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#Cts piezo tweeter driver
If you want to use a 1005 or other 4khz driver with crossover and L-pad, put the resistor between the 8 ohm parallel resistor and the piezo tweeter.Learn more here: Piezoelectric Components and Devices
Whoever wrote those catalogs did not read, or completely misunderstood CTS's own paper on the subject.
#Cts piezo tweeter series
Putting 50 ohms in series with 1000 ohms is insignificant.Īgain, this resistor is not for protection of the tweeter, and will not pad the tweeter at all, regardless of what you read in some catalogs. It makes absolutely no difference in the audio range. I have done listening tests, shorting around the series resistor, and you just cannot tell, either in level or tone quality.
#Cts piezo tweeter drivers
The various 4000 hz drivers can use a series resistor to protect the amp, just as you see on your tweeter arrays.
This resistor is for protection of the amplifier, not the tweeter. To prevent this, the 1800 hz drivers and the Powerline series have an internal resistor in series with the driver. It is really fun at a gig to see smoke coming out of the PA tweeters. Or if the amp picks up RF, it can cook the tweeter. This extremely low impedance can cause some amplifiers to oscillate. And as frequency goes even higher, the impedance continues to drop. Up around 40 khz they drop as low as 4 ohms. In the audio range they have an impedance of about 1000 ohms. Piezo drivers act like a very small lossy capacitor. These had no internal components, just the driver mechanism.īTW, while the 1005 was, and still is very common, the 1001 is pretty rare. This group includes the KSN1005a (which are what you have) and the similar KSN1001a (same but rear mount), KSN1016 (2" x 5" horn), KSN1038, KSN1041 all had the same 4000 hz driver. The third group is comprised of various drivers with a low end rolloff of 4000 hz. In the second group are the various other 1800 hz drivers, KSN1025a (2" x 6" horn), and others, had an internal 22 ohm resistor, but no other protection. For making a 2-way with a large woofer, 12" or 15", this is ideal. It is very smooth, with some minor dips and humps that are far less than many well thought of drivers. This is a very large driver that goes down to 800 hz. These had a low end rolloff of 1800 hz.Īlso in this "Powerline" series was the KSN1188a, which replaced the older KSN1086 (which lacked the Powerline protection circuit). The KSN1165a, KSN1142a, and one more, a 2圆 horn that I don't remember the number, all have the built in "Powerline" protection circuit mentioned earlier. There are three "groups" of CTS/Motorola piezo drivers: These are hooked up parallel, with a resistor in series with each tweeter. I have NO idea how the manufacturer computed that impedance, but it is meaningless. The impedance was so high there was just no load on the amp. As far as the amp driving these was concerned, there was no load at all.
The built in protection circuit gives a "soft compression" effect at high levels and its effect is practically inaudible. Like the KSN1142a driver, the 1165 is rated for 100w, with protection up to 400w level. The KSN1165a has the same driver as the KSN1142a in CrackerKorean's horns, only the 1165a has its own small horn lens built on. These tweeters coming down smoothly to 1800 hz allows them to be used with many 10", 12", and even some 15" woofers in a two-way configuration with good results. If he wants, later on he can restore these cabinets with original woofers and tweeters. What was neat about using these for Macaltec's boxes, these tweeters fit the tweeter holes in his cabinets. Anyway, it has been my experience that using an L-pad will allow you to get a good tonal balance with these piezo tweeters. Either the KSN1165a's produce more than 92 db at 2.83v, or these woofers do not produce 92 db at one watt (PE's graph shows 87-88 db). These woofers are rated at 92 db SPL, as are the Daytons. I had to do the same with my Speakerlab woofers. Macaltec said he did have to dial down the L-pad to match the woofer, even though a look at the SPL's say they should match without. This same schematic could be used with other 6-8 ohm woofers by changing only the capacitor in the zobel network (computed from the woofer's Re and Le). This schematic is similar to the one I use in my living room now with a Speakerlab W1008b (10" woofer) in a 2 cft cabinet.
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