The NSB's--"No Stinkin' Badges"
Nicknamed by the infamous "Lefty" Carroll, because of their colorful history prior to Parts Express acquiring these drivers. A long and complicated process was employed to ensure that certain markings on these drivers were removed prior to their arrival at Parts Express-- very peculiar...
The NSB's are 4" drivers that offer excellent full-range performance in a small, fully-shielded package. These drivers are great for many different types of designs, from dipole surround speakers to center channels, and are even perfect for line arrays! Driver features: 3/4" V.C. on paper former, large flat spider, paper cone, rubber surround, and a paper dustcap. The textured PPM cone, rubber surround, large cast frame, and large shielded motor structure give this woofer a sense of quality that is not found on most small drivers.
Tips and Tricks for the NSB's
1. Use rope putty, modeling clay, or speaker sealing caulk on the basket to dampen the ringing of these poor things! Works well. It's pliable, seals very well, and can be taken apart easily if you need to remove your drivers. I've never heard a driver sound worse from having used this on the basket.
2. Making a small 1/4" or so hole in the dustcap will allow more and cleaner excursion with less air noise.
3. Coating the cone can help smooth out the response. Various coatings such as diluted "Tacky glue", diluted Elmer's glue, lacquers, water repellants, etc. seem to subjectively smooth out the response. Some experimentation is needed, along with measurements to confirm listening tests.
4. Making a trim ring works well to hide the nasty square frame of the NSB's. Not only will this improve the looks of the NSB, it can actually smooth out the sound by reducing diffraction. First, flush-mount the driver into the baffle by freehand routing a 1/16" recess around the frame. Now, the trim ring can be placed on top of the driver frame and baffle for a neat, clean looking job.
5. Cutting the hole for these drivers is a little tricky. There is not much room on the flat frame edge to seal the driver if you happen to cut a little large. When cutting the hole, cut it a little small and then round over the front edge lightly and you'll see that the driver seats well.
6. A good budget tweeter to use with the NSB's is the PE #269-702 tweeter. It offers good performance at a price that matches perfectly with the NSB!
There have been many projects conceived with the NSB drivers, unfortunately there is very little information available about many of them. Nevertheless, the pictures can still offer some great ideas!
If you have any project ideas, plans, drawings, or schematics for the NSB's, we would love to see them!
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