Stirling Broadcast have developed a kit for the repair of LS3/5as with blown bass/mid driver units. This kit is applicable to either the 11ohm or 15ohm versions of the LS3/5a and reuses your original cabinets, baffles and T27 tweeter units with new Monacor derive units and new crossover boards to restore your LS3/5as to their original sound.

As you may know it is extremely difficult to find good condition used Kef B110 SP1003 (15 ohm) drive units and it is virtually impossible to find type SP1228 (11 ohm) units. If you do find these drive units for sale they are usually very expensive and are also unlikely to be from original LS3/5as speakers - and therefore not compliant with the LS3/5a specification. In addition, whereas it is possible for a skilled repair technician to repair an SP1003 unit, repairing a broken SP1228 presents a much larger problem due to the PVC material that surrounds the driver.

After receiving numerous enquiries regarding LS3/5a repair we have invested in the development of a kit based on more modern and available drivers, namely the Monacor units that are often touted as a drop-in replacement for the B110. Although the Monacor drivers are an almost exact physical drop-in replacement (we have to extend the mounting holes) they are not an exact acoustic replacement and so a new crossover board has been used to tailor the response to match the desired LS3/5a response. As the T27 response is the same between the 11ohm and 15ohm versions, we need only provide a single version of the crossover.

All kits use one brand new matched-pair Monacor drive units with matching brand new crossovers to suit, plus special neoprene gaskets for the Monacor's and self adhesive neoprene gasket tape to reseal the baffles to the cabinets, so that the final result is the perfect original LS3/5a sound balance (technical and sonic performance).
We can supply just the parts kit or we can supply and fit the kit here at the Stirling factory with full testing, so that the loudspeakers will sound exactly as they did when new.

At present we can also supply a version of the kit with T27s, which must be fitted at Stirling Broadcast. This kit has STRICTLY LIMITED availablity as we only have a small supply of NOS T27s.

 It should also be noted that the current stock of crossover board are based on PCBs developed a while ago and also before the recent currency turmoil. When this stock is gone the kit will still be available, but the price is likely to rise as we do not know what the PCBs are likely to cost (the crossovers are already half the price of the kit).