John,
I'm currently rebuilding a set of DQ-12s.? They needed the woofer foams replaced (I did that first).? I took a look at the crossovers and desided to rebuild them.? The ceramic resistors are rated at 5 watts, they're about 1 dollar each.? The sealant that encloses the resistors element was looking like it was breaking down - I figured I'd replace as they were fairly inexpensive.? Capacitors do degrade over time so I reached out to Dahlquist and bought the capacitor rebuilding kit.? It was pricey at $260 but the caps supplied are physically huge (I can send you pictures if you want).? The larger size of the caps posed some mounting issues that I was able to work out. One unit is assembled, i plan to finish assembling the second speaker this weekend - then I need to finish up changing the grill cloth.?
The resistors were within spec when I tested them.? My suggestion is to change the caps, and if the resistors are suspect in the least, replace them too.
I bought these speakers from a gentleman that had major issues since they were new.? One speaker kept blowing fuses.? As I tore down the cross-overs it became appearent that one speaker was wired wrong at the factory.? The 3A fuse was connected to the tweeter, the .75A fuse was connected to the woofer (DQ-12s support bi-amping).? It looks like the decal was actually applied upside down and the HF connection and fuse were labeled for the LF side and vica-versa.? The techs at Dehlquist were very helpful in helping me get this issue resolved.
That being said, these speakers are new to be so I won't have a before and after compairison to judge the affects of the cross-over rebuild, but the one speaker I finished last week sounds great.
Will
