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RE: Tweeter difference problem with 3.3Rs and more

First, use the tweeter protector strips whenever you are working on the mid/tweet panel or the tweeter. They are fragile, and you should not take chances to save a modicum of work.

The test of the tweeter is the playback of Cymbals - played in mono. see which sounds more extended. The one that sounds better extended is the one you should treat as reference at look at the one that sounds off.

The tweeters were obviously not replaced, as they have consecutive numbers. But one of them may have been repaired with a repair kit. Since later tweeters have a lower resistance and were installed with a series resistor (not the attenuation resistor), the louder one may be the one that had possibly been repaired and the resistor not put in place.

This is wrong:
In any case, you should measure the DC resistance of the mid/tweeter on both sides with your simple multimeter. If one of them reads about 4 ohms, then you have a disconnected tweeter there, if they are 1/2-2/3 ohms apart, then there has probably been a repair with a lower resistance foil and the 1 ohm resistor not put in.
Because: the tweeter is in series with a capacitor which is a disconnect for DC.


There can also be other issues, like the parallel inductor on the louder tweeter having broken one of its solder joints. Another possibility is the midrange low pass parallel cap having lost its solder joint on the louder one. Since you are going to take the socks off anyway, you will be able to see this by eye.

Re PLLXO high pass. I calculated out the components for your high pass filter at line level, I chose good quality components that should give you the best bang for the buck. The selection seemed better at Crickelwoods so I picked values there. The values are as follows:

C1 150 nF CPW150N Ansar Metalized polyprop

R1 2200 Ohms M2K2 metal film resistor

C2 40-44 nF composed of two (wire them in parallel to each other) 22 nF foil and film caps. CPP22N

These values correspond to poles at 470 Hz and 200 Hz which is sort of a spread out Bessel very close to the stock alignment.


Edits: 08/25/10
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