Speaker reconing can save you money over the purchase of new speakers. Having your speakers reconed you can bring your old or damaged speakers back to life. All speakers are fully tested after repair and a test certificate given.
- Just old age where the paper cone starts to get brittle and the outer corrugated ring just tears. The same applies to speakers that have a foam or rubber surround where, after time, the material perishes.
- Being heavily overdriven to the point that the cone is driven past its compliance and distorts the cone as the photographs below show. In some cases the cone can totally split. If your speaker is in this state then the failure is user error.
- Speech coil failure. This is where the winding has experienced dc voltage as a result of amplifier failure, although serious overload can cause the same problem. You will very often see this with hf and mid-range speakers. In this case it is essential for the amplifier to be thoroughly checked. Any dc offset greater than 40mV is suspect and needs looking into.
The photo shows the components in a typical recone kit. It consists of the cone, speech-coil and suspension assembly, a dust cone which stops dust and debris getting into the magnet assembly and an outer gasket ring that is glued to the circumference for it to bolt up to a baffle. All speakers today use a Ceramic Magnet. Back in the 1950’s as these magnets did not exist, this was made of an electro-magnet and acted as the choke in the DC rectification stages. If the magnet has been cracked, dislodged through impact or shock and the clearance is not symmetrical, then the speaker should be replaced.
Shows Cone breaking up