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Ok, thanks. IMHO, the best conductors (for sonic signal) are copper and silver.

Support has me answered: Those are brass jumper straps. Brass and Copper are not the same conductors, or i wrong ?

You are shure that are copper is? About self-made bridge i know, thanks. This is only right solution for non bi-wire connection, if a conductor non OFC contained.

Anybody knows from which material(conductor) is the bridge for not bi-wiring connection made?

I spelled it not exactly. The speakers have not approaches serial number. Support has me already answered: First speaker, 03070967 2003, 7 th week. 03470682 2003 47th week. Nothing was changed on this speaker during it's production run, 2003 to the end of 2005.

Thanks! Support has the same answered: First speaker, 03070967 2003, 7 th week. 03470682 2003 47th week. Nothing was changed on this speaker during it's production run, 2003 to the end of 2005.

I've gone a bought a pair RF-15. The speakers have not the same serial number (Serial numbers: RF15Ch-03070967 and RF15Ch-03470682). Is it possible to determine date of production per serial number? I will be in trouble, if the speakers may be different acoustik parameters have as a result of different production year and sequent ahother element base. Waiting for your answer.

I've today gone a bought a pair RF-15. The speakers have not the same serial number. Is it possible to determine date of production per serial number? I be in trouble, if the speakers different acoustik parameters have as a result of different production year and sequent ahother element base. Serial numbers: 03070967 and 03470682.