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I actually had done quite a few 604 mods. But I finally did a time analysis on the job and decided it didn't make sense for me to continue doing them at the 603 price - and I also didn't want to raise the price to reflect the reality of the additional labor. In addition, I just don't have the time to spare for 604 mods because they seriously impact my weekly throughput and extend my lead time for other mods (which I don't won't to do) So for the time being - no 604 mods.
Here's a breakdown of what each aspect of the "Ultimate SDC Mod" does...
The Premium Electronics section - this extends bass response, lowerd midrange distortion and makes the top end sweeter and less gritty.
The capsule housing mod - this removes resonant and diffractive colorations due to the set-back of the diaphragm within the housing. The front of the housing is remachined to remove as much of the set back as possible (90%) and round the housing edge to eliminate sharp edge diffraction.
The body vent mod - enlarging the body vent area removes the nasty 8kHz peak and simultaneously adds some missing 16kHz air.
So it would be possible for me to do the capsule housing and body vent mods because that work is the same regardless of mic model. It is the electronics portion that becomes exceptionally difficult because of the double sided board with plated-thru holes and high component density. But at this point I'm not going to create an "ala carte" menu for these mods because the "Ultimate SDC" is really a great value and I try to get folks to recognize that.
So my apologies for halting the 604 mods for a while.
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