![]() The heralded Dahlquist DQ-10 used a KSN-1005 piezo for the highest frequencies and essentially the Large Advent woofer for the lowest. Vintage Motorola Piezo Tweeter Speaker 85x85mm Working from Carlsbro A-115. 388 sold (2) Two Aftermarket Piezo Replacement Tweeters 4 3/8' Motorola KSN1165A. ![]() Piezo Replacement Tweeters for Motorola KSN1001A. An application of rope caulk to the back and sides of the horn helps to deaden any plastic sound. Vintage Motorola Powerline Horn Speaker Used. Remove the three screws from the back of the piezoī.Coat the paper cone with one coat of damarĬ.Remove ‘pooling’ of damar with a tissueĤ. Application of damar varnish on the piezo’s cone element is said to add refinement to the sound and almost completely reduce the fatiging sibilance:Ī. 0.47 uf capacitor wired in series (Hovland, $1.50 each from Madisound) I assume this only allows frequencies above 15,000 Hz (based on 12dB filter parameters) go to the piezo tweeter?ģ. 8 ohm/20 watt resistor across the piezo terminals (Radio Shack part # 271-120, $1.49 each) What affect does this resistor have? Does it make the piezo an appear to the system as an 8 ohm driver?Ģ. Although no crossover is needed and this driver supposedly does not significantly affect the impedence of the speaker it is wired to, I found the following ‘crossover’ circuit and modifications to the driver that is said to eliminate its "spitty and lispy" fatiguing harshness:ġ. ![]() I thought I might try to extend the high frequency of the Large Advent by adding a Radio Shack Piezo Tweeter 40-1218 or the Motorola/CTS KSN-1005 (4kHz-27kHz). The New Large Advent has a reported frequency response of 33Hz to 17,000Hz +/- 3dB. ![]()
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