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Radio Shack 40-1310 Horn Super Tweeter


Radio Shack 40-1310 Horn Super Tweeter

Note - the Radio Shack 40-1310 horn super tweeter has been discontinued and is no longer being produced. If you are looking for an external top-mount super tweeter, see our notes on the Fostex T90A Horn Super Tweeter . The Radio Shack 40-1310 is a high quality spun aluminum horn super tweeter that has been fairly well regarded. The tweeter comes in it's own pod and with a built-in, low quality (electrolytic capacitor and tiny iron core inductor) 2nd order crossover at 5kHz. The tweeter can be easily removed from the plastic pod to allow for direct mounting into an enclosure. The internal crossover can also be easily removed and upgraded.

Radio Shack 40-1310 Horn Super Tweeter Box

Radio Shack 40-1310 Horn Super Tweeter Box

Radio Shack 40-1310 Super Tweeters

Radio Shack 40-1310 Horn Super Tweeters

The Radio Shack 40-1310 super tweeter has very good and extended high frequency response and is well suited to add a little bit of top end air and sparkle. With a sensitivity of 96+ dB/1W/1m, the super tweeter can easy keep up with high sensitivity full-range drivers. The frequency response curve as measured by Radio Shack is shown below. The response curve is very flat between about 10kHz and 20kHz with good sensitivity (about 96 to 98dB).

Radio Shack 40-1310 Super Tweeter Frequency Response Curve

Radio Shack 40-1310 Super Tweeter Frequency Response Curve


Data Sheet - Radio Shack (Realistic) 40-1310 Horn Super Tweeter


Upgrades and Modifications - Radio Shack 40-1310 Super Tweeter

The picture below shows the horn lens removed from the tweeter pod. As you can see, the lens and throat of the horn is aluminum and well built. Aside, given the thickness of the front flange, it would be a good idea to countersink the horn into a baffle if you did not use the pod.

Radio Shack 40-1310 Horn Throat DIY Tweaks

Radio Shack 40-1310 Horn Super Tweeter

While I had the tweeter out of the pod, I felt it would not hurt to add some duct seal to the throat of the horn to deaden any potential vibration. It is also a good idea to use duct seal to dampen the light platic pod enclosure. I like using the super tweeter in the pod. With the tweeter pod, you can move the tweeter around to adjust the sound. The original screw terminals at the back of the super tweeter were not very usefull so they were removed and replaced with 3-way speaker binding posts.

Radio Shack 40-1310 Speaker Binding Posts

Speaker Binding Posts on Radio Shack 40-1310

Once the cross-over point is set to about 10 kHz or higher, the tweeter sounds pretty good. The new tweeter cross-over is a simple first order cross-over with 0.47 + 0.22 uF of capacitance. I use these tweeters to add some air and sparkle to the BD-Pipes. The tweeters are high sensitivity and and can be driven using a low power amplifier like the SE 50EH5 Tube Amplifier.

Cross Over for 40-1310 Horn Super Tweeter

Cross-Over for 40-1310 Horn Super Tweeter


Horn Super Tweeters

Links to more horn super tweeters.