(DOF kit is a reverse/universally compatible upgrade that comes standard in all new production Blumenstein speakers)

The biggest little improvement.

Available for any legacy Blumenstein or Cain & Cain Audio speakers

Included in the DOF kit is all of the specially developed internal parts that are now outfitted standard inside the model year 2018 and forward Blumenstein speaker cabinets* - Coral Acoustic Wave Breakers, (in-house designed, hand-made acoustic damping compounds) and Floating Driver mounting hardware system (new screws, washers, and isolation washers) as well as our newer style low durometer urethane vibration damping cabinet feet. I include new gaskets, new internal wires (unless you are also purchasing our new terminal plates) and finally, a Diamagnetic Noise Reduction technique kit.

After installation is complete, the sound is going to subtly, but pleasantly come alive into an even more powerful focus than you ever thought possible from your legacy Blumenstein speakers.

This suite of upgrade parts is the culmination of all the careful considerations that I have developed as minor upgrades over years of trial and error in pursuit of tailoring and tuning the acoustic and electric properties of each of these internal parts to produce a clearer, more powerful voice from the same cabinets and drivers.

There are now options for prior Thrasher and Triton 8" Full range and Orca Sub/Dungeness, or any prior series of 6.5" or 5 1/4” subwoofers as well.

*The DOF upgrade kit is compatible with all prior bracing styles dating back to 2006. However, the DOF kit does not (and cannot) include the new solid wood internal braces that underpins the architecture of model year 2018 and forward.

Instead of bogging you down with written-only instructions, once you’ve gotten the kit and aquired the tools needed for your specific model year, we can just hop on the phone, facetime, or zoom etc and I’ll help you get the upgrades done in a jiffy. I will help you determine the tools needed and can loan you some of my tools if needed - just please remember to send them back to me!

Need a custom DOF kit for another legacy Blumenstein speaker that you don’t see in the drop down menu? Or have you got another DIY single driver project that needs some help in the damping department? Just drop me an email and I’ll see if I can make you a kit that might help.

I wouldn’t even try to claim that my speaker tuning techniques are universally compatible to all types of speakers. I’ve owned many sizes and brands of full range drivers, subwoofers, and so many types of cabinets, even some horns, before landing on my current product line that is more geared towards minimalists (who still want maximum sound quality). I’m good at interviewing people and helping them acheive their sound quality goals. However, my expertise / parts set is definitely more limited to the full range / wide band type speakers.

NRT with Quartz DMS - Noise Reduction technique using Quartz Diamagnetic Metasurfaces

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