enhance imaging and soundstage, and smooth out driver interaction for greater refinement and tonal balance. Brands that we have worked on Acoustic Research, ADS, Advent, Altec Lansing, B&W, Bag End, Bose, Cerwin Vega, Definitive Technology, Dynaudio, Electro‑Voice, Infinity, JBL, KEF, Klipsch, Magnepan, MartinLogan, Mirage, Mission, Paradigm, Peavey, Polk Audio, Snell, Tannoy, Vandersteen, Wharfedale, and many more. Why Upgrade Your System? Speakers are the heart and soul of your system. No other component changes your sound as much as your speakers. Inside every upgrade: precision-matched components for better sound. Consult Our Experts Technical Excellence Engineer and Design We combine advanced modern engineering with decades of hands-on experience to deliver the best possible sonic performance for your speakers. HI-FI MODIFICATIONS Our team specializes in cost-effective upgrades that transform consumer-grade systems into audiophile-level performers without breaking the bank. RESTORATION & REPAIR We restore and upgrade vintage, current, and professional speakers to keep their original vibe while adding refinement, preserving technical integrity, and improving sonic clarity. Real Results from Real People Tim is a lifesaver. He expertly restored my worn 1970s speakers by salvaging the original drivers and upgrading the crossovers. They now sound incredibly clear with powerful bass. For honest and high-quality audio work, he is hands down the best in the business. Bill F. – St. Louis “My B&W Matrix 800s were missing their tweeters and crossovers. Just last year I found Tim, and he matched a great set of Morel tweeters and replicated the original crossovers with improvements for the tweeter and phasing. I couldn’t be happier.” Mike M. – Las Vegas, NV “I brought Tim my 55-year-old Pioneer CS-63DX speakers. He replaced all the capacitors with modern, long-lasting ones. I was surprised how affordable it was, and they definitely sound better than ever!” Dave H. – St. Peters, MO “Tim built me a custom audiophile speaker with high-sensitivity pro parts in 1986, and I loved them for years. When my 500-watt amplifier failed, it took the speakers with it. Now almost exactly 40 years later I brought Tim my cabinets back and he built another custom 15-inch, 3-way pure audiophile speaker. I can’t believe I own speakers of this quality.” Tony B. – St. Louis “My parents have a beautiful pair of JBL L100T speakers and I wanted them upgraded. Tim replaced the foam and did some updates—WOW, these things sound great!” Rabia H. – Los Angeles, CA "I've had the fortune of Tim teaching me high end through my audio journey. Whether a 2a3, EL34, 6550, Pass Labs, Technics Digital and many speakers, including his own 3-way MTM that mated so well with my CJ Premier 11a that I regret losing them. I can still hear the top end floating in the air to what seemed like forever. He has a passion. Rest assured you can trust him. He'll help you get the sound you never thought possible and always at a great price." Ed S. – Tampa, FL Get in Touch Speaker Upgrades LLC Technical Repair Request First Name* Last Name* Email Address* Phone Speaker Brand/ Model Number* Current Technical Issue* Driver Distortion Crossover Failure Cabinet Resonance Connectivity/Wiring Issue Upgrade Request Detailed Diagnostic Message* Submit Request Email info@speakerupgrades.com Location St. Charles, Missouri · 636-443-5233 Previous 01 upgrade infinity.jpg 02 Next 01 upgrade infinity.jpg 02

Explore Speaker University! Learn the art of sound with tutorials on crossover design, driver selection, and precision audio engineering. Technical Masterclass Speaker University Deep dive into the science of sound. Watch our expert-led tutorials on crossover design, driver selection, and cabinet optimization to master the art of precision audio engineering. Speaker Upgrades Introduction Learn the basics of modern speaker architecture and how each part contributes to overall performance. RECAPPING MY SPEAKERS A detailed look at the capacitor replacement process and the hurdles not commonly discussed for aging crossovers. Understanding Speaker Impedance A deep dive into how impedance curves affect your amplifier choice and how to stabilize those curves for quality performance. UNDERSTANDING SPEAKER SPECIFICATIONS How your speakers’ specs translate into real‑world sound and bass in different box types. HOW DOES SENSITIVITY WORK? A discussion of speaker parts, their sensitivity, and how they work together in the design and overall performance of your speakers. WHAT MAKES A WORLD CLASS SPEAKER? Explore the critical factors—from crossover design to driver quality—that distinguish high-end speakers from the rest. Subwoofer Knowledge Base Selecting woofer size, sealed or ported, one sub or many, and working with your room. CABINET DAMPING TECHNIQUES Learn how proper isolation and internal damping material can eliminate unwanted resonance in speaker cabinets. TESTING AND MEASUREMENTS An overview of the essential tools and software needed to measure frequency response and distortion in your setup. Schedule your upgrade Ready to transform your listening Experience? Hit "Book Now" to update your speakers to musical enjoyment. BOOK NOW