Coherent Source Service

Service and Restoration of THIEL Loudspeakers

Coherent Source Service maintains parts to service nearly every model produced between 1977 and 2014. The facility is owned and operated by the former service manager at THIEL and is the sole source of expertise on these legendary loudspeakers.

A Legacy Continues

Since 1977, tens of thousands of THIEL loudspeakers were built and sold into over 30 countries worldwide. With every one built, we endeavored to bring the joy of music into our clients homes. Though THIEL ceased producing time and phase coherent models in 2014, Coherent Source Service honors the incredible legacy of these products by continuing to keep them operating at the same level of excellence that compelled your purchase years ago.

Driver Replacement and Rebuilding

We can rebuild, repair, or replace nearly every driver used throughout the THIEL lineup with factory original parts or hand-selected replacements.

Crossover Repair

CSS stocks the same high quality parts specified in the original designs. We can diagnose and repair crossovers back to original specified performance

Grille Fabric Restretching

We use original factory fixtures to stretch new grille fabric over your existing frames to freshen the look of your speakers. We also stock new grille frames for certain models.

System Consultation

We are a great resource for information on how to get the best from your THIEL speakers whether you’re building a new system from scratch or upgrading your existing system. Call us for advice, we’re glad to share our knowledge.

Buy Restored THIELs

Occasionally, CSS will procure distressed THIELs for refurbishment and resale. Once fully restored to factory specs, we’ll offer these for sale here on our website. Contact us if you’re looking for a specific model.

Testing and Measurement

THIEL recognized that audio engineering was as much science as art. We possess extensive design documentation and golden samples for most models, so we can measure your speakers against the original design intent to verify their performance specifications.