A new crossover built with a Jantzen 15-gauge air core inductor, a 6.2uF polypropylene capacitor in parallel with one of 6.8uF value, a 1ohm 12 W Mills wire-wound resistor, heavy-duty binding posts and thicker hookup wire will run circles around the original New Advent crossover. It is my opinion that there is nothing worth salvaging in the original crossover design. The new sound will be bright on the high end, but without a boost in woofer performance, the job is only half done. This still leaves the original light-duty inductor and the 3-position switch, which is probably corroded inside. A typical overhaul involves replacing the electrolytic capacitors with polypropylene models, replacing the sand-cast resistors with the same type and maybe soldering on some thicker gauge wires. The original crossovers are of made of components which are of marginal quality. * The wires are very thin to the extent that they may actually be 22 gauge. NEW ADVENT A4, U4, A3 and U3 Crossover Specifications: The insulation on the "4" series crossover wires is thicker than that used on the "3" series. The components of the "3" series and the "4" series crossovers are identical, but the layout is different. In the New Advent series speakers, the A3 and U3 crossovers are identical and the A4 and U4 crossovers are identical. It's hard to imagine one cd sounding "excellent" and another sounding like it's coming from a "tin can," however, if this is the case. If the foam is good, could be they're fried.
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